Test 2 Review

1) The smallest basic unit of matter is the

• a) cell.
• b) molecule.
• c) atom.
• d) compound.

Tags

NGSS.HS-PS1-7

2) Atoms in molecules share pairs of electrons when they make

• a) polymers
• b) covalent bonds.
• c) ionic bonds.
• d) hydrogen bonds.

3) What gives water many properties that are important to living things?

• a) specific heat
• b) temperature
• c) hydrogen bonds
• d) density

Tags

NGSS.HS-ESS2-5

4) Which of the following solutions has the highest H+ ion concentration?

• a) a solution with a pH of 10
• b) a solution with a pH of 7
• c) a solution with a pH of 4
• d) a solution with a pH of 1

5) Both animal fats and plant oils are made up of glycerol and

• a) saturated fats.
• b) phospholipids.
• c) fatty acids.
• d) polar molecules.

Tags

NGSS.HS-PS1-2

6) How do ions form?

• a) Atoms gain or lose electrons.
• b) Atoms combine to make a larger atom.
• c) Two atoms share electrons.
• d) Atoms form covalent bonds.

7) Which substance represented in the figure (A or B) is the solute?

• a) substance A
• b) substance B
• c) both A and B
• d) neither A nor B

8) Identify the reactants in this reaction: 6H2O + 6CO2 → C6H12O6+ 6O2.

• a) 6H2O and 6CO2
• b) 6CO2 and C6H12O6
• c) 6H2O, C6H12O6, and 6O2
• d) C6H12O6 and 6O2

Tags

NGSS.HS-LS2-5

9) The activation energy needed for a chemical reaction is decreased by a

• a) substrate.
• b) catalyst.
• c) reactant.
• d) product.

10) Which property of carbon makes it the “building block of life”?

• a) its hydrogen bonding
• b) its covalent bonding
• c) its ability to dissolve substances
• d) its specific heat