Class Activity

Naming Polyatomic Acids

100

What is the name of the acid formed from the chloride ion (Cl-)?

Hydrochloric Acid

200

What is the name of the acid with the formula HNO₂?

Nitrous Acid

300

What is the chemical formula for phosphoric acid?

H₃PO₄

400

What is the name of the acid formed from the phosphate ion?

Phosphoric Acid (PO₄^3-)

500

What is the name of the acid formed from the sulfite ion?

Sulfurous Acid (SO₃^2-)

Stoichiometry

100

In the reaction N₂(g) + 3H₂(g) -> 2NH₃(g), how many moles of hydrogen gas (H₂) are needed to react completely with 1 mole of nitrogen gas (N₂)?

3 moles

200

What mass of water (H₂O) is produced when 4 grams of hydrogen gas (H₂) react completely with excess oxygen gas (O₂)? (Atomic masses: H=1 g/mol, O=16 g/mol)

36 grams

300

How many moles of oxygen gas (O₂) are needed to produce 2 moles of carbon dioxide (CO₂) in the complete combustion of methane (CH₄)?

4 moles

400

How many grams of oxygen gas (O₂) are required to completely react with 10.0 grams of hydrogen gas (H₂) to form water (H₂O)? (Atomic masses: H=1.01 g/mol, O=16.00 g/mol)

79.2g O₂

500

When 10.0 grams of calcium carbonate (CaCO₃) are heated, they decompose completely according to the following equation. What mass of calcium oxide (CaO) is produced?

(Atomic masses: Ca= 40 g/mol, C= 12 g/mol, O=16 g/mol)

CaCO₃(s) -> CaO(s) + CO₂(g)

5.6 grams

Balancing Chemical Equations

100

_K + _MgBr -> _KBr + _Mg

K + MgBr -> KBr + Mg

200

_Xe + _F₂ -> _XeF₆

Xe + 3F₂ -> XeF₆

300

_H₂ + _O₂ -> _H₂O

H₂ + O₂ -> 2H₂O

400

_Al + _HCl -> _H₂ + _AlCl₃

2Al + 6HCl -> 3H₂ +2AlCl₃

500

_C₃H₈ + _O₂ -> _CO₂ + _H₂O

C₃H₈ + 5O₂ -> 3CO₂ +4H₂O

Limiting Reagents

100

Define what a limiting reagent is in a chemical reaction.

The limiting reagent is the reactant that is completely consumed first in a chemical reaction, thereby limiting the amount of product that can be formed. 

200

If you have 10 moles of A and 15 moles of B, and they react in a 1:2 ratio (A+2B -> C), which is the limiting reagent?

A is the limiting reagent

300

In the reaction 2H₂ + O₂ -> 2H₂O, if you have 5 grams of oxygen, which is the limiting reagent?

Hydrogen (H₂)

400

How many grams of water can be produced from 10 grams of hydrogen and 20 grams of oxygen?

22.5 grams of water

500

If 10.0 grams of aluminum powder are mixed with 25.0 grams of iron(III) oxide and ignited, which reactant is the limiting reagent?

2Al(s) + Fe₂O₃(s) -> Al₂O₃(s) + 2Fe(l)

Aluminum (Al) is the limiting reagent