Wednesday
November 26, 2014

Homework Help: science

Posted by Kiera Lisople on Monday, March 31, 2014 at 2:24pm.

1.  
Use the diagram to answer question 1.
description: particles have enough energy to break free from each other and can move around freely; particles spread out in different directions
 sketch:



What kind of substance is described?  (1 point)
solid
liquid
gas
molecule
2.  
Note: The item below has been reviewed and is scheduled to be updated. All students will receive full credit for any response to the following.

Equal amounts of thermal energy are applied to a 100 g sample of one substance and a 200 g sample of a different substance. What statement is always true?  (1 point)
The temperature of the first substance will rise more than the temperature of the second substance.
The temperature of the first substance will rise less than the temperature of the second substance.
The temperature of the sample with the higher specific heat will rise more than the sample with the lower specific heat.
The temperature of the sample with the lower specific heat will rise more than the sample with the higher specific heat.
3.  
The density of an object with a volume of 60.0 mL and a mass of 400.0 g is _____.  (1 point)
0.150 g/mL
2.89 g/mL
5.50 g/mL
6.67 g/mL
4.  
Refer to the table below to answer the question.
Densities of Some Common Materials 
Material
Density (g/cm3)
Air
0.0013
Gasoline
0.7
Wood (oak)
0.85
Water (ice)
0.9
Water (liquid)
1.0
Aluminum
2.7
Steel
7.8
Silver
10.5
Lead
11.3
Mercury
13.5
Gold
19.3

A 54-gram sample of an unknown material has a volume equal to 20 cm3. What is the identity of the substance?  (1 point)
lead
steel
aluminum
mercury
5.  
An ice cube, a glass of cold water, and a swimming pool are each exposed to the same amount of sunlight on a hot day. After five minutes, the ice cube is melted and the cold drink is two degrees warmer, but the temperature of the swimming pool remains unchanged. What is the best explanation for these observations?  (1 point)
The ice cube has a higher heat capacity than the glass of water and the pool.
The ice cube has a lower heat capacity than the glass of water and the pool.
The ice cube and the glass of water have higher heat capacities than the swimming pool.
The ice cube and the glass of water have lower heat capacities than the swimming pool.
6.  
A banana turning brown when exposed to the air is an example of  (1 point)
a heterogeneous mixture.
vaporization.
a chemical change.
an amorphous solid.
7.  
A puddle of water on the sidewalk evaporates and becomes water vapor. The water vapor travels through the air and comes into contact with a cold mirror. What happens next? Choose all that apply.  (2 points)
It becomes a solid.
It becomes a liquid.
The molecules gain energy.
The molecules lose energy.
8.  
Why did a portion of the tabletop get cold when Natasha placed her cold drink on the table?  (1 point)
The table’s molecules were vibrating more slowly in that area.
The table’s molecules had spread further apart in that area.
The table’s molecules had gained energy in that area.
The table’s molecules had become free of each other in that area.
9.  
What fact does Antoine Lavoisier’s work show?  (1 point)
The overall volume before a reaction is equal to the overall volume after a reaction.
The overall mass before a reaction is equal to the overall mass after a reaction.
The overall thermal energy before a reaction is equal to the overall thermal energy after a reaction.
The overall temperature before a reaction is equal to the overall temperature after a reaction.
10.  
How do liquid water, ice, and water vapor differ from one another?  (1 point)
They are different states of matter.
They are different compounds.
They are made of different kinds of molecules.
They are made of different kinds of atoms.
11.  
Use the chart to answer question 11.
Oxygen (O2) 
Carbon dioxide (CO2)
Water (H2O)
 contains 2 oxygen atoms per molecule
contains 2 oxygen atoms per molecule
contains 1 oxygen atom per molecule
 gas at room temperature
 gas at room temperature
 liquid or gas at room temperature
 flammable
 not flammable
 not flammable


A student compared some chemical and physical properties of three pure substances. Her data are recorded in the chart above. What is a logical conclusion the student can draw about pure substances?  (1 point)
Pure substances have the same chemical and physical properties.
Pure substances have the same chemical properties, but different physical properties.
Pure substances have the different chemical properties, but the same physical properties.
Pure substances have different chemical and physical properties.
12.  
Carl crumpled a piece of paper before throwing it into the trash can. Which is true about the paper after it was crumpled?  (1 point)
Its weight changed.
Its mass changed.
Its form changed.
Its density changed.
Use the chart to answer question 13.
A
B
melt 1 cup of butter
brown the meat in a frying pan  
chop an onion
boil 6 eggs
mix ingredients in a large bowl   
bake at 350 degrees
13.  
Kendra was looking at recipes in a cookbook. She divided some of the steps of a recipe into two columns. How would you label each column?  (1 point)
Column A shows sublimation; column B shows vaporization.
Column A shows vaporization; column B shows sublimation.
Column A shows physical changes; column B shows chemical changes.
Column A shows chemical changes; column B shows physical changes.
Fill in the Blank

The item below has been reviewed and is scheduled to be updated. Please insert chemical as the answer to receive full credit for this question.
14.  
A property of matter describes its ability to change into different substances.  (1 point)

Use the picture to answer question 15.

 
15.  
The individual substances of the mixture shown above are easily distinguished and easily separated. This is an example of what kind of mixture?  (1 point)

16.  
The ratio of the mass of a substance to its volume is called ___.  (1 point)

17.  
A ___, such as H2SO4, is a symbol that shows the elements in a compound and the ratio of atoms.  (1 point)

18.  
When molecules of water vapor in the air come into contact with a cold can of soft drink, they lose energy, slow down, and form a liquid due to a decrease in ___.  (1 point)

19.  
The contents of a can of air freshener are gaseous when sprayed, but remain a liquid while in the can due to ___.  (1 point)

20.  
A ___ is two or more substances that are together in the same place but are not chemically combined.  (1 point)

21.  
When exposed to the same amount of heat for the same amount of time, a 3 g sample of copper will experience a greater temperature change than a 12 g sample of copper due to its smaller ___.  (1 point)

22.  
A property of matter that can be observed without changing the matter into a new substance is known as ______.  (1 point)

23.  
A substance made of two or more elements chemically combined in a set ratio, or proportion, is called a ___.  (1 point)

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