1.The formula for acetic acid is CH3COOH. Carmen pours 0.12 moles of acetic acid

Question

1.The formula for acetic acid is CH3COOH. Carmen pours 0.12 moles of acetic acid into an empty beaker. How many acetic acid molecules are in the beaker?

Answers

2.0 x 1023 molecules

0.12 molecules

60 molecules

7.2 x 1022 molecules

5.0 x 1024 molecules

2.The formula for acetic acid is CH3COOH. Carolyn wants to know how many oxygen atoms are in 0.12 moles of acetic acid.

Answers

4.0 x 10-24 atoms

60 atoms

7.2 x 1022 atoms

1 x 1025 atoms

1.4 x 1023 atoms

3,True or false: The chemical reaction CH4(g) + 2O2(g) ->(triangle for heat above arrow)CO2(g) + 2H2O is an endothermic reaction.

4.Use the equation shown below to answer the following question. Angela has 2 moles of CaCl2 and 4 moles of AgNO3. How many moles of AgCl can she make?

CaCl2 + 2AgNO3 <-> Ca(NO3)2 + 2AgCl

5. Use that equation again (The equation shown below) to answer the following question. Gina has 30.0 grams of CaCl2 and 208 grams of AgNO3. How many grams of AgCl can she make?

CaCl2 + 2AgNO3 <-> Ca(NO3)2 + 2AgCl

6.Chris dissolves 20. grams of NaCl with water to make a 100. mL solution. What is the molarity of the solution? There are 1,000 mL in 1 L.

7.You are performing a chemical reaction in a test tube. The test tube gets colder as the reaction takes place. This chemical reaction is...

Answers

exothermic

endothermic

a decomposition reaction.

a single replacement reaction

a double replacement reaction

8. You are examining several different solutions to see which ones contain high concentrations of electrolytes. You examine electrolyte concentration using a light bulb that is similar to the one discussed in Chapter 7. The table below describes the liquids that you tested and the behavior of the light bulb when placed in different liquids.

Beaker # Description of Liquid or Mixture Light Bulb Behavior

1 1 liter of pure H2O Light Off

2 1 liter of 0.5M Ba(OH)2(aq) Light On

3 1 liter of 0.5M H2SO4(aq) Light On

4 1 liter of 0.5M Ba(OH)2 + 1 liter of 0.5M H2SO4 ???

What is the most reasonable prediction as to how the light bulb will behave in Beaker # 4? The following chemical reaction should help you make your prediction.

Ba(OH)2(aq) + H2SO4(aq) => BaSO4(s) + 2H2O(l)

Answers

The lightbulb will be similar to the one shown in Beaker # 1 (no light).

The lightbulb will be similar to the ones shown in Beakers # 2 and 3 (light bulb will light up).

The lightbulb will be brighter than the ones shown in Beakers # 2 and 3 (light bulb will light very brightly)

The lightbulb will light up, but it will be more dim than the light bulbs shown in Beakers # 2 and 3 (light bulb will light dimly).

9.

The pH in your can of soda is 3.5. What is the concentration of acid (H3O+) in your can of soda?

Answers

3.2 x 10-4 M

3.5 M

0.54 M

-0.54 M

3200 M

Explanation / Answer

1.       7.2*1022

2.       1.4*1023

3.       false

4.       4moles

5.       77.57 g

6.       3.42 M

7.       endothermic

8.       The lightbulb will be similar to the one shown in Beaker # 1 (no light). as BaSO4 will precipitate giving pure H2O.

9.       3.2*10^-4M

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