Unit 1 review

1. How many significant figures does 0.0023050 have?

A. 7B. 3C. 8D. 5

2. Which safety rule should always be followed during labs?

A. Closed toes shoesB. No eatingC. Long hair in a pony tailD. All of the above

3. The element symbol “S” stand for

A. SulfurB. SodiumC. StrontiumD. Tin

4. All of these are physical properties, except

A. DensityB. Boiling pointC. ReactivityD. Hardness

5. Which of the following is NOT a chemical change?

a. Heat producedb. Meltingc. Bubbles emergingd. Precipitate forming

6. An example of a homogeneous mixture is

A. OxygenB. Vegetable soupC. AirD. Carbon dioxide

7. 45 cm equals

A. 0.45 kmB. 0.45 mC. 0.45 mmD. 0.45 dm

8. The symbol for the element magnesium is

A. MnB. MoC. MgD. Ni

9. The particles in a solid are

A. Very far apartB. Packed closely togetherC. Not moving at allD. Able to slide past each other

8. What is the density of a 68 g piece of iron with a volume of 8.6 cm3 ?

A. 58.5 g/cm3

B. 1.3 g/cm3

C. 7.9 g/cm3

D. 5.5 g/cm3

11. Which of the following pieces of equipment do you use to measure volume?

A. Ring standB. Graduated cylinderC. ForcepsD. Evaporation dish

12. The correct answer for 94.21/8.3 is

A. 10B. 11C. 11.4D. 11.35

13. Which of the following element name and symbol is correct?

A. Potassium, PB. Copper, CC. Fluorine, FlD. Bromine, Br

14. A hypothesis is a

a. Well tested explanation for an observationb. Proposed explanation for an observationc. Summary of results of many observationsd. Procedure for testing an onservation

15. Physical methods can be used to separate

A. Pure substancesB. MixturesC. ElementsD. Compounds

16. Which of the following techniques can NOT be used to separate mixtures?

a. Burningb. Filtrationc. Evaporationd. Distillation

17. Steam can be considered a

A. SolidB. LiquidC. GasD. Vapor

18. Which of the following is NOT an SI unit?

A. sB. KC. mD. L

19. Which of the following is NOT a chemical reaction?

A. BurningB. BoilingC. RustingD. Oxidizing

20. Which of the following statements is true?

I. Gas has a indefinite shape and volumeII. Mass can be created

A. I onlyB. II onlyC. Both I and IID. Neither I nor II

21. A Kelvin reading of 125 K is the same as

A. -148 oCB. 398 oCC. -125 oCD. 125 oC

22. An example of an intensive property is

A. LengthB. Boiling pointC. MassD. Volume

23. Which of the following is a heterogeneous mixture?

A. Table saltB. SucroseC. Salad dressingD. Baking soda

24. 0.0035 x 105 in correct scientific notation is

A. 3.5 x 108

B. 3.5 x 102

C. 3.5 x 10-5

D. 3.5 x 104

• 1. D 7. B 13. D 19. B• 2. D 8. C 14. B 20. A• 3. A 9. B 15. B 21. A• 4. C 10. C 16. A 22. B• 5. B 11. B 17. D 23. C• 6. C 12. B 18. D 24. B