Standardized Test Prep

Multiple Choice

1. The elements or compounds that enter into a chemical reaction are called

   1. products.

   2. catalysts.

   3. active sites.

   4. reactants.

2. Chemical bonds that involve the total transfer of electrons from one atom or group of atoms to another are called

   1. covalent bonds.

   2. ionic bonds.

   3. hydrogen bonds.

   4. van der Waals bonds.

3. Which of the following is NOT an organic molecole found in living organisms?

   1. protein

   2. nucleic acid

   3. sodium chloride

   4. lipid

4. Which combination of particle and charge is correct?

   1. proton: positively charged

   2. electron: positively charged

   3. neutron: negatively charged

   4. electron: no charge

5. In which of the following ways do isotopes of the same element differ?

   1. in number of neutrons only

   2. in number of protons only

   3. in numbers of neutrons and protons

   4. in number of neutrons and in mass

6. Which of the following molecoles is made up of glycerol and fatty acids?

   1. sugars

   2. starches

   3. lipids

   4. nucleic acids

7. Nucleotides consist of a phosphate group, a nitrogenous base, and a

   1. fatty acid.

   2. lipid.

   3. 5-carbon sugar.

   4. 6-carbon sugar.

Questions 8–9

The enzyme catalase speeds up the chemical reaction that changes hydrogen peroxide into oxygen and water. The amount of oxygen given off is an indication of the rate of the reaction.

8. Based on the graph, what can you conclude about the relationship between enzyme concentration and reaction rate?

   1. Reaction rate decreases with increasing enzyme concentration.

   2. Reaction rate increases with decreasing enzyme concentration.

   3. Reaction rate increases with increasing enzyme concentration.

   4. The variables are indirectly proportional.

9. Which concentration of catalase will produce the fastest reaction rate?

   1. 5%

   2. 10%

   3. 15%

   4. 20%

Open-Ended Response

10. List some of the properties of water that make it such a unique substance.

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