Chemistry daily 10 s
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Chemistry Daily 10’s. Week 12. 1. 1. In a chemical reaction a. the mass of the reactants equals the mass of the products. b. the mass of the products is greater than the mass of reactants. c. the number of atoms in the reactants and products must change.

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Chemistry daily 10 s
1

1. In a chemical reaction

a. the mass of the reactants equals the mass of the products.

b. the mass of the products is greater than the mass of reactants.

c. the number of atoms in the reactants and products must change.

d. energy as heat must be added to the reactants.


Chemistry daily 10 s

2. In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is

a. H.

b. 2H.

c. H2.

d. OH.


Chemistry daily 10 s
2

1. Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?

a. Carbon plus oxygen yields carbon dioxide.

b. C + O2CO2

c. CO2C + O2

d. 2C + O CO2


Chemistry daily 10 s

2. A chemical formula written over the arrow in a chemical equation signifies

a. a by-product.

b. the formation of a gas.

c. a catalyst for the reaction.

d. an impurity.


Chemistry daily 10 s
3

1. Which coefficients correctly balance the formula equation

NH4NO2(s)N2(g) + H2O(l)?

a. 1, 2, 2

b. 1, 1, 2

c. 2, 1, 1

d. 2, 2, 2


Chemistry daily 10 s

2. In what kind of reaction does one element replace a similar element in a compound?

a. displacement reaction

b. combustion

c. decomposition reaction

d. ionic reaction


Chemistry daily 10 s
4

1. In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds?

a. synthesis reaction

b. double-displacement reaction

c. decomposition reaction

d. combustion reaction


Chemistry daily 10 s

2. The reaction represented by the equation 2KClO3(s) 2KCl(s) + 3O2(g) is a(n)

a. synthesis reaction.

b. decomposition reaction.

c. combustion reaction.

d. ionic reaction.


Chemistry daily 10 s
5

1. If chlorine gas is produced by halogen replacement, the other halogen in the reaction must be

a. bromine.

b. iodine.

c. astatine.

d. fluorine.


Chemistry daily 10 s

2. Which reaction does not occur?

a. 2HF(aq) + Cl2(g) F2(g) + 2HCl(aq)

b. 2Na(s) + ZnF2(aq) 2NaF(aq) + Zn(s)

c. Fe(s) + CuCl2(aq) FeCl2(aq) + Cu(s)

d. 2HCl(aq) + Mg(s) MgCl2(aq) + H2(g)


Answers standards
Answers & Standards

  • 1.1 – a – sc2b

  • 1.2 – c – sc2a

  • 2.1 - b – sc2a

  • 2.2 - c – sc2a

  • 3.1 - b – sc2a

  • 3.2 - a – sc2a

  • 4.1 - b – sc2a

  • 4.2 - b – sc2a

  • 5.1 - d – sc2a

  • 5.2 - a – sc2a