1,001 Chemistry Practice Problems For Dummies (2014)
Part I. The Questions
Chapter 15. Graphing Basics
Graphs are a visual means of summarizing data. A good graph gives more information than a simple table of x and y values. Bad graphs can be very misleading. Scientists need to be able to transmit information in the form of good graphs.
The Problems You’ll Work On
In this chapter, you work with graphing basics in the following ways:
Identifying parts of a graph
Determining graph scales
Drawing and interpreting graphs
Predicting values
What to Watch Out For
Remember the following when working on graphing:
Very few graphs simply connect the data points.
The more neatly a graph is drawn, the easier it is to read.
The graph should occupy most, if not all, of the space available.
The scales should place the highest values near the top or right of the graph. The lowest values should appear near the bottom or left of the graph.
Graphing
981–1,001 Answer the following questions on graphing. When data appears in a twocolumn format, the first column contains the data for the xaxis, and the second column contains the data for the yaxis. You can sketch the graphs by hand or use a program such as Excel.
981. What is the name of the position on the graph denoted by x = 0 and y = 0?
982. What do you call the process of finding a value on a graph that falls within the range of the plotted points?
983. What do you call the process of estimating a value on a graph that falls outside the range of the plotted points?
984. A plot of mass (yaxis) versus volume (xaxis) gives you a straightline plot. What does the intercept of this line with the xaxis represent?
985. A plot of volume (yaxis) versus temperature (xaxis) gives you a straightline plot. What does the intercept of this line with the xaxis represent?
986. In a graph of distance versus time, what does the slope of the line represent?
987. In a graph of mass versus volume, what does the slope of the line represent?
988. In a graph of heat energy versus temperature, what does the slope of the line represent?
989. According to Charles’s law, the volume of an ideal gas is directly proportional to the temperature of the gas. What does a graph of volume versus temperature look like?
990. According to Boyle’s law, the pressure of an ideal gas is inversely proportional to the volume of the gas. What does a graph of volume versus pressure look like?
991. What does a graph of the volume (yaxis) versus the edge of a cube (xaxis) look like?
992. Graph the following data with a line of best fit. Use your graph to estimate how many pennies would be in a stack that has a mass of 84.1 g.
Number of Pennies 
Mass (g) 
5 
15.2 
10 
31.5 
15 
46.2 
20 
60.4 
25 
77.3 
30 
91.7 
993. In a graph depicting the following information, what does the slope of the line represent?
Number of Pennies 
Mass (g) 
5 
15.2 
10 
31.5 
15 
46.2 
20 
60.4 
25 
77.3 
30 
91.7 
994. Graph the following data with a line of best fit. Then use the graph to estimate the volume of 31.0 g of the substance.
Volume (mL) 
Mass (g) 
2.2 
11.9 
3.9 
28.2 
5.5 
37.7 
7.1 
48.9 
9.1 
60.1 
10.6 
76.0 
995. Graph the following data with a line of best fit. What is the mass of 10.0 mL of the substance?
Volume (mL) 
Mass (g) 
2.2 
11.9 
3.9 
28.2 
5.5 
37.7 
7.1 
48.9 
9.1 
60.1 
10.6 
76.0 
996. Graph the following data. Then use the graph to estimate the concentration at an absorbance of 0.318.
Concentration (M) 
Absorbance 
0.100 
0.385 
0.075 
0.300 
0.050 
0.187 
0.025 
0.099 
997. Graph the following data. Then use the graph to estimate the absorbance at a concentration of 0.125 M.
Concentration (M) 
Absorbance 
0.100 
0.385 
0.075 
0.300 
0.050 
0.187 
0.025 
0.099 
998. What is the xintercept of the bestfit line for the graph of the following data? (Hint: The xaxis should go from –300°C to +200°C.)
Temperature (°C) 
Volume (L) 
0.0 
1.00 
50.0 
1.18 
100.0 
1.37 
150.0 
1.55 
999. Describe the shape of the graph of the following data.
Volume (mL) 
pH 
0.00 
3.09 
5.00 
4.07 
10.00 
4.49 
13.00 
4.70 
16.00 
4.92 
19.00 
5.18 
22.00 
5.58 
23.00 
5.82 
24.00 
6.30 
24.25 
6.51 
24.50 
7.04 
24.75 
9.46 
24.90 
10.23 
25.00 
10.31 
25.10 
10.47 
25.25 
10.61 
25.50 
10.78 
25.75 
10.93 
26.00 
11.01 
27.00 
11.28 
28.00 
11.43 
31.03 
11.56 
1,000. Graph the following data for the titration of a weak acid with a strong base. Then use the graph to estimate the pH at 12.25 mL.
Volume (mL) 
pH 
0.00 
3.09 
5.00 
4.07 
10.00 
4.49 
13.00 
4.70 
16.00 
4.92 
19.00 
5.18 
22.00 
5.58 
23.00 
5.82 
24.00 
6.30 
24.25 
6.51 
24.50 
7.04 
24.75 
9.46 
24.90 
10.23 
25.00 
10.31 
25.10 
10.47 
25.25 
10.61 
25.50 
10.78 
25.75 
10.93 
26.00 
11.01 
27.00 
11.28 
28.00 
11.43 
31.03 
11.56 
1,001. A student conducts a kinetic experiment for a secondorder reaction. Graphing which two columns in the following table will produce a straight line?
Time (min) 
[A] (M) 
ln[A] 

0 
0.2000 
–1.61 
5.0 
5 
0.0282 
–3.57 
35.5 
10 
0.0156 
–4.17 
64.1 
15 
0.0106 
–4.55 
94.3 
20 
0.0080 
–4.83 
125 