7f Bubbles, Bangs And Burnings Flashcards
Chemical reaction occurs when chemicals
Join or break apart to form new chemicals
In a physical change
No new substances are formed and are usually reversible
Chemical reactions produce
A new substance . Mostly a irreversible change
Observations to decide whether a chemical reaction has taken place
Change colour
A gas is given off
Fizzing
It gets hotter
Corrosion def and example
A metal reaction between a metal and gases in the air for example an oxide layer which often weakens the metal .
How to test for hydrogen
Bring a lighted splint to a test tube containing the gas . It will go out with a pop .. called the squeaky pop test
Dry ice is
Solid carbon dioxide
To test for carbon dioxide
Mix the gas with limewater if it goes milky it is carbon dioxide
Name the reactants and the product in the word equation magnesium plus oxygen arrow magnesium oxide .
Magnesium and oxygen are the reactants
Magnesium oxide is the product
Fire triangle consists of three things you need for a fire , what are they
Oxygen, heat, fuel
Burning is also known as
Combustion
Why is energy not usually written in a chemical reaction
As it is not a chemical substance so it is not a product
Carbon and hydrogen reacts to make
Hydrocarbon
Methane plus oxygen arrow
Carbon dioxide plus water
Methane plus oxygen
Arrow carbon monoxide and water
