Q: Which of the following is the correct formula for calculating the density of a substance?

$\text{Density} = \frac{\text{mass}}{\text{volume}}$

Question 1

Which of the following best describes the physical state and particle arrangement of a liquid?

Accepted Answer

Has an indefinite shape but definite volume; particles are close together but mobile.

Question 2

A student heats a sample of ice at $0^\circ \mathrm{C}$ until it becomes liquid water at $0^\circ \mathrm{C}$. Which process and energy change is occurring?

Accepted Answer

Melting; heat is absorbed.

Question 3

Which of the following is a chemical change?

Accepted Answer

Caramelizing sugar at high temperature.

Question 4

A 48.0 g sample of metal is placed in a graduated cylinder containing 25.0 mL of water. The water level rises to 33.0 mL. What is the density of the metal in $\mathrm{g/cm^3}$?

Accepted Answer

$6.0\ \mathrm{g/mL}$

Question 5

Which statement about atoms is correct according to Dalton’s atomic theory?

Accepted Answer

Atoms of different elements combine to form compounds.

Question 6

A neutral atom of lead (Pb) has a mass number of 207 and an atomic number of 82. How many neutrons does it have?

Accepted Answer

125

Question 7

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas without becoming a liquid.

Question 8

Which subatomic particle is found outside the nucleus and has a negative charge?

Accepted Answer

Electron

Question 9

Which of the following is a physical property?

Accepted Answer

Copper is a good conductor of electricity.

Question 10

A sample of a substance has a mass of 25.0 g and a volume of 5.0 mL. What is its density?

Accepted Answer

$5.0\ \mathrm{g/mL}$

Question 11

Which of the following best explains why dry ice (solid CO$_2$) is used for shipping frozen foods?

Accepted Answer

It sublimes directly to a gas, absorbing heat and keeping food frozen.

Question 12

Which of the following statements about isotopes is true?

Accepted Answer

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

Question 13

Which of the following best describes the arrangement of electrons in the atom according to the modern model?

Accepted Answer

Electrons occupy a large, mostly empty space around a dense nucleus.

Question 14

Which of the following transitions involves the greatest absorption of energy by an electron?

Accepted Answer

From $n=1$ to $n=3$

Question 15

How many electrons can occupy the $3p$ sublevel in an atom?

Accepted Answer

6

Question 16

Which of the following is the correct formula for calculating the density of a substance?

Accepted Answer

$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$

Question 17

A sample has a density of $0.85\ \mathrm{g/mL}$. Will it float or sink in water, and why?

Accepted Answer

It will float because its density is less than water.

Question 18

Which of the following best describes the Pauli exclusion principle?

Accepted Answer

Each orbital can hold a maximum of two electrons with opposite spins.

Question 19

Which of the following is a real-life example of a physical change?

Accepted Answer

Melting wax to make candles.

States and Properties of Matter, Atomic Structure, and Electron Configuration – GOB Chemistry Study Notes (Week 2)

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