C1 Flashcards
What is the relative charge of a neutron
Neutrons relative charge is 0
What’s the relative mass of a neutron
The relative mass of a neutron is 1
What is meant by isotopes
Isotopes are different forms of an element
They have the SAME PROTONS and DIFFERENT NEUTRONS
Why do atoms have no charge
Atoms have the same proton and electron
Are the properties of a compound the same
Compounds often have different properties to the original
Where are the reactants found
Reactants are found on the left hand side
What’s a compound
A compound is a substance that is formed from two or more different elements
What’s type of process is needed to separated compounds into elements
You need a chemical reaction to separate compounds to elements
Why should you put a lid on the container during a chromatography experiment
A lid helps stop the solvent from evaporating
T/ f
When substances are combined in a mixture does their chemical properties change
False the chemical properties of the substance in a mixture are unchanged
What’s a solvent front
A solvent front is the point that the solvent in the paper chromatography reaches as it moves up the paper
What’s a mixture
A mixture consists two or more. Elements or compound that are combined. NOT CHEMICALLY
Why can you not use a pen in chromatography
The line should be drawn in a pencil because the ink from the pen will dissolved into the solvent
When can you use filtration to separate a mixture
Filtration can be used when
when is crystallisation used to separate a mixture
crystallisation is used to separate a soluble solid from solution
why might crystallisation be used instead of evaporation
crystallisation will be used if the salt will break down when heated
what equipment do you need for crystallisation
equipment for crystallisation
- evaporating dish
- heat source
- beaker
- flask
- filter paper
- funnel
in fractional distillation where is the hottest point
the bottom of the fractional distillation is the hottest point
what sort of mixture can a fractional distillation be used to separate
fractional distillation is used to separate mixtures of liquids with a similar boiling point
what does the plum pudding model describe
the plum pudding model described atoms being a positive charge with electrons stuck to them
describe alpha particles
alpha particles were fired at a thin sheet of god
most went straight
some were deflected
this meant that positive charge couldn’t be spread out evenly as the plum pudding described
what did James Chadwick provide evidence for
James Chadwick provided evidence for the existence of neutron with the nuclei of atoms
what did Bohr suggest
bohr suggested that electrons orbit around the nucleus is a fixed distance from the nucleus
wheres the lowest energy found in an atom
lowest energy is found in the first shell
what did Mendeleev discover
Mendeleev discovered
- properties of elements
- relative atomic mass
- ordering elements on periodic table
whats a metal
a metal are elements which can form positive ions
where are the metals founds on the periodic table
metals are found on the bottom left of the periodic table
properties of a metal
Metal
- strong
- good conductors
- high melting/boiling points
why do most metals have similar properties?
Most metals have similar properties because they have metallic bonds which causes them to
why is it easy for elements at the bottom to lose electrons
its easy for metals at the bottom of the periodic table to lose because they have more shells of electron at the top so their outer electrons are further from the nucleus
where are transition metals found
transition metals for found in the centre of the periodic table
describe group 1 metals reacting
group one metals will react more vigorously with wateror oxygen or group 7 elements
what sort of compound do halogens form with non metals
halogen reacting with non metals forms simple molecular compounds
they contain covalent bonds (shared electrons)
