Elements Compounds And Mixtures

Question 1

Alchemists

Answer 1

Olden-day chemist who mixed chemicals and tried to change ordinary metals into gold Alchemists also tried to tell the future.

Question 2

Observations

Answer 2

Information obtained by the use of our senses or measuring instruments

Question 3

Scientists

Answer 3

People skilled in or working in the fields of science; scientists use experiments to find out about the material world around them

Question 4

Elements

Answer 4

Pure substance made up of only one type of atom

Question 5

Atoms

Answer 5

A very small particle that makes up all things. Atoms have the same properties as the objects they make up

Question 6

Atomic number

Answer 6

number of protons in the nucleus of an atom. The atomic number determines which element an atom is.

Question 7

Chemical symbol

Answer 7

the standard way that scientists write the names of the elements, using either a capital letter or a capital followed by a lowercase letter. For example, carbon is C and copper is Cu.

Question 8

Compounds

Answer 8

ubstance made up of two or more different types of atoms that have been joined (bonded) together

Question 9

Bond

Answer 9

force that holds particles of matter, such as atoms, together

Question 10

Mixture

Answer 10

a combination of substances in which each keeps its own properties

Question 11

Hydrogen

Answer 11

the element with the smallest atom. By itself, it is a colourless gas and combines with other elements to form a large number of substances, including water. It is the most common element in living things.

Question 12

Molecule

Answer 12

two or more atoms joined (bonded) together, forming a small particle