Matter Vocabulary
one of the methods to separate mixtures. it is a separation technique that utilizes centrifugal force to separate components of a mixture based on their size and density. heavier particles settle at the bottom.
Which method fo separating mixtures uses the property of solubility? Explain how it works.
Filtration: liquid passes through filter paper, solid particles stay behind.
An atom is the smallest unit of an element that maintains _____ of that element.
Which of the following is an example of a physical change? a. Water freezing into ice. b. A piece of wood burning. c. A toy car rusting. d. Zinc producing hydrogen gas when mixed with water
water freezing into ice
what is tyndall effect?
the scattering of light by particles in a colloid or fine suspension, which makes the path of a light beam visible
For substance A, if we decrease the mass into half, what will happen to its density.
For an element, what can be changed but what must stay the same?
For a element to stay consistent, proton number should stay the same. Neutron or electron number can change.
Not everything is matter. Give examples of things that are not matter
light, sound, feelings, heat, electricity, thoughts
What change has occurred when a nail rusts?
chemical change
What is compound?
molecule made from atoms of two or more elements
What's the easiest way to add energy to matter? a. Heating it b. Cooling it c. Decreasing pressure d. Decreasing temperature
A. Heating it
Classify whether the following are molecule, compound, both, or neither.
1. CO2
2. O2
3. C6H12O6
4. N
1. molecule & compound
2. molecule
3. molecule & compound
4. neither (it's an element)
If a substance's melting point is at 291 degree Celcius and vaporization point at 321 degree Celcius, what temperature range does it have to have to stay in solid state?
<291 degree Celcius.
what are the six evidences of chemical change?
changes in temperature
changes in color
light
bubbles or gas
solid forming from liquid (precipitate)
new smell
What is a suspension? Give examples as well.
This is the only type of mixture among the three whose particles can be separated using ordinary filter paper. (i.e. muddy water, chocolate milk, oil & vinegar mixture)
Compared to ice, how do molecules of water behave? a. They move less freely. b. They are locked into a crystal lattice. c. They move more freely. d. They bounce off one another randomly.
C. move more freely
(true or false) Mixtures can be solution, but not all solutions are mixtures.
False. All solutions are mixture.
Are ice and water made up of the same matter? Explain.
Yes. They are both made out of H2O.
What happens to the mass of water as it turns into a gas?
It stays the same.
what is a colloid? (particle size, whether the particles settle, transparency, whether they scatter light). Give examples.
particle size: 1nm~1000nm. Particles do not settle, they stay evenly distributed. They are transparent, scatter light.
Examples: fog, whipped cream, milk, cloud.
why is it important for water to have an exception for its density property as it takes the form of ice, compared to other liquid?
Water (solid) have less density when in water (liquid). This is important because matter with less density floats above denser matter. During winter, aquatic life can survive because ice forms above the liquid water.
list all the exothermic changes we learned.
Freezing (Solidification)
Condensation
Deposition
List all the differences between evaporation and boiling (in terms of speed, location, temperature, and the presence of bubbles)
In any physical or chemical change, the ____ stays the same according to ____. But in a chemical change, the ______ must change.
total mass (of the atoms); conservation of mass; type of molecules.