Question

The enthalpy of a substance

by increasing the
a) increases,temperature
decreases,mass
b) decreases,temperature
is not altered,mass

Reaction: N2(g)+202(g)→2NO2(g):ΔH=+66.4kJ
A)occurs slowly
C)is endothermic
B)is exothermic
D)is in equilibrium

the second one is a fill in the blanks.

sorry it is the first one thats is fill in the blanks

Answer 1

1. See below.

2. B:Exothermic

Step-by-step explanation:

First Question

The question, as written, is difficult to understand. The following statements are true, so please draw an answer from:

• The enthalpy of a substance will increase if energy is absorbed. This would lead to a temperature decrease of the system.
• There is no change in mass in a chemical reaction.

Second Question

The given reaction indicates that heat is released (+66.4kJ). This means it is an exothermic reaction. An endothermic reaction will remove energy (heat) from the system, and would have a negative sign. There is no information on the rate of reaction, nor on its equilibrium status. The answer is B:Exothermic