Investigating Properties of Matter

Which of the following are considered pure substances? Select TWO correct answers.

• element

• compound

• solution

• homogeneous mixture

• heterogeneous mixture

Tags

NGSS.MS-PS1-4

Which statement BEST describes the motion of water molecules as the water changes state from steam to liquid?

• The molecules move faster and occupy more space.

• The molecules move slower and occupy more space.

• The molecules move faster and occupy less space.

• The molecules move slower and occupy less space.

Tags

NGSS.MS-PS1-4

An ice cube melts on a hot summer day because the energy of the particles

• decreases over a period of time and is lost.

• increases and the particles move apart.

• causes them to lock together.

• is converted into potential energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which type of matter can be separated by physical means?

• atom

• element

• compound

• mixture

An element is a pure substance in which there are how many kinds of atoms?

• 2

• 4

• 3

• 1

Define a pure substance?

• A pure substance consists of a single type of particles and constant composition.

• A pure substance consists of two different types of particles with variable composition

• A pure substance consists of many types of particles and different composition

A mixture in which the substances that make up the mixture are not evenly mixed.

(a)  

Sugar ( C₁₂ H₂₂ O₁₁ ) + Water ( H₂ O )

•  Homogeneous 

•  Element 

•  Compound 

•  Heterogeneous 

which is the best example of pure substance?

• pizza

• saltwater

• air

• gold

Tags

NGSS.MS-PS1-4

(a)   Substances: matter that is always made up of the same combination of atoms.

Elements and compounds can both be considered pure substances.