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7F Science Revision
Chemical Reaction
| 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? | -80ºC |
| 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 |
Created by:
LongBui
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