Question | Answer |
What do you call the process when an objects changes from a solid to a iquid? | Physical Change |
What is a reversibe change? | A reversible change is when an object can change and change back to its orignal form. |
How do you know when a chemical reaction has occured? | It could change colour, a gas is given off, an energy change etc... |
The iron has reacted with oxygen and water in the air and turned a new substance -----> ????? | Iron oxide. |
When the rain is polluted with sulphuric acid and corroded the iro. What is the reactant? | Sulphuric aci and iron. |
Iron + Sulphuric acid --> ???? | Iron sulphate. |
What is the product in the reaction when iron reacts with sulphuric acid? | Hydrogen |
How can we test if there is hydrogen? | We can test for hydrogen by bringing a lighted splint to the tube of hydrogen. Hydrogens bur with a squeaky pop. |
What is dry ice? | Solid carbon dioxide. |
How can we make dry ice? | By cooling carbon dioxide down to minus eighty degrees. |
How can we test if that gas is carbon dioxide? | When carbon dioxide is mixed with limewater, it turns milky. |
Magnesium + Sulphuric acid ---> ??? | Magnesium sulphate |
What is the three words in the fire triangle? | Oxygen, fuel and heat. |
When a substance burns, what does it reacts with? | Oxygen in the air. |
Magnesium + oxygen ---> ???? | Magnesium oxide. |
Iron + Hydrochloric acid ---> ??? | Iron chloride |
Shodl we used water for electrical wires and why? | No because when you put water into electricity, you will get electricuted. |
What is the scientific name for burning? | Combustion. |
Any chemical that is made up of only hydrogen and oxygen is called what? | Hydrocarbon |
What do you get when methane isn't burnt properly? | Carbon monoxide and water |
Sodium carbonate made up of? | Sodium, carbon and oxygen |
What is NaCO? | Sodium carbonate |
Magnesium + nitric acid ---> ???? | Magneisum nitrate. |