C1 -Atomic Structure
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Why must equations always be balanced?
Because no atoms can ever be created or destroyed - total mass of product formed = total mass of reactants.
D. Mixture?
2 or more substances that are not chemically combined together.
D. Isotope?
Atoms of the same element with different number of neutrons.
What Is the similarities/differences between isotopes and original elements?
Different physical properties - high density Same chemical properties - because reactions depend on atomic structure.
What determines the way an element reacts?
The number of electrons in the puter shell.
Filtration?
Separates insoluble substances from soluble in the solvent
Filtration technique?
Collect sand on filter paper and wash to remove left over salt solution Then dry wet sand in evaporating oven
Crystallisation?
Evaporate water from NaCl solution on evaporating dish on water bath Then leave to evaporate
Distillation?
Heat solution and boil to evaporate solvent Vapour into condenser Glass tube w/ = cooling jacket Condensed back in liquid in receiving vessel
Miscible?
Mixes completely
Immiscible?
Can’t be mixed with another substance without separating from it
Fractional Distillation?
heat over glass beads higher boiling point substance condenses & drops lower boiling point substance rises into condenser condenses