Exam 1 Review

Which of the following substances are elements?

• water

• salt

• carbon dioxide

• hydrogen

How many elements are in this Carbon dioxide molecule?

• 3

• 2

• 1

• 0

Tags

NGSS.MS-PS1-1

Whys is B considered to be a compound?

• It is made of more than one element.

• It can be broken down into the elements that comprise it.

• It's a pure substance composed of 2 kinds of atoms.

• All are true

How many elements are in this potassium chloride (KClO₃) molecule?

• 3

• 4

• 5

• 6

What is true of both elements and compounds?

• They are always made of more than one element.

• They are large.

• They don't last long.

• They are considered to be pure substances.

Evaporating, dissolving, & melting are all examples of

• elements

• compounds

• physical changes

• chemical reactions

Which of the following is not evidence of chemical change?

• gas production

• temperature change

• dissolving

• color change

Tags

NGSS.MS-PS1-2

If a solid is added to water and then a gas is given off, it is evidence of

• chemical change occurring

• a new product forming

• atoms rearranging

• all are true

characteristic/trait that can be seen through direct observation of a substance.

• mixture

• physical property

• physical change

• chemical property

• chemical change

A physical property that measures mass per unit volume

• density

• flammability

• physical property

• element

• reactivity