Answer:
None of the options are correct. The answer to the question is 353.2g
Explanation:
The equation for the reaction between is given below:
KI + AgNO3 —> KNO3 + AgI
Molar Mass of KI = 39 + 127 = 166g/mol
Molar Mass of AgI = 108 + 127 = 235g/mol
From the equation,
166g of KI produced 235g of AgI.
Therefore, Xg of KI will produce 500g of AgI i.e
Xg of KI = (166 x 500)/235 = 353.2g
In which of the following choices is the oxidation number incorrect?
Cl2(s); oxidation number = 1–
Fe3+(aq); oxidation number = 3+
Ni(s); oxidation number = 0 I–(aq); oxidation number = 1–
Cu+(aq); oxidation number = 1+
Cl2(s); oxidation number 1 is the incorrect choices in oxidation number.
Explanation:
In the elemental form oxidation state is zero. Here chlorine is present in elemental form so oxidation state is zero.
Oxidation number depends on the number of electrons gained or lost by an atom of the element say in compound formation.
If electron is gained oxidation number becomes negative.
If electron is lost then oxidation number is positive.
If the octet rule is fulfilled that valence shell is filled them atomic number gets zero. Since Cl2 is in neutral state the oxidation number is 0.
Oxidation number in general can be made out by checking the valency of the element as oxidation number is also equal to the valency.
Check all items common to bases.
minerals
metal
gas
H+
OH-
nitrogen
OH- is common to bases.
Explanation:
The base is a is an ionic compounds which when placed in aqueous solution dissociates in to a cation and an anion OH-.
The presence of OH- in the solution shows that the solution is basic or alkaline.
From Bronsted and Lowry concept base is a molecule that accepts a proton for example in NaOH, Na is a proton donor and OH is the proton acceptor.
A base accepts hydrogen ion and the concentration of OH is always higher in base.
There is a presence of conjugate acid and conjugate base in the Bronsted and Lowry acid and base.
Conjugate acid is one which is formed when a base gained a proton.
Conjugate base is one which is formed when an acid looses a proton.
And from the Arrhenius base Theory, the base is one that dissociates in to water as OH-.
Answer:
metal and OH-
Explanation:
1. What is the equation for Boyle's Law?.
2. What does the letter P stand for?
3. What are the units for P?
4. What does the letter V stand for?
5. What are the units for V?
Answer: 1. P1V1 = P2V2
2. P stands for pressure
3. Units for Pressure are atm and Pa
4. V stands for volume
5. Units for volume is in mL
Explanation: Boyle's Law is a gas law that states the relationship between pressure and volume of a gas.
1. P₁V₁ = P₂V₂
2. P stands for pressure
3. Units for Pressure are atm and Pa
4. V stands for volume
5. Units for volume in mL
Boyle's Law:The volume of a gas at constant temperature varies inversely with the pressure exerted on it. It is given by:
P₁V₁ = P₂V₂
Where,
P is the pressure and
V is the Voulme
The units can be given in volume is measured in litres; pressure in atmospheres; and temperature in degrees Kelvin.
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Claims • Evidence • Reasoning Make a
claim about how the sun's energy affects the
climate of an area. Provide evidence with
factors supporting your claim. Explain your
reasoning
Answer:
The Earth spins on its axis, but it also precesses about that same axis - it wobbles - and the Earth’s temperature is affected. A Desert makes a terrible heat; look at Arabia - it was once COVERED IN LUSH greenery - that is where The oil came from, millions of years of pressure on all that detritus. Britain was once very famous (2000 years ago) for all its wines - not so much now, huh?
Explanation:
Final answer:
The sun's energy affects Earth's climate through its intensity and distribution due to natural cycles and Earth's orbital dynamics, contributing to weather patterns and temperature variations.
Explanation:
Claims, Evidence, and Reasoning on Sun's Energy and Climate:
Here's a claim about how the sun's energy affects the climate of an area: The intensity and distribution of solar energy directly influence Earth's climate, leading to variations in temperature and weather patterns across the globe. The evidence supporting this claim includes the observation of the sun's natural 11-year cycle, which brings about small changes in the energy output that can affect climate patterns minimally. Additionally, scientific data shows that changes in Earth's orbit, tilt, and axial position can significantly alter the distribution of sunlight, leading to seasonal climate changes and potentially contributing to longer-term climate variations.
The reasoning behind this claim lies in the understanding of the greenhouse effect and how it modulates global temperatures. Gases in Earth's atmosphere trap heat from the sun, which can be intensified by stronger solar intensity resulting in global warming or reduced with weaker solar intensity leading to global cooling. The interactions among Earth's climate system components also regulate the overall climate, with the sun being the primary source of energy driving these interactions.
Why is it important to reduce coefficients in a balanced equation to the lowest possible whole-number ratio?
Answer:
it is important because in that way chemist can see lowest possible number of reactants in chemical reaction needed to form product of reaction. Coefficients with the lowest ratio indicate the relative amounts of substances in a reaction.
Explanation:
What is the molar mass of a 1.25 g sample of gas that occupies a volume of 1.00L at a pressure of 0.961 ATM and a temp of 27°C
Answer:
The molar mass of the gas is 32.03 g/mol
Explanation:
Pressure of gas = P = 0.961 atm
Volume occupied by gas = V = 1.00 L
Temperature = T = 27[tex]^{\circ}C[/tex] = 300 K
Assuming M g/mol be the molar mass of the gas and the gas behaves as an ideal gas.
The ideal gas equation is shown below
[tex]\textrm{PV} =\textrm{nRT} \\\textrm{PV} = \displaystyle \frac{m}{M}\textrm{ RT } \\0.961 \textrm{ atm}\times 1.00 \textrm{ L} = \displaystyle \frac{1.25 \textrm{ g}}{M}\times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1}\times 300\textrm{K} \\M = 32.03 \textrm{ g/mol}[/tex]
Molar mass of given sample of gas = 32.03 g/mol
Which structure of the cell controls what goes in and comes out of the cell? cell Which structure is a strong layer around plant cells? cell
Answer:
Cell membrane
Cellulose cell wall
Explanation:
The cell membrane is the structure that contains what goes in out of a cell. It is made up of double phospholipid layers.
This cell membrane is also known as the plasma membrane. It is found in both plants and animal cells.
They regulate the movement of materials in and out of the cell. They also provide structural support.
The cellulose cell well is a strong layer found in most plant cells. They are not found in animal cells. These structures are found just outside of the cell membrane in plants. They provide additional support for the cell They are rigid and not flexible.
Answer: 1: membrane 2: wall
Explanation: I got it wrong but it show me the answer
The volume of a gas at 99.6 kPa and 24°C is 4.23 L. What volume will it occupy at 93.3 kPa ?
Final answer:
To find the new volume of the gas when the pressure changes from 99.6 kPa to 93.3 kPa, one applies Boyle's Law, resulting in a new volume of 4.53 L.
Explanation:
The question involves using Boyle's Law, which states that for a given mass of ideal gas at constant temperature, the product of pressure and volume is constant. In the given example, the initial condition is a volume of 4.23 L of gas at a pressure of 99.6 kPa. When the pressure changes to 93.3 kPa, we want to find out what the new volume of the gas will be, assuming temperature and amount remain constant. We can use the equation:
P1 * V1 = P2 * V2
Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume respectively. Plugging in the initial conditions and solving for V2 gives us the formula:
V2 = (P1 * V1) / P2
Inserting the values:
V2 = (99.6 kPa * 4.23 L) / 93.3 kPa = 4.53 L
So the new volume of the gas will be 4.53 L after the pressure has been adjusted to 93.3 kPa.
What is the term for substances that prevent drastic changes in pH
Answer:
It is termed a buffering agent
Explanation:
A buffering agent consist of a weak acid and a base that is used to maintain the acidity of a solution after the addition of
another acid or base
A buffer is used to prevent any rapid change in ph
What is the ability to do work or cause change is called ?
Energy is the capacity to do work. Work is the process of causing matter to move against an opposing force, such as inflating a bicycle tire.
Explanation:Energy can be defined as the capacity to supply heat or do work. One type of work is the process of causing matter to move against an opposing force. For example, we do work when we inflate a bicycle tire—we move matter (the air in the pump) against the opposing force of the air already in the tire.
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A barcode can be printed on a product to help identify the product. A barcode usually consists of several alternating vertical black and white lines of various widths. A barcode scanner is used to read the information stored in a barcode. The barcode scanner projects a beam of light on the barcode. The light that reflects from the barcode is decoded to give information about the product.
Which of the following processes enables the scanner to decode the information from the barcode?
A:The projected light from the scanner is absorbed by the black lines and reflected by the white lines of the barcode, which creates a pattern on the optical sensor of the scanner.
B:The projected light from the scanner is refracted by the lines on the barcode, which changes the speed of the light hitting the optical sensor of the scanner.
C:The projected light from the scanner interferes with the reflected light from the barcode, and this combined beam of light is recognized by the optical sensor of the scanner.
D:The projected light from the scanner is diffracted by the barcode, which creates a pattern on the optical sensor of the scanner.
Answer:
A
Explanation:
The barcode is being read by a laser that scans along the length of the sequence, reflecting more light from the white strips and less from the black strips. Hope this helps!
Answer:
The Answer is A
Explanation:
Had it before
Show Your Work
2SO3(g) -> 2SO2(g)+O2(g)
Calculate Keq for this reaction if the equalibrium concentrations are: |SO2|=0.42M; |O2|=0.21M; |SO3|=0.072M
Answer:
The equilibrium constant for the reaction comes out to be 7.145
Explanation:
Given concentration of all the species at equilibrium are shown below
[tex]\left [ SO_{2} \right ] = 0.42 \textrm{ M}, \left [ O_{2} \right ] = 0.21 \textrm{ M}, \left [ SO_{3} \right ] = 0.072 \textrm{ M}[/tex] \\
Given reaction is shown below
[tex]2\textrm{SO}_{3}\left ( g \right )\rightleftharpoons 2\textrm{SO}_{2}\left ( g \right )+\textrm{O}_{2}\left ( g \right )[/tex]
[tex]K_{eq} = \displaystyle \frac{\left [ SO_{2} \right ]^{2}\times \left [ O_{2} \right ]}{\left [ SO_{3} \right ]^{2}} \\K_{eq} = \displaystyle \frac{\left ( 0.42 \right )^{2}\times 0.21}{\left ( 0.072 \right )^{2}} \\K_{eq} = 7.145[/tex]
[tex]K_{eq}[/tex] for the reaction is 7.145
The equilibrium constant (Keq) for the reaction 2SO3(g) -> 2SO2(g) + O2(g) is calculated using the equilibrium concentrations of the reactants and products and the formula Keq = ([SO2]^2 * [O2]) / ([SO3]^2), yielding an approximate value of 7.15.
The student is asking how to calculate the equilibrium constant (Keq), also referred to as the equilibrium constant Kc, for the reverse reaction 2SO3(g) -> 2SO2(g) + O2(g) given the equilibrium concentrations of the reactants and products. To calculate Keq, we use the following equilibrium expression:
Keq = ([SO2]^2 * [O2]) / ([SO3]^2)
Substituting the equilibrium concentrations into the expression gives:
Keq = (0.422 * 0.21) / (0.0722)
Keq = (0.1764 * 0.21) / (0.005184)
Keq = 0.037044 / 0.005184
Keq = 7.146 (rounded to three significant figures)
Therefore, the value of the equilibrium constant (Keq) for the reaction 2SO3(g) -> 2SO2(g) + O2(g) is approximately 7.15.
What do radio waves and gamma rays have in common?
Answer: The sequence from longest wavelength (radio waves) to shortest wavelength (gamma rays) is also a sequence in energy from lowest energy to highest energy. ... The energy carried by a radio wave is low, while the energy carried by a gamma ray is high. Different materials can block different types of light.
PLEASE MARK BRAINLIEST
They are both electromagnetic waves.
I hope this helps :/
what is metamorphosis ? explain
Explanation:
nounZOOLOGY
(in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages
Answer: Metamorphosis is a process of the life cycle where an organism develops certain changes in its physical body.
Explanation: An example is the development of a cocoon to a larva changed into a pupa and finally into a butterfly.
What was role of early genetic engineering for animal
Role of early genetic engineering for animal
Explanation:
Genetic engineering is the process of artificial alteration or manipulation of the original genetic makeup of an organism and then modification and recombination using technologies like the DNA recombinant technology.
Early genetic engineering began with expressing specific bacterial genes by Cohen in 1973. Later due to various anxieties arising about hazardous reshaping of genetic systems, it came to a slowdown.
Then all these anxieties were subdued with the advent of DNA recombinant plasmid-based technology which was very helpful to understand the molecular genetic mechanisms in animals.
In animals genetic engineering is mainly used to find genes responsible for beneficial traits or characters introduce them into another animal’s genome and create a new offspring with the beneficial character.
The first animal which was created by genetic engineering was a mouse by Rudolf Jaenisch in 1974. Later many transgenic animals were developed like chicken, mice, cattle, sheep, pig etc.
in this lesson you learned that absolute time is time mesured in definite periods such as minutes days, and years, lest two ways of recording or meauring absolute time.
Absolute time is measured using fixed units, with early methods involving hourglasses using sand, and modern methods using atomic oscillations. Calendars derive from celestial motions, with years, months, and days based on Earth and the Moon's movements.
Absolute time is the measurement of time in fixed units such as seconds, minutes, days, and years. There are two main ways to record or measure absolute time: one is based on the duration of events, and the other is through periodic motion.
Early methods of measuring time duration included devices like hourglasses that used the flow of sand to measure the passing of time. Today, precise measurement of time uses the oscillation of physical phenomena, such as the vibration of a cesium atom to define a second.
As for periodic motion, our common calendar is derived from celestial movements: years from Earth's orbit around the Sun, months from the Moon's orbit around Earth, and days from Earth's rotation on its axis. These are fundamental in tracking the passage of time in our daily lives.
The speed of a wave on a guitar string is 100 m/s, and the frequency is 1,000 Hz. what is the wavelength of the wave?
Answer:3
Explanation:
A sample of neon occupies a volume of 478 mL at STP. What will be the volume of the neon when the pressure is reduced to 93.3 kPa?
The volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.
Explanation:
The kinetic theory of gases is mostly based on Boyle's law. From the Boyle's law, the pressure experienced by any gas molecules is inversely proportional to volume of the gas molecules. Also this inverse relation is obeyed if and only if the number of moles and temperature of the gas molecules remained constant.
So,[tex]P=\frac{1}{V}[/tex]
So if there is a change in pressure then there will be inverse change in volume. That means if there is decrease in the pressure of gas molecules then there will be increase in the volume and vice versa.
So the Boyle's law is combined as [tex]P_{1} V_{1} = P_{2} V_{2}[/tex]
As here the initial pressure or [tex]P_{1}[/tex] is 1 atm or 101.3 kPa and the initial volume is 478 mL. Similarly, the final pressure is 93.3 kPa and the final volume will be
[tex]101.3*10^{3}*478*10^{-3} = 93.3*10^{3} * V_{2}[/tex]
[tex]V_{2} = 519 mL[/tex]
So, the volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.
What is bond length?
Answer:
Bond length or bond distance is defined as the average distance between nuclei of two bonded atoms in a molecule.
Explanation:
Answer:
In molecular geometry, bond length or bond distance is defined as the average distance between nuclei of two bonded atoms in a molecule.
Explanation:
It is a transferable property of a bond between atoms of fixed types, relatively independent of the rest of the molecule.
Use these images to identify each state of matter.
Match each image with the correct state of matter.
Answer:
Match each image with the correct state of matter.
A: Gas
B: solid
C: liquid
Explanation:
hope this helps
If we increase the temperature of the tank to 85C, what will the new pressure be inside the tank?
Answer:
The new pressure will increase.
Explanation:
If the temperature in a tank increases, the pressure inside the tank will also increase. This is one of the postulates of the general gas law.
Pressure exerted by a gas is it's force per unit area.
When we reduce the equation of the combined gas law taking the number of moles to be 1, we see that;"at constant volume, the pressure of a given mass or mole of gas varies directly with the absolute temperature" .
The higher the pressure, the higher the temperature will be.
Since the complete parameters are not given, use this expression below:
[tex]\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }[/tex]
where P and T are pressure and temperature
1 and 2 represents initial and final states.
The new pressure in the tank when the temperature is increased to 85°C can be calculated using Charles's Law, which requires converting temperatures to Kelvin and then applying the formula P1/T1 = P2/T2.
Explanation:To calculate the new pressure in the tank when the temperature is increased to 85°C, we can apply Charles's Law, which states that for a fixed amount of gas at constant volume, the pressure is directly proportional to its temperature in Kelvin. This implies that if the temperature increases, the pressure will also increase proportionally. To find the new pressure P₂, we use the equation P₁/T₁ = P₂/T₂, where P₁ is the initial pressure, T₁ is the initial temperature, P₂ is the final pressure, and T₂ is the final temperature.
For example, if a gas tank has an initial pressure P₁ of 1.0 atm at a temperature of 20°C (which is 293.15 K when converted to Kelvin), and the temperature is increased to 85°C (358.15 K in Kelvin), the new pressure P₂ can be calculated as follows:
P₂ = P₁ × (T₂ / T₁)
P₂ = 1.0 atm × (358.15 K / 293.15 K)
P₂ would then be calculated to find the pressure at the higher temperature.
The coefficients for the equation are:
KClO3 =
KCl +
O2
Answer:
The coefficient of [tex]KClO_{3}[/tex] , KCl and [tex]O_{2}[/tex] are 2, 2 and 3 respectively.
Explanation:
The heating of [tex]KClO_{3}[/tex] to give KCl and oxygen gas is an example of decomposition reaction.
The balanced reaction for the decomposition of [tex]KClO_{3}[/tex] is shown below
[tex]2KClO_{3}\rightarrow 2KCl+3O_{2}[/tex]
The coefficient of [tex]KClO_{3}[/tex] is 2
The coefficient of KCl is 2
The coefficient of [tex]O_{2}[/tex] is 3
Final answer:
In Chemistry, the decomposition of potassium chlorate (KClO₃) is balanced to show that 2 moles of KClO₃ produce 3 moles of O₂. Therefore, 1.65 moles of KClO₃ will produce 2.475 moles of O₂.
Explanation:
The question involves balancing a chemical equation, which is a fundamental concept in Chemistry. You are seeking to find the coefficients for the decomposition of potassium chlorate (KClO₃) into potassium chloride (KCl) and oxygen (O₂). The balanced equation for this decomposition is:
2 KClO₃(s) 2 KCl(s) + 3 O₂(g)
According to the stoichiometry, 2 moles of KClO₃ produce 2 moles of KCl and 3 moles of O₂. Thus, 1.65 moles of KClO3 will produce:
1.65 moles KClO₃ x (3 moles O₂ / 2 moles KClO₃) = 2.475 moles O₂
Answer: 2.475 moles of O₂ will be formed from 1.65 moles of KClO₃.
Which statement best describes the physical geography of the Italian Peninsula?
It is a flat plain with few hills or mountains.
It is a desert without access to fresh water.
It is a combination of hills, mountains, and plains.
It is mountainous without flat areas for growing crops.
Answer: It is a combination of hills, mountains, and plains
Explanation:
The statement best describes the Italian peninsula, it is a combination of hills, mountains, and plains.
What is the Italian peninsula?It is also known as the Apennines peninsula, and it is extended from the southern Alps to the northern Mediterranean Sea.
It is one of the three greatest peninsulas.
This peninsula was started to be formed in 1861.
Thus, the correct option is C, It is a combination of hills, mountains, and plains.
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What is the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0oC?
the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0oC at 45°C.
Explanation:
Data given:
initial temperature (T)= 25 degrees Celsius
mass of water = 10 gram
cp of water = 4.2J/gram Celsius
energy absorbed (q) = 840 joules
change in temperature = final temperature(t2) - initial temperature (t1)
so ΔT ( t-25)
Using the equation.
q= mcΔT
putting the values in the equation:
840 = 10 x 4.2 x (t-25)
t -25 = [tex]\frac{840}{10 x 4.2}[/tex]
t = [tex]\frac{840}{10 x 4.2}[/tex] +25
= 45 °C
The final temperature of 10 gram of water which absorbed 840 joules of energy at an initial temperature of 25 degrees and final temperature of 45 degrees.
According to specific heat capacity, the final temperature of water is 45°C.
Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
The given values are ,
Q=840 J
m=10 g
c=4.2 J/g°C
T₁=25°C
Substitution of values in the formula gives,
[tex]840=10\times4.2\times(T_2-25)\\84=4.2 T_2-105\\T_2=\dfrac{84+105}{4.2}\\=45^\circ C[/tex]
Thus, final temperature of water is 45°C.
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You make a solution that has 20 molecules of glucose, 210 molecules of hemoglobin, and 770 molecules of water. What is the solute concentration in %?
Answer:
Percentage of water = 2%
Percentage of water = 21%
Percentage of water = 77%
Explanation:
Given data:
Number of molecules of glucose = 20
Number of molecules of hemoglobin = 210
Number of molecules of water = 770
Solution:
To calculate the percentage 1st of all we will determine the total number of molecules.
Total number of molecules = Number of molecules of water + hemoglobin + glucose
Total number of molecules = 770 + 210 + 20
Total number of molecules = 1000
Percentage of water:
Percentage of water = 770/1000 ×100
Percentage of water = 0.77 ×100
Percentage of water = 77%
Percentage of hemoglobin:
Percentage of water = 210/1000 ×100
Percentage of water = 0.21 ×100
Percentage of water = 21%
Percentage of hemoglobin:
Percentage of water = 20/1000 ×100
Percentage of water = 0.02 ×100
Percentage of water = 2%
What are two factors that can affect salinity?
Answer:
precipitation and evaporation
Explanation:
salinity :salt concentration
Precipitation: this brings freshwater into the ocean which are not salty, so it is diluting its salt concentration.
evaporation: takes all the water and leaves the salt behind
calculate the final temperature of 202 mL of water initially at 32 degrees celsius upon absorption of 19 kJ of heat
Answer:
The Final Temperature of water = 54.48°C.
Explanation:
Given,
Volume of water = 202 mL.
Initial Temperature T₁ = 32°C
Heat energy absorbed = 19 kJ = 19000 Joules
Final Temperature T₂ = ?
Final temperature can be calculated using the formula,
Q = (mass) (ΔT) (Cp)
Here ΔT = T₂ - T₁
Cp = specific heat of water = 4.184 J/g°C.
For finding the mass, we use the formula,
Density = Mass/Volume
Since, Density of water = 1 g/mL.
Mass of water = 202 grams.
Now Substituting all values in the formula Q = (mass) (ΔT) (Cp)
19000 = (202)(T₂ - T₁)(4.184)
Solving, we get,
(T₂ - T₁) = 22.48°C
Therefore, T₂ = 22.48°C + 32°C = 54.48°C.
Therefore, Final Temperature of water = 54.48°C.
During an endothermic phase change, what happens to the potential energy and the kinetic energy?
During endothermic phase change, the potential energy of the system always increases while the kinetic energy of the system remains constant. The potential energy of the reaction increases because energy is been added to the system from the external environment.
Explanation:
Those are three distinct methods for demonstrating a specific energy condition of an object. They don't affect one another. "Potential Energy" is a relative term showing a release of possible energy to the environment. If we accept its pattern as the overall energy state of a compound, at that point, an endothermic phase change would infer an increase in "potential" as energy is being added to the compound by the system. A phase change will display an increase in the kinetic energy at whatever point the compound is transforming from a high density to a low dense phase. The kinetic energy will decrease at whatever point the compound is transforming from a less dense to high dense phase.Answer:
d. Potential energy increases, and kinetic energy stays the same.
Explanation:
This is correct on edge.
The answers to the Enthalpy and Phase Changes quiz are:
1. D 25.0 kJ
2. A Delta Hfus
3. C heat of fusion
4. D Potential energy increases, and kinetic energy stays the same.
5. B This is an exothermic reaction that involves freezing.
6. B a thermometer
7. C 549 g
8. B Energy is absorbed, and potential energy increases.
9. D a solid to a liquid
10. C the periodic table
PLEASE HELP FAST IM ABOUT TO FAIL PLEASE HELP PLEASE HELP FAST HELP HELP THIS IS DESPRATE
How many liters of water would be needed to dissolve 21.6 g of lithium nitrate to make a 1.3 M (molar) solution?
What is the molarity of a solution made of 215.1 g of HCl is dissolved to make 2.0 L of solution?
How much concentrated 18 M H[tex]x_{2}[/tex]SO[tex]x_{4}[/tex] is needed to prepare 250.0 mL of a 6.0 M solution?
A chemist has a stock solution of HBr that is 10.0 M and would like to make 450.0 mL of 3.0 M HBr, how would he/she do it?
How much water should be added to 50.0 mL of 12 M hydrochloric acid to make a 4.0 M solution?
Lulu Labwrecker carefully pipeta 25.0 mL of 0.525 M NaOH into a test tube. She places the test tube into a small beaker to keep it from spilling and then pipets 75.0 mL of 0.355 M HCl into another test tube. When Lulu reaches out to put this test tube of acid into the beaker along with test tube of base she accidentally knocks the test tubes together hard enough to break them and their respective contents combine in the bottom of the beaker. Is the solution formed from the contents of the two test tubes acidic or basic? What is the pH of the resulting solution?
1. 0.240 liters of water would be needed to dissolve 21.6 g of lithium nitrate to make a 1.3 M (molar) solution.
2. 2.9 M is the molarity of a solution made of 215.1 g of HCl is dissolved to make 2.0 L of solution.
3.83.3 ml of concentrated 18 M H2SO4 is needed to prepare 250.0 mL of a 6.0 M solution.
4. 135 ml of stock HBr will be required to dilute the solution.
5. 150 ml of water should be added to 50.0 mL of 12 M hydrochloric acid to make a 4.0 M solution
6. The pH of the resulting solution is 13.89
Explanation:
The formula used in solving the problems is
number of moles= [tex]\frac{mass}{atomic mass of one mole}[/tex] 1st equation
molarity = [tex]\frac{number of moles}{volume}[/tex] 2nd equation
Dilution formula
M1V1 = M2V2 3rd equation
1. Data given
mass of Lithium nitrate = 21.6 grams
atomic mass of on emole lithium nitrate = 68.946 gram/mole
Molarity is given as 1.3 M
VOLUME=?
Calculate the number of moles using equation 1
n = [tex]\frac{21.6}{68.946}[/tex]
= 0.313 moles of lithium nitrate.
volume is calculated by applying equation 2.
volume = [tex]\frac{0.313}{1.3}[/tex]
= 0.240 litres of water will be used.
2. Data given:
mass of HCl = 215.1 gram
atomic mass of HCl = 36.46 gram/mole
volume = 2 litres
molarity = ?
using equation 1 number of moles calculated
number of moles = [tex]\frac{215.1}{36.46}[/tex]
number of moles of HCl = 5.899 moles
molarity is calculated by using equation 2
M = [tex]\frac{5.899}{2}[/tex]
= 2.9 M is the molarity of the solution of 2 litre HCl.
3. data given:
molarity of H2SO4 = 18 M
Solution to be made 250 ml of 6 M
USING EQUATION 3
18 x V1= 250 x 6
V1 = 83.3 ml of concentrated 18 M H2SO4 will be required.
4. data given:
M1= 10M, V1 =?, M2= 3 ,V2= 450 ml
applying the equation 3
10 x VI = 3x 450
V1 = 135 ml of stock HBr will be required.
5. Data given:
V1 = 50 ml
M1= 12 M
V2=?
M2= 4
applying the equation 3
50 x 12 = 4 x v2
V2 = 150 ml.
6. data given:
HCl + NaOH ⇒ NaCl + H20
molarity of NaOH = 0.525 M
volume of NaOH = 25 ml
molarity of acid HCl= 75 ml
volume of HCl = 0.335 ml
pH=?
Number of moles of NaOH and HCl is calculated by using equation 1 and converting volume in litres
moles of NaOH = 0.0131
moles of HCl= 0.025 moles
The ratio of moles is 1:1 . To find the unreacted moles of acid and base which does not participated in neutralization so the difference of number of moles of acid minus number of moles of base is taken.
difference of moles = 0.0119 moles ( NaOH moles is more)
Molarity can be calculated by using equation 1 in (25 +75 ml) litre of solution
molarity = [tex]\frac{0.0119}{0.1}[/tex]
= 0.11 M (pOH Concentration)
14 = pH + pOH
pH = 14 - 0.11
pH = 13.89
A box rests on a table. What forces act on the box?
OA) a pulling force only
O B) a pushing force only
OC) both a pulling and a pushing force
Answer:
c both
Explanation:
the table is pushing up so the pushing force and gravity is the pulling force as its pulling it towards the ground