The rate constant for a certain reaction is k = 6.30×10−3 s−1 . if the initial reactant concentration was 0.500 m, what will the concentration be after 19.0 minutes? express your answer with the appropriate units.

0.059M

Explanation: time.

t = 19minutes

t = 19 × 60 s

t = 140s

k = n/delta t

(where n is the ratio of change in concentration while delta t is the change in time)

k = n/dt = 6.30×10−3 s−1

6.30×10−3 s−1 = dc/140s

n = 6.30×10−3 s−1 × 140s

n = 882 ×10−3

= 0.882

Concentration of reactant used in forming a product in the reaction after 19 minutes =

n × concentration

0.882 × 0.5 = 0.441M

Reactant concentration

= (0.5 - 0.441)M

= 0.059M

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

double the distance = divide strength by 4