chem-1-revision2

Molar concentration (molarity) is defined as:

The number of moles of solute per gram of solvent.

The number of grams of solute per liter of solution.

The number of moles of solute per liter of solution.

The volume of solute in a given solution.

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Which of the following statements is false?

The law of conservation of mass states that the total mass of reactants must equal the total mass of products.

Stoichiometry is the study of the mass relationships in chemical reactions.

The molar mass of an element is the same as its atomic mass but expressed in g/mol.

The molarity of a solution is defined as the number of moles of solute per gram of solvent.

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Which of the following statements are true?

The mole is defined as the amount of substance that contains 6.022 × 10²³ entities.

The stoichiometric ratio in a reaction determines how much reactants is formed.

A balanced chemical equation must have equal numbers of molecules on both sides.

Molar mass is measured in g/L.

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If a reaction occurs in a non-stoichiometric ratio, what happens?

One reactant is entirely consumed while another remains.

The reaction does not proceed.

A limiting reagent determines the amount of product.

The product formed is unpredictable.

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The unit commonly used for concentration in the lecture is:

mol/kg.

M (molarity).

mol/L.

g/mol.

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If a reaction follows the ratio 2A + 3B → C, what does this mean?

Two molecules of A react with three molecules of B to produce C.

Two moles of A react with three moles of B to produce one mole of C.

The reaction occurs in equal proportions.

A and B react in a 3:2 ratio by mass.

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What does a balanced chemical equation indicate?

The physical states of the reactants and products.

The ratio of moles of reactants and products.

The number of molecules involved in the reaction.

The rate at which the reaction occurs.

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Which of the following statements are false?

Avogadro’s number is 6.022 × 10²³ representing the number of atoms in 1 gram of carbon 12.

The mole is a conversion factor to relate mass and number of particles

The limiting reagent is the reactant that determines the maximum amount of product formed.

Molar mass values are obtained from periodic table data.

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The correct unit for molar mass is:

g/mol.

mol/g.

g/mL.

mol/L.

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10.

What is the purpose of balancing chemical equations?

To indicate the type of chemical bonds involved.

To ensure that molecules are equal on both sides.

To determine the speed of the reaction.

To satisfy the law of conservation of mass.

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