HellBill » Hell Bill Area: » Help With Bills » Please help, i'm really bad at chemistry and i can't fail this test.

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: 1. For which of the following activities might you want to hire a chemist?
(Points : 3)
building a garage

testing a sample of water from a well

finding a comet

examining the structure of plant cells



2. Which of the following procedures involves a physical change in one of the substances?
(Points : 3)
creating salt by reacting sodium metal and chlorine gas

allowing a nail to rust

building a model rocket propelled by mixing baking soda and vinegar

grinding chalk into a fine powder



3. You have three molecules of glucose (3C6H12O6). How many oxygen atoms do you have?
(Points : 3)
18

6

3



1



4. Which of the following is a homogenous mixture of two or more pure substances?
(Points : 3)
coffee

water

alcohol

hot chocolate



5. Which of the following is a chemical property?
(Points : 3)
ability to become magnetic

ability to conduct electricity

ability to conduct heat

ability to react with acid



6. You heat two substances, A and B. Both substances change color. When cooled, substance B returns to its original color, but substance A does not. What most likely happened?
(Points : 3)
A chemical change occurred in both substances.

A physical change occurred in both substances.

A physical change occurred in substance A, and a chemical change occurred in substance B.

A chemical change occurred in substance A, and a physical change occurred in substance B.



7. Jim, Jane, Ann, and Bill measure an object's length, density, mass, and volume, respectively. Which student's measurement might be in kilograms?
(Points : 3)
Jim's

Jane's

Ann's

Bill's



8. How many meters are in 0.05 kilometers?
(Points : 3)
50

500

5,000

50,000



9. A container has the dimensions of 30 cm x 50 mm x 0.2 m. The density of its contents is 2.5 g/cm3. What is the mass of the substance in kilograms? (D = m/V)
(Points : 3)
0.75 kg

7.5 kg

75 kg

150 kg



10. A chemical reaction gives off 1,500 kJ of heat energy. About how many calories is this? (1 calorie = 4.18 Joules)
(Points : 3)
3.6 x 102 calories

3.6 x 103 calories

3.6 x 104 calories

3.6 x 105 calories





12. In terms of the sequence of the scientific method, what is the immediate purpose of doing an experiment?
(Points : 3)
drawing conclusions

asking the question

formulating the hypothesis

gathering data



13. Which of the following describes a physical property?
(Points : 3)
When two substances are mixed a precipitate forms

Gunpowder explodes

A substance changes color when heated, but changes back when cooled.

A candle burns.



14. A material has a density of 8.9 g/cm3. You have three cubic centimeters of the substance. What is the material's mass in grams?
(Points : 3)
0.3 g

3.0 g

5.9 g

27 g



15. Which of the following describes an element?
(Points : 3)
H2O

CH4

H2SO4

N2
I only have 40 min left to complete it
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