Unit 1 Review I - Atomic Structure and Properties

Unit 1 Review I - Atomic Structure and Properties

12th Grade

15 Qs

quiz-placeholder

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Unit 1 Review I - Atomic Structure and Properties

Unit 1 Review I - Atomic Structure and Properties

Assessment

Quiz

Chemistry

12th Grade

Hard

Created by

Nicole Midani

FREE Resource

15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the definition of a mole in chemistry?

The mass of one particle of a substance in grams

The number of particles in one mole of a substance

The ratio of masses in a compound

The energy required to remove one electron from an atom

Answer explanation

In chemistry, a mole refers to the number of particles in one mole of a substance. It's a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. This option correctly defines a mole in the context of chemistry.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of mass spectroscopy in chemistry?

To determine the percentage of different isotopes in an element

To measure the mass of one mole of a substance

To calculate the average atomic mass of an element

To determine the composition of a mixture

Answer explanation

Mass spectroscopy in chemistry is primarily used to determine the percentage of different isotopes in an element. It does this by measuring the mass-to-charge ratio of ions. The results can be used to find the relative isotopic abundance, atomic and molecular mass, and the structure of a molecule. The other options, while related to mass and chemistry, are not the primary purpose of mass spectroscopy.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the law of definite proportions?

The ratio of masses in a compound must always be the same

The ratio of protons to neutrons in an atom must always be the same

The ratio of electrons to protons in an atom must always be the same

The ratio of valence electrons to core electrons in an atom must always be the same

Answer explanation

The law of definite proportions, also known as Proust's law, states that a chemical compound always contains exactly the same proportion of elements by mass. This means that the ratio of masses in a compound must always be the same, which is the correct answer to the question. The other options, involving ratios of protons, neutrons, and electrons, are not related to this law.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the difference between an empirical formula and a molecular formula?

An empirical formula shows the lowest whole number ratio of atoms in a compound, while a molecular formula shows the actual number of atoms

An empirical formula shows the actual number of atoms in a compound, while a molecular formula shows the lowest whole number ratio

An empirical formula is used for ionic compounds, while a molecular formula is used for covalent compounds

An empirical formula is used for organic compounds, while a molecular formula is used for inorganic compounds

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of elemental analysis in chemistry?

To determine the composition of a mixture

To calculate the percent yield of a reaction

To measure the mass of different elements in a sample

To determine the purity of a substance

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are valence electrons?

Electrons in the outermost energy level of an atom

Electrons in the innermost energy level of an atom

Electrons in the d subshell of an atom

Electrons in the f subshell of an atom

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the electron configuration of Copper?

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

1s²2s²2p⁶3s²3p⁶4s²3d⁹

1s²2s²2p⁶3s²3p⁶4s¹⁰3d⁰

1s²2s²2p⁶3s²3p⁶4s²3d⁸

Answer explanation

The electron configuration of Copper is 1s²2s²2p⁶3s²3p⁶4s²3d⁹. This configuration is unique because Copper is one of the few elements that doesn't follow the Aufbau principle exactly. It has a completely filled 3d orbital (10 electrons) and one less in the 4s orbital, making the correct configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁹.

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