under what conditions do most gases behave ideally?
a. at all temperatures and pressures
b. at high temperatures and pressure above 10 atm
c. at extremely low temperature and low pressure
d. at low temperature and high pressure
e. at high temperature and low pressure

Answer : The correct option is, (e) at high temperature and low pressure

Explanation :

The conditions for ideal gas are :

Ideal gas are those gas that has no intermolecular attractions.

Ideal gas are those gas that have negligible volume.

The ideal gas equation is,

The conditions for real gas are :

Real gas are those gas that have intermolecular attractions.

Real gas are those gas that have volume.

The real gas equation is,

A real gas behave ideally at high temperature and low pressure condition.  Or we can say that most of the gases behave ideally at high temperature and low pressure condition.

Hence, at high temperature and low pressure the most of the gases behave as an ideal gas.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e