Classify these substances.
1. N2:.
a. solution
b. heterogeneous mixture
c. homogeneous mixture
d. element
e. compound
f. pure substance.
2. O2:.
a. pure substance
b. homogeneous mixture
c. solution
d. heterogeneous mixture
e. element
f. compound
3. N2O:.
a. compound
b. heterogeneous mixture
c. element
d. homogeneous mixture
e. solution
f. pure substance
4. Air (mostly N 2 and O 2 ):_.
a. homogeneous mixture
b. heterogeneous mixture
c. solution
d. pure substance
e. element
f. compound

An element is a pure substance with only one kind of atom that cannot be broken into simpler substances by chemical or physical means. Therefore when you break the nitrogen gas or oxygen gas you will still get the same element.

Compound are pure substance that can be broken into the constituent elements by a chemical means but not physical means. N2O is a compound with two different atoms. And can be broken into it constituent element through chemical means.

Homogeneous mixture are mixture that contain two or more pure substance that appear uniform through out. The mixture is evenly distributed. Example of homogeneous mixture is Air.