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miss Akunina [59]
3 years ago
5

Which statement is best described as a atom

Chemistry
1 answer:
myrzilka [38]3 years ago
6 0

a core of protons and neutrons surrounds by electrons

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3 years ago
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Provide 3 examples of substances that are mixtures and list the substances in them.
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2 years ago
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How many liters of h2 gas, collected over water at an atmospheric pressure of 752 mmhg and a temperature of 21.0°c, can be made
Shalnov [3]

The answer is V = 0.6 L


The explanation:


1- First we will get P (H) :


p (H) = p total - p (H2O)


= 752 mmHg - 18.65 mmHg


= 733 mmHg


= 733 mmHg X (1 atm / 760 atm) = 0.964 atm


2- then when the reaction equation is:


Zn(s)+2HCl(aq) -> H2(g)+ZnCl2(aq)


so, then 1 mole of Zn will produce 1 mole of H2.


so, we need to get first the mole of Zn:


mole Zn = mass / molar mass


= 1.566g / 65.38g/mol

= 0.02395mol


∴ 0.02395 mol of Zn will produce 0.02395 mol of H2


by using the ideal gas equation we can get the volume V :


when :


PV = nRT


when T is the temperature = 21 + 273 = 294 K


and R is the ideal gas constant = 0.0821 L atm /K mol


and n is the number of moles = 0.2395 mol


and P is the pressure = 0.964 atm


so, by substitution:


V = (0.02395 moles H2)(0.0821 L atm / K mole)(294 K) / (0.964 atm)


= 0.6 L

3 0
2 years ago
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Help please asap!!
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<span>Saturated hydrocarbon cannot bond with compounds anymore, where as unsaturated hydrocarbons can bond, as they contain double or triple bonds. When they bond, the double and triple bonds break and new separate single bonds are formed with hydrogens or any other external compounds</span>
8 0
3 years ago
Why aluminium is used to make aeroplanes​
liberstina [14]

Answer:

Aluminum (blended with small quantities of other metals) is used on most types of aircraft because it is lightweight and strong. Aluminum alloys don't corrode as readily as steel. It has also been used for the skin of some high-speed airplanes, because it holds its strength at higher temperatures better than aluminum.

HOPE THIS HELPED!!!!!!!!!XDDD

6 0
3 years ago
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