Question 1

Which of the following best describes the place value of the digit 4 in the number 6.407?

Accepted Answer

Tenths

Question 2

A patient receives a medication dose of 0.000 025 g. How should this value be correctly written in scientific notation?

Accepted Answer

$$2.5 	imes 10$$^{-6}$$ g

Question 3

If a laboratory sample has a mass of 15.24 g, what is the place value of the digit 2?

Accepted Answer

Tenths

Question 4

A chemist multiplies $$-4 by$$ $$-7. $$What is the result and why?

Accepted Answer

$$28$$, because multiplying two negatives gives a positive

Question 5

A solution contains 250 mg of solute in a total mass of 500 mg. What is the percentage of solute in the solution?

Accepted Answer

$$50\%$$

Question 6

Which of the following is the correct way to solve for $$P_1 in $$the equation $$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$?

Accepted Answer

$$P_1$$ = \dfrac{$$P_2$$ $$V_2$$}{$$V_1$$}$$

Question 7

A graph shows the volume of a gas increasing as the temperature increases. What type of relationship is this?

Accepted Answer

Direct relationship

Question 8

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$4.5 	imes 10^2$

Question 9

A COVID-19 virus particle has a diameter of $$0.000 12 m. $$What is this value in scientific notation?

Accepted Answer

$$1.2 	imes 10$$^{-5}$$ m

Question 10

A student subtracts $$-12$$ from $$-5. $$What is the result?

Accepted Answer

$$-7$$

Question 11

If you add $$+8$$ and $$-15$$, what is the result and what is the sign?

Accepted Answer

$$-7$$, negative

Question 12

A scientist records the mass of a sample as $$2.36 	imes 10^4$ g. What is this value in standard notation?

Accepted Answer

$$23,600 g$$

Question 13

Which of the following best describes the process for subtracting $$12 - (-5)$$?

Accepted Answer

Add 5 to 12

Question 14

A graph shows the temperature of a balloon on the x-axis and the volume on the y-axis. What does the slope of the line represent in this context?

Accepted Answer

The rate at which volume changes with temperature

Question 15

Which of the following is the correct result for $$(-2) 	imes 3$$?

Accepted Answer

$$-6$$

Question 16

A medication contains 325 mg of active ingredient in a 545 mg tablet. What is the percentage of active ingredient in the tablet?

Accepted Answer

$$59.6\%$$

Question 17

Which of the following is the correct scientific notation for the number 0.000 021?

Accepted Answer

$$2.1 	imes 10$$^{-5}$$

Question 18

If you divide $$-6 by$$ $$3$$, what is the result?

Accepted Answer

$$-2$$

Question 19

Which of the following is true about the coefficient in scientific notation?

Accepted Answer

It must be at least 1 but less than 10

Question 20

A student enters $$1.2 	imes 10$$^{-7}$$ into a calculator using the EE key. Which of the following is the correct display?

Accepted Answer

1.2E-7

Key Math Skills for Chemistry: Foundations for GOB Chemistry

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