Thursday
December 18, 2014

Homework Help: Science

Posted by Annabelle Hartz on Tuesday, May 7, 2013 at 12:22pm.

Please check my answers (at the bottom) with these questions.

1. An apple quickly changes color when exposed to air. This demonstrates a ________. (1 point)
physical property
chemical property
physical change
all of the above


2. When a chunk of dry ice is at room temperature, a cloud of carbon dioxide vapor forms. The carbon dioxide is changing from a ____. (1 point)
solid to a liquid
solid to a gas
liquid to plasma
liquid to a gas


3. A solution that contains all the solute it can hold under the given conditions is ____. (1 point)
saturated
unsaturated
diluted
supersaturated


4. Which of the following properties is not characteristic of acidic solutions? (1 point)
has a sour taste
conducts electricity
feels slippery
is corrosive to certain metals


5. When aqueous solutions of table salt and silver nitrate are mixed, a white solid forms. This solid is ____. (1 point)
soluble
a precipitate
an alloy
a solute


6. Stainless steel is an example of a ____ solution. (1 point)
liquid-solid
solid-liquid
solid-solid
gas-solid


7. Which of the following correctly describes a solution with pH of 2? (1 point)
weakly acidic
weakly basic
strongly acidic
strongly basic


9. The freezing point of a substance is ________ the melting point of the same substance. (1 point)
greater than
less than
equal to
unrelated to


10. For most substances, the distance between particles is smallest when the substance _________. (1 point)
exists as a gas
exists as a liquid
exists as a crystalline solid
exists as an amorphous solid


11. Which of the following factors does not affect the behavior of a gas in a closed container? (1 point)
the number of particles
the average kinetic energy
the cohesive forces within the gas
the size of the container


12. Pascal's principle can be applied to ____. (1 point)
all states of matter
solids and gases only
solids and liquids only
liquids and gases only


13. Particles with more energy move __________ than particles with less energy. (1 point)
slower and closer together
faster and farther apart
faster and closer together
slower and farther apart


15. During an experiment, you find that you can dissolve 3.6 g of a substance in 300 mL of water at 25C. How much of the substance would you predict that you could dissolve in 600 mL of water at the same temperature? (1 point)
1.8 g
3.6 g
7.2 g
5.4 g


16. Which of the items below is an example of a base in your everyday life? (1 point)
soap
chalk
blood
all of the above


ANSWERS:

1.B
2.B
3.A
4.C
5.B
6.C
7.C
9.B
10.C
11.C
12.D
13.B
15.C
16.D

Thank you for all who helps out!

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