What are some ideas for a compound machine for my middle school invention science project that can be useful in people's daily lives? I need a explanation of why it's important.

A sample of gas occupies a volume of 73.7 mL. As it expands, it does 133.7 J of work on its surroundings at a constant pressure of 783 torr.

A 7.100 L sample of gas is cooled from 73.0 °C to a temperature at which its volume is 5.700 L. What is this new temperature? Assume no change in pressure of the gas.

you are planning an experiment to find whether the rate at which water freezes depends on the shape of its container. identify the manipulate variable in the responding variable. list the other variables you would control.

Many gyms and health clubs have steam saunas, which are small steam-filled rooms. Traditionally, steam saunas have a container of heated rocks. A small ladle of water is poured on the rocks in order to make the steam.

N a neutral calcium atom, there are 20 protons, 20 neutrons, and 20 electrons. If a calcium atom loses 2 electrons, what would be the calcium's atom's charge?

The compound KOH is called

A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?

If 100 mL of a gas were enclosed in a buret at 500 mm Hg, what volume would the gas occupy at 1000 mm Hg at the same temperature? P1V1=P2V2

Would Mn (HPO4) 2 be manganese (II) monohydrogen phosphate?

The fundamental frequency of a violin string is 440 hz. the frequency of its second harmonic is