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shusha [124]
2 years ago
7

Why does a biker have to peddle harder to travel at a constant speed into the

Chemistry
1 answer:
Anna35 [415]2 years ago
7 0

Answer:

wind has resistance, 10 mph of wind has more than 0 mph

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Use the drop-down menus to label each of the following changes P for physical change and C for the chemical change. The substanc
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Chemical, Physical, Chemical, Chemical, Physical!!

Explanation:

I just did it correctly.

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All compounds are molecules but not all molecules are compounds. Explain this statement.
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All compounds are molecules because a molecule is 2 or more substances/elements combined and a compound is 2 or more elements combined. But not all molecules are elements because some molecules are just combined substances with no elements combined at all.
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Question 5(Multiple Choice Worth 5 points)
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Density

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At which position is the northern hemisphere experiencing winter?
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Point A

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#1: The element that loses electrons in a chemical reaction is said to have been which of the following?
Mrrafil [7]
#1: The element that loses electrons in a chemical reaction is said to have been which of the following? A. reduced

B. oxidized

C. combusted

D. rusted

**idk, is it reduced or oxidized??

Answer: oxidized. The element that loses electrons increases its oxidation number (becomes more positve or less negative) and this is oxidation.


Which type of reaction occurs if one element gains electrons and another loses electrons?

A. combustion

B. synthesis

C. oxidation-reduction

D. double-displacement

**my answer: C

Yes, oxidation-reduction

#3: What is the oxidation number for phosphorus in H4P2O7?

A. +5

B. +3

C. +1

D. - 1

**my answer: A. +5

This is the way to calculate it 4(+1) + 2x + 7(-2) = 0 => x = +5



#4: What is the oxidation number for phosphorus in Na2HPO3?

A. +5

B. +3

C. +1

D. - 1

**my answer; B. +3

is that right??

Right

2(+1) + 1 + x + 3(-2) = 0 => x = 6 -1 -2 = 3 (positive)
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