14
Figure 2
Figure 2
140
120
100
80
Relative
rate of
reaction
60
40
20
20
30
40 50
Tamarare in
60
70
The student investigated the effect of changing the temperature of the sodium thiosulfate
solution on the rate of reaction.
She plotted her results on a graph, as shown in Figure 2.
Describe the trends shown in the student's results. *
(2 Points)
Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.
Each step in the following process has a yield of 70% ch4 + 4cl2 yield ccl4 +4hcl ccl4 + 2hf yield ccl2f2 + 2hcl of 4.50 mole ch4 reacts what is the total amount of hcl produced