Chemistry Honors Unit 6 - Chemical Reactions

Balancing Equations

100

What numbers in a chemical equation do you change to balance it?

Coefficient

200

Balance : ___ H2 + ___ Cl2 -> ___ HCl

___ H2 + ___ Cl2 -> _2_ HCl

300

What does the law of mass conservation state?

the number of each element in the reactants must equal the number of those elements in the products.

400

_1_ Ca + _2_ H20 -> _1_ Ca(OH)2 + _1_ H2

_1_ Ca + _2_ H20 -> _1_ Ca(OH)2 + _1_ H2

500

Balance: __Mg(OH)2 + __H3PO4 -> __H20 + __Mg3(PO4)2

_3_Mg(OH)2 + _2_H3PO4 -> _6_H20 + __Mg3(PO4)2

Types of Reactions

100

What type of reaction combines two reactants to make one product?

Synthesis/combination reaction

200

How many reactants are involved in a decomposition reaction?

ONE

300

When a free element takes the place of an element in a compound, what kind of reaction is taking place?

Single Replacement Reaction

400

In a combustion reaction, like when we burned the ethanol in lab in the fume hood, what two substances are produced?

Carbon dioxide and water

500

What type of reaction could possibly form a precipitate?

Double replacement reaction

Naming Molecules

100

What charge is a cation?

Positive

200

In an ionic compound, which comes first, the cation or the anion?

Cation

300

What is the charge of the ion "OH"?

1-

400

If the cation has a charge of 2+ and the anion has a charge of 1-, how many of each do you need to make the ionic compound neutral?

1 cation and 2 anions

500

If Co(NO3)2 is an ionic compound, then what must the charge of Co be?

2+

Solubility

100

Is a precipitate soluble or insoluble?

Insoluble

200

NaNO3 dissolves in a liquid solution. How do you write this compound when including the state of matter it is in?

NaNO3 (aq)

300

Is NaOH soluble or insoluble?

Soluble

400

NaOH and KNO3 react in solution. What ions do these polyatomic compounds dissociate into?

Na+ , OH- , K+ , NO3-

500

NaOH and KNO3 react in solution. What products are produced, and which of the two is a precipitate?

Precipitate: KOH (s) Non-precipitate/dissolved: NaOH (aq)

Stoichiometry

100

You are assembling hot dogs. You have 8 buns and 5 dogs. Which is the limiting reactant?

dogs

200

4 NH3 + 5 O2 -> 6 H2O + 4 NO If 9.5 moles of H20 are produced, how many moles of O2 were used?

7.9 moles of 02

300

4 NH3 + 5 O2 -> 6 H2O + 4 NO What is the formula mass for H20?

18g/mol

400

4 NH3 + 5 O2 -> 6 H2O + 4 NO If 18 mol of H20 are produced, how many grams of NH3 were used? (the formula mass of NH3 is 17g/mol)

204g of NH3

500

4 NH3 + 5 O2 -> 6 H2O + 4 NO if 23g of O2 are used in the reaction, how many grams of NO are produced? (Formula mass of O2 is 32g/mol and of NO is 30g/mol)

17.25g of NO