Which is true about the temperature of a gas?

at a higher temperature, the particles have a higher average kinetic energy.
at a higher temperature, the volume of the gas is smaller.
at a lower temperature, there are more particles in the gas.
at a lower temperature, the particles in the gas move faster.

Explain that newton first law,second law and third law of motion?

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ