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OleMash [197]
3 years ago
13

Which statement correctly describes a chemical reaction?

Chemistry
1 answer:
Trava [24]3 years ago
6 0
The correct answer is C
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What is the difference in mean solar time between 30 N 75 W and 30 N 90 W​
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Every 15 degrees is an hour

Explanation:

What is the time difference in mean solar time between 30° N 75° W and 30° N 90° W?

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2 years ago
Given:
bulgar [2K]

Answer:

The combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

Explanation:

Given;

CH₄ + 2O₂ → CO₂ + 2H₂O, ΔH = -890 kJ/mol

From the combustion reaction above, it can be observed that;

1 mole of methane (CH₄) released 890 kilojoules of energy.

Now, we convert 59.7 grams of methane to moles

CH₄ = 12 + (1x4) = 16 g/mol

59.7 g of CH₄ = \frac{59.7}{16} = 3.73125 \ moles

1 mole of methane (CH₄) released 890 kilojoules of energy

3.73125 moles of methane (CH₄) will release ?

= 3.73125 moles x  -890 kJ/mol

= -3320.81 kJ

Therefore, the combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

5 0
3 years ago
As the pendulum moves from point 2 to point 3, what happens to its mechanical energy?potential energy is converted to kinetic en
ahrayia [7]

Answer: Potential energy is converted to kinetic energy and back again.

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3 0
3 years ago
Please help! brainliest, rattings, thanks, etc.
pochemuha

According to Newton's first law of motion, it takes an unbalanced force to move an object at rest.

I hope this helps :)

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3 years ago
An oxide ion, O2–, has:
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6 0
2 years ago
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