 |
| 1.
| |
When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?
|
| | A) | rust |
| | B) | water |
| | C) | oxygen |
| | D) | iron |
|
|
|
| 2.
| |
__________ tells you how much something changes during a period of time.
|
| | A) | A balanced chemical equation |
| | B) | A rate |
| | C) | Speed |
| | D) | Age |
|
|
|
| 3.
| |
A change in which one or more substances are converted into new substances is a __________ .
|
| | A) | physical change |
| | B) | nuclear reaction |
| | C) | chemical change |
| | D) | chemical fusion |
|
|
|
| 4.
| |
The amount of substance present in a certain volume is called the __________ of that substance.
|
| | A) | atomic number |
| | B) | chemical formula |
| | C) | concentration |
| | D) | activation energy |
|
|
|
| 5.
| |
What type of substance slows down a chemical reaction?
|
| | A) | catalyst |
| | B) | endotherm |
| | C) | inhibitor |
| | D) | enzymes |
|
|
|
| 6.
| |
A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.
|
| | A) | inhibitor |
| | B) | catalyst |
| | C) | exotherm |
| | D) | endotherm |
|
|
|
| 7.
| |
New substances produced by a chemical reaction are __________ .
|
| | A) | products |
| | B) | resultants |
| | C) | reactants |
| | D) | coefficients |
|
|
|
| 8.
| |
In chemical equations, __________ represent the number of units of each substance.
|
| | A) | reactants |
| | B) | products |
| | C) | numbers in front of the chemical formulas |
| | D) | precipitates |
|
|
|
| 9.
| |
Which of the following statements about energy-releasing reactions is true?
|
| | A) | The bonds of the products have more energy than those of the reactants. |
| | B) | The energy released is always in the form of heat. |
| | C) | The products are more stable. |
| | D) | The products are less stable. |
|
|
|
| 10.
| |
Most chemical reactions __________ when temperature increases.
|
| | A) | slow down |
| | B) | continue at the same rate |
| | C) | stop |
| | D) | speed up |
|
|
|
| 11.
| |
The law of conservation of mass states that __________ .
|
| | A) | matter can be created and destroyed but does not change forms |
| | B) | in a chemical reaction, matter is not created or destroyed, but is conserved |
| | C) | in a chemical reaction, the final mass of the products is always greater than the starting mass of the reactants |
| | D) | in a chemical reaction, efforts should be made to preserve rare elements without changing them |
|
|
|
| 12.
| |
The chemical formula for a compound tells __________ .
|
| | A) | what type of chemical bond it forms |
| | B) | how stable the compound is |
| | C) | how electrons are arranged |
| | D) | what elements it contains |
|
|
|
| 13.
| |
In a chemical equation for an endothermic reaction, how is the energy requirement indicated?
|
| | A) | The word energy is written as a reactant. |
| | B) | A Greek letter, gamma, is drawn over the arrow. |
| | C) | The word energy is written as a product. |
| | D) | A letter E appears in boldface type over the arrow. |
|
|
|
| 14.
| |
As a result of the experiments of Lavoisier, you know that in a chemical reaction, the mass of the products __________.
|
| | A) | is less than the mass of the reactants |
| | B) | always equals the mass of the reactants |
| | C) | cannot be predicted based on the mass of the reactants |
| | D) | is twice as great as the mass of the reactants |
|
|
|
| 15.
| |
__________ is a way to describe a chemical reaction using chemical formulas and symbols.
|
| | A) | A physical law |
| | B) | Synthesis |
| | C) | The law of conservation of matter |
| | D) | A chemical equation |
|
|
|
| 16.
| |
The minimum amount of energy to start any chemical reaction is called the __________ of the reaction.
|
| | A) | energy requirement |
| | B) | energy of catalyzation |
| | C) | energy of inhibition |
| | D) | activation energy |
|
|
|
| 17.
| |
If electric current passes through water and initiates a reaction, what are the expected products?
|
| | A) | hydrogen and oxygen |
| | B) | hydrogen peroxide |
| | C) | hydrogen oxide |
| | D) | oxygen and water |
|
|
|
| 18.
| |
__________ reactions absorb heat energy.
|
| | A) | Exothermic |
| | B) | Inhibited |
| | C) | Catalyzed |
| | D) | Endothermic |
|
|
|
| 19.
| |
__________ reactions release heat energy.
|
| | A) | Exothermic |
| | B) | Inhibited |
| | C) | Endothermic |
| | D) | Catalyzed |
|
|
|
| 20.
| |
Which of the following statements about energy-absorbing reactions is true?
|
| | A) | The bonds of the reactants have more energy than those of the products. |
| | B) | The energy supplied is always in the form of electricity. |
| | C) | The reactants are less stable. |
| | D) | The reactants are more stable. |
|
|
.