3 years ago

What are the differences between an element, a compound, a homogeneous mixture, and a heterogeneous mixture?

Chemistry

1 answer:

mylen [45]3 years ago

8 0

Answer:

Visibly different substances

Explanation:

A substance consisting one type of atom. heterogeneous mixture: A mixture that consists of visibly different substances or phases. homogeneous mixture: A mixture that has the same uniform appearance and composition throughout its mass.

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An atom of oxygen (atomic number 8) has a mass number of 17. How many neutrons are<br> in that atom?

ludmilkaskok [199]

<h2>Answer: # of neutrons = 9</h2>

<h3>Explanation:</h3>

# of neutrons = mass number - atomic number

= 17 - 8

= 9

<h3>∴ number of neutrons in an atom of oxygen of mass number 17, is 9.</h3>

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expeople1 [14]

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What volume of carbon dioxide is produced when 0.489 mol of calcium carbonate reacts completely according to the following react

Vilka [71]

Answer:

11.0L of carbon dioxide is produced

Explanation:

Balanced equation: $CaCO_{3}(s)\rightarrow CaO(s)+CO_{2}(g)$

According to balanced equation, 1 mol of $CaCO_{3}$ produces 1 mol of $CO_{2}$

So, 0.489 mol of $CaCO_{3}$ produces 0.489 mol of $CO_{2}$

Let's assume $CO_{2}$ behaves ideally.

So, $P_{CO_{2}}V_{CO_{2}}=n_{CO_{2}}RT$

where P is pressure, V is volume , n is number of moles, R is gas constant and T is temperature in kelvin

Plug-in all the values in the above equation-

$(1atm)\times V_{CO_{2}}=(0.489mol)\times (0.0821L.atm.mol^{-1}.K^{-1})\times (273K)$

or, $V_{CO_{2}}=11.0L$

So, 11.0L of carbon dioxide is produced

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