Semester 2: Chemistry

Question 1

Nucleus

Answer 1

central part of an atom, made up of protons and neutrons; roundish structure inside a cell that acts as the control centre for the cell. Plural = nuclei.

Question 2

Protons

Answer 2

positively charged particles found in the nucleus of an atom

Question 3

Neutrons

Answer 3

particles with no electrical charge that are found in the nucleus of an atom

Question 4

Electrons

Answer 4

negatively charged, very light particles in an atom. Electrons move around the nucleus of the atom.

Question 5

Products

Answer 5

chemical substances that result from a chemical reaction

Question 6

Reactants

Answer 6

the original substances present in a chemical reaction

Question 7

Law of conservation of mass

Answer 7

law that states that, in a chemical reaction, the total mass of the reactants is the same as the total mass of the products

Question 8

Law of constant proportions

Answer 8

law that states that, in chemical compounds, the ratio of the elements is always the same