Year 9 GCSE Chemistry (Downlands)

What are the three main sub-atomic particles?

• A.  Protons, neutrons and electrons
• B.  Ionic, covalent and metallic.
• C.  Nucleus and electrons and protons
• D.  Compounds, elements and mixtures

What is the charge on a proton

• A.     Negative
• B.     Neutral
• C.     No charge
• D.     Positive

Why is there no overall charge on an atom?

• A. There are the same number of protons and neutrons.
• B. There are the same number of protons and electrons.
• C. There are the same number of neutrons and electrons.
• D. There are different numbers of protons and electrons.

What makes an atom energetically stable?

• A.    Eight electrons in their inner shell.
• B.    More neutrons than electrons.
• C.    A full outer shell of electrons.
• D.    More protons than neutrons.

Which of these is a mixture?

• A.  Carbon dioxide
• B.  Sea water
• C.  Sodium chloride
• D.  Water

How could we separate two or more liquids?

• A.     Filtration
• B.     Chromatography
• C.     Fractional distillation
• D.     Sieving

How could a mixture of food colourings be separated?

• A.     Chromatography
• B.     Filtration
• C.     Fractional distillation
• D.     Sieving

Which of these is a chemical reaction?

• A.     Distillation
• B.     Evaporation
• C.     Melting
• D.     Frying an egg

What does the plum pudding model of the atom suggest?

• A.  An atom has a positive nucleus orbited by negative electrons.
• B.  An atom has a distinct nucleus.
• C.  An atom is a ball of dilute positive charge with neutrons in it
• D.  An atom is a ball of dilute positive charge with electrons in it.

Who discovered the electron?

• A.     Ernest Rutherford
• B.     JJ Thompson
• C.     Niels Bohr
• D.     Copernicus