Atoms Molecules Pure Substances and Mixtures

Which of the following is an example of a homogeneous mixture?

• Salt Water

• Pizza

• Salad

• Gravel

Two substances physically combined and that appear the same throughout is classified as:

• homogeneous mixture

• heterogeneous mixture

• element

• compound

Which describes a property of all elements?

• All elements are metals.

• All elements have six electrons.

• All elements are pure substances.

• All elements exist in the solid phase.

What do any two samples of the element mercury (Hg) have in common?

• the same mass

• the same volume

• the same type of atoms

• the same number of neutrons

Which of the following is an example of a compound?

• copper

• iron

• carbon

• water

Tags

NGSS.MS-PS1-1

Which of the samples shown represents an element?

• substance 1

• substance 2

• substance 3

• substance 4

Tags

NGSS.MS-PS1-1

The table below shows several minerals found in Earth’s crust.

Based on the information in the table, which mineral is also an element?

• graphite

• quartz

• quartz

• hematite

Tags

NGSS.MS-PS1-1

Which of the following is an example of a heterogeneous mixture?

• Salt water

• Liquid dishwashing detergent

• Metal alloys

• Oil and vinegar salad dressing

A student is given a mixture of granulated sugar and iron fillings. Identify two procedures the student could use to separate them, and explain how the different properties of sugar and iron allow each separation procedure to work.

• Filtration and Centrifuge.

• Magnets and Filtration

• Physically picking out the iron filings

• Chromatography

The chemical formula for methane is CH4

,

and a model of its structure is shown.

The model of methane represents a(n)

• isotope

• ion.

• atom.

• molecule.

Tags

NGSS.MS-PS1-1