Chemistry Flashcards
Why does black stuff appear on the surface when the alkali metals are cut?
It gets oxidised
What group is halogens in?
Group seven
What are four things that catalysts do?
- speed up the reaction.
- specific to a certain reaction.
- it is NOT used up in the reaction.
- they lower the energy needed for a reaction to happen.
What is thermal decomposition?
A reaction where a chemical breaks down into two or more smaller chemicals by heat.
How to remember reactivity series?! Please Stop Calling Me A Careless Zebra Instead Try Learning How Copper Saves Gold
Potassium Sodium Calcium Magnesium Aluminium Carbon Zinc Iron Tin Lead Hydrogen Copper Silver Gold
What is an element?
A substance made up of only one type of atom.
What is an atom
A small part of an element (that can exist)
What is a compound ?
Substance that contains one or more type of of atom that are chemically bonded together.
What is a mixture?
Substance that contains one or more type of atom that are NOT chemically bonded together.
What is chromatography?
Seperation technique used to separate and identify chemicals in a mixture.
What is it called when a liquid turns into a gas?
Sublimation
What is the positive result for oxygen
Splint re lights
What is the positive result for hydrogen
Squeaky pop test
What is the positive result for carbon dioxide?
Lime water will go cloudy
What is the charge for protons?
+1
