Pure Substance

What is this?

• Atoms of an element

• Mixture

• Compound

• Molecules

Tags

NGSS.MS-PS1-1

What is this?

• A compound

• A mixture

• An atom

• An element

Tags

NGSS.MS-PS1-1

What is this?

• Mixture

• Compounds

• Element

• Mixture

Tags

NGSS.MS-PS1-1

Which of these is an example of a pure substance?

• Tap water

• Juice

• Milk

• Distilled water

Tags

NGSS.MS-PS1-4

What 2 types of matter are pure substances?

• elements and compounds

• elements and mixtures

• mixtures and compounds

• atoms and elements

What is the main difference between a pure substance and a mixture?

• Pure substances have variable compositions, while mixtures have fixed compositions.

• Pure substances can be separated by physical means, while mixtures cannot.

• Pure substances have a fixed composition, while mixtures have variable compositions.

• Pure substances are always elements, while mixtures are always compounds.

Pure Substance

• smallest particle of an element

• solid material whose atoms are arranged in an ordered pattern

• anything that has mass and takes up space

• single substance with definite composition and properties

What is a pure substance that cannot be broken down into simpler substances?

• Atom

• Element

• Molecule

• Compound

Match the following pure substances:

• Hydrogen

• Element

• NaCl

• Compound

• O₂

• Molecule

Which of the following best describes a compound?

• A mixture of two or more elements that can be separated by physical means.

• A pure substance composed of two or more elements chemically combined in a fixed ratio.

• A substance that cannot be broken down into simpler substances.

• A homogeneous mixture of substances.