Explanation:
The mass number of an element's atom is gotten by adding the number of protons and neutrons of the atom. Electrons have negligible mass compared to the protons and neutrons hence do not matter. The mass of a nuclear particle ( protons and the neutrons) is based on the 1/12 mass of carbon which is used as the standard for getting the mass of other elements.
If an element has isotopes the relative mass of the element is gotten by adding all the atomic mass numbers of the isotopes and dividing the sum by the number of isotopes.
a chemist measured 75.00g of HCL into a volumetric flask and added water until the volume was 1.000 L. what is the molarity of the resulting hydrochloric acid solution?
Answer: M = 2.08 M
Explanation: Molarity is expressed as the number of moles per unit volume in liters. First convert the mass of HCl to moles using its molar mass. Then substitute the variables to the formula for molarity.
75.00 g HCl x 1 mole HCl / 36 g HCl
= 2.08 moles HCl
For Molarity.
M = n / L
= 2.08 moles HCl / 1.000 L
= 2.08 M
Which of these mixtures could be most easily separated by filtration ?
Explanation:
Filtration is a separation procedure where a mixture is gone through a filter that permits one segment to go through uninhibited yet hinders another segment from going through. We can utilize filtration to isolate a mixture of a solid in a fluid or a solid in a gas. When all is said in done this technique sorts by size, with the filter going about as a barrier that permits littler particles to experience, however, holds bigger particles back. Filtration works best when the solute isn't dissolved in the solvent. For example, sand and water can be separated through filtration as the two mixes don't dissolve up with one another. In any case, sugar and water would not be separated through filtration as they break down with one another.A reaction will occur when CaCl2 is combined with _______. A) F2 B) N2 C) Br2 D) I2
Answer:
A reaction will occur when CaCl2 is combined with F2.
Explanation:
Let us know the terms at first.
Ca- Calcium
Cl2- Chloride, therefore CaCl2 is Ca+ Cl2 and that is calcium chloride.
Now, F2 is fluorine which is a yellow compressed gas.
When CaCl2 combines with F2, it gives out products like CaF2 or calcium fluoride, which is a white crystalline solid in powder form, and Cl or chlorine, which appears as a greenish-yellow compressed liquid gas with a pungent smell.
Here is the equation,
CaCl2+ F2= CaF2+ Cl.
Final answer:
A reaction occurs when CaCl2 is combined with F2, resulting from fluorine's higher reactivity which allows it to displace chlorine in a single-replacement reaction.
Explanation:
A reaction will occur when CaCl2 is combined with F2. This is due to the fact that in the context of a single-replacement reaction, a more reactive halogen (in this case, fluorine) can displace a less reactive halogen (like chlorine in CaCl2) from its compound. The example provided in the supporting information illustrates a similar scenario where the reactivity of fluorine above bromine on the periodic table allows for the replacement to occur, yielding products such as CaF2 and Br2. Therefore, fluorine (F2) is the correct answer.
What is the molality of a solution when 0.50 moles glucose is dissolved in 750 g of water?
Answer:
0.67mol/Kg
Explanation:
The following were obtained from the question:
Mole of solute = 0.50mol
Mass of solvent = 750g = 750/1000 = 0.75Kg
Molality =?
Molality = mole of solute /mass of solvent
Molality = 0.5/0.75
Molality = 0.67mol/Kg
There are many different natural resources found in Florida. Florida's climate is warm
and humid with an abundance of solar energy. The state is surrounded by ocean
water and has fertile soil great for farming fruits and vegetables. Half of Florida sana
is covered by trees, ideal for wildlife habitats and the production of paper products.
Florida has a rich source of mineral deposits including: limestone, phosphate and
silicon deposits. Florida is also a source of natural gas and oil.
Which of the following is a nonrenewable resource found in the State of Florida?
C. Phosphate is the non renewable resource found in the state of Florida.
Explanation:
There are so many things made from the non renewable resource, phosphate found in the state of Florida.
It is used in the large scale preparation of fertilizers, that is supplied to the world wide farmers and small amount of the phosphate is utilized to manufacture some of the supplements like soft drinks, tooth paste and vitamins.
Both gas and oil are also non-renewable, since it takes an ample amount of time to regenerate.
A change in state is a physical change.
True or false
Answer: Depending on the state of change it can be a physical change. Example: Evaporation is the physical change of a liquid turned into a gas.
That said, I'm pretty sure the answer is (True)
Note: Hope this is correct and it helps. Good luck :)
Determine the length with accuracy and correct degree of precision. 12.48 cm, 12.5 cm, 2.10 cm,12 cm
Answer:
12 is the length with accuracy and correct degree of precision.
Explanation:
Answer:
12 cm
That's your answer!!
The purpose of controlling an experiment is to _____. A. double-check your own work B. compare one theory to another theory C. prevent the question from being testable D. make sure the results of the experiment are useful
D
Make sure the results of the experiment are useful
Explanation:
In an experiment, certain variables (independent variables) are controlled to check how they affect other variables (dependent variables) and understand the relationship between them. Also, these experiments usually have a control experiment, of no change, to help compare results and increases their reliability.
How does the process of cellular respiration create energy?
Answer:
well, through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP
Answer:
Oxygen is mixed with certain chemicals in a plant to make Carbon Dioxide and then the plant uses that to eat. So even if humans disappeared plants could still survive.
Explanation:
Select all that reasons that the reaction contents does not conduct at this low point.
There are too few cations from the base available (Ba+2).
There are too few anions from the acid available (SO4-2).
The water molecules formed are neutral.
It's all three of the answers
Answer:
All of these will be correct, so check-box all of them.
Explanation:
Can i please have brainliest?
How does the position of a constellation change seasonally? Choose the two correct answers.
A.
It shifts from west to east.
B.
It shifts from east to west.
C.
It rotates around Earth.
D.
It revolves around the sun.
E.
It may be higher in the sky during winter.
Answer:
C,A
Explanation:
Answer:
c and a
Explanation:
Calculate the mass of Cu deposited by the electrolysis of CuCl2 at 4A for 40 minutes.
Answer:
3.16g
Explanation:
Data obtained from the question include:
I = 4A
t = 40mins = 40 x 60 = 2400secs
Q =?
Q = It
Q = 4 x 2400
Q = 9600C
Now let us generate a balanced half equation to determine the number faraday needed to deposit metallic Cu. This is illustrated:
Cu^2+ + 2e —> Cu
From the equation,
2 faraday is needed to deposit metallic cu
1 faraday = 96500C
Therefore 2 faraday = 2 x 96500 = 193000C
Molar Mass of Cu = 63.5g/mol
193000C deposited 63.5g of Cu
Therefore, 9600C will deposit = (9600 x 63.5)/193000 = 3.16g of Cu
can you answer this for me
Answer:
Algebra is an area in mathematics that uses variables, in the forms of letters and symbols, to act as numbers or quantities in equations and formulas. Geometry is an area in mathematics that studies points, lines, varied-dimensional objects and shapes, surfaces, and solids.
Explanation:
It is your own opinion on which is more difficult. In my opinion, Geometry is more difficult.
Answer: I believe they want you to know the variables; and Newton described what? Force, action, mass.
I think you should read the Laws, and see how the variables, those important pieces, are shown in an equation. That will be of real help to you. Get the very basics down in your head (and on paper), and it will be much easier!
Explanation:
01:44:44
If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what
would happen to the pressure of the gas?
O
It would increase.
It would be halved.
It would stay the same
It would slightly decrease
Mark this and retum
Save and Exit
The pressure of the gas would increase.
Explanation:
Using the ideal gas formulae we can evaluate this fact;
P₁V₁/T₁ = P₂V₂/T₂
We can assume that the volume is reduced by half (the T₁ and T₂ will cancel out because they remain constant);
P₁V₁ = P₂ * 0.5V₁
P₁V₁/0.5V₁ = P₂
P₁/0.5 = P₂
You can observe that the pressure will also increase – diving a number by a fraction or decimal number increases the resultant value. In this case, the pressure will increase by 2 fold
Hydrogen gas (H2) and oxygen gas (O2) react to form liquid hydrogen peroxide (H2O2). Which statement is true about the reaction?
A.
The same atoms are present, so the chemical properties are the same.
B.
The atoms of the reactants have combined to form a new substance.
C.
The two gases have mixed together, but a new substance has not formed.
D.
The product that is formed has the same physical properties as the reactants.
Answer:
B. The atoms of the reactants have combined to form a new substance.
Explanation:
When hydrogen and oxygen gas combined they form hydrogen peroxide. This is happen through chemical reaction so a new substance is formed. The state of reactant is also different, reactants are present in gaseous form while product is present in liquid form. So option b is correct.
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H 2 (g) + O 2 (g) -------------------------------------> H2O2 (l)
Explanation: The chemical reaction has combined the atoms of hydrogen gas and the atoms of oxygen gas to form a new substance. Since hydrogen peroxide is a different substance, it has different chemical and physical properties. All chemical reactions produce new substances with different chemical and physical properties than the reactants.
For an element such as sodium, how many ionization energies are there?
Answer:
Sodium has 496KJ/mol ionization energy.
Explanation:
Ionization energy is the process in which electron which is present in the outermost shell is removed with the absorption of energy by the electron. Different atoms have different ionization energies. When we go from left to the right in the periodic table, ionization energy increases due to atomic size decrease. When we go from top to bottom in the periodic table, ionization energies decreases due to increase the atomic size. Sodium has 496KJ/mol ionization energy which means the outermost electron needs 496KJ/mol energy for removal.
Final answer:
Sodium, with atomic number 11, has 11 ionization energies, each corresponding to one of its 11 electrons. The first ionization energy involves removing the loosely held valence electron, resulting in the formation of a sodium ion (Na+). Each subsequent ionization energy is higher due to greater electrostatic attraction after each electron removal.
Explanation:
For an element such as sodium, the number of ionization energies corresponds to the number of electrons an atom has, which is 11 for sodium. Each removal of an electron from an atom requires more energy than the last due to the increased electrostatic attraction between the remaining electrons and the nucleus. This means for sodium there are 11 ionization energies, each removal corresponding to one of sodium's electrons - starting with the outermost electron, which is in the 3s orbital.
The first ionization energy is typically the smallest because it involves removing the most loosely held electron. As you proceed to remove more electrons, the ion becomes more positively charged and the remaining electrons are more strongly attracted to the nucleus. Hence, each successive ionization energy is greater than the previous one, often with a significant jump observed when starting to remove core electrons that are closer to the nucleus and more tightly bound.
The alkali metal sodium, with atomic number 11, has an electronic configuration of [Ne]3s¹. This 3s electron is the valence electron and is the easiest to remove. Once this electron is removed, sodium becomes a sodium ion (Na+) with a +1 charge.
A piece of copper has a temperature of 73.6 C. When the metal is placed in 96.2 grams of water at 17.1 C, the temperature rises by 5.1 C. What is the mass of the metal?
Answer:
103.8 g
Explanation:
When the hot piece of copper is placed in the water at lower temperature, the piece of copper gives off thermal energy to the water; as a result, the temperature of the copper decreases while the temperature of the water increases, until they both reach the equilibrium temperature.
The heat given off by the piece of copper is equal to the heat absorbed by the water, so we can write:
[tex]Q_c=Q_w[/tex]
where:
[tex]Q_w=m_w C_w \Delta T_w[/tex] is the heat absorbed by the water, where
[tex]m_w = 96.2 g[/tex] is the mass of water
[tex]C_w=4.186 J/gC[/tex] is the specific heat of water
[tex]\Delta T_w=5.1C[/tex] is the rise in temperature of the water
Solving,
[tex]Q_w=(96.2)(4.186)(5.1)=2053.7 J[/tex]
[tex]Q_c=m_c C_c (T_c-T)[/tex] is the heat released by the copper, where
[tex]m_c[/tex] is the mass of copper
[tex]C_c=0.385 J/gC[/tex] is the specific heat of copper
[tex]T_c=73.6C[/tex] is the initial temperature of copper
[tex]T=17.1C+5.1C=22.2 C[/tex] is the equilibrium temperature
Solving for the mass,
[tex]m_c=\frac{Q_c}{C_c(T_c-T)}=\frac{2053.7}{(0.385)(73.6-22.2)}=103.8 g[/tex]
The correct answer is the mass of the copper piece is approximately 16.3 grams.
To solve this problem, we can use the principle of conservation of energy, which states that the heat lost by the copper will be equal to the heat gained by the water.
The heat transfer can be calculated using the formula:
[tex]\[ q = mc\Delta T \][/tex]
For the copper piece, the heat lost is given by:
[tex]\[ q_{copper} = m_{copper}c_{copper}(T_{final} - T_{initial,copper}) \][/tex]
For the water, the heat gained is given by:
[tex]\[ q_{water} = m_{water}c_{water}(T_{final} - T_{initial,water}) \][/tex]
Since the heat lost by the copper is equal to the heat gained by the water, we can set the two equations equal to each other:
[tex]\[ m_{copper}c_{copper}(T_{final} - T_{initial,copper}) = m_{water}c_{water}(T_{final} - T_{initial,water}) \][/tex]
Given that [tex]\( T_{final} \)[/tex] is the temperature of the water after the copper is added plus the temperature rise:
[tex](17.1C + 5.1C = 22.2C), \( T_{initial,copper} \) is 73.6C, and \( T_{initial,water} \) is 17.1C,[/tex]we can plug in the values:
[tex]\[ m_{copper}(0.385)(22.2 - 73.6) = (96.2)(4.184)(22.2 - 17.1) \][/tex]
Now, we solve for [tex]\( m_{copper} \)[/tex]:
[tex]\[ m_{copper} = \frac{(96.2)(4.184)(22.2 - 17.1)}{(0.385)(22.2 - 73.6)} \] \[ m_{copper} = \frac{(96.2)(4.184)(5.1)}{(0.385)(-51.4)} \] \[ m_{copper} = \frac{(96.2)(4.184)(5.1)}{(0.385)(-51.4)} \] \[ m_{copper} \approx \frac{(96.2)(4.184)(5.1)}{(-20.163)} \] \[ m_{copper} \approx -16.3 \text{ grams} \][/tex]
Since mass cannot be negative, the negative sign indicates a direction in heat transfer (the copper loses heat), but the magnitude of the mass is what we're interested in.
Therefore, the mass of the copper piece is approximately 16.3 grams.
define the vocabulary term , density ?
Answer:
density is defined as the ratio of mass to volume of a object
Answer:
The term density can be defined as the mass per unit volume of a substance.
Explanation:
The term density can be defined as the mass per unit volume of a substance.
The mathematical expression for density;
[tex]{Density P}=\frac{\text{Mass M}}{\text{Volume V}}[/tex]
The symbol for density is P, pronounced as "rho".
Also, the SI unit for measuring density is kg/m³.
The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases.
Compare heat vs. temperature
Answer:
See the answer beloew, please.
Explanation:
The concepts of heat and temperature are related, but they are not the same. Temperature refers to a physical quantity which indicates the amount of heat. The latter corresponds to the energy that moves from one body to another, thus being able to raise or lower the temperature.
Final answer:
Heat refers to the transfer of thermal energy, measured in joules, while temperature measures the kinetic energy of particles, observed via a thermometer. Temperature influences chemistry by affecting states of matter and reaction rates.
Explanation:
Many often confuse heat with temperature, yet they refer to different aspects of thermal energy. Temperature is a measure of the average kinetic energy of the particles in a substance and is what we measure with a thermometer. On the other hand, heat is the transfer of thermal energy due to a temperature difference between objects. It is a form of energy flow from a warmer object to a cooler one and is measured in joules or calories. A high temperature might make us feel 'hot', but it is the flow of heat to or from our bodies that we truly sense.
Temperature plays a critical role in chemistry; it affects the state of matter and the rate of chemical reactions. For instance, when ice turns into water, it is because of an increase in temperature. Similarly, many chemical reactions speed up with higher temperatures, and keeping unstable materials like enzymes at lower temperatures can prolong their stability.
Please show full working out 50 points :)
Answer:
The answer is-2168kj/mol
Explanation:
Formula is product-reactant
Product is B2O3+3H2O
B2O3=-1274kj/mol
3H2O=3(-286)=-858kj/mol
Reactant is B2H6
B2H6=36kj/mol
Product-reactant=-858-1274-36
=-2168kj/mol
Answer:
first you subtract then you divide the equation an the you get your ansewe
Explanation:
Which factor most directly affects potential energy?
Answer:
Mass, gravitational force and height
Explanation:
Potential energy of body is the energy at rest in a body and it depends on the mass, acceleration due to gravity and height of a body;
Potential energy = mass x gravity x height = mgh
The more the mass, gravity and height of a body, the higher the potential energy a body will posses. This is why a stone at a height has more potential energy than one on the ground.
Describe the energy transformation when a match burns.
Your answer should include at least 2 complete sentences.
ASAP help with these please.
Answer:
1. See explanation below
2. Density
3. Masses
Explanation:
1. Your picture is a bit too small to see the values but maybe this will help you.
To determine the maximum maximum mass in grams that triple beam balance can measure all you have to do is add up the maximum of each beam. So all you need to do is see the value at the last notch of each beam.
However, if you are referring to the picture that is attached in the bottom: The answer would be 610g. Because the last notches of each beam are as follows:
100 g
500 g
10 g
So we add that we get 610g.
2. density can be computed using the formula:
D = M/V
where:
D = density
M = mass
V = volume
As you can see in the both figures A and B measure 20 g, this means that their masses are the same. The density of objects can be different when either their masses, or their volumes are different. So even if they have the same mass, they can have different densities because they have different volumes.
3. Force of gravitational attraction between two objects is dependent on the masses of the two objects and the distance. The larger the mass, the stronger the gravitational force of attraction. This means that they have a direct relationship. Now when it comes to distance, the further apart they are the weaker the gravitational force of attraction, or in other words, they are indirectly related.
which changes can reach dynamic equilibrium
A- nuclear only
B- chemical only
C- nuclear and physical
D - chemical and physical
Answer:
D - chemical and physical
Explanation:
Only chemical and physical changes can reach the level of dynamic equilibrium. Nuclear reactions cannot reach dynamic equilibrium.
A system is in dynamic equilibrium when the rate of forward reaction is the same as that of backward reaction in a reversible reaction. Nuclear reactions cannot be reversed. Dynamic equilibrium is prominent in chemical reactions. It is commonly found that as a reaction occurs, the backward and forward reactions can reach equilibrium levels. In physical changes, this can also occur when certain conditions of pressure and temperatures are satisfied.a helium balloon contains 0.46g off helium. how many moles of helium does it contain?
(0.48 gram) x (1mole / 4.0 gram) = 0.48/4.0 = 0.12 mole
Mole measure the number of elementary entities of a given substance that are present in a given sample. The mole of helium gas is 0.115 mole.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to the molar mass of a substance and directly proportional to the given mass of that substance.
Mathematically,
mole of helium gas =given mass of helium ÷ molar mass of helium gas
Molar mass of helium=4 g/mol
Mass of helium = 0.46g
Substituting the values in above formula we get
Mole of helium gas = 0.46g÷ 4 g/mol
Mole of helium gas = 0.115 mole
Therefore, the mole of helium gas is 0.115 mole.
To know more about mole, here:
https://brainly.com/question/15209553
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The reaction for the decomposition of ammonia can be written as shown below. If a student starts with 21.7 g of ammonia how many grams of hydrogen gas will be produced by the reactions?Why
2NH3 = N2 + 3H2
A. 1.28g
B. 2.55g
C. 3.85g
D. 32.5g
Answer:
Option C. 3.85g
Explanation:
2NH3 <=> N2 + 3H2
Molar Mass of NH3 = 14.0067+ (3x1.0078) = 14.0067 + 3.02352 = 17.03022g/mol
Mass of NH3 from the balanced equation = 2 x 17.03022 = 34.06044g
Molar Mass of H2 = 2x1.00784 = 2.01568g/mol
Mass of H2 from the balanced equation = 3 x 2.01568 = 6.04704g
From the equation,
34.06044g of NH3 produced 6.04704g of H2
Therefore, 21.7 of NH3 will produce = (21.7 x 6.04704)/34.06044 = 3.85g of H2
A ball has a volume of 5.27 liters and is at a temperature of 27.0°C. A pressure gauge attached to the ball reads 0.25 atmosphere. The atmospheric pressure is 1.00 atmosphere.
Calculate the absolute pressure inside the ball and the amount of air it contains.
The absolute pressure inside the ball is ??? atmospheres
The ball contains ???mole of air
The absolute pressure inside the ball is 1.25atm.
Explanation:
Given-
Volume, V = 5..27L
Temperature, T = 27°C
Gauge Pressure, Pg = 0.25 atm
Atmospheric pressure, Patm = 1 atm
Absolute pressure, Pabs = ?
We know,
[tex]Pabs = Pg + Patm\\\\\\Pabs = 0.25 + 1 atm\\\\Pabs = 1.25atm[/tex]
Therefore, absolute pressure inside the ball is 1.25atm.
Answer:
The absolute pressure inside the ball is 1.25 atmospheres.
The ball contains 0.267 mole of air.
Explanation:
im typing this to trick the algorithm but yeah that's right lol
How can I find the solution needed for amount of reaction?
Answer:
0.48L of NaOH
Explanation:
Data obtained from the question include:
Number of mole of NaOH = 0.725mol
Molarity of NaOH = 1.50M
Volume of NaOH =?
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 0.725/1.5
Volume = 0.48L
Therefore, 0.48L of NaOH is needed for the reaction
Convert 7.50 grams of glucose C6H12O6 to moles
Answer:
The number of mole is 0.04167mole
Explanation:
To convert gram to mole, we need to calculate the molecular weight of the compound
C6H12O6
C - 12
H - 1
O - 16
Molecular weight = 6 * 12 + 1 *12 + 6 * 16
= 72 + 12 + 96
= 180g/mol
To covert gram to mole
Therefore,
= 7.50g/ 180g/mol
= 0.04167 mole of glucose
What powers the lights of the vampire squid ?
A.The sun
B.Bacteria
C.Phosphorous
Final answer:
The vampire squid's lights are powered by bacteria called Vibrio fischeri.
Explanation:
The vampire squid possesses bioluminescent organs called photophores that enable it to produce light. These photophores are powered by bacteria called Vibrio fischeri which live symbiotically within the squid's light organs. The bacteria produce an enzyme called luciferase that acts on a substrate called luciferin, resulting in the emission of light.