HellBill » Hell Bill Area: » Help With Bills » Chemisty Help! 10 Points Please Help

  #1 (permalink)
: 8. How many grams are in a 5 pound sample? Express your answer in scientific notation with two significant figures. (1 pound = 453.592 grams)
(Points : 3)
2.26 x 102 g

2.268 x 103 g

1.1 x 104 g

2.3 x 103 g

9. Conditions for an experimental chemistry reaction require a temperature of 298 K. The temperature in the lab is 55°F. Which of the following must you do to meet the requirements? (°F= 9/5 (K - 273) + 32) (Points : 3)
increase the room temperature by 18 K
increase the room temperature by 22°F
decrease the room temperature by 12°C
decrease the room temperature by 33°F

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




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




12. 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)
150 kg

75 kg

7.5 kg

0.75 kg

13. A chemical reaction gives off 2,100 kJ of heat energy. About how many calories is this?
(1 calorie = 4.18 Joules)
(Points : 3)
5.0 x 106 calories

5.0 x 105 calories

5.0 x 104 calories

5.0 x 103 calories

14. On a graph of mass vs. volume, which of the following indicates the density of the substance?

(Points : 3)




15. Which of the following goes on the x-axis of a graph?
(Points : 3)
dependent variable values

trend line

independent variable values

graph title

16. Terry heats two different masses of substance A to different temperatures, and measures the amounts of both carbon dioxide and water produced. Which of the following is true about this experiment?
(Points : 3)
This experiment is uncontrolled because two gaseous products are measured.

This experiment is well controlled because only the mass of substance A is varied.

This experiment is uncontrolled because two different masses of substance A are used.

This experiment is well controlled because the masses of substance A and the products are varied.

17. 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

18. 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.

19. 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)
27 g

5.9 g

3.0 g

0.3 g

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



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  #2 (permalink)
: 13 questions x [2 points / question] = 26 points >> 10

so here's # 20:

An element contains atoms of just one kind

so Cl2 is the best answer b/c it only contains Cl atoms
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