STEM 11 1.How many moles of carbon dioxide does 250 grams of the substance have? How many molecules of CO2 are there?
2. Determine the percent composition of each element in the compound in tartaric acid (C4H6O6)
3. What are the empirical and molecular formula of a compound that is 40.27% potassium, 26.78%
chromium, and 32.95% oxygen?
4. Balance the following equations
1. _ C + _ O2 → ___ CO
2. _ Mg + _ O2 → _ MgO
3. _ H2O2 → _ H2O + _ O2
4. _ CH4 + O2 → _ CO2 + _ H2O
5. _ N2O5 → _ N2O4 + _ O2

the dependant variable is spilled water

the independent is the heat

the answer to this question is 3.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.