get chemistry blackboard answers

1)     Sodium metal reacts with chlorine gas in a combination reaction. Write a balanced equation to describe this reaction. Click in the answer box to open the symbol palette. Include states of matter in your answer.

2)     Write a balanced equation that corresponds to the following word equation for a reaction in aqueous solution. Include states of matter in your answer.

barium chloride + sulfuric acid → barium sulfate + hydrochloric acid

3)     Consider the following molecular-level diagrams of chemical reactions.

Identify each as decomposition, combination, single-displacement, or double-displacement.

Click in the answer box to activate the palette.

4)     Some campers and military personnel carry MREs (Meals, Ready to Eat) so they can prepare a hot meal when a fire cannot be used. The MREs contain a flameless heater in which the heat given off by a chemical reaction is used to cook the food. The chemical reaction that produces the heat is a single-displacement reaction between magnesium and water. Write a balanced chemical equation for this reaction. (Include states of matter.)

5)     Aqueous calcium chloride reacts with aqueous silver nitrate to form a precipitate of silver chloride and a solution of calcium nitrate. Write a net ionic equation for this reaction. Include physical state symbols. Click in the answer box to open the symbol palette.

Be sure to answer all parts.

6)     A solution contains AgNO3 and Ba(NO3)2. What substance could be added to the solution to precipitate Ag+ ions, but leave Ba2+ ions in solution?

              Na2SO4

              NaCl

              NaNO3

7)     After removal of the Ag+ compound, what could then be added to the solution to precipitate the Ba2+ ions?

              NaCl

              NaNO3

              Na2SO4

Be sure to answer all parts.

8) Add the physical state for each substance in the following aqueous reactions. Then write and balance a net ionic equation for each reaction.

(a)Cr₂(SO₄)₃ + KOH → Cr(OH)₃ + K₂SO₄ (aq)

(b) K₂CrO₄ + PbCl₂ → KCl + PbCrO₄

(c) Na₂SO₃ + H₂SO₄→ Na₂SO₄ +H₂O+ SO₂

9)     Write a balanced equation for the single-displacement reaction of Al(s) with CuSO4(aq). Include states of matter in your answer. Click in the answer box to open the symbol palette.

Be sure to answer all parts.

10)When a piece of copper is placed in a solution of AgNO3, a single-displacement reaction occurs in which silver metal and copper(II) nitrate form. What happens to the charges on the species involved in this chemical reaction?

Copper is converted from a charge of

0 to 2+

Silver is converted from a charge of

1+ to 0

.

11)  Balance each of the following skeletal equations.

(a) 1Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)

(b) 1PCl3(l) + 3AgF(s) → 1PF3(g) + 3AgCl(s)

(c) 2NO2(g) → 2NO(g) + 1O2(g)

12)  Which of the following substances is an electrolyte? (Select all that apply.)

              C12H22O11(aq) (sucrose solution)

              HCl(aq)

              NaOH(aq)

12)  Classify the reaction below as decomposition, combination, single-displacement, double-displacement, combustion, or none of these.

2 NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g)

              double-displacement

              combustion

              none of these

              single-displacement

              decomposition

              combination

13)  Distinguish between an electrolyte and a nonelectrolyte (check all that apply).

              An electrolyte lights-up in an electrical current.

              An electrolyte produces electricity.

              An electrolyte produces ions when dissolved in water.

              A nonelectrolyte does not produce ions when dissolved in water.

Select all that apply.

14)  Describe what you would expect to observe, if anything, when a piece of nickel is placed in a solution of copper(II) nitrate.

              Solid copper would form on the surface of the nickel metal.

              The blue color of the solution would become darker.

              Nickel atoms are converted to nickel ions in solution.

              The blue color of the solution would become lighter.

              No reaction would occur.

15)  Which of the following substances is an electrolyte. Select all that apply.

              CH3CH2OH(aq)

              H2O(l)

              NaCl(aq)

16)  Begin by writing formulas for the reactants and products, including physical states. When necessary use coefficients to balance the equation. Click in the answer box to open the symbol palette.

  (a) When solid sodium hydride, NaH, is added to water, hydrogen gas is released and

   aqueous sodium hydroxide forms.

  (b) Aluminum metal reacts with chlorine gas to form solid aluminum chloride.

17) Zinc metal reacts with a solution of tin(II) chloride in a single-displacement reaction.

Write a balanced equation to describe this reaction. Include states of matter in your answer. Click in the answer box to open the symbol palette.

18)  Write the formula for the product of the combustion reaction of Al with molecular oxygen. Include the state of matter. Click in the answer box to open the symbol palette.

19) Which of the following ionic compounds would be expected to be soluble in water?

          CuCl2

          Cu(OH)2

          AgNO3

          PbCl2

20) Xenon gas reacts with fluorine gas to form xenon tetrafluoride gas.

Identify which image represents reactants and then which image represents products.

Reactants:A

 Products:

C05010011

Be sure to answer all parts.

21) Complete and balance each of the following single-displacement reactions. Include physical states.

(a)       2Al(s) + 3CuSO4(aq)   →       

(b)       2Cs(s) + 2H2O(l)         →       

22) Aqueous solutions of mercury(I) nitrate, Hg2(NO3)2, and calcium iodide are mixed and a yellow solid forms. Identify the solid. Note that the mercury(I) ion exists as Hg22+. Include the state of matter in your answer. Click in the answer box to open the symbol palette.

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