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Which phase of matter is the least compressible?

• Gases

• Liquids

• Solids

• Plasma

A scientist has a sample of a substance. By conducting experiments the scientist has determined the following information. - The substance is composed of only one type of atom. - The substance is pure. - The substance cannot be separated by filtering. - The substance can be represented by a chemical symbol. Which of these is most likely the substance the scientist is examining?

• Oxygen

• Air

• Sugar

• Water

Tags

NGSS.MS-PS1-1

Density refers to how heavy or how much matter is packed into a space. After comparing four liquids (liquid soap, maple syrup, olive oil, and water), a teacher wrote a statement about the liquids.

Olive oil is light and floats on the surface of the water.

Identify the liquid with the lowest density.​​

• liquid soap
• maple syrup

• water

• olive oil

How should the student complete the statement in order to make a true comparison statement for each substance? Use the drop-down to complete the statement. Oil is _______ than water and floats on the surface.

Milk is _______ but lighter than honey.

Honey is the _______ of all of the liquids.

The pictures above show a blue liquid being added to a clear liquid. Which is the best evidence that a chemical reaction may have occurred?

• The solution turned light blue.

• The temperature remained the same.

• Solid particles formed.

• The volume increased.

Tags

NGSS.MS-PS1-2

Which of the following lists of properties best describes nonmetals?

• Brittle, shiny, conductor

• Malleable, shiny, conductor

• Brittle, dull, insulator

Students examined the properties of five different elements and recorded observations about their properties in the table. Based on the students' observations, classify each sample as a metal, nonmetal, or metalloid. Move the correct answer to each box. Each answer may be used more than once.

A student was asked to demonstrate a chemical change to the class. A candle was lit and as it burned, the student explained that the shorter length was evidence of a chemical change. This

Tags

NGSS.MS-PS1-2