1. pH

2. temperature

3. product concentration

None. Work is the product of (force) x (distance). If the force doesn't

persist while moving through a distance, then the product is zero.

The product of 1, 2 and 5 is 10.

The product of 1, 2 and 5 is 10.

The product of 1, 2 and 5 is 10.

The product of 1, 2 and 5 is 10.

I assume you are asking how do you work out the factors of a prime number. A prime number by definition only has itself and 1 as factors.

Work - or energy transferred is the product of force and the distance that the object moves in the direction of the force.