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AlexFokin [52]
3 years ago
14

Hi i need help. Select all the statements that are true.

Chemistry
2 answers:
motikmotik3 years ago
7 0

Answer:

A, C, E

Explanation:

hope this helps

Lilit [14]3 years ago
6 0

Answer:

A, C, E

Explanation:

sfdghjksgasjdsvjhkjvsdf

HOPE YOU GET THIS RIGHT!!!:)))))

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How many kilograms of solvent (water) must 0.71 moles of KI be dissolved in to produce a 1.93 m solution?
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Explanation:

Use the molality formula.

M= m/kg

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Which option is a valid hypothesis in the correct format?
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Answer:

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Hypotheses are written in the format of "If... then...". It should include information on both variables to arrive at a conclusion point.

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An astronaut weighs 104 newtons on the moon,where the strength of gravity is 1.6 newtons per kilogram
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3 years ago
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Plzzzzzzz help meeeeeeee
aliina [53]

Answer:

because one is going into your mouth and the other you feel with your hand.

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3 years ago
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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

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is that right??

Right

2(+1) + 1 + x + 3(-2) = 0 => x = 6 -1 -2 = 3 (positive)
5 0
3 years ago
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