Stoichiometry

Names and Terms

100

_________ are the species present before the reaction.

Reactants

200

A __________ tells us the materials needed and the products formed in a chemical reaction. It also represents the sentence in the language of chemistry. This communicates a chemical change using symbols and formulas to represent the elements and compounds involved in a chemical reaction.

Chemical equation

300

_________ are numbers used to balance a chemical equation.

Coefficients

400

This area of chemistry examines the quantities of substances consumed and produced in chemical reactions.

Stoichiometry

500

A _______ is defined as the amount of a substance that contains 6.02 x 10E23 particles.

Mole

Balancing Chemical Equations

100

Balance the following equation: N2 + O2 → N2O5. What is the coefficient of N2O5?

(2 N2 + 5 O2 → 2 N2O5)

200

Magnesium chloride (MgCl) and sodium hydroxide (NaOH) react to form magnesium hydroxide Mg(OH)2 and sodium chloride (NaCl). What is the balanced chemical equation for this reaction?

MgCl2 + 2 NaOH → Mg(OH)2 + 2 NaCl

300

Copper (II) sulfate reacts with Zn metal to produce Cu metals and Zinc sulfate. What is the balanced chemical equation for this reaction?

CuSO4 + Zn → Cu + ZnSO4

400

Hydrogen gas and chlorine gas react to form Hydrochloric Acid (HCl). What is the balanced chemical equation for this reaction?

H2 + Cl2 → 2 HCl

NOTE: Hydogen gas and chlorine gas are diatomic molecules.

500

What is the coefficient of O2 after balancing the following equation: C2H6 + O2 → H2O + CO2

7

(2 C2H6 + 7 O2 → 6 H2O + 4 CO2)

Chemical Reactions

100

What type of reaction is...

CH4 +2O2 -> CO2 + 2H2O

Combustion Reaction

200

Reaction that breaks down compounds

Decomposition reaction

300

What type of reaction is this?

CaI2 (s) + Cl2 (g) → CaCl2 (s) + I2 (s)

Single-Displacement reaction

400

What kind of reaction is this ?
Na2SO4 (aq) + SrCl2 (aq) → SrSO4 (s) + 2 NaCl (aq)

Double-Displacement Reactions

500

What would you call when a solid salt dissolves, the (+) ends of water molecules

associate with the anion, and the (-) ends of water molecules associate with the cation

Ionic equation

Mass, Moles and Molar Mass

100

What is the molar mass of ammonium carbonate, (NH4)2CO3?

96.09 g/mol

200

What is the mass of 9.2 x 10E-4 mol of Argon?

0.037 g Ar

300

What is the mass of 0.443 moles of hydrazine, N2H4?

14.2 g

400

How many moles of sucrose, C12H22O11, are in a 25 g sample of sucrose?

0.073 mol

500

Our bodies synthesize protein from amino acids. One of these amino acids is glycine, which has the molecular formula C2H5O2N. How many moles of glycine are contained in 28.35 g of glycine?

0.378 mol glycine

Anything Goes!

200

Write the net ionic equation for the following reaction.

FeCl2 (aq) + Zn (s) → ZnCl2 (aq) + Fe (s)

Fe2+ (aq) + 2 Cl- (aq) + Zn (s) → Zn2+ (aq) + 2 Cl- (aq) + Fe (s)

Fe2+ (aq) + Zn (s) → Zn2+ (aq) + Fe (s)

400

Write the net ionic equation for the following reaction.

Na2SO4 (aq) + SrCl2 (aq) → SrSO4 (s) + 2 NaCl (aq)

2 Na+ (aq) + SO42- (aq) + Sr2+ (aq) + 2 Cl- (aq) → SrSO4 (s) + 2 Na+ (aq) + 2 Cl- (aq)

Sr2+ (aq) + SO42- (aq) → SrSO4 (s)

500

What is the official animal of Scotland?

Unicorn