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Science - Check your knowledge 2
Game Code: 1008557
English
19
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Science
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Ana Carolina Almeida Bitencour
82
Share Science - Check your knowledge 2
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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.
15
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.
15
What is Insoluble?
when the material cannot dissolve in a solvent.
15
What is Volatile?
Is something that evaporates easily at normal temperatures.
15
What is Concentration, in a substance?
concentration refers to the amount of a substance in a defined space.
15
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.
15
How does temperature affect diffusion of gaseous substances?
Diffusion is faster at higher temperatures because the gas molecules have greater kinetic energy, because of that, they move faster.
15
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.
15
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.
15
Describe the following methods: Filtration
This process consists on running a mixture of solid and liquid through a paper filter and separate both
25
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
25
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.
25
Describe the following methods: Simple Distillation
The mixture is heated until boiling point, the gaseous component is then condensed into its liquid state giving out an almost pure substance.
25
Describe the following methods: fractional distillation
.
25
Describe and state their charges and mass for: PROTONS
PROTONS are positively electrically charged and have mass of 1u (atomic mass unit)
25
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.
25
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