CHEMISTRY REVIEW

1. Label the substances as either elements or compounds.

Fe2 ________________

K ________________NaCl ________________NaCO3 ________________

He ________________H2O ________________

2. The word pure refers to what?

3. Write a chemical symbol with two letters correctly.

4. Write a compound correctly. (It can be made up)

5. An ounce of copper can be spun into wires. What term is used to describe this physical property of

copper?

6. Which column indicates only a chemical change?

1 2 3 4

Silver tarnishes Ice melting Chalk fizzing Burning wood

Bike rusting Paper tearing Sugar dissolving Cutting wood

7. Which substance best represents a compound?

1 Made of one type of matter

2 Will not separate easily

3 Separated easily

8. Jerry was investigating a mystery substance. He observed the substance was shiny in luster, he could hit the substance

and it did not break, and lit up a bulb when connected to a battery. The substance is

most likely a what?

9. Nine grams of a green solid is added to 20 grams of water at 12⁰C. Which observation best indicates that a chemical reaction occurred in the solution?

A. The total mass of the solution was 29 grams

B. The substance was greenC. The temperature increased from 12⁰C to

32⁰C

10. What is the difference between Oxygen and Glucose?

Glucose C6H12O6

Sodium Chloride NaCl

Oxygen O2

Hydrochloric Acid HCl

11. Which substances are elements?

1 Ca2 H2SO4

3 rb4 H2O5 K6 HOP

12. Three substances are mixed with a clear liquid. Which mixture most likely reacted chemically?

Substance Before mixing Mixture

1 Amber liquid Pale amber liquid

2 Clear liquid Green liquid

3 Red crystals Red liquid

13. How many sulfur atoms are in the formula Na2SO4?

14. List 3 examples of evidence of NOT a chemical change.

15. Which substance is most likely a metalloid?

Substance Luster Malleability/ Ductility

Conductivity

1 None No Insulator

2 High Yes Conductor

3 High No Semi-conductor

4 Low No Insulator

16. A pure substance that cannot be broken down is called what?

17. Which mystery substance is a nonmetal?

1 Dull, yellow, powdery solid, smells like eggs, brittle

2 Silvery-gray, solid, shaped into a bar, malleable

3 Reddish-brown, shiny solid, shaped into a wire, can be stretched, malleable

18. Tina combined two liquids in the lab. In which experiment did a chemical change NOT take place?

1 The liquids changed from clear to dark green

2 One liquid settled to the bottom

3 Bubbles formed

19. What is the difference in grams between the total mass of the liquids and the total mass of the solids?

Water 125

Toothpicks 5

Marbles 40

Oil 75

Sugar cubes 20

Alcohol 98

20. How many atoms of each element are in the following compound?

CaCO3

Ca _________

C __________

O __________

21. Which section holds the nonmetals?

2

1

3