Chemical Changes Flashcards
What would the colour of the mixture of universal indicator and hydrochloric acid be?
Red/orange/yellow
What would the pH of hydrochloric acid be?
1/2/3
Why would there be fizzing when a crushed indigestion tablet be put into hydrochloric acid?
Carbon dioxide was being produced
If you added a big amount of crushed indigestion tablets to hydrochloric acid, why would the fizzing stop at one point?
All of the acid would have been neutralised
When magnesium carbonate reacts with hydrochloric acid, magnesium chloride is formed
Give 2 words that describe magnesium chloride
A compound and a salt
Why is hydrochloric acid needed in the stomach?
So that we can properly digest our food
What is called when a human inhales oxygen and exhales carbon dioxide?
Respiration
What is it called when factories take in oxygen and release carbon dioxide?
Combustion
What is the word equation for fossil fuels, such as natural gas?
Methane+Oxygen—>Carbon Dioxide+Water
Give one problem that is caused by the formation of large amounts of carbon dioxide
Global warming
Why does opening the air hole of a Bunsen burner make the flame hotter?
Because oxygen is being let in
What is the word equation for the chemical reaction in a clear blue flame of a Bunsen burner?
Methane+Oxygen—>Carbon Dioxide+Water
What is a liquid fuel that is stored in tanks, not stored under pressure, and flows along a pipe to where it is needed?
Petrol
What is a gas fuel that is stored under pressure in small cylinders and is used by campers?
Methane
What is a solid fuel that can be stored in sacks or bags?
Coal
