Heating and cooling can cause matter to change state. Which of the following occurs when heat is added to a system? A gas becomes a liquid.

A liquid becomes a solid.

A gas becomes a solid.

A liquid becomes a gas.

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

Need in all of themmm only answer if you know plsssss

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.