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Usimov [2.4K]
3 years ago
12

4Na+ O2 --> 2Na20 If 4 moles of Na react completely, how many moles of Na2O form?

Chemistry
1 answer:
docker41 [41]3 years ago
4 0

1.45 moles of Na2O produced

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How many moles of HBr are present in 250 ml of a 0.15 M HBr solution?
Fofino [41]

Answer:

0.0375 moles HBr

Explanation:

we are given;

  • Molarity of HBr solution as 0.15 M
  • Volume of the solution as 250 mL

We are required to determine the number of moles;

We need to know that;

Molarity = Moles ÷ Volume

Therefore;

Moles of HBr = Molarity of HBr solution × Volume of solution

Thus;

Moles of HBr = 0.15 M × 0.25 L

                      = 0.0375 Moles

Thus, the number of moles of HBr solute is 0.0375 moles

6 0
3 years ago
A substance is tested in a lab. It is found to maintain a unique shape and is a good conductor of electricity. If it is made up
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Answer is: solid.

There are five fundamental states of matter (gas, liquid, solid, plasma and Bose–Einstein condensate).

In solid, molecules are closely packed, stiff and do not changes of shape or volume. Solid object (for example iron) does not take on the shape of its container.

Liquids have definite volume, but no fixed shape.

Gases (for example nitrogen and neeon) not have definite volume and fixed shape, it depends on its container.

Plasma is a an ionised gas with highly electrical conductivity.

6 0
3 years ago
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From the list of substances, identify each as a strong acid, strong base, or neither a strong acid nor a strong base.
Dafna11 [192]

Answer:

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HCl is also a strong acid

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Ca(OH)3 is a strong base

Explanation:

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2 years ago
If you were asked to describe metals and magnetism you could say. A. non–paired electrons spin in opposite directions in all met
attashe74 [19]

Answer : Option D) the electrons in some metals pair up to create a magnetic field.


Explanation : Most of the metals are magnetic in nature including some exceptions. When the unpaired electrons get aligned with the magnetic field they posses magnetism. Also there are some paired electrons in metals which align themselves according to the magnetic field and create magnetism in them.

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3 years ago
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Identify the reaction type shown and describe the clues that were used to identify it.
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The type of reaction of Fe2O3 + 2SiO2 → Fe2Si2O7 would be that it is a synthesis reaction. It is a type of chemical reaction in which two or more simple substances combine to form a more complex product. Hope this answers the question.
4 0
2 years ago
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