Mixtures / Solutions
Name an example of a mixture
Answers vary
Name the three states of matter
Solid, Liquid, Gas
How can a mud water solution be separated?
Filtration
What is chromatography?
A separation techniques used to separate miscible liquids/ liquids which are mixed together from each other
Name the equipment in a filtration lab (4 pieces)
conical flask, filtration paper, funnel, beaker with solution.
True or false? The components in a mixture are chemically joined together
False
True or false? The molecules in a solid are close together
True
What is the name given to the water which is separated in a filtration lab?
Filtrate
What piece of scientific equipment is used to measure liquids accurately?
Measuring Cylinder
Define the term 'mixture'
A combination of two or more substances in which no new substances are formed
In a solution which part of the solution is the solute: salt or water?
salt
What is the name of the process of a gas changing into a liquid?
Condensation
Complete the sentence: Evaporation uses heat to separate a _______ solid from a liquid
Dissolved or soluble
In order to recollect only the salt from sea water the most simple method of separation would be
Evaporation
Define the term 'pure substance'
A substance that is made up of only one type of stuff; contrasted with a mixture
What is a solution?
A combination of a dissolved substance (solute) and a solvent
In which state of matter does the matter have the most energy?
Gas
What is a solute?
The solid that is dissolved
The substance doing the dissolving
Solvent
What is a potential error you could make when completing the filtration practical?
Stirring too vigorously/fast, Stirring the mixture while pouring it, pouring to fast, Was the filter paper folded properly, Wrong size filter paper.
How are mixtures and solutions different from each other?
the mixture combines physically and the solution is not easily separated
Name the change of state that occurs during evaporation?
Liquid to gas
Explain how the particles in liquids behave when moving from one container to another container.?
The particles in a liquid are close together but can move around each other. When the liquid is poured from 1 container into another, the particles slide past each other and flow into the new shape.
Liquids do not keep their own shape, so the particles spread out to fit the shape of the other container. The particles stay close together the whole time but move freely to fill the bottom of the new container.
Describe how sieving works to separate mixtures?
Give me 1 example.
Sieving is a way to separate things in a mixture based on their particle sizes. A sieve has small holes that let smaller particles go through, but bigger ones stay on top.
Example: Separating mixture of sand and gravel
Pour the mixture of sand and gravel onto the sieve. Gently shake the sieve, the fine sand particles fall through the holes and are collected in a container below. The larger, heavier pieces of gravel are too big to fit through the holes, so they remain on top of the sieve.
Explain why solids cannot be compressed?
In a solid the particles are packed together very closely as a lattice structure. The particles in a solid are held together by very strong intermolecular forces of attraction. Due to this, the particles are in fixed positions. If the particles in solids are compressed, these particles that are already tightly packed, will push away from each other. In this way, the solids maintain a fixed volume that is very difficult to change.