Chemistry PreTest

Which of these is a physical change?

• burning

• igniting

• melting

• rusting

Which property is an extensive property of matter?

• A. volume

• B. density

• C. boiling point

• D. melting point

Which material is a pure substance?

• air

• water

• granite

• stainless steel

Tags

NGSS.MS-PS1-4

What do chemists study?

• the physical features of Earth

• living things and their life processes

• the composition, structure, properties, and changes of matter

• the composition, motion, and relative positions of stars and planets

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-3

NGSS.MS-PS1-4

NGSS.MS-PS1-5

What is a compound?

• another word for an atom

• any substance that can be split apart

• a molecule formed by atoms of the same element

• a molecule that is composed of two or more elements that are chemically bonded

Tags

NGSS.MS-PS1-1

Which phrase describes a change in a substance that does not involve a change in the identity of the substance?

• chemical change

• physical change

• extensive property

• intensive property

Tags

NGSS.MS-PS1-4

Which phrase describes how scientists define a system?

• the whole universe

• the question scientist want to answer

• a set of nonrelated and dependent parts that are treated as a whole

• a set of interacting, interrelated, or interdependent parts that form a complex whole

Tags

NGSS.MS-LS1-3

NGSS.MS-LS2-3

After you have identified and defined a problem to solve, what are the next steps?

• Find the criteria and tradeoffs.

• Find the criteria and constraints.

• Find the tradeoffs and optimize the solution.

• Find the constraints and optimize the solution.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Two students want to test the chemical and physical properties of a substance so they can identify it. They have a list of properties but need to determine which are physical and which are chemical. Which values from the list are physical properties?

• A. reactivity, melting point, and flammability

• B. flammability, reactivity, and density

• C. density, malleability, and flammability

• D. conductivity, malleability, and boiling point

Which phrase describes a mixture?

• . two or more atoms that are bonded together

• . two or more substances that are chemically bonded

• two or more substances that can be separated by physical means

• . two or more elements that require chemical means for separation