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chapter 3 test study guide 8th grade
Terms in this set (22)
is anything that has mass and takes up space
the amount of space an item occupies
Mass is the amount of matter in a substance or object
is the amount of mass per volume D=m/v
is a pure substance that can not be broken down into any other substance
when two or more atoms combine chemically
is the smallest particle of a compound and consists of two or more atoms that are joined together
is a combination of two or more substances in any proportion is not chemically combined
Explain how you would measure the mass, volume and density of the following rock (be sure to specify which instrument and SI unit you would use for each measurement.
to measure the mass of this rock you would use a scale in grams, for the volume you would fill a graduated cylinder with water then put the rock in then subtract the amount that the water raised minus the amount that the water level was already at using ml/ l / or cm3 for solids. To find the density you would use the formula D=m/v is considered a derived quantity because you have to use calculations to get to
Explain why your weight would change in the moon but your mass would remain constant.
Your weight would change on the moon because of the fact that weight is simply how much gravity there is around you and since the moon is much smaller than the earth, and the gravity is lighter you would not be the same. The reason the mass would not change would be that mass is the amount of matter, and this would not change at the moon
How are the physical properties of matter different from chemical properties?
a physical property is a property that you can observe without any changes, matter does not have to change for us to observe it. / a chemical property= matter would have to change to be observed
List four physical properties of matter. Explain how you know they are physical properties.
Melting point, boiling point, color, odor
List three chemical properties of matter. Explain how you know they are physical properties
Flammability, , toxicity, ability to oxidize,
Distinguish a compound from a mixture
A compound is a chemical combination of two or more molecules a mixture is two or more combinations of molecules not chemically combined in any amount of either material
2. Use the space provided below to draw a 2-D model of a compound, molecule and mixture.
Compare and contrast a colloid, suspension and a solution
Colloid: homogeneous particles reflect light, particles too small to be seen suspension: large enough to be seen reflects light heterogenious solution: cannot see particles homo genious does not reflect light
Distinguish a heterogeneous mixture from a homogeneous mixture.
A heterogeneous mixture has all particles mixed evenly together, a homogeneous mixture is not mixed together and might visually look separated
Distinguish a physical change from a chemical change.
a physical change is a change where the substance does'nt change into another substance and can be reversed / a chemical change is a
Describe the law of conservation of mass
The law states that matter cannot be created or destroyed
Provide five examples of a physical change
example; Ice to water/ water to steam/ molten iron to iron / steam to water/ water to ice
Provide five examples of a chemical change.
example; Iron to rust / gasoline is ignited / vinegar and baking soda / frying an egg / a penny tarnishes
Provide three signs of a chemical change.
Gas bubbles are released, something changes color, a odor is released
instruments used to measure mass, volume, density, and matter
mass= scale/ volume=graduated cylinder/ density= scale and graduated cylinder/
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