Chemical Reactions Quiz

Which of the following is made of two of more substances that are in the same place but not chemically combined?

• Solution

• Solvent

• Solute

• Mixture

Homogeneous Mixtures

• Homogeneous mixtures are always solid.
• Homogeneous mixtures have distinct layers or phases.
• Homogeneous mixtures are uniform in composition.
• Homogeneous mixtures can be easily separated into their components.

Heterogeneous Mixtures

• Heterogeneous mixtures cannot be separated into their components.
• Heterogeneous mixtures consist of only one phase.
• Heterogeneous mixtures consist of visibly different substances or phases.
• Heterogeneous mixtures are uniform in composition.

Evidence of Chemical Changes

• Dissolving sugar in water
• Melting of ice
• Formation of a solid from a liquid solution
• Evidence of chemical changes includes color change, gas production, temperature change, and formation of precipitates.

Tags

NGSS.MS-PS1-2

Physical Changes

• Chemical reactions
• Changes in temperature
• Changes in color
• Changes in state, changes in shape or size, mixing substances.

Tags

NGSS.MS-PS1-4

What are products in a chemical reaction?

• Products are the energy released during a chemical reaction.
• Products are the substances formed as a result of a chemical reaction.
• Products are the catalysts used in a chemical reaction.
• Products are the starting materials in a chemical reaction.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What are the reactants in a chemical reaction?

• The reactants in a chemical reaction are the starting substances that undergo a change.
• The substances that remain unchanged during the reaction.
• The products formed after a reaction.
• The energy released during the reaction.

Tags

NGSS.MS-PS1-1

Conservation of Mass

• Mass can be created in a closed system.
• Mass is lost during chemical reactions.
• Mass is conserved in a closed system.
• Mass varies with temperature changes.

Tags

NGSS.MS-PS1-5

How do we know if conservation of mass was observed?

• Conservation of mass is observed if the mass of reactants equals the mass of products.
• Mass of reactants is always greater than products.
• Mass is only conserved in closed systems.
• Mass of products can vary regardless of reactants.
• The number and type of atoms are equal in the reactants and products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

exothermic reaction

• A chemical reaction that releases energy.
• A chemical reaction that absorbs energy.
• A process that occurs without any energy change.
• A reaction that only occurs at high temperatures.

Tags

NGSS.MS-PS1-4