What is the meaning of the term "isotope"?
Atoms with the same number of protons but different number of neutrons
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
State 2 physical properties of all metals (10points)
Conduct heat/electricity, ductile, shiny surface
In chromatography, we draw the base-line in pencil because...
ink would dissolve in solvent
Name this process
distillation
In chromatography, name the liquid that the pigments are dissolved in
solvent or alcohol
When a metal compound reacts with an acid, what is produced? (10 points)
Gas and Salt
State the conditions needed for rusting
Oxygen and Water
Atoms contains protons, neutrons and electrons. Protons are ______ charged.
Positively
Explain why painting an iron object prevents it from rusting
The layer of paint stops air and water reacting with the iron
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
Using the periodic table, find the number of protons in one atom of Carbon
6
What pH value is neutral?
pH7
Potassium Hydroxide reacts with Hydrochloric Acid. Name the salt Produced
Potassium Chloride