Q: A sample of aluminum weighing 156 g is heated from 21.9 °C to 128 °C. The specific heat of aluminum is 0.220 cal/g·°C. How many calories are needed to heat the aluminum?

$$\text{Calories} = 156 \times 0.220 \times (128 - 21.9) = 3,646$$ cal

Q: Convert 2.75 kilograms to milligrams.

$$2.75 \text{ kg} \times \frac{10^6$ \text{ mg}}{1 \text{ kg}} = 2.75 \times 10^6$ \text{ mg}$$

Q: A doctor orders that a patient receives 200 mg of ampicillin. The stock solution is supplied as 500 mg per 10 mL. What volume of medication does the patient receive?

$$\frac{200 \text{ mg}}{500 \text{ mg}} \times 10 \text{ mL} = 4 \text{ mL}$$

Q: If you apply 450 cal of heat to a 150 g sample of metal, raising its temperature from 27.0 °C to 134 °C, what is the specific heat of the metal?

$$\text{SH} = \frac{450}{150 \times (134 - 27)} = 0.028$$ cal/g·°C

Q: A 25.0 mL sample of an unknown liquid has a mass of 17.2 g. What is the density of the liquid?

$$d = \frac{17.2\ \text{g}}{25.0\ \text{mL}} = 0.688\ \text{g/mL}$$

Q: Which of the following is the correct conversion of 384 liters to milliliters?

$$384\ \text{L} \times \frac{1000\ \text{mL}}{1\ \text{L}} = 384,000\ \text{mL}$$

Question 1

A sample of aluminum weighing 156 g is heated from 21.9 °C to 128 °C. The specific heat of aluminum is 0.220 cal/g·°C. How many calories are needed to heat the aluminum?

Accepted Answer

$$	ext{Calories} = 156 	imes 0.220 	imes (128 - 21.9) = 3,646$$ cal

Question 2

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 3

Convert 2.75 kilograms to milligrams.

Accepted Answer

$$2.75 	ext{ kg} 	imes \frac{10^6$ 	ext{ mg}}{1 	ext{ kg}} = 2.75 	imes 10^6$ 	ext{ mg}$$

Question 4

Which orbital has the lowest energy in an atom?

Accepted Answer

1s

Question 5

A doctor orders that a patient receives 200 mg of ampicillin. The stock solution is supplied as 500 mg per 10 mL. What volume of medication does the patient receive?

Accepted Answer

$$\frac{200 	ext{ mg}}{500 	ext{ mg}} 	imes 10 	ext{ mL} = 4 	ext{ mL}$$

Question 6

Which of the following is the correct electron configuration for potassium (K)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^1$$

Question 7

What is the shape and polarity of the CO$$_2$$ molecule?

Accepted Answer

Linear and nonpolar

Question 8

If you apply 450 cal of heat to a 150 g sample of metal, raising its temperature from 27.0 °C to 134 °C, what is the specific heat of the metal?

Accepted Answer

$$	ext{SH} = \frac{450}{150 	imes (134 - 27)} = 0.028$$ cal/g·°C

Question 9

Which of the following is the correct formula for magnesium oxide?

Accepted Answer

MgO

Question 10

A 25.0 mL sample of an unknown liquid has a mass of 17.2 g. What is the density of the liquid?

Accepted Answer

$$d = \frac{17.2\ 	ext{g}}{25.0\ 	ext{mL}} = 0.688\ 	ext{g/mL}$$

Question 11

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 12

Which of the following is the correct conversion of 384 liters to milliliters?

Accepted Answer

$$384\ 	ext{L} 	imes \frac{1000\ 	ext{mL}}{1\ 	ext{L}} = 384,000\ 	ext{mL}$$

Question 13

Which of the following best describes the process of melting ice to form water?

Accepted Answer

Physical change

Question 14

Which of the following is the correct formula for beryllium chloride?

Accepted Answer

BeCl$$_2$$

Question 15

How many significant figures are in the number 0.0140730?

Accepted Answer

6

Question 16

Which of the following is the correct electron configuration for aluminum (Al)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^1$$

Question 17

Which of the following molecules is polar and has a bent shape?

Accepted Answer

H$$_2O$$

Question 18

Which of the following is the correct formula for copper(II) chloride?

Accepted Answer

CuCl$$_2$$

Question 19

Which of the following best describes the energy change when diesel fuel in a truck is used to move the vehicle?

Accepted Answer

Potential energy is converted to kinetic energy

GOB Chemistry Study Guide: Atomic Structure, Measurement, Chemical Bonding, and Properties

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