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Elina [12.6K]
3 years ago
5

Heliocentric theory:

Chemistry
1 answer:
Juliette [100K]3 years ago
7 0
All of th above support the heliocentric theory.
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The monomer of poly(vinyl chloride) has the formula C2H3Cl. If there are 1,565 repeat units in a single chain of the polymer, wh
monitta

Answer:

\large \boxed{9.780 \times 10^{4}\text{ u}}

Explanation:

The molecular mass of a monomer unit is:

C₂H₃Cl = 2×12.01 + 3×1.008 + 35.45 = 24.02 + 3.024 + 35.45 = 62.494 u

For 1565 units,

\text{Molecular mass} = \text{1565 units} \times \dfrac{\text{62.494 u}}{\text{1 unit }} = \mathbf{9.780 \times 10^{4}}\textbf{ u}\\\\\text{The molecular mass of the chain is $\large \boxed{\mathbf{9.780 \times 10^{4}}\textbf{ u}}$}

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2 years ago
Hydrofluoric acid is used to etch grooves in glass because it reacts with the silica (sio2(s)) in glass. the products of the rea
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Answer is: coefficient is one.
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Reaction is balanced when there are equal numbers of elements in both side of the chemical reaction.
HF - hydrofluoric acid, <span>highly corrosive, dissolves many materials.</span>
SiF₄ - silicon tetrafluoride.
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3 years ago
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Kendra conducts an experiment. She mixes two chemicals, resulting in a chemical reaction. Based on Kendra's
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Answer: It changed in identity and properties.

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True or False to show whether you think each statement is true
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1.T

2.F

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I think I think Im not complety sure sorry
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2 years ago
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