Chemistry
a cup of water is which domain?
Macroscopic domain
Liquid to gas = Evaporation/boiling or both?
both!
What Cannot be broken down by chemical changes is?
Element
A property that Depends on the amount of matter = ?
Extensive
Fe is an element - true / false?
true
which is the easiest to compress and the greatest speed of particles?
Liquid, Solid, or gas?
gas
which period and group is aluminium (Al) in?
period 3, group 13
Two or more atoms bonded together = ?
Molecule
Does NOT depend on amount of matter = ?
Intensive
Cl2 is what type of matter?
why is heat different to temperature in terms of extensive or intensive properties?
it differs because heat depends on the amount of matter that you have. Temperature does not.
MgI2 is what type of compound?
Ionic compound.
give the charge type for all of these sub-atomic particles:
electron
proton
neutron
negative
positive
no charge
Make the question!!! This phase change happens when a solid turns directly into a gas without becoming a liquid first. Dry ice does this.
what happens in sublimations
what is a heterogeneous mixture?
a substance where the different components or parts are not mixed evenly.
what happens in sublimation?
solid to gas phase
Water expands and turns into ice. give the question for this
What is freezing?
Air, sports drink, salt water are examples of one type of mixture. Give an example of the other type of mixture and give the name of the type of mixture.
Heterogeneous mixture
Is density intensive or extensive?
Intensive
what happens in deposition?
gas to solid
what is the difference between bohr structure of a formula unit and bohr structure of a molecular formula? Give 2 differences
1. for the formula unit: the ions structures do not touch or overlap.
for the molecular formula, they do touch/overlap.
2. for the formula unit. the ions have charges + and -
for the molecular formula the bohr structure has no charges.
carbon dioxide forms what type of formula? What does its valence electrons do in a bond?
molecular formula. they share
justify the reason that in a closed system, that a piece of coal stays the same mass after burning.
because the products of ash, gases and other compounds cannot escape.
give 2 differences between mass number and atomic mass
mass number has no decimal point but atomic mass does.
mass number = number of protons and neutrons but atomic mass is an average value.
explain how you would calculate the mass of this..
Al2(SO4)3
1. multiply atomic mass of oxygen by 4.
2. multiply atomic mass of Al by 2.
3. multiply everything in brackets by 3.
4. Add everything finally