Chemistry Reviewer 1

What is the purpose of a control variable in an experiment?

• To serve as the main focus of the investigation.

• To ensure that the experiment is valid by minimizing external factors.

• To determine the dependent variable.

• To provide additional data for analysis.

True or False: A hypothesis must always be proven correct for an experiment to be successful.

• True

• False

Design an experiment to test the effect of light intensity on the rate of photosynthesis. Identify then independent, dependent, and controlled variables.

What term describes the maximum amount of solute that can dissolve in a solvent at a given temperature?

Which of the following increases the rate of solute dissolution?

• decreasing temperature

• using larger solute particles

• stirring the solution

• decreasing solvent volume

Calculate the molarity of a solution containing 5 moles of NaCl in 2liters of water.

True or False: A mixture has a fixed composition.

• True

• False

What type of mixture is composed of visibly distinguishable parts?

A mixture contains sand, salt, and water. Describe the steps to separate the components.

Which of the following is a compound?

• Oxygen

• Sodium chloride

• Gold

• Hydrogen gas