What is a mole?

What is Avogadro's number?

Calculate the molar mass for each of the following:

b. C₃H₆O₃

Calculate the molar mass for each of the following:

c. Fe(ClO₄)₃

Calculate the molar mass for each of the following:

a. Al₂(SO₄)₃, antiperspirant

Calculate the mass, in grams, for each of the following:

d. 0.145 mole of C₂H₆O

Calculate the mass, in grams, for each of the following:

e. 2.08 moles of (NH₄)₂SO₄

Determine whether each of the following chemical equations is balanced or not balanced:

d.

Balance each of the following chemical equations:

c. Sb₂S₃(s) + HCl(aq) → SbCl₃(aq) + H₂S(g)

Balance each of the following chemical equations:

d. Al(s) + HCl(aq) → H₂(g) + AlCl₃(aq)

Identify each of the following as an oxidation or a reduction:

c. Cr³⁺(aq) + 3e^– → Cr(s)

In the mitochondria of human cells, energy is provided by the oxidation and reduction reactions of the iron ions in the cytochromes in electron transport. Identify each of the following as an oxidation or a reduction:

a. Fe³⁺ + e^– → Fe²⁺

The chemical reaction of hydrogen with oxygen produces water.

2 H₂(g) + O₂(g) → 2 H₂O(g)

c. How many moles of H₂O form when 2.5 moles of O₂ reacts?

Why do chemical reactions require energy of activation?

Draw an energy diagram for an exothermic reaction.

What is measured by the heat of reaction?

Classify each of the following as exothermic or endothermic:

b. The energy level of the products is higher than that of the reactants.

Classify each of the following as exothermic or endothermic:

c. The metabolism of glucose in the body provides energy.

Classify each of the following as exothermic or endothermic:

b. In the body, the synthesis of proteins requires energy.

Classify each of the following as exothermic or endothermic:

a. CH₄(g) + 2O₂(g) $\xrightarrow{∆}$ CO₂(g) + 2H₂O(g) + 802kJ

What is meant by the rate of a reaction?

How would each of the following change the rate of the reaction shown here?

2 SO₂(g) + O₂(g) → 2 SO₃(g)

a. adding some SO₂(g)

How would each of the following change the rate of the reaction shown here?

2 NO(g) + 2 H₂(g) → N₂(g) + 2 H₂O(g)

c. removing some H₂(g)

Using the models of the molecules (black = C, white = H, yellow = S, green = Cl), determine each of the following for models of compounds 1 and 2:

d. number of moles in 10.0 g

Using the models of the molecules (black = C, white = H, yellow = S, red = O), determine each of the following for models of compounds 1 and 2:

c. number of moles in 10.0 g

Ibuprofen, an anti-inflammatory drug in Advil, has the formula C₁₃H₁₈O₂.

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d. How many moles of ibuprofen contain 1.22 × 10²³ atoms of C?

Balance each of the following by adding coefficients, and identify the type of reaction for each:

a.

Balance each of the following by adding coefficients, and identify the type of reaction for each:

b.

If red spheres represent oxygen atoms, blue spheres represent nitrogen atoms, and all the molecules are gases,

a. write the formula for each of the reactants and products.

If red spheres represent oxygen atoms, blue spheres represent nitrogen atoms, and all the molecules are gases,

b. write a balanced equation for the reaction.