Define atomic number and atomic mass and show how to identify them.
To find atomic mass we measure the amount of protons + neutrons To find atomic number we have to know the amount of protons (NEUTRAL ATOMS=NUMBER OF ELECTRONS)
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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.
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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.
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25
Describe and state their charges and mass for: PROTONS
PROTONS are positively electrically charged and have mass of 1u (atomic mass unit)
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15
What is Volatile?
Is something that evaporates easily at normal temperatures.
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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
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15
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
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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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.
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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.
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banana
Go to last place!
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rocket
Go to first place!
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shark
Other team loses 25 points!
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lifesaver
Give 5 points!
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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.
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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.
