pulse check reaction rate

What is a physical change?

• A change in the physical properties of a substance without altering its chemical composition.

• An alteration in the chemical composition of a substance.

• An irreversible transformation process that destroys the original substance.

• A process that changes both physical and chemical properties.

What is a chemical change?

• A process that results in the formation of one or more new substances with entirely different properties.

• A process that only changes the physical state of a substance without altering its composition.

• A reversible process where the substance returns to its original state.

• An event where temperature is the only factor that changes.

What is a solute?

• A) A homogenous mixture

• B) A substance in which another substance is dissolved

• C) A substance that dissolves into another substance

What is a solvent?

• A homogenous mixture

• A substance in which another substance is dissolved

• A substance that dissolves into another substance

What effect does smaller particle size have on the rate of dissolution or reaction?

• Slower rate

• Faster rate

• No effect

Fill in the blank: More agitation (stirring) causes the rate of dissolution or reaction to _______.

• increase

• decrease

• remain the same

• fluctuate

Two liquids react faster than a solid and a liquid because they allow for greater molecular interactions due to increased contact surface area.

• Greater molecular interactions and surface contact

• The solid does not participate in the reaction

• Only temperature increases reaction speed

• Reaction speed is independent of the state of matter

How does increasing the temperature affect the rate of dissolution or reaction?

Increasing the concentration of a solute or reactant causes the rate of dissolution or reaction to ________.

• increase

• decrease

• remain constant

• fluctuate unpredictably