JOIN IN LESSON 2

Question 1

What form of energy is the primary result that is produced by a fuel cell?
* Chemical energy released as heat
* Chemical energy released as electricity
* Physical energy released as heat

Answer 1

Chemical energy released as electricity

Question 2

Write a balanced chemical equation describing the reaction between
propane, C3H8, and oxygen, O2, to form carbon dioxide and water

Answer 2

C 3 H 8 ( g ) Propane + 5 O 2 ( g ) Oxygen → 3 CO 2 ( g ) Carbon dioxide + 4 H 2 O ( l ) Water

Question 3

Which law is reflected by the balanced chemical equation?
* Conservation of energy
* Conservation of matter
* Conservation of charge

Answer 3

Conservation of matter

Question 4

When this equation is balanced with the smallest whole number coefficients, what is the coefficient of oxygen?
C3H7OH + O2 → CO2 + H20
* 4
* 5
* 6
* 9

Answer 4

9

Question 5

For most concentrated solutions, which is present in greater amounts?
* Solute
* Solvent
* Both are roughly equal

Answer 5

Solute

Question 6

How many grams of solute are present in 3.21 L of 0.037 M KNO3?
* 0.119 g
* 5.23 g
* 12.0 g

Answer 6

12.0 g

Question 7

When HCl reacts with ammonia, what is/are the spectator ion or ions?
*H+
*Cl-
*NH4+
* There are no spectator ions

Answer 7

Cl-

Question 8

What is left out when a net ionic equation is written?
* The physical states of the chemicals
* Any precipitate that forms
* Spectator ions
* Any gases or precipitates that form

Answer 8

Spectator ions

Question 9

What other property is true about a strong acid?
* Concentrated solution
* Strong electrolyte
* Strong salt

Answer 9

Strong electrolyte

Question 10

What are the products of a neutralization reaction?
* Water
* Salt
* Both water and salt
* Water and a precipitate

Answer 10

Both water and salt

Question 11

When aqueous solutions of acetic acid and potassium hydroxide are
combined, a neutralization reaction will occur
* Write the following equations:
* Molecular
* Total ionic
* Net ionic

Question 12

When aqueous sodium carbonate and barium chloride are combined, the
solution becomes cloudy white with solid barium carbonate
* Write the following equations:
* Molecular
* Total ionic
* Net ionic

Question 13

Which compound has the largest molar mass?
* Sodium nitrate
* Potassium hydroxide
* Sodium carbonate

Answer 13

Sodium carbonate

Question 14

Determine the molar mass of each of the following compounds, all of which
are used as fertilizers for the production of biomass:
* Calcium sulfate, CaSO4
* Urea, CO(NH2)2
* Carnallite, H12Cl3KMgO6