Chemical And Physical Reactions Flashcards
Is there a reaction between lemon juice and bicarbonate of soda?
Yes
How do you know there is a reaction between the lemon juice and bicarbonate of soda?
There are bubbles (effervescence)
Can the lemon juice and bicarbonate of soda reaction be reversed?
No
Is the reaction between the lemon juice and bicarbonate of soda a physical or chemical change?
Chemical
Why is the reaction between the lemon juice and bicarbonate of soda a chemical reaction?
Because it has given off a gas
Is there a reaction between baking powder and water?
Yes
How do you know there is a reaction between baking powder and water?
Effervescence has occurred
Can the reaction between baking powder and water be reversed?
No
Was the reaction between baking powder and water a chemical or physical change?
It was a chemical change
Why was the experiment between baking powder and water a chemical reaction?
A gas was given off
Is there a reaction between iron wool and copper sulphate solution?
Yes
How do you know there is a reaction between iron wool and copper sulphate solution?
There was a colour change
Can the experiment between iron wool and copper sulphate solution be reversed?
No
Is the reaction between the iron wool and copper sulphate solution a chemical or physical change
A chemical reaction
Why is the reaction between iron wool and copper sulphate solution?
There was a colour change
Is there a reaction between starch and iodine?
Yes
How do you know there is a reaction between starch and iodine?
There was a colour change
Can the reaction between starch and iodine be reversed?
no
Is the reaction between starch and iodine a chemical or physical change?
It’s a chemical change
How do you know the reaction between starch and iodine is a chemical?
A colour change
Is there reaction between salt and water?
No
How do you know there isn’t reaction between salt and water?
Dissolving isn’t a reaction
Can the ‘reaction’ between salt and water be reversed?
Yes
Is the experiment with water and salt a chemical or physical change?
A physical change
In the experiment melting ice is there a reaction?
No
Could the experiment of ice melting be reversed?
Yes
What is a chemical reaction?
A chemical reaction is two substances (reactants) react together to make one or more new substances (products)
Is a chemical reaction irreversible?
Usually a chemical reaction is irreversible meaning it is impossible to reverse the reaction and get the original substances back
How does the physical reaction occur?
If a change happens to a substance but no new product is made then it is called a physical change
Name some chemical reactions:
Adding an acid to an alkali Fireworks Driving a car Frying an egg Burning a candle Lighting a match Baking a cake Launching a space rocket
Name some physical reactions:
Ice cream melting Boiling the kettle Melting candle wax Dissolving sugar in tea Making ice cubes Ironing clothes Printing
