definitions

Question 1

definition of element

Answer 1

a susbstance that cannot be split into anything simpler by chemical means

Question 2

atom definition

Answer 2

the smallest part of an element that can take part in a chemical reaction

Question 3

molecule definition

Answer 3

the smallest particle of a compound

Question 4

compound definition

Answer 4

pure substance that contains different elememts combined in fixed proportions eg. water

Question 5

mixture definition

Answer 5

made up of at least 2 chemical substances in the form of solutions or colloids

Question 6

valency definition

Answer 6

a numerical measure of combining power of an atom/ion

Question 7

homogenous definition

Answer 7

have the same composition, no matter where in the mixture you look (solutions)

Question 8

heterogenous definition

Answer 8

have different composition depending on where you look. Eg. wood, sand.

Question 9

gravimetric analysis def.

Answer 9

process of accurately determining the quantity (mass) of each substance present in a sample of a mixture.

Question 10

isotope definition

Answer 10

atoms of the same element that have differing numbers of neutrons while the number of protons stay constant.

Question 11

how can compounds exist?

Answer 11

compounds can exist as molecules (H20) or giant lattices (NaCl)