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Sliva [168]
3 years ago
7

A new penny has a mass of 2.49 g and a volume of 0.349 cm3. Is the penny made of pure copper?

Chemistry
1 answer:
velikii [3]3 years ago
7 0
Yes it is. Copper is the same mass and volume. Plus all pennies are made of copper
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If a gold bar is 16,000 g mass and 800 cm^3 volume what is the density?
ki77a [65]

Answer:

<h3>The answer is 20 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question

mass = 16,000 g

volume = 800 cm³

We have

density =  \frac{16000}{800}  =  \frac{160}{8}  \\

We have the final answer as

<h3>20 g/cm³</h3>

Hope this helps you

5 0
3 years ago
Which of the following is true for balancing equations?
nataly862011 [7]

Answer:

D) There must be equal number of atoms of each elements on both sides of equation.

Explanation:

The balancing equation must have equal number of atoms of each elements on both sides of equation.

The balance equation shoes mass is conserved thus followed the law of conservation of mas.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

8 0
3 years ago
How to prepared sodium chloride solution in the laboratory.​
Afina-wow [57]

hope it will help you

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hope it will helps

5 0
2 years ago
That's how you can
kirza4 [7]
2)8/8-9_12-/78)022-/7/$
6 0
3 years ago
Hersey chocolate company makes 80 million kisses daily how many chocolate kisses are made per second
Scrat [10]

Answer:

92.5925925926

Explanation:

8 million divided by the seconds in a day witch is 86400

7 0
3 years ago
Read 2 more answers
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