Chemical vs. Physical Changes
Matter
Pure Substances vs. Mixtures
Labs
Solutions
100
This change creates a new substance.
Chemical change
100
What are the 3 states of matter?
Solid, liquid, and gas
100
This substance contains only one kind of particle.
Pure substance.
100
Sugar in a sugar solution is the s__________. Water is the s___________.
solute solvent
100
This solution contains more solute than the solvent can dissolve.
Supersaturated solution
200
Wood burning is an example of a ___________.
Chemical change
200
This has a definite volume and indefinite shape.
Liquid.
200
This type of mixture can be separated easily (relatively).
Heterogeneous mixture
200
What would eventually happen if a supersaturated sugar solution is cooled?
Crystallisation/precipitation of sugar
200
This refers to an insoluble solid that is made out of a solution.
Precipitate
300
A change in which chemical properties stay the same is ____________.
Physical change.
300
The particles are fixed in their positions in ___________.
Solids.
300
Carbon dioxide gas is an example of _____________.
Pure substance.
300
Give one physical change and one chemical change you noticed during the marshmallow lab.
Physical change - change in shape, wax melting and solidifying Chemical change - smell, color change
300
What does it mean to be "on" the line in a solubility graph?
The solution is saturated.
400
When a substance goes through a change in energy, which changes its state, we have a ____________.
Physical change
400
In order for a liquid to freeze, the energy of the liquid must be ___________.
removed decreased released lost
400
When 2 pure substances are combined physically, the result is a _____________.
Mixture.
400
Predict the solubility of an M&M if it is dropped into a beaker full of water, a beaker with 50% coke and 50% water, and a beaker full of coke. Ignore the effect of acid.
M&M will dissolve the most/fastest in the beaker full of water.
400
What is the difference between saturation and solubility?
Solubility refers to the ability of a solute to be dissolved. (Ex: Can sugar be dissolved in water or not?) Saturation refers to the degree to which a solute is dissolved. (Ex: Is this salt solution unsaturated, saturated, or super saturated?)
500
Explain why coke bottle fizzing is an example of physical change.
It does not create a new substance. The carbon dioxide gas is just separating from the rest of the mixture.
500
What is needed to go back & forth between each state?
Energy
500
Milk fresh out of a cow is a _______________. The milk we drink at home is a ________________.
Heterogeneous mixture. Homogeneous mixture, or solution.
500
Why did M&M's dissolve the fastest in boiling hot water and not in cold water or room temperature water?
The higher the temperature, more energy the water particles have, and therefore the faster they move.
500
What are the 3 factors that increase the rate of dissolving of a solute?
Increase in temperature Decrease in particle size (increase in surface area) Agitation/stirring
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