Which statements about gravity are true

Chemistry

1 answer:

Katen [24]3 years ago

7 0

Answer:

1.gravity helps us stay situated on earth without floating away

3.gravity holds our galaxy together

4.multiplying the mass of an object by the acceleration due to gravity gives the weight of the object

Explanation:

Man can float on moon. This is because the force of gravity on the moon is less than that on Earth. Thus gravity helps us not float away on Earth.

All matter contains mass and has nothing to do with gravity. Option 2 is incorrect.

Gravity is a collection of billions of stars that are held together by gravity. Option 3 is correct.

Weight of the object is the product of the mass of an object and the acceleration due to gravity. Option 4 is correct.

Scientists launch space craft out of earths atmosphere against Earth's gravity. Option 5 is incorrect.

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Explanation:

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The half reaction of an oxidation reduction reaction shows that iron gains electrons. what does this electron gain mean for iron

chubhunter [2.5K]

Answer: The correct option is C.

Explanation:

Oxidation reactions are a type of chemical reactions in which a substance looses electrons and forms positive charge. The substance undergoing this reaction is being oxidized.

$A\rightarrow A^++e^-$

Reduction reactions are a type of chemical reactions in which a substance gains electrons and forms negative charge. The substance undergoing this reaction is being reduced.

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