Chemistry Practice Test

Correct answer: C

The correct answer is An attraction between oppositely charged ions formed after electron transfer.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Ionic bonding follows electron transfer that produces positive and negative ions with electrostatic attraction.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: D

The correct answer is A bond in which atoms share one or more pairs of electrons.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Covalent bonds result from shared electron pairs between atoms.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: A

The correct answer is Its bonds and shape create an uneven distribution of charge.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Bond polarity and molecular geometry together determine whether charge is distributed unevenly.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: B

The correct answer is Oppositely charged ions arrange in a repeating structure that maximizes attraction and reduces repulsion.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Ionic solids organize many ions in a repeating pattern governed by electrostatic forces.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: C

The correct answer is Graphite has mobile electrons within layers, while diamond holds electrons in strong bonds.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Different carbon arrangements produce different bonding and electron mobility.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: D

The correct answer is Valence electrons and how they are arranged in bonds and lone pairs.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Lewis structures provide a model for valence electrons, bonding pairs, and nonbonding pairs.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: A

The correct answer is More energy is needed to separate its particles into a gas.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Boiling involves separating particles, so stronger attractions generally require more thermal energy.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: B

The correct answer is The three-dimensional arrangement of atoms around a central atom.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Electron-pair repulsion and bonding arrangement help determine a molecule’s three-dimensional shape.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: C

The correct answer is Its ions are separated and free to move through the solution.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Mobile charged particles allow an aqueous solution to carry electric current.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.

Correct answer: D

The correct answer is A reaction produces a substance with new properties and a composition different from the reactants.

1. Identify the chemistry concept: Determine whether the prompt concerns atomic structure, bonding, reactions, energy, rates, equilibrium, acids and bases, or laboratory reasoning.
2. Use the evidence: Chemical change reorganizes atoms into substances with different properties; evidence must be interpreted with context.
3. Check the model: Confirm that the answer conserves matter and charge and matches the data or chemical relationship described in the question.