Unit 2 test review

Is mixing calcium chloride and water a physical change or a chemical reaction?

• chemical change

• physical change

Which physical property of matter describes how a substance looks and feels?

• Texture

• Mass

• State of Matter

• Luster

What is the atomic number of lead?

• 207.2

• 207

• 82

• 125

What is the atomic mass of lead?

• 207.2

• 208

• 82

• 125

   A _______ does change the chemical composition or identity of the substance.

• chemical change

• physical change

• chemical properties

• physical properties

Which state of matter has atoms or molecules spread the farthest apart?

• solid

• liquid

• gas

• grass

Is burning wood a physical change or a chemical reaction?

• chemical reaction

• physical change

Air is an example of a

• solid
• liquid
• gas

What state of matter is shown in the image?

• Solid

• Liquid

• Gas

• False

How many electrons are there in one atom of lead?

• 207

• 207.2

• 82

• 125