Q: Which of the following is the correct conversion factor to change centimeters to inches?

$$1\ \text{in} = 2.54\ \text{cm}$$

Q: What is the correct formula to calculate the energy required to heat a substance?

$$q = m \times c \times \Delta T$$

Q: A gold crown is tested for purity by measuring its mass and the volume of water it displaces. If the crown has a mass of 193.2 g and displaces 10.0 mL of water, what is its density and what does this suggest about its composition?

Density is $$19.32\ \text{g/mL}$$, suggesting it is pure gold.

Q: Which of the following is the correct relationship between calories and joules?

$$1\ \text{cal} = 4.184\ \text{J}$$

Question 1

Which of the following correctly expresses the number 0.00000008 meters in scientific notation?

Accepted Answer

$$8.0 	imes 10$$^{-8}$$

Question 2

A child is prescribed a maximum of 1.625 g of acetaminophen per day. If the syrup contains 160 mg per 5 mL, what is the maximum volume (in mL) that can be given per day?

Accepted Answer

$$50.8\ 	ext{mL}$$

Question 3

Which of the following is the correct conversion factor to change centimeters to inches?

Accepted Answer

$$1\ 	ext{in} = 2.54\ 	ext{cm}$$

Question 4

A block of metal has a mass of 193.2 g and a volume of 10.0 mL. What is its density?

Accepted Answer

$$19.32\ 	ext{g/mL}$$

Question 5

Which SI prefix represents $$10^{-6}$$?

Accepted Answer

micro-

Question 6

How much energy (in calories) is required to heat 100 g of water from $$25^{\circ}$$	ext{C}$$ to 99$$^{\circ}$$	ext{C}$$? (Specific heat of water = $$1.00\ 	ext{cal/g}^{\circ}	ext{C})$$

Accepted Answer

$$7,400\ 	ext{cal}$$

Question 7

Which process describes the direct conversion of a solid to a gas?

Accepted Answer

Sublimation

Question 8

A saline solution contains 0.9 g NaCl in 1 L of water. What is the concentration in percent (w/w) if the density of the solution is $$1.0046\ 	ext{g/mL}$$?

Accepted Answer

$$0.9\%$$

Question 9

Which of the following statements about the atomic structure is correct?

Accepted Answer

The nucleus contains most of the atom’s mass.

Question 10

How much energy (in calories) is required to melt 100 g of ice at $$0^{\circ}$$	ext{C}$$? (Heat of fusion for ice = 80$$\ 	ext{cal/g}$$)

Accepted Answer

$$8,000\ 	ext{cal}$$

Question 11

A Built Bar contains 17 g of protein, 2.5 g of fat, and 6 g of carbohydrate. Using the typical energy values, what is the total energy content (in kcal) from these macronutrients?

Accepted Answer

$$102\ 	ext{kcal}$$

Question 12

Which of the following elements is a noble gas?

Accepted Answer

Neon

Question 13

What is the correct formula to calculate the energy required to heat a substance?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 14

Which of the following is the correct scientific notation for the U.S. national debt of $31,500,000,000,000?

Accepted Answer

$$3.15 	imes 10$$^{13}$$

Question 15

Which of the following best describes why an object floats in water?

Accepted Answer

It displaces a volume of water that weighs more than the object.

Question 16

Which of the following is the correct order of magnitude for a nanometer?

Accepted Answer

$$10^{-9}$$

Question 17

A gold crown is tested for purity by measuring its mass and the volume of water it displaces. If the crown has a mass of 193.2 g and displaces 10.0 mL of water, what is its density and what does this suggest about its composition?

Accepted Answer

Density is $$19.32\ 	ext{g/mL}$$, suggesting it is pure gold.

Question 18

Which of the following is NOT a correct SI base unit and its quantity?

Accepted Answer

Gram (g) for mass

Question 19

Which of the following best describes the difference between kinetic and potential energy?

Accepted Answer

Kinetic energy is energy of motion; potential energy is stored energy.

Question 20

Which of the following is the correct relationship between calories and joules?

Accepted Answer

$$1\ 	ext{cal} = 4.184\ 	ext{J}$$

Fundamental Concepts in Chemistry: Measurements, Matter, and Atomic Structure

Guida di studio - Domande di pratica

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