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Section 4: Elements and Compounds

Elements and Compounds

1.
Sucrose is composed of carbon, hydrogen, and oxygen. Which of the following data is not needed in order to determine the percent by mass of the three elements?

Analysis Data of Two Copper Compounds
Compound
% Cu
% Cl
Mass copper (g)100.0 g
of compound
Mass chlorine (g) 100.0 g
of compound

Mass ratio

mass Cu
————
mass Cl

I
64.20
35.80
64.20
35.80
1.793 g Cu/1 g Cl
II
47.27
52.73
47.27
52.73
0.8964 g Cu/1 g Cl


A)mass of carbon in sucrose sample
B)mass of hydrogen in sucrose sample
C)total mass of the sucrose sample
D)atomic numbers of the elements
2.
Which of the following is a compound?
A)water
B)neon
C)steel
D)crude oil
3.
A material that cannot be broken down further by chemical means is a(n) ________.
A)substance
B)element
C)mixture
D)compound
4.
Periods are ___________ on the periodic table.
A)horizontal rows
B)vertical columns
C)left to right diagonals
D)right to left diagonals
5.
Elements on the left side of the periodic table are _______.
A)nonmetals
B)metalloids
C)metals
D)compounds
6.
Fe2O3 is a(n) _____________.
A)compound
B)element
C)heterogeneous mixture
D)homogeneous mixture
7.
What is the percent by mass of the components of water?
A)11% H, 89% O
B)89% H, 11% O
C)67% H, 33% O
D)33% H, 67% O
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