Author Question: The ratio of substance X to substance Y in a solution is measured in two separate trials. The ... (Read 49 times)

ts19998 · **on:** Jun 25, 2018

The ratio of substance X to substance Y in a solution is measured in two separate trials. The concentrations, ratios of X/Y, and log(X/Y) are presented in this table.

Trial Concentration of X Concentration of Y Ratio X/Y log(X/Y)
1 20 10 2 0.301
2 10 20 0.5 ?

What is the log of X/Y from trial 2?
A) 0.301
B) -0.301
C) 3.01
D) -3.01

Question 2

Consider the following expression. 9 - (-3) Which of the following expressions is another way of writing this?

A) 3 + 9
B) 3 - 9
C) 9 + 3
D) 9 - 3