Understanding Main Ideas Answer the following questions in the spaces provided.
1. How are line graphs used to show how two variables are related?
2. What does a line of best fit emphasize?
3. What does a slope tell you about changes in x and y?
4. Why are line graphs powerful tools in science?
Building Vocabulary
Match each term with its definition by writing the letter of the correct definition on
the line beside the term in the left column.
5. coordinate
6. graph
7. origin
8. slope
9. nonlinear graph
10. vertical axis
11. line of best fit
12. data point
13. horizontal axis
a. the point on the graph where the axes cross
b. the graph line that runs up and down
c. a line graph in which the data points do not fall
along a straight line
d. a point on a graph that displays a piece of data
e. a picture of information from a data table
f. the steepness of a graph line
g. a pair of numbers uşed to determine the position
of a point on a graph
h. the graph line that runs left to right
i. a smooth line that reflects a general pattern on a
graph

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.

Achemical reaction is done in the setup shown, resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?