States of matter
Draw a diagram to illustrate (show using pictures) the particles in a solid.
What is the name of the process in which a liquid becomes the gas?
evaporation
Which gas is the primary gas in air?
nitrogen
The substance that dissolves is the __________.
solute
What separation techniques should we use to separate an insoluble solid and a liquid?
Filtering/filtration
Because there are ________ space between particles in solids and liquids, solids and liquids have fixed __________, meaning that they cannot be compressed.
little, volume
What is the freezing point of water?
100℃
True or false?
Air is a mixture.
T
The substance that does the dissolving is called the __________.
solvent
The liquid that can pass the filter paper is called ______.
The solid that stays on top of the filter paper is called ________.
filtrate; residue
Particles in a solid only _____ in position; particles in a liquid ________; particles in a gas __________.
vibrate; slip (slide); move about (very fast)
Dry ice changes in to carbon dioxide gas in the process of _________.
sublimation
To test the presence of water vapor, we can use:
①________ colored cobalt chloride paper turns to _______ if there is water vapor.
② ________ anhydrous copper sulphate turn to _______ if there is water vapor.
① blue (to) pink
② white (to) blue
The maximum amount of solute that will dissolve in a certain amount of solvent at a given temperature is ___________.
solubility
If we would like to get water out of salt water, what separation technique should we use?
Distillation
Liquids have _____ density, _______ be compressed, have ______ shape, and _______ diffuse.
Give an example of condensation
water dew on a cold can of cola/fog on the bathroom mirror after a shower/answers that make sense
A student collects some gas in a conical flask. The student then add clear lime water into the conical flask and observed that the liquid becomes cloudy (milky). What is the gas the student collects?
carbon dioxide (CO2)
Normally speaking, as temperature increases, the solubility of a substance usually __________ .
increases
The reason why substances in the ink get separated because more soluble substances spread along the filter paper ______, thus they go ______ up on the filter paper.
faster; higher
Particles in _________ (state of matter) has the highest kinetic energy.
gas
An unknown substance has a melting point of 25℃ and a boiling point of 120℃. What state is this substance at 78℃?
respiration (breathing)
When a solution containing the maximum concentration of a solute dissolved in the solvent at a specified temperature, the solution is _________.
saturated
To get pure salt out of a mixture of salt, dirt and rock, what are the separation techniques should we apply? Make sure the order of separation techniques is correct.
dissolve in water→filter→evaporate the filtrate