Question 1

In the number 7.3288, what is the place value of the bold digit 2?

Accepted Answer

Hundredths

Question 2

In the number 16.1234, what is the place value of the bold digit 1?

Accepted Answer

Tenths

Question 3

In the number 4675.99, what is the place value of the bold digit 9?

Accepted Answer

Hundredths

Question 4

In the number 97.5689, what is the place value of the bold digit 8?

Accepted Answer

Thousandths

Question 5

In the number 375.88, what is the place value of the bold digit 8?

Accepted Answer

Hundredths

Question 6

In the number 46.1000, what is the place value of the bold digit 1?

Accepted Answer

Tenths

Question 7

Evaluate $$15 - (-8).$$

Accepted Answer

$$23$$

Question 8

Evaluate $$-8 + (-22).$$

Accepted Answer

$$-30$$

Question 9

Evaluate $$4 	imes (-2) + 6.$$

Accepted Answer

$$-2$$

Question 10

A solution contains 25 g of NaCl in 200 g of water. What is the percentage by mass of NaCl in the solution?

Accepted Answer

$$11.1\%$$

Question 11

A graph shows the temperature of a chemical reaction increasing from $$20^\circC to$$ $$80^\circC $$over 30 minutes. What is the average rate of temperature change?

Accepted Answer

$$2^\circC/$$min$

Question 12

A patient’s blood glucose level drops from 120 mg/dL to 90 mg/dL in 2 hours. What is the percentage decrease?

Accepted Answer

$$25\%$$

Question 13

If a chemical reaction yields 45 g of product from 60 g of reactant, what is the percent yield?

Accepted Answer

$$75\%$$

Question 14

Which of the following best describes the place value of the digit 5 in the number 0.056?

Accepted Answer

Thousandths

Question 15

A graph shows the concentration of a reactant decreasing exponentially over time. What does this suggest about the reaction order?

Accepted Answer

First order

Question 16

A student mixes 10 mL of acid with 90 mL of water. What is the percentage of acid in the final solution?

Accepted Answer

$$10\%$$

Question 17

If a graph shows a straight line with a positive slope, what does this indicate about the relationship between the two variables?

Accepted Answer

There is a direct proportional relationship.

Question 18

A chemical solution is diluted from 0.50 M to 0.10 M. What is the percentage decrease in concentration?

Accepted Answer

$$80\%$$

Question 19

Solve for $$x in $$the equation $$2x + 5 = 17.$$

Accepted Answer

$$x = 6$$

Fundamental Math Concepts for GOB Chemistry: Place Value, Integers, and Basic Calculations

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