A sample of CO2 (s) and a sample of CO2 (g) differ in their

1) chemical compositions

2) empirical formulas

3) molecular structures

4) physical properties

What is covalent bonding

What happens to the female sex cell that has left the ovary if it isn't fertilised

This is balanced right? 2 C2H2 + 5 O2 → 4 CO2 + 2 H2O Im pretty sure im correct.

7. I'm full of holes, yet flexible and thin. I control what gets out as well as what comes in ...

Why are all of the substances on the periodic table classified as elements? A. Substances on the periodic table cannot be dissolved in water or other liquids. B. All elements are pure substances. C.

How can a neutral atom become a positively-charged particle?

The last column of the periodic table contains the noble gases, elements that do not easily form chemical bonds.

When pollution is removed from the air by a natural process, it

What atomic property is different in each isotope of an element?

How do carbon-12 and carbon-13 differ? Select all that apply. They have different amounts of neutrons. They have different atomic charges. They have different mass numbers. They have different amounts of electrons.