Chapter 18

In the unbalanced formula equation, SrBr2 + (NH4)2CO3 -> SrCO3 + NH4Br, how many different polyatomic ions are present?

2

What would be the appropriate coefficients for the reaction of NaOH + Cu(NO3)2 -> Cu(OH)2 + NaNO3

2,1,1,2

Which of the following are the correct coefficients to balance: _C2H2 + _O2 -> _CO2 + _H2O

2,5,4,2

Which of the following equations does not satisfy the law of conservation of mass?

2NaI + Cl2 -> 2NaCl + 2I

How many substances are reactants in the unbalanced chemical reaction: H2 + S + O2 -> H2SO4

3

Which of the following is the correct, balanced form of the equation Fe + O2 -> Fe2O3?

4Fe + 3O2 -> 2Fe2O3

What kind of reaction is C2H2 + O2 -> CO2 + H2O

Combustion

In the word equation: iron + copper (II) sulfate -> iron (II) sulfate + copper, Which of the following are products (choose two)?

Copper ,iron (II) sulfate

Which of the following is NOT evidence of a chemical reaction

Melting

The equations, SrBr2 + (NH4)2CO3 -> SrCO3 + NH4Br, will be balanced if the coefficient of which term is changed to 2?

NH4Br

A decomposition reaction is the only of chemical reaction that has

One reactant

Which of the following statements is true for a balanced chemical reaction

Selected: b. the number of atoms of an element that make up the reactants is equal to the number of atoms of that element that make up the products. This answer is correct.

What kind of chemical reaction results from the interaction between Ca2Si and Cl2?

Single Displacement

What would be the products of a reaction between HgCl2 + AgNO3 ->

c. Hg(NO3)2 + AgCl

According to the law of conservation of mass, the total mass of the reacting substances is

d. always equal to the total mass of the products

The reaction between Zn and H2SO4 is not likely to occur.

False

1. (l) Selected: c. liquidThis answer is correct. 2. (s) Selected: e. solidThis answer is correct. 3. (g) Selected: b. gasThis answer is correct. 4. (aq) Selected: d. Aqueous solutionThis answer is correct. 5. Triangle Selected: a. substances are heatedThis answer is correct.

...

The reaction water + energy -> hydrogen gas + oxygen gas is best described as which of the following reactions

Decomposition

In the reaction: water + energy -> hydrogen gas + oxygen gas, energy is absorbed.

True

In the reaction of KI + Br2, no reaction would occur.

false