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DENIUS [597]
3 years ago
8

Which one of these is NOT a sign of chemical change? *

Chemistry
1 answer:
Gekata [30.6K]3 years ago
3 0
I think it’s light
Have fun :)
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Which best characterizes a crystal
Pachacha [2.7K]
<h3><u>Answer;</u></h3>

A dense substance that is hard and incompressible

<h3><u>Explanation</u>;</h3>
  • <em><u>Crystals are solids that are made up of particles such as molecules, atoms or ions, </u></em>which are arrange in a highly ordered microscopic structure, forming a crystal lattice which extends in all directions.
  • Examples of crystals include<em><u> quartz,</u></em> that is made up of silicon (iV) oxide molecules that are arranged in a lattice,<u><em>table salt</em></u> is another example that is made up of sodium and chloride ions that are arranged in a lattice
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5 0
2 years ago
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As the O3 suggests, the Ozone molecule is made up of 3 Oxygen atoms.
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Does a spring tide always happen in the season of spring
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4 0
2 years ago
A chemist determined by measurements that 0.050 moles of aluminum participated in a chemical reaction. Calculate the mass of alu
Law Incorporation [45]

Answer:

13.5 g

Explanation:

This question is solved easily if we remember that the number of moles is obtained by dividing the mass into the atomic weight or molar mass depending if we are referring to elements or molecules.

Therefore, the mass of aluminum in the reaction will the 0.050 mol Al times the atomic weight of aluminum.

number of moles = n = mass of Al / Atomic Weight Al

⇒ mass Al = n x Atomic Weight Al = 0.050 mol x 27 g mol⁻¹

                                                         = 13.5 g

We have three significant figures in 0.050 and therefore we should have three significant figures in our answer.

           

8 0
3 years ago
Energy starts with the steam coming from the tea kettle. This is an example of thermal energy because there is heat. When the st
inn [45]

Answer:

A. Convection B. Conduction

Explanation:

I got it right

8 0
3 years ago
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