Summer Stoich 1 Study Guide

Conceptual

100

What do you call the substances that react together to form a new substance in a chemical reaction?

a) Reactant

b) Product

c) Coefficient

d) Subscript

A

200

How many atoms are in 1 mole?

6.022 x 10²³ atoms

300

Which of these is FALSE about the law of conservation of mass?

a) Mass cannot be created or destroyed

b) Mass of reactants must equal the mass of products

c) Law of conservation of mass is the reason chemical reactions must be balanced on both sides

d) The mass of the products is always double the mass of the reactants

D

400

Is the following reaction balanced or unbalanced?

Zn +  Cl₂ → ZnCl₃

Unbalanced 

500

Fill in the missing data below according to the law of conservation of mass: Na + Cl -> NaCl

Na = 12 g

Cl = ?

NaCl = 30 g

18 g

Convert

100

To convert moles to atoms, what unit must go at the BOTTOM of your conversion factor fraction?

a) gram

b) atoms

c) particle

d) mol

D

200

How many moles is 5.19 x 10²⁴ atoms of Titanium (Ti)?

Round to the nearest 0.1 and include the correct unit.

8.6 mol 

300

How many moles is in 32.89 grams of fluorine gas (F₂)? Round to the nearest 0.01 include the correct unit.

0.87 mol 

400

How many grams is 2.09 moles of Mercury Oxide whose formula is HgO₂?

Round to the nearest 0.1 include the correct unit.

486.1 g 

500

Sally has a sample of 0.37 moles of silver (Ag). How many atoms of silver is this? Round to the nearest 0.01 include the correct unit.

2.25 x 10²³ atoms 

Balancing

100

How many nitrogens are in NO₃

1

200

How many carbons are in 2C₄H₆O₂ ?

8

300

How many oxygens are on the REACTANT side of this chemical reaction?

H₂ + O₂ -> H₂O

2 (reactants are on the left, products are on the right)

400

Balance the reaction

____ H₂ + ____ S₂ → ____ H₂S

___2_ H₂ + __1__ S₂ → __2__ H₂S

500

What coefficients would go in the following blanks to balance this reaction

____ K₂O + ____ CsBr → ____ KBr + _____ Cs₂O

1, 2, 2, 1

Molar Mass

100

Molar mass is the mass of ...

a) 1 atom of substance

b) 1 mol of substance

c) 1 gram of substance

d) 1 dozen of substance

b

200

What is the molar mass of O₂

32 g

300

What is the molar mass of CO₂ 

INCLUDE THE CORRECT UNIT FOR POINTS

44.01 g

12.01 + 16.00(2)

400

What is the molar mass of MgN₂O₆

INCLUDE THE CORRECT UNIT FOR MASS

148.33 g

24.31 + 14.01(2) + 16.00(6)

500

Which of these is FALSE

a) Molar mass is the mass of 1 mol

b) Molar mass is the mass of 6.022 x 10²³ atoms

c) Molar mass is the mass of 1 atom

d) Molar mass is found using the periodic table

C