Chem Sem1 Review

Eva toasts a marshmallow over a fire. Which of these is not evidence that a chemical change has occurred?

• the interior of the marshmallow melts

• the marshmallow gives off an odor

• a new substance with new properties is created on the outside of the marshmallow

• the outside of the marshmallow turns black

Tags

NGSS.MS-PS1-2

Water in the cracks of rocks freezes and expands when the temperature drops below freezing and melts when the temperature rises above freezing. Over extended periods of time, this can cause rocks to change. Which of these best defines this type of change?

• chain reaction

• chemical change

• physical change

• nuclear reaction

Tags

NGSS.MS-ESS2-2

Which of these best defines what happens when limestone rock reacts with and is dissolved by acidic water?

• physical change

• nuclear reaction

• chemical change

• nuclear reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT an example of matter?

• water vapor

• air

• heat

• smoke

A measure of the amount of “stuff” or material an object has is called?

• density

• matter

• volume

• mass

Tags

NGSS.MS-PS1-5

Which of the following is a homogenous mixture?

• sand in water

• salt water

• soil

• beef stew

A 40g sample of Calcium, which is a silver metal, but if exposed to air, it will rapidly corrode as it reacts with N₂ and O₂. When burning, it creates a bright red flame that cannot be extinguished with water. Its’ melting point is 839.0 degrees Celsius and its’ boiling point is 1484 degrees Celsius. Which of the following properties of Calcium is chemical?

• boiling point

• reacting with N₂

• 40g sample

• silver color

Tags

NGSS.MS-PS1-2

Which of the following is a true substance?

• coffee

• salad

• aspirin

• pepsi

Goggles should be worn at all times.

• True

• False

You should always add water to acid, not acid to water.

• True

• False