Atoms contains protons, neutrons and electrons. Protons are ______ charged.
Positively
State the conditions needed for rusting
Oxygen and Water
Explain why painting an iron object prevents it from rusting
The layer of paint stops air and water reacting with the iron
What pH value is neutral?
pH7
In chromatography, name the liquid that the pigments are dissolved in
solvent or alcohol
In chromatography, we draw the base-line in pencil because...
ink would dissolve in solvent
State 2 physical properties of all metals (10points)
Conduct heat/electricity, ductile, shiny surface
What does a cooling curve show?
It shows how the temperature changes as a substance is cooled down.
Particles in a gas are arranged....
Far apart
When a metal compound reacts with an acid, what is produced? (10 points)
Gas and Salt
Potassium Hydroxide reacts with Hydrochloric Acid. Name the salt Produced
Potassium Chloride
What is the meaning of the term "isotope"?
Atoms with the same number of protons but different number of neutrons
Name this process
distillation
Word equation for Water reacting with Sodium
sodium + water => sodium hydroxide + hydrogen
When measuring a liquid being heated, we should stir the liquid. Why?
To ensure the temperature is same throughout
