Q: Which of the following is the correct conversion of $$95.7\ pm ($$picometers) to nanometers?

$$9.57 \times 10$$^{-2}$$\ nm$$

Question 1

Which of the following statements best describes a chemical property?

Accepted Answer

Copper reacts with oxygen to form copper oxide.

Question 2

A student measures the mass of a leaf as $$0.45\ g. $$Which SI base unit and prefix multiplier is most appropriate for this measurement?

Accepted Answer

$$0.45\ g$$

Question 3

Which of the following changes is a chemical change?

Accepted Answer

Iron rusting when exposed to air.

Question 4

A pediatrician prescribes amoxicillin at a dose of $$75\ mg/kg$$ per day, divided into two doses. The child weighs $$28\ lb$$ and the liquid contains $$125\ mg/mL. $$How many mL should be administered per dose? ($$1\ kg = 2.205\ lb)$$

Accepted Answer

$$7.5\ mL$$

Question 5

Which of the following is the correct scientific notation for the number $$54095$$ with the correct number of significant figures?

Accepted Answer

$$5.4095 	imes 10^4$

Question 6

A piece of galena is added to a graduated cylinder containing $$19.9\ mL of $$water, increasing the volume to $$24.5\ mL. $$What is the volume of the galena in liters?

Accepted Answer

$$4.6 	imes 10$$^{-3}$$\ L$$

Question 7

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 8

Convert $$21.1^\circ C to $$Kelvin.

Accepted Answer

$$294.25\ K$$

Question 9

A chemist determines the density of a liquid by measuring $$30.5\ g$$ for $$38.6\ mL. $$Which substance is it most likely to be?

Accepted Answer

Ethylene glycol ($$1.114\ g/mL)$$

Question 10

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros after a decimal point and after a nonzero digit are always significant.

Question 11

A tennis ball of mass $$58.0\ g is $$served at $$128.6\ mi/h$$ ($$57.5\ m/s). $$What is its kinetic energy in Joules? ($$KE = \frac{1}{2}mv^2$)

Accepted Answer

$$95.6\ J$$

Question 12

Which of the following is the correct conversion of $$5.70\ L to $$cubic inches? ($$1\ mL = 1\ cm^3$, 1$$\ in = 2.54\ cm$$)

Accepted Answer

$$348\ in^3$

Question 13

Which of the following is the correct density calculation for a substance with mass $$30.5\ g$$ and volume $$38.6\ mL$$?

Accepted Answer

$$0.791\ g/mL$$

Question 14

Which of the following is the correct conversion of $$95.7\ pm ($$picometers) to nanometers?

Accepted Answer

$$9.57 	imes 10$$^{-2}$$\ nm$$

Question 15

Which of the following is the correct answer for $$6.3521 - 1.448$$ rounded to the correct number of significant figures?

Accepted Answer

$$4.90$$

Question 16

Which of the following is the correct SI base unit for temperature?

Accepted Answer

$$K$$

Question 17

Which of the following is the correct conversion factor to convert $$15$$ miles to kilometers? ($$1$$ mile $$= 1.609 km)$$

Accepted Answer

$$15 	imes 1.609$$

Question 18

Which of the following is the correct formula for calculating the volume of a cube?

Accepted Answer

$$V = a^3$

Question 19

Which of the following is the correct expression for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 20

Which of the following is the correct conversion of $$36.2$$ miles per gallon to kilometers per liter? ($$1$$ mile $$= 1.609 km$$, $$1$$ gallon $$= 4$$ quarts, $$1 L$$ $$= 1.057$$ quarts)

Accepted Answer

$$15.4\ km/L$$

Chapter 1: Units of Measurement, Physical and Chemical Change

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