Chemistry Concentration

How many moles of NaBr are present in 2,000 mL of a 3.5 M solution?

• 7 mol

• 3.5 mol

• 6 mol

• 8.5 mol

How many grams of KCl are dissolved in 2000 g of water if the concentration of the solution is 250 ppm?

• 25 g

• 10 g

• 0.5 g

• 2.5 g

Rate of disappearance of the reactant can be expressed as

• −Δ[R]/Δt

• Δ[R]/Δt

• Δ[P]/Δt

• −Δ[P]/Δt

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NGSS.HS-PS1-5

The ratio of the change in the concentration of the reactants is known as

• instantaneous reaction

• Equilibrium

• average rate of reaction

• none of the above

Tags

NGSS.HS-PS1-5

Rate of appearance of the products can be expressed as

• −Δ[R]/Δt

• Δ[R]/Δt

• Δ[P]/Δt

• −Δ[P]/Δt

Tags

NGSS.HS-PS1-5

Which cation produces a yellow precipitate when reacted against potassium iodide, KI?

• Cu²⁺

• Pb²⁺

• Fe²⁺

• Zn²⁺

Which of the following salts CANNOT be produced using acid-base titration method?

• Sodium chloride

• Copper (II) nitrate

• Ammonium sulphate

• Potassium carbonate

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NGSS.HS-PS1-5

What is the molarity of a solution containing 5 moles of solute in 2 liters of solution?

• 2.5 M

• 5 M

• 10 M

• 0.5 M

If 58.5 grams of NaCl is dissolved in 1 liter of water, what is the molarity of the solution? (Molar mass of NaCl = 58.5 g/mol)

• 1 M

• 0.5 M

• 2 M

• 1.5 M

Which of the following is a unit of concentration?

• Molarity

• Kelvin

• Pascal

• Joule

Tags

NGSS.HS-PS1-5