Which of the following statements about stars is true?

All stars are the same age.

Stars vary greatly in age.

none of these

Stars rarely differ in age.

What happens when you put baking soda on an acid

Classify the following materials as solid liquid or gas at room temperature milk helium granite oxygen steel of matter

Magnesium is a light metal with a density of 1.74 g/cm3. What volume is occupied by 1.35 kg of magnesium?

Extracting oil from shale deposits a has been initiated on a large scale in the United States and will soon surpass Canada's production. b involves removing and refining waxy hydrocarbons called kerogen.

What is the first step when measuring out acid

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.