Chem Quiz 2 Ca

Endothermic

+ Triangle H

exothermic

- triangle H

A 7.83 g sample of NaCl is dissolved in 90.00ml of ethyl alcohol solution

1.49M

Which of the following reaction is endothermic?

2nd option

Which of the following represents and exothermic reaction?

2nd option

How many g of water are required to be mixed with 11.75 g of HgCl in order to make a 0.01 m solution? (Refer to the periodic table for atomic weights.)

5,000g

Question 20

859 g/min

The curves represent two possible reaction paths for the decomposition of ammonia, NH3. One can correctly conclude from the graph that the heat of the reaction corresponds to the interval labeled:

A

Which of the following statements is FALSE concerning these factors?

A reaction occurs each time particles of the reactants collides

Catalyst

A substance that changes the rate of the reaction, and is not consumed in the reaction

1st graph

B

3rd graph

B

The curves represent two possible paths for the decomposition of ammonia, NH3. One can correctly conclude from the graph that the smallest activation energy shown for the decomposition of NH3 corresponds to the interval labeled:

B

One can correctly conclude from the graph that the largest activation energy shown for the decomposition of NH3 corresponds to the interval labeled:

E

Graph 4?

E2>E1 and Hrxn is positive

Increased temperature generally decreases the rate of a reaction:

False

The action of a catalyst can be explained in the following manner:

The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower space

Increased concentration generally increases the reaction rate:

True

The formation of a solid when two liquids are mixed indicates a reaction:

True

You many normally expect a slow reaction rate if a large A.E. is required:

True

One can correctly conclude from the graph that the best explanation for the difference between (I) and (II) is that:

a catalyst was added

solution

a uniform mixture of molecules or ions of one substance in another

molecular formation at the time of a reaction

activation complex

Raising the temperature of a reacting system increases the rate of the reaction, but does NOT increase the:

activation energy

affects the activation energy level

catalyst

2nd graph

endothermic

way to detect reactions

precipitation

solvent

that component of a solution which dissolves the solute

solute

the substance dissolved in a solution

Rate is related to:

time