Chemistry Conceptual Final

Moles

100

What is Avogadro's number?

What is 6.02 x 10²³ particles?

200

What is number of moles in 6.1 grams of nitrogen gas?

What is 0.22 g N₂?

300

What is number of grams of 1.75 mol of helium gas?

What is 7.00 grams He?

400

What is the molar mass of magnesium nitrate?

What is 148.313 g/mol Mg(NO₃)₂?

500

What is the mass of 2.34 x 10²⁴ molecules of cobalt (II) chloride?

What is 505 g CoCl₂?

Nuclear Chem

100

Identify the number of protons, electrons, and neutrons in the following:

¹⁴N^-3

What is:

7 protons

7 neutrons (14-7)

10 electrons (7 - 10 = -3)

200

Determine the n:p ratio of the following and if it is stable or unstable.

Eu-151

What is 

63 protons

88 neutrons

n:p = 1.4, stable

300

Balance the equation.

___  -->   ⁴₂He  +   ²⁰⁶₈₂Pb

What is ²⁰⁸₈₄Po?

400

How long does it take a 100.00g sample of As-81, with a half-life of 33 seconds, to decay to 6.25g?

100 - 50 - 25 - 12.5 - 6.25

4 half-lives, 4 x 33 = 132 seconds

500

Does fusion or fission describe each of the following:

a) occurs in the sun

b) splitting of the atom

c) turning mass to energy

What is

a)  fusion

b)  fission

c)  both

Gases

100

As temperature increases at fixed volume, what happens to pressure?  Explain using Kinetic molecular theory.

Pressure increases 

As temperature increases, atoms have more energy and hit the walls more forcefully.  This increases the pressure.

200

Would a balloon filled with argon or helium shrink faster?  Explain.

Is this diffusion or effusion?

Effusion.

Helium balloon will shrink faster because they are smaller atoms.

300

Convert 75 ^oC to Kelvin.

348 K

400

If you have 2.4 moles of gas held at a temperature of 370 K in a 45 L container, what is the pressure of the gas?

What is 1.61 atm?

500

Which scientist related temperature and volume? 

Who is Charles?

Reactions

100

Balance:

___Fe + ___O₂ --> ___Fe₂O₃            

2, 3, 2

200

What type of reaction is it?

___Fe + ___O2 -> ___Fe2O3            

synthesis

300

Balance

___H₃PO₄ + ___KOH -->___K₃PO₄ + ___H₂O

1, 3, 1, 3,

400

What type of reaction?

___H₃PO₄ + ___KOH -->___K₃PO₄ + ___H₂O

Double replacement, acid-base

500

Write the chemical equation.

Aqueous dihydrogen dioxide breaks down into water vapor and oxygen gas.

H₂O₂ (aq) --> H₂O (g) + O₂ (g)

Naming

100

What is the name of NaOH?

What is sodium hydroxide?

200

What is the formula of iron (IV) carbonate?

What is Fe(CO₃)₂?

300

What is the name of PO₃ ?

What is phosphorus trioxide?  (Covalent)

400

What is the formula for dinitrogen pentasulfide?

What is N₂S₅? (Covalent)

500

What is the formula for cobalt (II) phosphate?

What is Co₃(PO₄)₂?