Determine the oxidation number for the indicated element in each of the following substances: f. Cr in BaCrO4.

Which element is oxidized, and which is reduced in the following reactions? (a) N₂(g) + 3 H₂(g) → 2 NH₃(g)

Which element is oxidized, and which is reduced in the following reactions? (c) Cl₂(aq) + 2 NaI(aq) → I₂(aq) + 2 NaCl(aq) (d) PbS(s) + 4 H₂O₂(aq) → PbSO₄(s) + 4 H₂O(l)

Which of the following are redox reactions? For those that are, indicate which element is oxidized and which is reduced. For those that are not, indicate whether they are precipitation or neutralization reactions. (a) P4(s) + 10 HClO(aq) + 6 H₂O(l) → 4 H₃PO₄(aq) + 10 HCl(aq) (b) Br₂(l) + 2 K(s)→ 2 KBr(s) (c) CH₃CH₂OH(l) + 3 O₂(g) → 3 H₂O(l) + 2 CO₂(g) (d) ZnCl₂(aq) + 2 NaOH(aq) → Zn(OH)₂(s) + 2 NaCl(aq)

Write balanced net ionic equations for the reactions of b. aluminum with formic acid, HCOOH. Hint: These reactions produce a gas.

Write balanced molecular and net ionic equations for the reactions of (b) dilute sulfuric acid with iron Hint: These reactions produce a gas.

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, write NR. (a) Iron metal is added to a solution of copper(II) nitrate (b) zinc metal is added to a solution of magnesium sulfate

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, write NR. (d) hydrogen gas is bubbled through an aqueous solution of nickel(II) chloride

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, write NR. (e) aluminum metal is added to a solution of cobalt(II) sulfate.

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, write NR. (a) Nickel metal is added to a solution of copper(II) nitrate

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, write NR. (d) chromium metal is immersed in an aqueous solution of cobalt(II) chloride

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, write NR. (e) hydrogen gas is bubbled through a solution of silver nitrate.

The metal cadmium tends to form Cd²⁺ ions. The following observations are made: (i) When a strip of zinc metal is placed in CdCl₂(aq), cadmium metal is deposited on the strip. (ii) When a strip of cadmium metal is placed in Ni(NO₃)(aq), nickel metal is deposited on the strip. b. Is cadmium above or below zinc in the activity series?

The following reactions (note that the arrows are pointing only one direction) can be used to prepare an activity series for the halogens:

Br₂(aq) + 2 NaI(aq) → 2 NaBr(aq) + I₂(aq)

Cl₂(aq) + 2 NaBr(aq) → 2 NaCl(aq) + Br₂(aq)

(a) Which elemental halogen would you predict is the most stable, upon mixing with other halides?

(a) Is the number of moles of ions present in a solution an intensive or an extensive property?

b. What is the difference between 0.50 mol HCl and 0.50 M HCl?

You make 1.000 L of an aqueous solution that contains 35.0 g of sucrose (C12H22O11). (b) How many liters of water would you have to add to this solution to reduce the molarity you calculated in part (a) by a factor of two?

(c) How many milliliters of a 6.00 M NaOH solution are needed to provide 0.350 mol of NaOH?

(b) How many moles of KBr are present in 150 mL of a 0.112 M solution?

(c) How many milliliters of 6.1 M HCl solution are needed to obtain 0.150 mol of HCl?

A person suffering from hyponatremia has a sodium ion concentration in the blood of 0.118 M and a total blood volume of 4.6 L. What mass of sodium chloride would need to be added to the blood to bring the sodium ion concentration up to 0.138 M, assuming no change in blood volume?

(a) How many grams of ethanol, CH3CH2OH, should you dissolve in water to make 1.00 L of vodka (which is an aqueous solution that is 6.86 M ethanol)? (b) Using the density of ethanol (0.789 g/mL), calculate the volume of ethanol you need to make 1.00 L of vodka.

(a) Which will have the highest concentration of potassium ions: 0.20 M KCl, 0.15 M K₂CrO₄, or 0.080 M K₃PO₄?

Indicate the concentration of each ion or molecule present in the following solutions: (a) 0.35 M K₃PO₄ (b) 1.3×10⁻² M MgSO₄ (c) 0.0184 M CH₃CH₂OH

Ignoring protolysis reactions, indicate the concentration of each ion or molecule present in the following solutions: (d) a mixture of 45.0 mL of 0.272 M NaCl and 65.0 mL of 0.0247 M (NH₄)₂CO₃. Assume that the volumes are additive.

Indicate the concentration of each ion present in the solution formed by mixing: (a) 42.0 mL of 0.170 M NaOH with 37.6 mL of 0.400 M NaOH.

Indicate the concentration of each ion present in the solution formed by mixing: (b) 44.0 mL of 0.100 M Na₂SO₄ with 25.0 mL of 0.150 M KCl