Question

name: surname: elements, compounds, and mixtures (worksheet) q.1. write t or true if the statement is true; write f or false if the statement is false. 1. all pure substances are elements. 2. atom is the smallest unit of an element. 3. homogeneous mixtures are also called solutions. 4. mixtures cannot be broken down into anything simpler by physical methods. q.2. fill in the blanks with suitable words. a) is a pure substance containing only one kind of atom. b) is a pure substance containing two or more kinds of atoms. c) is a substance made up two or more different substances physically combined. d) a throughout the mixture is a mixture in which the composition is not uniform e) a throughout the mixture is a mixture in which the composition is uniform

Explanation:

1. All pure substances are elements. False, as pure substances can also be compounds. Compounds are made up of two or more different kinds of atoms chemically combined, while elements consist of only one - kind of atom.
2. Atom is the smallest unit of an element. True, atoms are the basic building blocks of elements.
3. Homogeneous mixtures are also called solutions. True, homogeneous mixtures have a uniform composition throughout and are often referred to as solutions.
4. Mixtures cannot be broken down into anything simpler by physical methods. False, mixtures can be separated into their components by physical methods such as filtration, evaporation etc.

For Q2:
a) A pure substance containing only one kind of atom is an element.
b) A pure substance containing two or more kinds of atoms is a compound.
c) A substance made up of two or more different substances physically combined is a mixture.
d) A mixture in which the composition is not uniform throughout is a heterogeneous mixture.
e) A mixture in which the composition is uniform throughout is a homogeneous mixture.

Answer:

Q1:

1. F
2. T
3. T
4. F

Q2:
a) element
b) compound
c) mixture
d) heterogeneous mixture
e) homogeneous mixture