2 years ago

Please do for 30 points its due today. ( if you waste my points i will report.)

Chemistry

1 answer:

finlep [7]2 years ago

5 0

Answer:

Sorry ill put an answer if this is wrong but your asking if its good right?

OK I like it you have really neat hand righting and everything seems organized very well I think you should pass on this its very nice!

Explanation:

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ddd [48]

Honestly I don’t even know

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3 years ago

12.A piece of magnesium is in the shape of a cylinder with a height of 5.62 cm

yaroslaw [1]

Answer:

Density, d = 1.779 g/cm³

Explanation:

The density of a material is given by its mass per unit volume.

Here, height of a piece of magnesium cylinder, h = 5.62 cm

Its diameter, d = 1.34 cm

Radius = 0.67 cm

Volume of he cylinder,

$V=\pi r^2 h\\\\\text{Putting the value of r and h, we get :}\\\\V=(\pi \times (0.67)^2\times 5.62)\ cm^3$

$d=\dfrac{m}{V}\\\\d=\dfrac{14.1\ g}{(\pi \times (0.67)^2\times 5.62)\ cm^3}\\\\d=1.779\ g/cm^3$

So, the density of the sample is 1.779 g/cm³.

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3 years ago

How many bonded pairs of electrons are there in the molecule H2CO?

Drupady [299]

There are eight bonded electrons in this molecule! :)

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3 years ago

Which of the following is an irreversible physical change?

Yuliya22 [10]

Answer:

b) sharpening a pencil

Explanation:

If you melt lead, boil water, or dissolve sugar in water, you can return all of them back to their original state. If you sharpen a pencil, you can't reattach the shavings as they were originally.

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3 years ago

Someone please help me with number 5. no idea what it is.

KATRIN_1 [288]

Answer is Sodium Hydroxide.

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3 years ago