Unit 1 CDA review 2017
1. Why a chicken casserole is considered a heterogeneous mixture?
2. What are pure substances?
***Which of the following are pure substances?
a. Helium in a balloon
b. Air in a tire
c. Salt water from the ocean
d. Chocolate milk
3. Both elements and compound are pure substances. True or False and explain why.
4. Jamie creates an experiment to separate a mixture of sand, salt, and gravel. Explain why Jamie can separate the next mixture back into the original three substances.
5. Susie is making trail mix. What kind of substance does she produce?
6. Aluminum, Oxygen, and salt are pure substances. Why is this a true statement?
7. What characteristic of an element determines its placement on the Periodic Table of Elements?
8. What are metalloids?
9. What does the atomic number tell you?
10. Why does Potassium have chemical properties most similar to Lithium?
11. Explain what it means to when elements are in groups or families.
12. How do the elements change as you move left to right across the periodic table?
13. In H2SO4, what do the subscript numbers tell you?
14. Draw a model of a water molecule and label.
15. Which of these is not a physical property: conductivity, melting, boiling, or rusting
16. What do you need to know in order to calculate the density of matter?
17. Which pair is an example of a chemical property: color and conductivity, boils and combustible, decomposes and reacts with water, or an alloy with zinc and easily formed into a wire.
18. True or False, the combustion of propane gas is a chemical change.
19. What happens during a physical change?
20. What is a characteristic of both liquids and gases?
21. As ice cream melts, what happens to the molecules and why?
22. When a liquid reaches its freezing point, what happens to the molecules? And why?
23. As a substance goes from a liquid to a gas, what happens to the temperature as well as its molecules?
24. Draw a picture of what the molecules would look like in all 3 states of matter.
25. Explain how the law of conservation of matter applies to a burning candle.
26. What happens to the mass of carbon and oxygen when they are chemically combined?