Vocabulary
When lemonade powder is dissolved in water, what is the solvent?
Water
What is a mixture?
A substance with 2 or more elements and/or compounds that are not chemically combined.
A solution is a type of __________________
mixture
What state of matter is H2O?
Liquid - Water
Solid - Ice
Why do we separate mixtures?
To different parts of the mixture away from each other.
When baby powder is mixed with water, what is the solute?
baby powder
Give an example of a mixture
Example: Coffee
Give an example of a solution
Example: salt water
What is density? give example
How much mass of a substance per volume.
e.g. 20g/L this means for every Litre of volume there is 20g of the substance.
What are 3 ways we can separate mixtures?
Magnetism, Evaporation, Filtration, Sieving, Chromatography
To dilute a mixture means to make it less __________
Concentrated
True or false?
All solutions are mixtures, but not all mixtures are solutions
True
solute and solvent
Why are concentrations important in science?
They can change the intensity/rate of a chemical reaction
What is evaporation used for?
Evaporation is used to separate solute from solvent.
Solutions that can no longer dissolve and solutes is called ___________
fully saturated
True or false?
Some mixtures are solutions and some solutions are mixtures.
False
What is Buoyancy and what determines something's buoyancy?
Buoyancy is how well something floats on water and it is determined by the objects density. If it has less density than water it will be more buoyant.
Filtration is used to separate soluble materials from non-soluble materials. e.g. Sand from water
Solutions that have more solutes dissolved in it than the solvent allows is called _______
Supersaturated
What word do we use when a solution is made less concentrated?
Dilute or dilution
How do we calculate density of an irregular sized object?
1. Weigh the object to find it's mass
2. Fill water in a beaker or measuring cylinder
3. Note it's volume, place the object inside and note the amount it has changed. That is the volume of the object
4. Calculate the density by dividing the mass by it's volume.
What is chromatography used for? Provide example.
Chromatography is used to separate materials of different solubilities from each other. e.g. Separating the different colours used to make ink