Q: If you have 8 chemistry books out of a total of 32 books, what percentage of the books are chemistry books?

$\frac{8}{32} \times 100\% = 25\%$

Q: A student finds that 5% of the balls in a box are red. If there are 200 balls in the box, how many are red?

$0.05 \times 200 = 10$ red balls

Question 1

What is the place value of the digit 4 in the number 6.407?

Accepted Answer

Tenths

Question 2

A nurse records a patient's temperature as 39.4°C at 0 minutes and 38.0°C at 40 minutes after administering medication. What is the decrease in temperature, in degrees Celsius, during this time?

Accepted Answer

$39.4 - 38.0 = 1.4$ degrees Celsius

Question 3

Which of the following best describes the relationship between the volume of a gas in a balloon and its temperature, as shown in a direct linear graph?

Accepted Answer

As temperature increases, the volume increases.

Question 4

What is the result of $(-2) 	imes 3$?

Accepted Answer

$-6$

Question 5

If you have 8 chemistry books out of a total of 32 books, what percentage of the books are chemistry books?

Accepted Answer

$\frac{8}{32} 	imes 100\% = 25\%$

Question 6

Solve for $x$ in the equation $2x + 8 = 14$.

Accepted Answer

$x = 3$

Question 7

Which of the following is the correct rule for adding a positive and a negative number?

Accepted Answer

Subtract the smaller absolute value from the larger and use the sign of the larger number.

Question 8

A silver coin has a mass of 6.407 grams. What is the place value of the digit 7?

Accepted Answer

Thousandths

Question 9

Which operation will result in a positive answer?

Accepted Answer

$(-2) \div (-3)$

Question 10

If a graph shows time on the x-axis and temperature on the y-axis, which variable is the independent variable?

Accepted Answer

Time

Question 11

A patient’s temperature drops from 39.0°C to 37.5°C over 30 minutes. What is the average rate of temperature decrease per minute?

Accepted Answer

$\frac{39.0 - 37.5}{30} = 0.05$ °C/min

Question 12

Which of the following is the correct result for $-12 - (-5)$?

Accepted Answer

$-7$

Question 13

A graph shows a straight line with a positive slope. What does this indicate about the relationship between the two variables?

Accepted Answer

As one variable increases, the other increases.

Question 14

Which of the following is the correct way to subtract $12 - (-5)$?

Accepted Answer

$12 + 5 = 17$

Question 15

If a number is less than zero, which of the following statements is true?

Accepted Answer

It is a negative number and is written with a negative sign.

Question 16

A student finds that 5% of the balls in a box are red. If there are 200 balls in the box, how many are red?

Accepted Answer

$0.05 	imes 200 = 10$ red balls

Question 17

Which of the following is the correct result for $(-3) + (-4)$?

Accepted Answer

$-7$

Question 18

If the underlined digit in 35.6 is 6, what is its place value?

Accepted Answer

Tenths

Question 19

A graph shows the volume of a gas in a balloon at different temperatures. If the temperature is on the x-axis and the volume is on the y-axis, what does the slope of the line represent?

Accepted Answer

The rate at which volume changes with temperature

Question 20

Which of the following is the correct result for $2 \div 3$?

Accepted Answer

$0.666...$

Key Math Skills for Chemistry: Foundational Concepts for GOB Chemistry

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