C4 questions I got wrong Flashcards
When a gas is creates why does the mass usually decrease during a reaction?
The gas escapes
What is a control variable?
The part of the experiment that remains constant
What is a dependent variable?
The variable that changes as you change the independent variable and you then record it
What is an independent variable?
The variable that you change
Why would magnesium need heat to start reacting?
The heat provides energy for the reactions and it breaks bonds.
How would you need to test for hydrogen?
Use the lit splint test and if there is hydrogen it would create a squeaky pop sound.
Why would a reaction not give the full amount of a product?
Due to side reactants.
What does a catalyst do?
It speeds up reactions, making things more efficient.
Why must hydrogen be burned off?
To stop it escaping into the air because it is explosive.
