8th grade Science, Describing Matter Review
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30 Terms
Fireworks are an example of an
exothermic change
How much "stuff" there is in a particular space refers to which property?
density
How shiny an object is refers to which property?
luster
If a large ice sculpture has a density of 1 g/cm3
then an ice cube frozen from the same water will have a density of 1g/cm3.
The tendency of a substance to undergo a chemical reaction refers to which property?
reactivity
The measure of how easily something will catch fire refers to which property
flammability
Which of the following is a sign that a chemical change has taken place?
unexpected color change
What kind of change is baking a cake
chemical
What kind of change is it if a dog gets a haircut
physical
Using an ice pack is an example of
endothermic reaction
How would you separate the different components of blood?
use a centrifuge
How would you separate iron shavings and sand?
use a magnet
How would you separate the components of salt water?
use evaporation
In an endothermic reaction the temperature of the substance __________ and feels__________.
increases; cold
In an exothermic reaction the temperature of the substance __________ and feels__________.
decreases; hot
Which of the following are physical properties?
solubility
Which of the following are chemical properties?
reactivity
What kind of change is melting ice?
physical
What kind of change is burning wood?
chemical
Salt (NaCl) is an example of a(n)
compound
Calcium is an example of a(n)
element
Air is an example of a(n)
mixture
If your pencil has a mass of 100g and a volume of 50 cm3. What is the density?
2 g/cm3
The ability of one substance to dissolve within another substance refers to which property?
solubility
The ability of a substance to be shaped or molded refers to which property?
malleability
The unit for density is
g/cm3
This picture can best be described as
pure compound
This picture can best be described as
mixture of elements
This picture can best be described as
mixture of elements & compounds
This picture can best be described as
mixture of compounds