5 Written Questions

1. formed when two or more atoms join together chemically
2. Gases produced/released by burning fossil fuels that build up in the atmosphere.
3. Properties that do not change the chemical nature of matter
   ex. color, smell, freezing point, boiling point, melting point
4. mass is neither created nor destroyed in any ordinary chemical reaction
5. the factor that can be varied or manipulated in an experiment. (this was the Alka Seltzer tablet in your lab on Adding CO2)

5 Matching Questions

1. Density
2. Chemical Change
3. Chemical Property
4. Atom
5. Element

1. a Properties that do change tha chemical nature of matter
   ex. heat of combustion, reactivity with water, PH
2. b a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus
3. c substances are changed into different substances, All compounds are molecules but not all molecules are compounds. ex. fireworks, color changes, light
4. d measures buoyancy
5. e basic building block of matter

5 Multiple Choice Questions

1. a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions
   1. Molecule
   2. Compound
   3. Mass
   4. Volume
2. can be physically separated into pure compounds or elements
   1. Molecule
   2. Mixture
   3. Mass
   4. Volume
3. the amount of space that a substance or an object takes up
   1. Molecule
   2. Mixture
   3. Volume
   4. Atom
4. what is measured in an experiment. (this was the temperature in your lab on Adding CO2)
   1. Element
   2. Independent Variable
   3. Dependent Variable
   4. Controlled Variable
5. measures the amount of matter in an object.
   1. Mixture
   2. Volume
   3. Atom
   4. Mass

5 True/False Questions

1. Controlled Variable → any factor that remains unchanged and strongly influences values; also, a factor held constant to test the relative impact of an independent variable. (this was the cover on the plastic bin and water in your lab on Adding CO2)

   True        False

2. States of Matter → solid, liquid, gas

   True        False

3. Pure Substance → cannot be broken down into simpler pieces, an element is an example of a pure substance because it cannot be broken down into simpler substance.

   True        False

4. Carbon Footprint → A measure of your impact on the environment. It is the amount of carbon produced by all of your activities. For instance, producing the electricity that powers your video game may be putting carbon dioxide into the atmosphere. Carbon dioxide is given off when you ride in a gasoline-powered car.

   True        False

5. Hypothesis → What you think will happen.

   True        False