CHEMISTRY HIGH SCHOOL

Entropy measures _____.a. disorder
b. energy
c. heat transferred
d. force

Answers

Answer 1
Answer: a. disorder

Good luck!

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Identify the following as True or False? 1. The limiting reactant is the reactant that is completely consumed in a chemical reaction. 2. The reactant in excess is any reactant that occurs in a quantity greater than that is required to completely react with the limiting reactant. 3. The amount of product can be calculated based on the amount of limiting reactant.
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A substance has a mass of 360 g and a volume of 7.5 cm3. What is its density?a. 2700 g/cm3 c. 480 g/cm3 b. 270 g/cm3 d. 48 g/cm3
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Fe2O3+2Al=Al2O3+2Fe A welder has 1.873 × 10^2 g Fe2O3 and 94.51 g Al in his welding kit. Which reactant will he run out of first? (options: Fe2O3 or Al.......it's Fe2O3). How much of this reactant should he order to make sure he runs out of both reactants at the same time? He should order ___g of the limiting reactant.

Answers

Answer: a) Fe_2O_3

b) 92.1 g

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

a) moles of Fe_2O_3

\text{Number of moles}=(1.873* 10^2 g)/(159.69g/mol)=1.173moles

b) moles of Al

\text{Number of moles}=(94.51g)/(27g/mol)=3.500moles

Fe_2O_3+2Al\rightarrow Al_2O_3+2Fe

According to stoichiometry :

1 mole of Fe_2O_3 require 2 moles of Al

Thus 1.173 Cl_2 require=(2)/(1)* 1.173=2.346moles  of Al

Thus Fe_2O_3 is the limiting reagent as it limits the formation of product. Thus Fe_2O_3 will run out first.

Al is the excess reagent as (3.500-2.346)= 1.154 moles are left unreacted.

2 moles of Al require 1 mole of Fe_2O_3

3.500 moles of Al require= (1)/(2)* 3.500=1.750moles of Fe_2O_3

Moles of Fe_2O_3  required = (1.750-1.173) = 0.577

Mass of Fe_2O_3=moles* {\text {Molar mass}}=0.577moles* 159.69g/mol=92.1g

Thus he should order 92.1 g of the limiting reactant.

Answer:

92.41g

Explanation:

Copper has a density of 8.920 g/cm3. What mass of copper will occupy 45cm3? What volume of copper will have a mass of 1.0 kg?

Answers

density = mass/volume
so rearranged mass = volume x density
mass = 8.920 x 45 = 401.4g

rearrange   (there are 1000grams in 1kg)
volume = mass/density
volume = 1000/8.920
volume = 112.1076233cm3

Which compound is an exception to the octet rule

Answers


I think it's RbCl and CaO

D. CIF3

got it correct on test <3

What is the formula for salt used for the green light in the fireplace

Answers

Hello R2o4!

The formula of salt used for green light is BaCl2
Cheers!
-Blizzard

Which belief is the basis of Ptolemy's geocentric model of the solar system?

Answers

Answer:

"Earth-centered," or "geocentric" Ptolemy thought that all celestial objects — including the planets, Sun, Moon, and stars — orbited Earth. Earth, in the center of the universe, did not move at all.

Explanation:

Answer:

Geocentric

Explanation:

Its the belief that earth was the center of the solar system instead of the sun

What similarities do nuclear energy and chemical energy share?

Answers

atoms can be the source of both nuclear and chemical energy. Nuclear energy involves the atom's nucleus; chemical energy involves the atom's electrons—subatomic particles that surround the nucleus.

Both are types of potential energy, and Involve stored energy.  
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