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Chemistry quiz 2

Terms in this set (28)

Calculate the density of an object when the volume is 450 cm^3 and its mass is 700 g. Give your answer to 3 significant figures.
1.56 g/cm^3
Mass per unit volume is known as?
density
density formula
D=m/v
Calculate the density of an object with a mass of 300 g and a volume of 150 cm^3
2 g/cm^3
A _________________ is a substance made of 2 or more elements that are chemically combined in a set ratio.
compound
A _____________________ is made of 2 or more substances that are together in the same place, but their atoms are not chemically bonded.
mixture
A ______________ mixture is when you can usually see the different parts and the can easily be separated
heterogeneous
A _______________ mixture is when the parts of the mixture are evenly mixed and you can't see the different parts
homogeneous
An ________ is a substance that cannot be broken down to other substances by chemical reactions.
element
An element is made up of only one kind of _____.
atom
Which among the following is an element?

brass
bronze
silver
stainless steel
silver
Which of the following are pure substances?

elements
colloids
heterogeneous mixture
solutions
elemenys
An ______________ is the basic particle from which all elements are made.
atom
The students measured length during a science experiment, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?
15.79%
Ms. Perun estimates the weight of her cat, Pumpkin, to be 8 pounds. The actual weight of Pumpkin was 10 pounds. Find the percent error.
20%
The ratio of an error to an accepted value
percent error
Density was calculated in an experiment and was found to be 86 g/cm3. The actual density was 78 g/cm3. What is the percent error?
10%
Arlo performs an experiment for his physical science class and finds that the gravitational acceleration due to the Earth is 9.0 m/s2. The actual value is 9.8 m/s2. What is the percent error in Arlo's measurement?
8.2 %
Calculate 5.50 cm + 5.50 cm and give your answer with the appropriate number of significant figures.
11.00 cm
Calculate 12.34 + 1.234 + 0.1234 and give your answer with the appropriate number of significant figures
13.70
Calculate 345.009 g - 23.009 g and give your answer with the appropriate number of significant figures
322.000 g
Calculate 7.987 m - 0.54 m and give your answer with the appropriate number of significant figures.
7.45 m
When performing the calculation 34.530 g + 12.1 g + 1222.34 g the final answer must have
one decimal place
Calculate 1.23 m x 0.89 m and give your answer with the appropriate number of significant figures.
1.1 m^2
Calculate 123000 m x 3234 m and give your answer with the appropriate number of significant figures.
3.98 x 10^8 m^2
Calculate 923 g ÷ 20312 cm^3 and give your answer with the appropriate number of significant figures.
0.0454 g/cm^3
Calculate 12.47 m ÷ 3.2 s and give your answer with the appropriate number of significant figures.
3.9 m/s
Calculate 0.020 cm x 50 cm x 11.1 cm and give your answer with the appropriate number of significant figures.
10 cm^3
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