today we will:. learn about elements and compounds
TRANSCRIPT
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Today we will:
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Today we will:Learn about
Elements and Compounds.
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HOMEWORK:
Read section 3.4Answer questions 20-24 on page 76.
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An element is a pure substance that cannot be broken down by physical or chemical means.
Elements and Compounds
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An element is a pure substance that cannot be broken down by physical or chemical means.
Elements and Compounds
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A compound is two or more elements combined chemically.
Elements and Compounds
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A compound is two or more elements combined chemically.
Elements and Compounds
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Law of definite proportions:
Elements and Compounds
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Law of definite proportions:A compound always has the same elements in the same proportions by mass.
Elements and Compounds
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Law of multiple proportions:
Elements and Compounds
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Law of multiple proportions:Some elements combine in several different proportions, but always in ratios of small whole numbers.
Elements and Compounds
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Sample Problems
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% = x 100
Sample Problems
partwhole
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A 20.0g sample of sucrose contains:
8.44g Carbon1.30g Hydrogen10.26g Oxygen
What is the percent by mass of each element in the compound?
Sample Problems
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A 20.0g sample of sucrose contains:
8.44g Carbon1.30g Hydrogen10.26g Oxygen
What is the percent by mass of each element in the compound?
Sample Problems
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8.44g C
Sample Problems
1.30g H
10.26g O
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8.44g C 20 g
Sample Problems
1.30g H 20 g
10.26g O 20 g
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8.44g C 20 g
Sample Problems
1.30g H 20 g
10.26g O 20 g
x 100 %
x 100 %
x 100 %
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8.44g C 20 g
Sample Problems
1.30g H 20 g
10.26g O 20 g
x 100 % = 42.2 % C
x 100 %
x 100 %
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8.44g C 20 g
Sample Problems
1.30g H 20 g
10.26g O 20 g
x 100 % = 42.2 % C
x 100 % = 6.5 % H
x 100 %
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8.44g C 20 g
Sample Problems
1.30g H 20 g
10.26g O 20 g
x 100 % = 42.2 % C
x 100 % = 6.5 % H
x 100 % = 51.3 % O
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8.44g C 20 g
Sample Problems
1.30g H 20 g
10.26g O 20 g
x 100 % = 42.2 % C
x 100 % = 6.5 % H
x 100 % = 51.3 % O
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8.44g C 20 g
Sample Problems
1.30g H 20 g
10.26g O 20 g
x 100 % = 42.2 % C
x 100 % = 6.5 % H
x 100 % = 51.3 % O 100 %
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Two unknown compounds are tested. Compound I contains 64.20g of copper and 35.80g of chlorine. Compound II contains 47.27g of copper and 52.73g of chlorine. Are the compounds the same?
Sample Problems
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Two unknown compounds are tested. Compound I contains 64.20g of copper and 35.80g of chlorine. Compound II contains 47.27g of copper and 52.73g of chlorine. Are the compounds the same?
Sample Problems
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64.20g Cu35.80g Cl
47.27g Cu52.73g Cl
Sample Problems
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64.20g Cu35.80g Cl
47.27g Cu52.73g Cl
Sample Problems
=
=
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64.20g Cu35.80g Cl
47.27g Cu52.73g Cl
Sample Problems
= 1.793
=
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64.20g Cu35.80g Cl
47.27g Cu52.73g Cl
Sample Problems
= 1.793
= 0.8964
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64.20g Cu35.80g Cl
47.27g Cu52.73g Cl
Sample Problems
= 1.793
= 0.8964
=
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64.20g Cu35.80g Cl
47.27g Cu52.73g Cl
Sample Problems
= 1.793
= 0.8964
= 2
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HOMEWORK:
Read section 3.4Answer questions 20-24 on page 76
.