2023 RS Chemistry Spring Final Review

By doing which action will you decrease the number of collisions and energy of reactant molecules?

• increasing the pressure of the reactant mixture

• decreasing the temperature of the reactant mixture

• adding a catalyst

A student increases the temperature of a 556 cm³ balloon from 278 K to 308 K.  The volume will decrease.

Use V1/T1 = V2/T2

• True

• False

• I have absolutely no idea

Which equation is a correctly written thermochemical equation?

• NH₄Cl→NH₄ ⁺ + Cl⁻

• C₅H₁₂(g) + 8O₂ (g)→5CO₂ (g) + 6H2O (l), ΔH = −3,536.1 kJ/mol

• 2C₈H₁₈  + 25O₂ →16CO₂ + 18H₂O, ΔH = −5,471 kJ/mol

Which statement is true about a carbonated soft drink?

• The water is the solution, and carbon dioxide is the solvent.

• The water is the solvent, and the carbon dioxide is the solute.

• The water is the solution, and carbon dioxide is the solvent.

A solution has a hydrogen ion (or hydronium ion) concentration of 3.16×10⁻⁹M.

What is the pH of the solution?

pH = -log [H+]

• -8.0

• 8.0

• 8.5

Which example is an exothermic reaction?

• melting ice

• dissolving isugar in water

• condensing steam

If you have 10 grams of a substance that decays with a half-life of 14 days, then how much will you have after 70 days?

• 1.25 g

• 0.313 g

• 0.10 g

If a solution is defined as a weak base, its pH is which of the following?

• closer to 7

• at 7 exactly

• farther away from 7

What would be the number of moles of you have 432 g of Manganese?

• 72.5 Mol

• 7.6 Mol

• 0.13 Mol