Mixtures/Physical and Chemical Changes

Which substance is a mixture?

• sugar

• salt

• water

• milk

Which of the following is NOT a chemical change?

• Sugar dissolving in water

• Fire burning paper

• Souring milk

• Rusting metal

Tags

NGSS.MS-PS1-2

To separate metal shards from water, which of the following can be used?

• Magnet and filter

• Sieve and evaporation

• Decantation and distillation

• Sedimentation and centrifugation

What happens when Distillation occurs when separating a homogeneous mixture?

• The mixture is cooled to form a solid.

• The components are separated based on boiling points.

• The mixture is filtered to remove solids.

• The components are separated based on density.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What occurs during all chemical changes?

• Formation of new substances

• Change in state

• Absorption of energy

• Release of light

Tags

NGSS.MS-PS1-2

A law that states that the total mass of the substances before a chemical change is the same as the total mass of the substances after the chemical change.

• Law of Conservation of Mass

• Law of Definite Proportions

• Law of Multiple Proportions

• Law of Constant Composition

Tags

NGSS.MS-PS1-5

Which of these represents a chemical change?

• A match is lit, creating a yellow-orange flame

• A small piece of ice melts, changing from a solid to a liquid

• A ball of clay sinks in water, and floats when reshaped

• A pot of water is heated to boiling, and evaporation occurs

Tags

NGSS.MS-PS1-2

A mixture in which two or more pure substances are not evenly mixed is called a:

• Homogeneous mixture

• Heterogeneous mixture

• Solution

• Compound

A mixture in which two or more pure substances are evenly mixed is called a:

• Solution/Homogenous Mixture

• Compound

• Element

• Suspension

Which statement best describes a physical change?

• A process separates water into hydrogen gas and oxygen gas

• An iron nail exposed to the atmosphere forms rust

• Burning carbon releases the gas carbon dioxide

• Salt added to a cup of water makes salt water