Physical Science Question Preview (ID: 33630)


Ch. 7 Chemical Reactions. TEACHERS: click here for quick copy question ID numbers.

In the following equation, what are the reactants? NaHCO3 + HCl = NaCl + H2O + CO2
a) NaHCO3 and HCl
b) NaHCO3 and NaCl
c) HCl and NaCl
d) NaCl, H2O, and CO2

Which of the following is a statement of the law of conservation of mass?
a) mass is created but not destroyed
b) mass is destroyed but not created
c) mass is neither created nor destroyed
d) mass is both created and destroyed, depending on the chemical reaction

The mass of a hydrogen atom is 1.0 amu, and the mass of a carbon atom is 12.0 amu. What is the molar mass of methane, CH4?
a) 13.0 amu
b) 13.0 g
c) 16.0 amu
d) 16.0 g

In what type of reaction does one reactant form two or more products?
a) synthesis
b) decomposition
c) single replacement
d) double replacement

What particle is transferred from one atom to another in a redox reaction?
a) electron
b) neutron
c) proton
d) nucleus

Which of the following is a single replacement?
a) KOH + HCl = KCl + H2O
b) 2Na + 2H2O = H2 + 1NaOH
c) 2C2H6 + 7O2 = 4CO2 + 6H2O
d) H2O + CO2 = H2CO3

How are reactions related to chemical bonds?
a) Bonds in the reactants are broken, and bonds in the products are formed.
b) Bonds in the products are broken, and bonds in the reactants are formed.
c) Bonds in both the reactants and products are broken.
d) Bonds are formed in both the reactants and the products.

What type of reaction always releases energy?
a) endothermic
b) exothermic
c) decomposition
d) oxidation-reduction

In general, an increase in temperature
a) increases reaction rate
b) decreases reaction rate
c) does not affect reaction rate
d) acts as a catalyst

What takes place at chemical equilibrium?
a) Reactants form more quickly than products
b) Products form more quickly than reactants
c) Reactants and products stop forming
d) Reactants and products form at the same rate

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