S1 Final Exam - Unit 2 review

sharpening a pencil

• physical change

• physical property

• chemical change

• chemical property

flammability of a substance

• physical change

• physical property

• chemical change

• chemical property

size of an object

• physical change

• physical property

• chemical change

• chemical property

inflating a tire

• physical change

• physical property

• chemical change

• chemical property

Physical properties are

• properties that can be observed without changing the identity of the substance
• properties that describe how a substance changes into a completely different substance
• properties that we can only observe with our eyes
• properties that we need special tools to observe

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

_____ have molecules that are packed together and hardly move.

• solids

• liquids

• gases

• plasma

Tags

NGSS.MS-PS1-4

____ have a definite volume and molecules that are spread out and can move past one another.

• solids

• liquids

• gases

• plasma

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

____ have molecules that can spread out far from each other and move quickly.

• solids

• liquids

• gases

• plasma

Tags

NGSS.MS-PS1-4

A bar of copper has a mass of 216g and a volume of 24 cm³. What is the density of copper?

• 9.0g/cm³

• 5184g/cm³

• .11g/cm³

• 322mL