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

investigations:

Answer 2

activity aimed at finding information

Question 3

observations:

Answer 3

information obtained by the use of our senses or measuring instruments

Question 4

scientists:

Answer 4

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

Question 5

elements:

Answer 5

pure substance made up of only one type of atom

Question 6

periodic table:

Answer 6

a table listing all known elements. The elements are grouped according to their properties and in order of the number of protons in their nucleus.

Question 7

group:

Answer 7

in the periodic table of elements, a single vertical column of elements whith a similar nature

Question 8

inert:

Answer 8

not reactive

Question 9

noble gas:

Answer 9

elements in the last column of the periodic table. They are extremely inert gases.