Question

pressure is defined as which of the followings?
a mass divided by acceleration.
b force divided by unit area.
c mass times acceleration.
d force times unit area
question 22
an endothermic reaction causes the surroundings to
a become acidic
b warm up
decrease in temperature.
d release co₂.

Explanation:

• For the first question: Pressure is defined as force per unit area. Option A is related to \(F = ma\) (rearranged as \(m=\frac{F}{a}\)), Option C is \(F = ma\), Option D is incorrect as pressure is force divided by area not multiplied.
• For the second question: In an endothermic reaction, heat is absorbed from the surroundings. When heat is absorbed from the surroundings, the temperature of the surroundings decreases. An endothermic reaction has no direct relation to making the surroundings acidic (Option A) or releasing \(CO_2\) (Option D). If a reaction were exothermic, the surroundings would warm up (opposite of Option B).

Answer:

1. B. force divided by unit area.
2. C. decrease in temperature.