Question

which of the folowing sums is a variable?
1)
$2 {x}^{2} + 5$
2)
$2 \times 2 + y$
3)
$2 {x}^{2} + {y}^{2}$
4)
$2x + y$
​

Answer 1

Key Points

Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.

Kinetic Molecular Theory can be used to explain both Charles’ and Boyle’s Laws.

The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

Key Terms

ideal gas: a hypothetical gas whose molecules exhibit no interaction and undergo elastic collision with each other and the walls of the container

macroscopic properties: properties that can be visualized or measured by the naked eye; examples include pressure, temperature, and volume

Answer 2

Step-by-step explanation:

A person is said to be healthy when his/her physical, mental, emotional, and psychological state is fit and fine. It is not merely an absence of any disease. While a person is said to be disease-free when he is devoid of diseases. Diseases usually refer to physical health only.