An atom is made up
  • little particles
  • protons, neutrons and electrons
  • protons, nucleus and electrodes
  • positive, neutral and negative
Which of the following is not an example of a chemical reaction
  • burning of wood
  • freezing of water
  • rotting of fruit
  • explosion of dynamite
What two products are usually produced from a combustion reaction?
  • a chemical salt and hydrogen gas
  • oxygen gas and a cloudy liquid
  • water vapour and carbon dioxide gas
  • carbon dioxide and smoke
What is not an indication of a chemical change?
  • smell produced
  • heat produced
  • solid produced
  • melting
Name the elements inNaHCO3
  • sodium, hydrogen, carbon, oxygen
  • sulfur, hydrogen, cobolt
  • sodium, hydrogen, cobolt
  • sulfur, hydrogen, carbon trioxide
The chemical formula for sulfuric acid is H2SO4 How many atoms are present?
  • 3
  • 6
  • 7
  • 10
The atomic number of an element tells you
  • how many protons and neutrons it has
  • how many protons and electrons it has
  • its place on the periodic table
  • the mass of the nucleus
The mass of an atoms nucleus is the sum of 
  • protons + neutrons
  • electrons + neutrons
  • electrons + protons
The attraction forces between atoms are called
  • particles
  • joins
  • shells
  • bonds
Methane burning in oxygen is an example of
  • photosynthesis
  • combustion
  • decomposition
  • neutralisation
The amount of reactants should equal the amount of products.  This is the rule for
  • chemical reactions
  • acid base reactions
  • conservation of mass
  • neutralisation reactions
pH stands for
  • power of hydrogen
  • percent of hydrogen
  • possible hydrogen
  • precipitation of hydrogen
Acids have a high pH
  • True
  • False
When you vomit it tastes sour because
  • your stomach contains an acid
  • your stomach contains an alkali
Exothermic reactions
  • happen on the outside
  • take in heat
  • give off heat
  • happen on the inside
A weak acid has
  • produces lots of hydrogen gas 
  • produces a small amount of hydrogen gas
  • has lots of water
  • has little water
Dilute acids and bases have
  • lots of water mixed with them
  • not very much water mixed with them
  • lots of bubbles when metals are added
  • strong acid
Rainwater is naturally acidic because
  • rain dissolves with carbon dioxide
  • rain dissolves with oxygen
  • rain dissolves with nitrogen
  • rain dissolves with alkalis
An alkali is
  • An acid dissolve in water
  • A base dissolved in water
  • An example of stomach acid
  • An example of cleaning products
A catalyst
  • Increases the activation energy
  • Lowers the activation energy
  • Makes a reaction more difficult
  • Slows a reaction down
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