a candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed in side the jar, why?

You run a 5k for charity. How many feet do you run?

State one qualitative and one quantitative statement of the following : water, sodium hydroxide, air, gold, mercury, carbon, iron and hydrogen gas

What would happen if Phosphorus disappeared?

How many calories are given off by 85 g of water that cools from 90 c to 67 c?

Which of the following contribute to acid rain

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.

Under what condition is decompostion the fastest? Under what condition is it the slowest?