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3 years ago

Why is it easy to float on salt water instead of fresh water?

1 answer:

5 0

Answer:
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Because salt water is denser than freshwater.
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Gravity on Earth is 9.8 m/s2, and gravity on Jupiter is 23.1 m/s2.

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The weight on Earth is 686 newtons and its weight on Jupiter is 1617 newtons.

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What is a safety guide line?

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Answer:

A safety guide lines are rules and regulations that are made to make sure place is safe and conducive for everyone.

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3 years ago

What particle will balance the following nuclear equation?

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Why has nobody answered this yet

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In an experiment, a student made a compund of sulfur and copper, and now she needs to find if the compound is copper (I) sulfide

finlep [7]

Answer: The formula for the given compound is $Cu_2S$

Explanation:

An ionic compound is defined as the compound which is formed when electron gets transferred from one atom to another atom. These are usually formed when a metal reacts with a non-metal.

The chemical formula of copper (I) sulfide is $Cu_2S$ because this is formed by the combination of $Cu^+$ ions and $S^{2-}$ ions

The chemical formula of copper (II) sulfide is $CuS$ because this is formed by the combination of $Cu^{2+}$ ions and $S^{2-}$ ions

To calculate the percent composition of element in a compound, we use the equation:

$\text{Percent composition of element}=\frac{\text{Mass of element}}{\text{Mass of compound}}\times 100$ ...........(1)

For copper (I) sulfide:

Mass of copper = (2 × 63.546) = 127.092 g/mol

Mass of copper (I) sulfide = 159.16 g/mol

Putting values in equation 1, we get:

$\text{Percent composition of copper in }Cu_2S=\frac{127.092g}{159.16g}=79.85\%$

For copper (II) sulfide:

Mass of copper = 63.546 g/mol

Mass of copper (II) sulfide = 95.611 g/mol

Putting values in equation 1, we get:

$\text{Percent composition of copper in CuS}=\frac{63.546g}{95.611g}=66.46\%$

Given compound:

Mass of copper in given compound = 0.8383 grams

Mass of given compound = 1.0440 grams

Putting values in equation 1, we get:

$\text{Percent composition of copper in given compound}=\frac{0.8383g}{1.044g}=80.29\%$

The percent composition of copper is close to the composition in copper (I) sulfide.

Hence, the formula for the given compound is $Cu_2S$

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3 years ago

Choose any electromagnetic wave we have discussed and write ONE PARAGRAPH telling me about the uses/benefits of that electromagn

andrew11 [14]

Answer:

Visible Light

Explanation:

It helps us see things around us!

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