Elements and Compounds

Match it! Select the correct answer from the pull down...Good luck!

What instrument is used to measure mass?

Char t of all elements known to exist

Measurement of the amount of matter in an object

What is the ratio of atoms in the chemical formula: HO4

Measurement of the amount of GRAVITATIONAL FORCE on an object

True or False A compound is NOT a pure substance.

I am the 3rd most abundant gas in the air. If you run electricity through me I turn purple. Who am I?

If a model of air contains 7 oxygen molecules, how many nitrogen molecules should it have?