Question | Answer |
Define physical change | It is when the change that occurs is reversible and that no new substances are formed |
Define reversible | It is when something can be reversed or change back into its original state |
Name all of the new substances formed during a chemical reaction | -Change in colour
-Gas given off
-Energy change |
Define permanent | It is irreversible and cannot be change back |
Define decompose | It is when chemicals split up during a reaction |
Another word for splitting water with electricity | Electrolysis |
What is the type of change/reaction when water turns into ice? | Physical Change |
What are produced when fireworks goes off? | colour, sound, heat, light, CO2 |
What are the two type of gases that are made when water is split? | Hydrogen and Oxygen |
Define reactants | When two things react to each other, that are the reactants |
What are the reactants during water freezing? | water and the temperature |
What are the reactants during leaves burning | Fire and Leaves |
What are produced when iron reacts with sulphuric acid | Hydrogen and Iron Sulphate |
What is a product? | Something that is made during a Chemical Reaction |
What are the product when a paper is burning? | CO2 and Ashes |
How can we test if the reaction produces Hydrogen? | Perform the squeaky pop test |
Iron + Sulphuric Acid = | Hydrogen and Iron Sulphate |
Define rust | Rusting is an example of Corrosion, it is cause by the o2 and water in the air turning into |
what is another way to say rust? | Iron Oxide |
What is Corrosion | It is when something is broken down and take away. |
What type of acid can acid rain be made of? | Nitric or Sulphuric Acid |
What is corrosive? | It is an object that take away thing or break things down e.g acid |
What's an acid rain | It is when nitric or sulphuric acid pollutes the rain causing it to rain acid down. |
what is dry ice | Solid C02 |
What's the temperature to cool down co2 to make dry ice? | -80ÂșC |
What will happen after you cool co2 down? | It turns straight into dry ice without melting |
Why are dry ice useful | It can use to make a foggy effect |
What is the gas given off when limestone reacts to acid | CO2 |
How to be sure if a reaction gives off c02 and not other gas? | Do the limewater test |
Define chemical reaction | It is when chemical break apart or join to form something new |