Chemistry 3.1 Flashcards
List signs of a physical change
- No new substances created
- Easy to reverse
- Small amount of energy released/ absorbed
List signs of a chemical change
- New substances created
- Difficult to reverse
- Large amounts of energy absorbed or released
Chemical test for water present
Anhydrous copper (III) Sulfate turns from white to blue
Physical Test for pure water
Test the melting point and boiling point.
MP = 0
BP= 100
Definition of element
A substance containing only one type of atom
Properties of metals
- High MP/BP
-Malleable
-Good electrical/ heat conductors - Shiny
Properties of non-metals
- Low MP/BP
- Brittle
- Electrical insulators
- Dull
Where are non- metals found in the Periodic Table?
(Top) Right hand side of periodic table
Diatomic Elements?
Bromine (Because)
Oxygen (Of)
Chlorine (Chemistry)
Iodine (I)
Hydrogen (Have)
Nitrogen (No)
Fluorine (Friends)
Compound definition
Substance containing more than one type of atom, chemically bonded together.
How can compounds be formed?
By heating their elements together. For example, zinc + sulphur —> zinc sulphide
Are the properties of a compound similar or different to the properties of the elements it is made from?
Different
Ammonium Chloride word equation
Ammonia + Hydrogen Chloride -> Ammonium Chloride
Why does it take longer for some substances to diffuse slower?
Their molecules/ atoms are heavier.
When you heat up a diffusion tube what happens?
The product forms faster because the particles move faster and collide more often. It still forms in the same place because both of the gases diffuse faster.
