Physical and Chemical Changes Flashcards
(20 cards)
What is Combustion?
A chemical reaction which a substance is heated in the presence of oxygen to for one or more substances.
What is Thermal Decomposition?
A process in which a substance breaks down into 2 or more simpler substances upon heating.
What is Oxidation?
When matter interacts with oxygen, it undergoes through a chemical change called oxidation
What are IRL examples of Oxidation?
Rusting and Cellular Respiration.
What is Cellular Respiration?
Every time the apple (or any fruit or vegetable), glucose made by the plant during photosynthesis comes intact with oxygen and thus produces carbon dioxide.
How does Neutralisation work?
When an Acid is mixed with Alkaline, a neutralisation reaction.
What are properties of Acids?
1) Have a sour taste.
2) Some are corrosive (burn the skin).
3) Turns blue litmus paper red.
4) Reacts with Alkalis, Metals and Carbonates.
What are properties of Alkalis?
1) Have a bitter taste.
2) Have a soapy feel.
3) Some alkalis are corrosive (burn skin).
4) Reacts with Acids, Metals and Carbonates.
What are the examples of Acid?
Hydrochloride acid, sulfric acid, nitric acid, acetic acid (vinegar), ascorbic acid (vitamin C), and citric acid (oranges).
What are examples of Alkalis?
Sodium hydroxide, calcium hydroxide, potassium hydroxide, baking soda and ammonia.
What is an example of a word equation of a chemical reaction of Acids and Alkali?
hydrochloric acid (acid) + sodium hydroxide (alkali) = sodium chloride (salt) + water
What is an example of a word equation of a chemical reaction of Acids and Metals?
hydrochloric acid (acid) + magnesium (metal) = magnesium chloride + hydrogen
What is an example of a word equation of a chemical reaction of Acids and Carbonates?
Hydrochloric Acid (acid) + magnesium carbonate (carbonate) = magnesium chloride (salt) + carbon dioxide + water.
How to test for hydrogen?
We an use a lighed splint which extinguishes a ‘pop’ sound of hydrogen gas.
How to test for carbon dioxide?
Use limewater, where white percipitate will be formed.
What are the 2 types of splints?
Glowing and Lighted Splint
What happens to a Blue Litmus Paper in an Acidic Solution?
It turns red.
What happens to a Red Litmus Paper in an Alkaline Solution?
It turns Blue.
What is the difference between a lighted splint and a glowing splint?
A lighted splint is used to test hydrogen and it pops and immediately diffuses but a glowing splint is used to test oxygen and it glows.
