Quiz about Chemistry Review 2024

Question 1

The relative abundance of the three most common isotopes of titanium are shown in the image. Based on this data, what is the average atomic mass, in amu, of titanium?

Accepted Answer

C. 47.68

Answer

A. 46.95

Answer

B. 47.46

Answer

D. 47.87

Question 2

What is the correct name for the compound whose formula is Fe₂O₃?

Accepted Answer

iron(III) oxide

Answer

iron oxide

Answer

iron trioxide

Answer

iron(II) oxide

Question 3

The table lists some properties of a sample of lauric acid.

Which of these is an intensive property of this sample?

Accepted Answer

Boiling point

Answer

Volume

Answer

Mass

Answer

Number of moles

Question 4

How can a physical property be investigated?

Accepted Answer

Melting ice.

Answer

Letting milk turn sour.

Answer

Allowing silver to tarnish.

Answer

Burning wood.

Question 5

How many electrons does a neutral atom of silicon contain?

Accepted Answer

14 electrons.

Answer

28.09 electrons.

Answer

16 electrons.

Answer

38 electrons.

Question 6

What is the correct name for the compound whose formula is Na₂SO₄?

Accepted Answer

sodium sulfate

Answer

disodium sulfate

Answer

sodium sulfoxide

Answer

sodium sulfite

Question 7

Differentiate between fission and fusion.

Accepted Answer

Fission is when a heavy nuclei splits into two or more lighter nuclei. Fusion is when two lighter nuclei join to form a heavier nuclei.

Answer

It is when cells are changing and exchanging DNA material via the pila

Answer

Fusion is when a heavy nuclei splits into two or more lighter nuclei. Fission is when two lighter nuclei join to form a heavier nuclei.

Answer

Fission and fusion is when a heavy nuclei splits into two or more lighter nuclei.

Question 8

In the experiment conducted by Ernest Rutherford, which of the following is a conclusion that resulted from scattering alpha particles by a thin gold foil?

Accepted Answer

The nucleus is very small and the atom is mostly empty space.

Answer

The nucleus is negatively charged.

Answer

The atom is a dense solid and is indivisible.

Answer

The mass is conserved when atoms react chemically.

Question 9

The smallest unit of an element that can exist either alone or in combination with other

such particles of the same or different elements is the

Accepted Answer

atom

Answer

electron

Answer

proton

Answer

neutron

Question 10

Isotopes of an element differ in which of the following?

Accepted Answer

The mass number.

Answer

Atomic number.

Answer

The number of protons.

Answer

The total number of electrons.

Question 11

The following orbital notation represents which element from the periodic table:

Accepted Answer

B. S

Answer

A. Na

Answer

C. Ne

Answer

D. C

Question 12

Balance the following nuclear equation:

Accepted Answer

Question 13

Which of the following are indicators of a chemical change?

Accepted Answer

All are indicators of a chemical change

Answer

Precipitate formed

Answer

Gas formation

Answer

Heat

Question 14

Which of these statements is an accurate description of the ionization energies of elements in the periodic table?

Accepted Answer

The ionization energy of lithium is greater than that of potassium.

Answer

The ionization energy of iodine is greater than that of fluorine.

Answer

The ionization energy of magnesium is greater than that of sulfur.

Answer

The ionization energy of krypton is greater than that of neon.

Question 15

Based on the Lewis structure of hydrogen sulfide (H₂S), what is the shape of this molecule?

Accepted Answer

Bent

Answer

Linear

Answer

Trigonal planar

Answer

Tetrahedral

Question 16

Which of the following is not soluble in water?

Accepted Answer

Calcium carbonate

Answer

Sodium nitrate

Answer

Sodium carbonate

Answer

Calcium chloride

Question 17

Which element is most likely to have a sea of electrons?

Accepted Answer

Copper

Answer

Carbon

Answer

Oxygen

Answer

Hydrogen

Question 18

What is the pH of a substance that has a hydrogen ion concentration of 1.2 x 10^-2 M?

Accepted Answer

1.92

Answer

2.08

Answer

1.00

Answer

0.080

Question 19

The diagram below shows a gas with an initial pressure of 3060 mm Hg in a cylinder at a

constant temperature. The gas expands inside the cylinder and pushes the piston up.

Accepted Answer

784 mm Hg

Answer

800 mm Hg

Answer

750 mm Hg

Answer

900 mm Hg

Question 20

How will a model of carbon dioxide gas be different from the model of the solid carbon dioxide shown?

Accepted Answer

The gas particles will be farther apart.

Answer

The gas particles will be larger.

Answer

The gas particles will form bonds.

Answer

The gas particles will react.

Question 21

Which of the following best explains why doubling the temperature of an ideal gas in a closed vessel doubles the pressure?

Accepted Answer

Increasing the temperature causes gas molecules to move more rapidly, striking the vessel walls more frequently and with greater force.

Answer

Increasing the temperature increases the size of the gas molecules, which then can put more pressure on the vessel walls.

Answer

Increasing the temperature decreases the volume, causing molecules to strike the vessel walls more frequently.

Answer

Increasing the temperature causes gas molecules to collide more often and with enough force to displace electrons.

Question 22

A student burned three pieces of Mg, and each weighed 0.50 g. In three separate trials, the mass of MgO was recorded as 0.39 g, 0.38 g, and 0.37 g. Which of the following BEST describes the results?

Accepted Answer

precise

Answer

accurate

Answer

both accurate and precise

Answer

neither accurate nor precise

Question 23

Which formula represents a tetrahedral molecule?

Accepted Answer

CH4

Answer

CaCl2

Answer

HBr

Answer

Br2

Question 24

How many moles are in 199 grams of CCl₄?

Accepted Answer

1.29 moles

Answer

2.00 moles

Answer

0.75 moles

Answer

1.50 moles

Question 25

What is the molarity, rounded to the nearest hundreths, when 2.80 g of Mg(NO₃₎₂ are dissolved in enough water to make 75 mL of solution?

Accepted Answer

0.25 M

Answer

.50 M

Answer

1.0 M

Answer

8.0 M

Question 26

As a distant star moves away from Earth, the light given off by the star has a measurably lower frequency. What happens to the wavelength and energy of the photons of light when the frequency becomes lower?

Accepted Answer

The wavelength becomes longer, and the energy decreases.

Answer

The wavelength becomes shorter, and the energy decreases.

Answer

The wavelength becomes longer, and the energy increases.

Answer

The wavelength becomes shorter, and the energy increases.

Question 27

X-ray crystallography is a technique that allows scientists to determine the ionic and atomic radii of elements. Which of these statements correctly describes a trend in ionic or atomic radii in the periodic table?

Accepted Answer

The atomic radius increases from top to bottom in a group.

Answer

The ionic radius decreases from top to bottom in a group.

Answer

The atomic radius increases from left to right across a period.

Answer

The ionic radius remains constant from right to left across a period.

Question 28

Based on the solubility curve information and the results of the experiment, what is most likely the identity of this unknown solute?

Accepted Answer

KNO3

Answer

NaCl

Answer

KCl

Answer

NaNO3

Question 29

A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature drops rapidly. Which of the following statements is best supported by this observation?

Accepted Answer

An endothermic reaction occurred.

Answer

A dehydration reaction occurred.

Answer

The water was originally warmer than the compound.

Answer

The beaker was contaminated by another compound.

Question 30

onathan is testing the solubility of cerium(III) sulfate in water under different conditions. The water solubility curve of cerium(III) sulfate is shown below.

Jonathan will observe the rate of dissolution of 3.0-gram solid samples of the compound under the eight different sets of conditions described in the table below.

Accepted Answer

0001

Answer

0004

Answer

0005

Answer

0007

Question 31

The light and dark circles in the pictures below represent different types of atoms. Which picture BEST represents a pure compound?

Accepted Answer

Question 32

Calcium ions plan an important role in the function of neurons in the brain. Elements that are chemically (react) similar to calcium can interfere with the function of neurons. Which of the following is most likely to imitate calcium's role in the function of neurons?

Accepted Answer

Strontium

Answer

Sodium

Answer

Potassium

Answer

Rubidium

Question 33

A physical property may be investigated by

Accepted Answer

melting ice.

Answer

letting milk turn sour.

Answer

allowing silver to tarnish.

Answer

burning wood.

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