elements compounds and mixtures

Question 1

define pure substance

Answer 1

a homogeneous substance which contains particles only of one kind and has a definite set of properties is called a pure substance

Question 2

define compound

Answer 2

a compound is a pure substance which is composed of two or more elements combined chemically in a fixed proportion by weight and can be broken into smaller parts or elements by chemical methods.

Question 3

define mixture

Answer 3

two or more substances mixed together in any proportion, do not undergo any chemical change, retain their properties the resulting mass is called a mixture

Question 4

define heterogeneous mixtures

Answer 4

not mixed uniformly

Question 5

homogeneous mixtures

Answer 5

combined uniformly