Answer:
The theoretical yield of copper is approximately 1.65 grams.
Explanation:
Relative atomic mass data from a modern periodic table:
Al: 26.982;Cu: 63.546;Cl: 35.45.What's the balanced equation for the reaction between [tex]\text{Al}[/tex] and [tex]\text{CuCl}_2[/tex]?As a metal, aluminum is more reactive than copper. Aluminum will reduce the [tex]\text{Cu}^{2+}[/tex] ion in [tex]\text{CuCl}_2\;(aq)[/tex] to [tex]\text{Cu}\;(s)[/tex]. This process will form a positive aluminum ion, which will then combine with chloride ions in the solution. What will be the charge on each aluminum ion? Aluminum is in IUPAC Group 13 of the periodic table. Each aluminum atom contains three valence electrons. As a main group metal in the p-block, each atom will lose all three of its valence electrons to form [tex]\text{Al}^{3+}[/tex] ions with three positive charges. Each ion will combine with three [tex]\text{Cl}^{-}[/tex] ions to produce a species with the empirical formula [tex]\text{Al}\text{Cl}_3[/tex].
Reactants:
[tex]\text{Al}\;(s)[/tex] and[tex]\text{CuCl}_2\;(aq)[/tex].Products:
[tex]\text{AlCl}_3\;(aq)[/tex] and[tex]\text{Cu}\;(s)[/tex].Let the coefficient in front of [tex]\text{AlCl}_3\;(aq)[/tex] be [tex]1[/tex].
[tex]\begin{array}{cccccccl}\text{Al}\;(s) & +& \text{CuCl}_2\;(aq) & \to & \text{AlCl}_3\;(aq) & + & \text{Cu}\;(s)\\ & & & & {\bf 1} & & &\begin{aligned}&\text{Assign "1" to the most}\\[-0.5em]&\text{complex compound.}\end{aligned} \\ {\bf 1}& &{\bf 3/2} & & 1 & & &\begin{aligned}&\text{Al and Cl atoms}\\[-0.5em]&\text{conserve.}\end{aligned}\end{array}[/tex][tex]\begin{array}{cccccccl}\phantom{\;\text{Al}\;(s)} & \phantom{+}& \phantom{\text{CuCl}_2\;(aq)} & \phantom{\to} & \phantom{\text{AlCl}_3\;(aq)} & \phantom{+} & \phantom{\text{Cu}\;(s)}\\[-1em]1& &{3/2} & & 1 & & {\bf 3/2} &\begin{aligned}&\text{Cu atoms shall also}\\[-0.5em]&\text{conserve.}\end{aligned} \\2& &{3} & & 2 & & {3} &\begin{aligned}&\text{Multiply all}\\[-0.5em]&\text{coefficients by two}\\[-0.5em]&\text{to eliminate fractions.}\end{aligned}\end{array}[/tex].
Hence the balanced equation:
[tex]2 \;\text{Al} \;(s) + 3 \;\text{CuCl}_2\;(aq) \to 2\;\text{AlCl}_3\;(aq) + 3\;\text{Cu}\;(s)[/tex].
Which reactant is limiting?Assume that [tex]\text{CuCl}_2[/tex] is the limiting reactant.
Formula mass of [tex]\text{CuCl}_2[/tex]:
[tex]M(\text{CuCl}_2) = 63.546 + 2 \times 35.45 = 134.446\;\text{g}\cdot\text{mol}^{-1}[/tex].
Number of moles of [tex]\text{CuCl}_2[/tex] available:
[tex]\displaystyle n = \frac{m}{M} = \frac{3.5}{134.446} = 0.0260328\;\text{mol}[/tex].
The ratio between the coefficient in front of [tex]\text{CuCl}_2[/tex] is the same as the coefficient in front of [tex]\text{Cu}[/tex].
[tex]\displaystyle \frac{n(\text{Cu})}{n(\text{CuCl}_2)} = \frac{\text{Coefficient in front of } n(\text{Cu})}{\text{Coefficient in front of } n(\text{CuCl}_2)} = \frac{3}{3} = 1[/tex].
[tex]n(\text{Cu}) = 1 \cdot n(\text{CuCl}_2) = 0.0260328\;\text{mol}[/tex].
Mass of copper that is expected to be produced if [tex]\text{CuCl}_2[/tex] is the limiting reactant:
[tex]m(\text{Cu}) = n(\text{Cu}) \cdot M(\text{Cu}) = 0.0260328 \times 63.546 =1.65\;\text{g}[/tex].
Assume that [tex]\text{Al}[/tex] is the limiting reactant.
The methods are similar. Try the steps above yourself.
Formula mass of [tex]\text{Al}[/tex]:
[tex]M(\text{CuCl}_2) = 26.982\;\text{g}\cdot\text{mol}^{-1}[/tex].
Number of moles of [tex]\text{Al}[/tex] available:
[tex]\displaystyle n = \frac{m}{M} = \frac{0.5}{26.982} = 0.0185\;\text{mol}[/tex].
The ratio between the coefficient in front of [tex]\text{CuCl}_2[/tex] is [tex]3/2[/tex] times the coefficient in front of [tex]\text{Al}[/tex].
[tex]\displaystyle \frac{n(\text{Cu})}{n(\text{Al})} = \frac{\text{Coefficient in front of } n(\text{Cu})}{\text{Coefficient in front of } n(\text{Al})} = \frac{3}{2}[/tex].
[tex]\displaystyle n(\text{Cu}) = \frac{3}{2} \cdot n(\text{Al}) = 0.0277963\;\text{mol}[/tex].
Mass of copper that is expected to be produced if [tex]\text{Al}[/tex] is the limiting reactant:
[tex]m(\text{Cu}) = n(\text{Cu}) \cdot M(\text{Cu}) = 0.0277963 \times 63.546 =1.77\;\text{g}[/tex].
[tex]1.65\;\text{g} < 1.77\;\text{g}[/tex]. The first assumption is valid. [tex]\text{CuCl}_2[/tex] will run out before all [tex]0.5\;\text{g}[/tex] of aluminum are consumed, Only [tex]1.65\;\text{g}[/tex] of copper will be produced.
Need help !!!!! In this question im stuck
As pressure increases volume decreases
As temperature increases pressure increases
As volume increases temperature increases
Explanation:
in the first statement as pressure increases it compresses the volume of the object decreasing it
In the second statement when temperatures increase so does the pressure like when you heat a closed bottle or placed hot water in and you try to open it,it tends to burst
In the third statement when volume increases temperature also increases because it expands when heated
How much mass would a mole of oxygen molecules contain? Recall that oxygen is diatomic. g/mol
32g/mol. The molar mass of an oxygen atom is ~15.999995, which is pretty much 16. Since oxygen is diatomic, you would multiply the molar mass of one atom by two (16 x 2) to get 32 g/mol
Answer: 32 g/mol
Explanation:
According to Avogadro's law, 1 mole of every substance contains avogadro's number [tex](6.023\times 10^{23})[/tex] of particles and weighs equal to its molecular mass.
Diatomic molecule is a molecule formed by combination of two atoms of the same element. Example: [tex]O_2[/tex]
1 mole of oxygen [tex]O_2[/tex] molecule contains = 2 moles of oxygen atoms
1 mole of oxygen atom weigh= 16 g
2 moles of oxygen atoms weigh =[tex]\frac{16}{1}\times 2=32 g[/tex]
Thus 1 mole of oxygen molecule weigh 32 g.
describe an equilibrium in everyday life tgat illustrates a state of balance between two opposing processes
The equilibrium here is when water is boiled in a closed circuit.
What is the point of equilibrium.
The point of equilibrium can be described to be the point where there are no opposing forces. At this point, there are no changes anymore.
In the closed circuit for boiling water, no air or water would be able to leave the pot while at the same time no air or water from outside would be able to enter the pot.
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One simple and everyday example of equilibrium is homeostasis in the human body. Despite changes and fluctuations, the body maintains a balance within specific functional ranges. This dynamic balance is also evident in an ecosystem’s ability to reinstate its equilibrium in spite of disturbances, demonstrating their resistance and resilience.
Explanation:An example of an equilibrium existing in everyday life, which is a state of balance between two opposing processes, can be seen within out personal biology. This is specifically illustrated in the concept of homeostasis in the human body.
Our bodies constantly adjust to internal and external changes through homeostasis ('steady state'). These changes could be in the level of glucose or calcium in our blood or changes in external pressures such as temperature. The body is persistently adjusting to the changes encountered through these process, hence it being a dynamic process.
However, it remains in equilibrium as body functions are kept within a specific range, despite some fluctuations, it's aim is to maintain a balance (set point). So, even an individual that appears inactive is internally maintaining this homeostatic equilibrium.
Another real-life example is within the ecosystem's resistance and resilience. Despite changes in species numbers and occurrences, it manages to maintain a relative constant state of biodiversity. This is its resistance, ability to remain at equilibrium in spite of disturbances. Furthermore, its resilience is shown in its ability to recover its equilibrium state after a disturbance is experienced.
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Need help !!!!! ASAP
Answer:
Barometer.
Explanation:
A barometer is a scientific instrument used to measure air pressure. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems and frontal boundaries.There are many types of barometers: water-based barometers, mercury barometers, vacuum pump oil barometer, and aneroid barometers.which reaction releases the most energy
I believe the answer is A
How does a catalyst speed up a chemical reaction? A. by lowering the activation energy B. by lowering the ΔH of the reaction C. by raising the energy of the products D. by raising the energy of the reactants
Answer:
A. by lowering the activation energy
Explanation:
Adding a catalyst has this effect on activation energy. A catalyst provides an alternative route for the reaction with a lower activation energy. As illustrated in the attached image.This means that more particles have the activation energy required for the reaction to take place (compared to without the catalyst) and so the speed of the reaction increases.Answer:
A. By Lowering the activation energy
Explanation
edmentum/plato family!
give me likes plz!
What does it take to ne classified as a "rogue wave".
Answer:
Rogue waves could safely be classified alongside mermaids and sea monsters. ... A rogue wave is one that is at least twice the "significant wave height", which refers to the average of the third highest waves in a given period of time Rogues, called 'extreme storm waves' by scientists, are those waves which are greater than twice the size of surrounding waves, are very unpredictable, and often come unexpectedly from directions other than prevailing wind and waves.
Most reports of extreme storm waves say they look like "walls of water." They are often steep-sided with unusually deep troughs.
Since these waves are uncommon, measurements and analysis of this phenomenom is extremely rare. Exactly how and when rogue waves form is still under investigation, but there are several known causes:
Constructive interference. Extreme waves often form because swells, while traveling across the ocean, do so at different speeds and directions. As these swells pass through one another, their crests, troughs, and lengths sometimes coincide and reinforce each other. This process can form unusually large, towering waves that quickly disappear. If the swells are travelling in the same direction, these mountainous waves may last for several minutes before subsiding.
Focusing of wave energy. When waves formed by a storm develop in a water current against the normal wave direction, an interaction can take place which results in a shortening of the wave frequency. This can cause the waves to dynamically join together, forming very big 'rogue' waves. The currents where these are sometimes seen are the Gulf Stream and Agulhas current. Extreme waves developed in this fashion tend to be longer lived.
Explanation:
Which stage is the middle stage of speciation? (15 Points)
A) The populations become adapted to different environment and eventually become so different that they cannot interbreed to produce fertile offspring.
B)The populations are isolated and thus do not interbreed.
C) The populations become totally seprated from one another.
D) the populations successfully interbreed.
The populations are isolated and thus do not interbreed.
Answer:B
Answer:
The populations are isolated and thus do not interbreed.
Explanation:
In a certain variety of plants, red flowers appear in majority of plants and blue flowers appear only in a few plants. Which statement correctly describes the two traits? A. Both flower colors are dominant traits. B. Both flower colors are recessive traits. C. Red is a dominant trait and blue is a recessive trait. D. Red is a recessive trait and blue is a dominant trait.
Answer:
C
Explanation:
In the described scenario, red is a dominant trait which manifests more frequently in the plants, whereas blue is a recessive trait which appears less often. Hence, the correct option is C.
In a certain variety of plants where red flowers appear in the majority of plants and blue flowers appear only in a few, the correct description of the two traits would be that red is a dominant trait and blue is a recessive trait. This is because dominant traits are those that are expressed or visible in the organism when at least one dominant allele is present. Conversely, recessive traits require both alleles to be recessive in order to be expressed. Since red flowers are more common, it suggests that the red-flower trait is dominant over the blue-flower trait which is recessive and appears less frequently.
synthetic Plastics are made by linking many simple carbon molecules together to form much larger molecules. the process is called
Answer:
Polymerization
Explanation:
Several natural and man-made organic compounds are enormous molecules which contains hundreds of thousands of atoms per molecule.
The giant molecules formed are produced through the process of polymerization.
Polymerization is the linking of monomers through chemical reactions to form long chain polymer molecules.
Monomers are small molecules that are joined to form polymers.
Synthetic plastics are derieved from synthetic polymers. These synthetic materials are very useful and vital due to their great size. Their size premits a certain complexity of structure which makes the molecules disposed in a regular pattern with respect to one another. They stretch out nearly to alongside of one another or coil up independently. The polymerization of monomers to form plastics fosters the various uses these giant molecules are put to.
Answer:
polymerization.
Explanation:
Consider the redox reaction below.
Answer : The correct option is, [tex]Fe^{2+}(aq)+2e^-\rightarrow Fe(s)[/tex]
Explanation :
Redox reaction or Oxidation-reduction reaction is the reaction in which the oxidation and reduction reaction takes place simultaneously.
Reduction reaction : The reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
Oxidation reaction : The reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
The given balanced chemical reaction is :
[tex]Mg(s)+Fe^{2+}(aq)\rightarrow Mg^{2+}(aq)+Fe(s)[/tex]
The oxidation-reduction half reaction will be :
Oxidation : [tex]Mg\rightarrow Mg^{2+}+2e^-[/tex]
Reduction : [tex]Fe^{2+}+2e^-\rightarrow Fe[/tex]
In this reaction, the oxidation state of 'Mg' changes from (0) to (+2) that means Mg lost 2 electrons and it shows oxidation and the oxidation state of 'Fe' changes from (+2) to (0) that means Fe gains 2 electrons and it shows reduction.
Therefore, the correct option is, [tex]Fe^{2+}(aq)+2e^-\rightarrow Fe(s)[/tex]
2. At STP, how many liters of oxygen are required to react completely with 3.6 liters
of hydrogen to form water?
2H2(g) + O2(g)
2H20(g)
Answer:
1.8 L.
Explanation:
The balanced equation for the mentioned reaction is:2H₂(g) + O₂(g) → 2H₂O(g),
It is clear that 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.
At STP, 3.6 L of H₂ reacts with (?? L) of oxygen gas:It is known that at STP: every 1.0 mol of any gas occupies 22.4 L.
using cross multiplication:
1.0 mol of H₂ represents → 22.4 L.
??? mol of H₂ represents → 3.6 L.
∴ 3.6 L of H₂ represents = (1.0 mol)(3.6 L)/(22.4 L) = 0.1607 mol.
To find the no. of moles of O₂ nneded to react completely with 3.6 liters (0.1607 mol) of hydrogen:Using cross multiplication:
2.0 mol of H₂ react completely with → 1.0 mol of O₂, from stichiometry.
0.1607 mol of H₂ react completely with → ??? mol of O₂.
∴ The no. of moles of O₂ = (1.0 mol)(0.1607 mol)/(2.0 mol) = 0.08036 mol.
Again, using cross multiplication:1.0 mol of O₂ represents → 22.4 L, at STP.
0.08036 mol of O₂ represents → ??? L.
∴ The no. of liters of O₂ will be produced = (0.08036 mol)(22.4 L)/(1.0 mol) = 1.8 L.
Answer:
The answer is 1.8 L
Reaction with lithium and aluminum chloride formula?
it will produce aluminum hydride and lithium chloride.
AlCl3 + 3LiH → AlH3 + 3LiCl
Drag each label to the correct location on the table. Match each scenario to the law that explains it.
there isn't anything here to answer
Answer:
Boyle's law (PV = k)
-When the size of an air chamber is increased, the air pressure decreases.
-Pressing on an inflated balloon decreases its size.
Charles's law (V/T = k)
-A closed, flexible container expands when its heated.
-A balloon shrinks when it's taken outside in the winter.
Avogadro's law (V/n = k)
-A balloon expands when air is blown into it.
How does a weather balloon assist with radiosonde reports
carries instruments aloft to send back information on atmospheric pressure, temperature, humidity and wind speed by means of a small, expendable measuring device called a radiosonde.
Weather balloons carry a radiosonde that provides essential data for weather prediction by sending back information on atmospheric conditions as it ascends to the stratosphere. This data is critical not only for daily weather reports but also for severe weather predictions. Satellites complement these observations by tracking larger atmospheric patterns.
Weather balloons play a crucial role in the systematic collection of weather data. These balloons carry a radiosonde that ascends through the atmosphere and transmits valuable information about atmospheric conditions such as temperature, pressure, humidity, and wind speed. Carried into the stratosphere, these balloons encounter different layers of the atmosphere, providing detailed, vertical profiles that are essential for meteorologists to predict the weather.
Since their conception over 70 years ago, weather balloons have proven to be an indispensable tool for meteorologists. Beyond compiling everyday weather reports, the data collected by these balloons is crucial for predicting severe weather events such as hurricanes or flooding.
The combination of data from weather balloons, satellites, and radar enables comprehensive monitoring of weather patterns. While satellites monitor large sections of the atmosphere and track various environmental elements, weather balloons provide localized, vertical data that is critical for an in-depth understanding of weather phenomena. Together, they form a synergistic network for global weather observation.
A sample of glucose ( C6H12O6 ) of mass 8.44 grams is dissolved in 2.11 kg water. What is the freezing point of this solution? The freezing point depression constant, Kf , for water is 1.86 °C/mol. (Round your answer to the nearest thousandth)
Answer:
- 0.0413°C ≅ - 0.041°C (nearest thousands).
Explanation:
Adding solute to water causes the depression of the freezing point.We have the relation:ΔTf = Kf.m,
Where,
ΔTf is the change in the freezing point.
Kf is the freezing point depression constant (Kf = 1.86 °C/m).
m is the molality of the solution.
Molality is the no. of moles of solute per kg of the solution.
no. of moles of solute (glucose) = mass/molar mass = (8.44 g)/(180.156 g/mol) = 0.04685 mol.∴ molality (m) = no. of moles of solute/kg of solvent = (0.04685 mol)/(2.11 kg) = 0.0222 m.
∴ ΔTf = Kf.m = (1.86 °C/m)(0.0222 m) = 0.0413°C.
∴ The freezing point of the solution = the freezing point of water - ΔTf = 0.0°C - 0.0413°C = - 0.0413°C ≅ - 0.041°C (nearest thousands).
which statement is NOT true about the elements flourine, chlorine, and iodine?
a) they are all halogens
b) They react easily with metals
c) They are similar to noble gases
d) They are all nonmetals
They are all nonmetals
The fluorine, iodine, and chlorine are c) They are similar to noble gases.
Explanation:Nobel gas refers to those substances which doesn't have any vacant shell. They are completely filled. They are electron haters and are really hard to make them involve in chemical reaction. On the other hand, gases such as chlorine, bromine and iodine are called as halogens. They have ability to accommodate one electron in their valence shell as they have 7 already.
Thus, it can be inferred that gases such as chlorine, bromine and iodine are not similar to Nobel gas and thus the statement C which states they are similar to Nobel gas is considered as false.
Please hurry!!
Match these factors:
height above sea level
continent/ocean
latitude
moisture available
in ocean
---------------------
To the climates they effect:
temperature
altitude
geography
rainfall
currents
Answer:
height above sea level---->altitude
continent/ocean-----> geography
latitude---->temperature
moisture available --->rainfall
in ocean-->currents
Explanation: no
Hope this helps!
Correct match pair for altitude is sea level, for continent is geography, for latitude is temperature, for moisture is rain fall and for ocean is currents.
What are wind waves?A wind wave, also known as a wind-generated wave, is a water surface wave that occurs on the free surface of bodies of water in fluid dynamics. Wind waves are created when wind blows across a fluid surface.
Altitude is a distance which is above the sea level.Continent is a massive land area which is related to geography.Latitude is an angle which ranges from 0° at the Equator to 90° at the poles and it is inversely proportional to the temperature.Moisture is an atmospheric content which is present in rain fall.In ocean, currents of waves are occur.Hence correct matches are shown above.
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Select the correct answer.
Which notation is used to represent gamma decay?
A.
B.
C.
D.
Gamma decay is usually represented by the Greek letter gamma (">gamma"). In the nuclear equation for the decay of boron-12, which emits a beta particle and a gamma ray, the resulting daughter isotope is carbon-12.
Explanation:In nuclear chemistry, gamma decay is often represented by the Greek letter gamma ">">">">">
^12B -> ^12C + e- + ">gamma">">The starting isotope is boron-12 (^12B). During the decay, a beta particle (e-) is emitted, which is essentially an electron, and a gamma ray is emitted as well. The resulting or daughter isotope is carbon-12 (^12C).
It's essential to memorize the symbols and notations for different types of radioactive decay, as they are commonly used in nuclear chemistry calculations. The emission of gamma rays typically accompanies other types of radioactive decay, such as alpha or beta decay, rather than occurring alone. Therefore, when writing nuclear equations, the presence of a gamma ray is shown by adding the gamma symbol to the equation.
what are two diseases that involve the thyroid gland? describe each disease
Answer: Thyroid disorders can range from a small, harmless goiter (enlarged gland) that needs no treatment to life-threatening cancer. The most common thyroid problems involve abnormal production of thyroid hormones. Too much thyroid hormone results in a condition known as hyperthyroidism.
Explanation:
Answer:
Hyperthyroidism and hypothyroidism.
Explanation:
Hyperthyroidism and hypothyroidism are thyroid diseases that affect women the most.
Hyperthyroidism (ICD 10 - E05) is a problem in which the thyroid gland produces excess hormones, which impacts on various body functions. Here the gland is overactive, that is, it works in excess. Hyperthyroidism occurs when the thyroid produces large amounts of these hormones in a short (acute) or long (chronic) period of time.
Hypothyroidism is, in short, a decrease in the production of thyroid hormones - triiodothyronine (T3) and thyroxine (T4). It is the most common disorder of this gland, which is in the neck area and resembles a butterfly. Its performance reverberates throughout the body, interfering in the heartbeat, the rhythm of the intestine, the mood and the menstrual cycle of women. The release of thyroid substances is orchestrated from the pituitary gland, a structure that is there in the brain.
How much heat in kilojoules is evolved in converting 2.00 mol of steam at 150 ∘C to ice at -55.0 ∘C? The heat capacity of steam is 1.84 J/g∘C and that of ice is 2.09 J/g∘C.
Remember that if heat is leaving the system, then q is a negative number and if heat is entering the system, then q is a positive number.
Answer:
= 115.898 kJ
Explanation:
Heat evolved in converting 2.00 mol of steam at 150 ∘C to ice at -55.0 ∘C
Will be calculated in steps
Step 1; Heat evolved by steam from 150°C to 100°C
Heat = (2×18) g × 1.84 J/g°C × (150 -100)
= 3312 Joules
Step 2; Heat required to convert steam to water without change in temperature;
Heat = moles × Molar Latent heat of vaporization.
= 2 moles × 4.07 ✕ 104 J/mol
= 8.14 × 10^4 Joules
Step 3: Heat evolved by water from 100°C to 0°C.
Heat = mass × specific heat capacity × ΔT
= (2 × 18) × 4.18 J/g°C × 100
= 15,048 Joules
Step 4; Heat evolved in converting water at 0°C to ice at 0°
Heat = number of moles × molar latent heat of fusion
= 2 moles × 6000 j/mole
= 12 000 Joules
Step 5, heat evolved in converting ice at 0°C to -55°C
Heat = mass × specific heat capacity × ΔT
= (2×18) × 2.09 j/g°C × 55
= 4138.2 Joules
Total amount of heat evolved;
= 3312 J + 8.14 × 10^4 J + 15,048 J + 12 000 J + 4138.2 J
= 115,898.2 joules
= 115.898 kJ
To find the heat evolved in converting steam to ice, we need to consider the heat absorbed in three steps: heating the steam to 0°C, melting the ice, and finally cooling the water to -55.0°C. The heat evolved is approximately 235.92 kJ.
Explanation:To find the heat evolved in converting steam to ice, we need to consider the heat absorbed in three steps: heating the steam to 0°C, melting the ice, and finally cooling the water to -55.0°C. We can calculate the heat absorbed in each step using the given heat capacities of steam and ice.
First, we calculate the heat absorbed in heating the steam from 150°C to 0°C. The formula for calculating heat is Q = mcΔT, where Q is the heat, m is the mass, c is the heat capacity, and ΔT is the change in temperature.
The heat absorbed in heating the steam is Q = (2.00 mol)(18.02 g/mol)(1.84 J/g°C)(0 - 150°C) = -5,232.48 J. Since heat is leaving the system, the heat absorbed is a negative value.
Next, we calculate the heat absorbed in melting the ice at 0°C. The formula for calculating heat is Q = mL, where Q is the heat, m is the mass, and L is the heat of fusion.
Using the given information, the heat absorbed in melting the ice is Q = (100 g)(2.09 J/g°C) = 209.0 J.
Finally, we calculate the heat absorbed in cooling the water from 0°C to -55.0°C. The formula for calculating heat is Q = mcΔT, where Q is the heat, m is the mass, c is the heat capacity, and ΔT is the change in temperature.
The heat absorbed in cooling the water is Q = (100 g)(4.18 J/g°C)(-55.0 - 0°C) = -229,900 J. Since heat is leaving the system, the heat absorbed is a negative value.
To find the total heat absorbed in all three steps, we add the heats together: -5,232.48 J + 209.0 J - 229,900 J = -235,923.48 J.
To convert the heat from joules to kilojoules, we divide by 1000: -235,923.48 J / 1000 = -235.92 kJ.
Therefore, the heat evolved in converting 2.00 mol of steam at 150°C to ice at -55.0°C is approximately 235.92 kJ.
11th grade chemistry study guide need help
Answer:
45) the answer is C.
46) The calculation of quantities in chemical reaction is called Stoichiometry .
47) The phase changed from solid to gas so I think the answer is A.
48) The phase changed from solid to gas as well so I think that the answer is A again.
49) Applying the formula n = m/M, we have n = 1.5 moles, therefore the answer is D.
50) C2H4 + 3O2 -> 2H2O + 2CO2
The answer is C.
51) The answer is C.
52) 2NaHCO3 + CaCl2 -> CaCO3 + H2O + 2NaCl + CO2
Hopefully I got all of them correct.
12.5M AgNO3 is made using 3.5L H2O. How many grams AgNO3 are needed to produce the solution?
Answer:
612 g
Explanation:
concentration or molarity is the number of moles of solute in 1 L of solution
the molarity of the solution is 12.5 M
therefore there are 12.5 mol in 1 L of solution
in 1 L of solution there are 12.5 mol
therefore in 3.5 L there are - 12.5 mol/L x 3.5 L = 3.6 mol
molar mass of AgNO₃ is 170 g/mol
mass of 3.6 mol of AgNO₃ is - 170 g/mol x 3.6 mol = 612 g
612 g of AgNO₃ is needed to make a 12.5 M solution
the summary or ending of your experiment
Answer:
Conclusion
Explanation:
I believe you were asking for the term that best matches with the description given. Typically the conclusion summarizes your experiment in a 1 to 2 paragraph format.
Final answer:
The conclusion section of a scientific paper is crucial for summarizing experimental findings, interpreting results in the context of the experiment's aims, discussing shortcomings, and recommending further research. It should address the original hypothesis and contemplate improvements for future experiments.
Explanation:
The conclusion section of a scientific paper is vital as it summarizes the importance of the experimental findings. A conclusion should clearly describe the purpose of the experiment, discuss the major findings, offer a brief explanation of these findings, and present recommendations for further study. When drafting the conclusion, it's essential to answer the original question posed by the experiment, using the results obtained. The conclusion should also highlight any shortcomings of the experiment and suggest what could be changed or extended in future research, such as collecting more data for better statistical analysis or modifying the experimental method.
The conclusion is not just a summary but serves to interpret the results in the context of the experiment's aims. If the experiment was designed to test a hypothesis, the conclusion should state whether the findings support it. Furthermore, the conclusion might also raise new questions that emerged from the study, suggest areas for further research, and identify any systematic errors or unexpected insights about the subject matter or the scientific method in general. Reflecting on what could be improved if the experiment were to be redone is also a valuable part of the concluding section.
Evaporation occurs at the surface of a liquid. Which particles of the liquid will evaporate?
Answer:
Explanation:
In simplest terms, the fastest moving ones that are closest to the surface.
The particles with the highest kinetic energy are the first to evaporate from a liquid.
Which of these is NOT an example of one or more forces acting on an object? A. an apple decaying B. an apple falling from an apple tree C. an apple staying at rest on the ground D. an apple hanging from an apple tree branch
Answer: C, an apple staying at rest on the ground.
Explanation: When one or more unbalanced forces are acting on an object, it causes change (eg. the apple falling on the ground would be a result of gravity being stronger than the kinetic energy that the tree is putting on the apple). Even in D, the apple is not moving, but the tree branch is still exerting force to keep the apple hanging there.
PS: I studied net forces last year. Hope this helps!
Which segments represent changes in kinetic energy of the molecules in the substance?
Check all that apply.
A-B
B-C
C-D
D-E
E-F
Answer:
A-B, C-D,E-F , Temperature changes
Explanation:
Answer:Its b and D first person is wrong.
Explanation:
A __________ takes place when the sun, earth, and moon are in nearly a straight line with the earth being between the sun and the moon.
corona
lunar eclipse
solar eclipse
Lunar eclipse
A solar eclipse is when the Moon is between the Earth and the Sun, and a lunar eclipse is when the Earth is between the Moon and the Sun.
Which of the following is true about hygroscopic substances
A. They have low vapor pressures
B. They remove moisture from the air
C. They can be used as drying agents
D. All of the above
B is fasho the answer thank me later, It's not C because it can be used as a drying agent but not all hygroscopic substances are Drying agents and It also can be A
Answer:
Explanation:
It is D. All of the above
When Magnesium Sulfate and Calcium Chloride are mixed what is the chemical reaction
Answer:
MgSO₄(aq) + CaCl₂(aq) → CaSO₄(s) + MgCl₂(aq).
Explanation:
It is a double replacement reaction.A double displacement reaction, also known as a double replacement reaction or metathesis, is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.The reaction between Magnesium Sulfate and Calcium Chloride is represented as:MgSO₄(aq) + CaCl₂(aq) → CaSO₄(s) + MgCl₂(aq).
The products are calcium sulfate and magnesium chloride.
Final answer:
In the reaction between Magnesium Sulfate and Calcium Chloride, a double displacement reaction occurs, forming solid Calcium Sulfate (a precipitate) and Magnesium Chloride in solution.
Explanation:
When Magnesium Sulfate and Calcium Chloride are mixed together in an aqueous solution, a double displacement reaction, also known as a precipitation reaction, occurs. The chemical equation for this reaction is:
MgSO₄(aq) + CaCl₂(aq) → CaSO₄(s) + MgCl₂(aq)
In this reaction, the ions of magnesium and calcium will exchange their respective anions, sulfate, and chloride. This results in the formation of solid Calcium Sulfate (CaSO₄), a precipitate, and Magnesium Chloride (MgCl₂) in aqueous solution.