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masha68 [24]
3 years ago
8

A piece of wood is measured to have 2 cm x 5 cm x 3 cm of volume.  Its mass is 20.0 g.  What is its density?

Physics
1 answer:
LenKa [72]3 years ago
8 0

Answer:

\boxed {\tt \frac{2}{3} \ or \ 0.666666667 \ g/cm^3}

Explanation:

Density can be found by dividing the mass by the volume.

d=\frac{m}{v}

The mass is 20 grams.

We have to find the volume.

  • To find the volume, multiply the length by the width by the height.
  • V= l*w*h
  • l= 2 cm, w= 5 cm, h= 3 cm
  • V= 2 cm * 5 cm * 3 cm =<u> 30 cm³</u>

<u />m= 20 \ g\\v= 30 \ cm^3<u />

Substitute the values into the formula.

d=\frac{20 \ g}{30 \ cm^3}

Divide.

d=\frac{2}{3} \ g/cm^3

d= 0.666666667 \ g/cm^3

The density is 2/3 grams per cubic centimeter.

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➷ Use this equation:

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This transformation is defined as chemical reaction.


During chemical reactions some chemical bonds  are broken and others are formed leading to the formation of one or more different substances called products.


Some examples of chemical properties are: reactivity with oxygen, reactivity with water, acidity, basicity, oxidation, reduction. The only way to tell if a substance has certain chemical property is by letting it react and so observe the change of the original substance into one or more different substances.

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