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15
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Describe how melting and boiling points of impure substances will be affected by the different concentrations of impurities.
The melting point will decrease and the boiling point will increase the impurities there are in a mixture.
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25
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Describe the following methods: Crystallisation
In this process you will heat up a solution until the point in which the solvent evaporates making the solute to attain high concentration
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15
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What is Insoluble?
when the material cannot dissolve in a solvent.
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15
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How can solutes dissolve faster in solvents?
decreasing the particle size of the solid, increasing the temperature and/or increasing the mixing or stirring rate.
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25
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Describe the following methods: Evaporation
Evaporation is a procedure to remove the volatile component of a homogenous mixture by vaporizing the liquid. For ex. Salt solution.
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25
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Describe and state their charges and mass for: ELECTRONS
ELECTRONS are negatively electrically charged and their mass is about 1800x smaller than the one from the proton which we will treat as 0.
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lifesaver
Give 15 points!
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gold
Win 50 points!
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shark
Other team loses 5 points!
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baam
Lose 25 points!
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15
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Define purity of a substance:
Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.
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monster
Reset all scores!
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gift
Win 20 points!
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gift
Win 25 points!
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lifesaver
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15
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Explain the relationship between protons and electrons in an atom
In atoms the number of protons and electrons are always the same to keep their electric charge neutral.
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15
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Describe Solute, solvent and Solution? With examples.
solutes can be liquids or solids. Solvents are always liquids. So solution is when you mix a solute and a solvent.
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15
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What is Volatile?
Is something that evaporates easily at normal temperatures.
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25
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Describe and state their charges and mass for: NEUTRONS
NEUTRONS have no electric charge and their mass is very close to the one from the proton, which by our needs can just be considered the same, 1u.
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lifesaver
Give 10 points!
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magnet
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gift
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thief
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15
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Tell the difference between homogeneous and heterogeneous mixture?
homogeneous mixture - when you cant see the difference Heterogeneous - when you can see the difference.
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15
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What is Concentration, in a substance?
concentration refers to the amount of a substance in a defined space.
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