Q: Which equation correctly relates density, mass, and volume?

$$\text{Density} = \dfrac{\text{Mass}}{\text{Volume}}$$

Q: A sample of water is heated from $$25^\circ\text{C} to$$ $$75^\circ\text{C}. $$Which formula should be used to calculate the heat absorbed, given the specific heat ($$c) $$and mass ($$m) of $$water?

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

Question 1

Which of the following best describes a physical change?

Accepted Answer

Dissolving sugar in water

Question 2

A student measures the mass of a sample as 12.345 g. If the balance used has a precision of 0.01 g, how should the mass be reported using significant figures?

Accepted Answer

12.35 g

Question 3

Which of the following is a heterogeneous mixture?

Accepted Answer

Oil and water

Question 4

A patient receives 500 mL of saline solution. What is this volume in liters? ($$1 	ext{ L} = 1000 	ext{ mL})$$

Accepted Answer

$$0.5 	ext{ L}$$

Question 5

Which statement about the periodic table is correct?

Accepted Answer

Elements in the same group have the same number of valence electrons.

Question 6

Which equation correctly relates density, mass, and volume?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{Mass}}{	ext{Volume}}$$

Question 7

A sample of water is heated from $$25^\circ	ext{C} to$$ $$75^\circ	ext{C}. $$Which formula should be used to calculate the heat absorbed, given the specific heat ($$c) $$and mass ($$m) of $$water?

Accepted Answer

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

Question 8

Which of the following best describes the process of condensation?

Accepted Answer

A gas changing to a liquid

Question 9

A solution has a density of $$1.20 	ext{ g/mL}. $$What is the mass of $$250 	ext{ mL} of $$this solution?

Accepted Answer

$$300 	ext{ g}$$

Question 10

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 11

Which of the following elements is an alkali metal?

Accepted Answer

Sodium

Question 12

A sample of ice at $$0^\circ	ext{C}$$ absorbs $$334 	ext{ J/g} to $$melt. What is this energy called?

Accepted Answer

Heat of fusion

Question 13

Which of the following best describes a chemical property?

Accepted Answer

Ability to react with oxygen

Question 14

A patient’s blood sample has a mass of $$5.0 	ext{ g}$$ and a volume of $$4.8 	ext{ mL}. $$What is the density of the blood sample?

Accepted Answer

$$0.96 	ext{ g/mL}$$

Question 15

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 16

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 17

Which of the following best describes the process of vaporization?

Accepted Answer

A liquid changing to a gas

Question 18

A sample of metal has a mass of $$45.0 	ext{ g}$$ and a volume of $$15.0 	ext{ mL}. $$What is its density?

Accepted Answer

$$3.0 	ext{ g/mL}$$

Question 19

Which of the following is the correct symbol for an atom with 17 protons, 18 neutrons, and 17 electrons?

Accepted Answer

$$^{35}	ext{Cl}$$

Question 20

Which of the following is the correct order of increasing energy for electromagnetic radiation?

Accepted Answer

Visible \u003c Ultraviolet \u003c X-rays

GOB Chemistry Exam 1 Review: Chemistry in Our Lives, Matter & Energy, Atoms & Elements

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