question Which analytical method is commonly used for the detection and quantification of trace metals in environmental samples

What is the term for a bond formed by the attraction between the positive end of one molecule and the negative end of another molecule?

A. Hydrogen bond
B. London dispersion
C. Metallic
D. Ionic

What is the equation for calculating the heat of reaction (ΔHrxn) using bond energies?

A. ΔHrxn = Σ (bond energies broken) - Σ (bond energies formed)
B. ΔHrxn = Σ (bond energies formed) - Σ (bond energies broken)
C. ΔHrxn = Σ (bond energies broken) * Σ (bond energies formed)
D. ΔHrxn = Σ (bond energies broken) / Σ (bond energies formed)

The Lewis structure for a nitrogen trifluoride (NF3) molecule shows:

A. One single bond and two double bonds
B. One single bond and two triple bonds
C. Three single bonds
D. One double bond and two single bonds

The balanced chemical equation for the reaction between sulfuric acid (H₂SO₄) and potassium carbonate (K₂CO₃) is:

A. H₂SO₄ + K₂CO₃ → K₂SO₄ + H₂O + CO₂
B. H₂SO₄ + K₂CO₃ → K₂SO₄ + CO₂ + H₂O
C. H₂SO₄ + K₂CO₃ → K₂SO₄ + 2H₂O + CO₂
D. 2H₂SO₄ + K₂CO₃ → 2K₂SO₄ + 2H₂O + 2CO₂

The standard entropy of a substance is defined at:

A. 1 atm pressure and 0 K
B. 1 atm pressure and 25°C
C. 0 atm pressure and 0 K
D. 0 atm pressure and 100°C

The process of a gas changing directly from a gas to a liquid is known as:

A. Condensation
B. Evaporation
C. Sublimation
D. Deposition

The chemical formula for sulfuric acid is:

A. H₂SO₄
B. HCl
C. HNO₃
D. H₂O

In thermodynamics, "work" is considered positive when:

A. The system does work on the surroundings
B. The surroundings do work on the system
C. No work is done
D. The work is reversible

The bond angle in a molecule with a square planar shape is approximately:

A. 90°
B. 120°
C. 180°
D. 90°

In atomic absorption spectroscopy, the amount of absorbed light is proportional to the:

A. Concentration of the analyte
B. Density of the sample
C. Temperature of the solution
D. pH of the solution

Chemistry MCQS - QUESTION DETAILS

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