intro to year 10 chemistry

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 is not an indication of a chemical change?

• smell produced
• heat produced
• solid produced
• melting

Name the elements in
NaHCO₃

• 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

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

Exothermic reactions

• happen on the outside
• take in heat
• give off heat
• happen on the inside