Pure Substances and Mixtures

Which of the following is a characteristic of a compound?

• Physically combined

• Chemically combined

• Variable proportions

• Components retain properties

What is a characteristic of a mixture?

• Chemically Combined

• Fixed proportions

• Made of elements

• Variable proportions

Which of the following describes how components in a mixture behave?

• Components retain properties

• Components change properties

• Fixed proportions

• Made of elements

What is true about the components of a compound?

• Fixed proportions

• Variable proportions

• Physically combined

• Components retain properties

Tags

NGSS.MS-PS1-1

Identify each of the images as an element, molecule, or compound.

• A: Element, B: Compound, C: Molecule

• A: Compound, B: Element, C: Molecule

• A: Molecule, B: Compound, C: Element

• A: Element, B: Molecule, C: Compound

Tags

NGSS.MS-PS1-1

Compounds are formed when two or more ______ are chemically combined.

• compounds

• atoms

• elements

• molecules

Tags

NGSS.MS-PS1-1

An element is a ______ substance that cannot be separated into simpler substances by physical or chemical means.

• pure

• combined

• original

• complex

When two or more elements are ______ combined, a new substance is formed with new chemical and physical properties.

• chemically

• physically

• loosely

• randomly

Tags

NGSS.MS-PS1-2

Which image(s) would be considered pure substances?

• V

• I and II

• II and IV

• III and V

Tags

NGSS.MS-PS1-1

Using the diagram, justify the source of data used to develop the technology for refining the crude oil.

• Different fuel components have different densities, allowing them to be separated.

• Different fuel components have different melting points, allowing them to be separated.

• Different fuel components boil at different temperatures, allowing them to be separated.

• Different fuel components combust at different temperatures, allowing them to be separated.

Tags

NGSS.MS-PS1-4