A17g sample of h2o2 was decomposed to yield 1g of h2 and 16g of o2 an unknown sample containing only h and o was decomposed to yeild 2g of h2 and 16 g of o2. the formula for the unknown sample is:

Explanation:

Our sample yielded 1g of and 16g of , but our unknown sample yielded 2 times as much  for the same amount of .

What does this mean? that the H:O proportion for the unknown sample is twice the H:O proportion for the sample.

What is the  H:O proportion for the sample? As we can see from its formula, it's 1:1, therefore the proportion for the unknown formula must be 2:1.

That means, two H atoms for every O atom. We could write that as: and you should recognize that formula, for it is one of the most common compounds on earth, Water.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.