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G7 Unit 3 and 4
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_________________ is the technique used to separate a pure liquid from a solid-liquid or liquid-liquid mixture.
Distillation
A technique used to separate different dyes in the ink mixture.
chromatography
Explain why solid particles can be separated from a liquid by filtration.
The filter paper allows tiny water molecules to pass through the tiny pores in the paper, whilst holding back the much larger particles of solid.
The technique used to separate a mixture depends on ________________________ and _____________.
physical properties of the substances present in the mixture and substance(s) to be obtained from the mixture.
_____________________ is the technique used to separate dissolve solids from a solid-liquid mixture.
Evaporation
The pure liquid collected from distillation is called the ____________.
distillate
The trapped solid particles that remain on the filter paper is called the ___________.
residue
The liquid that passes through the filter is called the ________________.
filtrate
Give the different properties of an element, compound and mixtures.
Element is pure, made up of 1 kind of atom. Compound are made up of different elements that are chemically combined. Mixtures are not chemically combined.
_____________is a metal that is liquid in a room temperature. State the common use of the said metal.
Mercury. It is used in the thermometers.
Give 3 factors that can affect the rate of solubility.
temperature, size of solute particles, rate of stirring
Give the difference between solubility and rate of solubility.
The rate of solubility is the amount of solute that dissolves in a fixed volume of solvent, given a fixed amount of time
Give 3 factors that can affect the solubility of a solute.
nature of the solvent, nature of the solute, temperature
What is solubility?
The ability of a solute to dissolve in a solvent.
True of False: A suspension is a mixture that dissolves in a solvent.
False. The insoluble substances are suspended in a liquid or gas.
True or False: When a mixture is formed, no chemical reaction occurs. Hence, a chemical reaction can be separated easily by physical methods.
True
Element, Compound, Mixture: It can be broken down by chemical methods.
compound
True or False: The elements that make up a compound are always combined in a fixed proportion.
True
Element, Compound, Mixture: Sodium Chloride (table salt) that is used for cooking
compound
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