Regents Chem Round 5

Which numerical setup can be used to calculate the heat energy required to completely melt 100. grams of H₂O(s) at 0°C?

• (100. g)(334 J/g)

• (100. g)(2260 J/g)

• (100. g)(4.18 J/g•K)(0°C)

• (100. g)(4.18 J/g•K)(273 K)

During which phase change does the entropy of a sample of H₂O increase?

• H2O(g) → H2O(ℓ)

• H2O(g) → H2O(s)

• H2O(ℓ) → H2O(g)

• H2O(ℓ) → H2O(s)

Given the formula for a compound:

What is a chemical name for this compound?

• 1-butanamide

• 4-butanamide

• 1-butanamine

• 4-butanamine

Given the equation for a reaction:

C₄H₁₀ + Cl₂ → C₄H₉Cl + HCl

Which type of reaction is represented by the equation?

• addition

• substitution

• fermentation

• polymerization

Which half-reaction equation represents reduction?

• Cu → Cu²⁺ + 2e^-

• Cu²⁺ + 2e^- → Cu

• Ag + e^- → Ag⁺

• Ag⁺ → Ag + e^-

Given the balanced ionic equation representing a reaction:

Zn(s) + Co²⁺(aq) → Zn²⁺(aq) + Co(s)

Which statement describes the electrons involved in this reaction?

• Each Zn atom loses 2 electrons, and each Co²⁺ ion gains 2 electrons.

• Each Zn atom loses 2 electrons, and each Co²⁺ ion loses 2 electrons.

• Each Zn atom gains 2 electrons, and each Co²⁺ ion loses 2 electrons.

• Each Zn atom gains 2 electrons, and each Co²⁺ ion gains 2 electrons.

What are the two oxidation states of nitrogen in NH₄NO₂?

• +2 and +5

• +3 and -5

• -3 and +3

• -3 and -3

The table below shows the molar concentrations of hydronium ion, H₃O⁺, in four different solutions.

Which solution has the highest pH?

• A

• B

• C

• D

Given the equation:

Which type of nuclear reaction is represented by the equation?

• fission

• fusion

• beta decay

• alpha decay

Which nuclear emission has the least penetrating power and the greatest ionizing ability?

• alpha particle

• beta particle

• gamma ray

• positron