Q: A patient is prescribed 250 mg of ampicillin every 6 hours. If the available suspension is 250 mg/5.0 mL, how many milliliters should be administered per dose?

$$ \frac{250\ \text{mg}}{250\ \text{mg}/5.0\ \text{mL}} = 5.0\ \text{mL} $$

Q: What is the density of an object with a mass of 200.0 g and a volume of 10.0 mL?

$$ \frac{200.0\ \text{g}}{10.0\ \text{mL}} = 20.0\ \text{g/mL} $$

Q: Convert 44 inches to centimeters. (1 inch = 2.54 cm)

$$ 44 \times 2.54 = 111.76\ \text{cm} $$

Q: A car travels 120 miles in 2.0 hours. What is its speed in miles per hour?

$$ \frac{120\ \text{miles}}{2.0\ \text{hours}} = 60\ \text{miles/hour} $$

Q: A beaker contains 50.0 mL of water at 25°C. If 4.18 J of heat is added, what is the temperature change? (Specific heat of water = $$4.18\ \text{J/g}^\circ\text{C}$$, density of water = $$1.00\ \text{g/mL})$$

$$ \Delta T = \frac{4.18\ \text{J}}{50.0\ \text{g} \times 4.18\ \text{J/g}^\circ\text{C}} = 0.02^\circ\text{C} $$

Question 1

Which of the following best describes evaporation?

Accepted Answer

A physical change because the substance changes state but not composition.

Question 2

A patient is prescribed 250 mg of ampicillin every 6 hours. If the available suspension is 250 mg/5.0 mL, how many milliliters should be administered per dose?

Accepted Answer

$$ \frac{250\ 	ext{mg}}{250\ 	ext{mg}/5.0\ 	ext{mL}} = 5.0\ 	ext{mL} $$

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning gasoline

Question 4

How many neutrons are in an atom of nitrogen-15?

Accepted Answer

$$ 15 - 7 = 8 $$ neutrons

Question 5

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that retain their individual properties.

Question 6

A sample of an element has an atomic number of 12 and a mass number of 24. How many protons, neutrons, and electrons does it have?

Accepted Answer

12 protons, 12 neutrons, 12 electrons

Question 7

Which of the following is the correct number of significant figures in the value 0.0490?

Accepted Answer

3

Question 8

What is the density of an object with a mass of 200.0 g and a volume of 10.0 mL?

Accepted Answer

$$ \frac{200.0\ 	ext{g}}{10.0\ 	ext{mL}} = 20.0\ 	ext{g/mL} $$

Question 9

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 10

Which element has the chemical symbol Zn?

Accepted Answer

Zinc

Question 11

Convert 44 inches to centimeters. (1 inch = 2.54 cm)

Accepted Answer

$$ 44 	imes 2.54 = 111.76\ 	ext{cm} $$

Question 12

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 13

A car travels 120 miles in 2.0 hours. What is its speed in miles per hour?

Accepted Answer

$$ \frac{120\ 	ext{miles}}{2.0\ 	ext{hours}} = 60\ 	ext{miles/hour} $$

Question 14

Which of the following is a compound?

Accepted Answer

Sodium chloride

Question 15

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 16

Which of the following is the correct answer to $$4.192 + 19.303 + 4.1$$ with the correct number of significant figures?

Accepted Answer

$$ 27.6 $$

Question 17

Which of the following best describes the nucleus of an atom?

Accepted Answer

It contains protons and neutrons and is positively charged.

Question 18

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 19

Which of the following is the correct name for the element with the symbol K?

Accepted Answer

Potassium

Question 20

A beaker contains 50.0 mL of water at 25°C. If 4.18 J of heat is added, what is the temperature change? (Specific heat of water = $$4.18\ 	ext{J/g}^\circ	ext{C}$$, density of water = $$1.00\ 	ext{g/mL})$$

Accepted Answer

$$ \Delta T = \frac{4.18\ 	ext{J}}{50.0\ 	ext{g} 	imes 4.18\ 	ext{J/g}^\circ	ext{C}} = 0.02^\circ	ext{C} $$

GOB Chemistry Study Guide: Fundamental Concepts and Problem Solving

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