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GuDViN [60]
2 years ago
8

When a candle burns what changes are observed?

Chemistry
1 answer:
dexar [7]2 years ago
3 0

Answer:

it's state changes from solid to liquid

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Does the universe have air in it between the galxies in it
fenix001 [56]

Answer:

No it does not space does not have oxygen and air is caused by oxygen

hey but this was a really interesting question to ask tho

Explanation:

4 0
3 years ago
Metals tend to ________ electrons and form _______ ions.
masya89 [10]
<span>Metals tend to lose electrons and form electro-positive ions / cations.</span>
5 0
4 years ago
Use the term selectively permeable in a sentence
atroni [7]
Selectively Permeable means that some things can move across the cell membrane while others cannot.  
Here is a sentence: Because of the selectively permeable membrane, the germs were kept out while the food went in.
8 0
3 years ago
Magnesium chloride, MgCl2, is an important industrial chemical.
gavmur [86]

This problem is providing information about a reaction between magnesium and hydrochloric acid. However, the moles of the latter are required given 50 cm³ of a 0.2-M solution, making this problem more about the application of molarity. At the end, the answer turns out to be 0.01 mol.

<h3>Molarity:</h3>

In chemistry, we use units of concentration in order to represent the relative amounts of solute and solvent in a solution. More specifically, molarity relates the moles of the solute with the liters of solution according to:

M=\frac{n}{V}

Thus, since this problem asks for the moles of hydrochloric acid in 50 cm³ of a 0.2-M solution, we must first calculate the volume in liters with:

V=50cm^3*\frac{1L}{1000cm^3} =0.050L

To finally solve for n, moles, to obtain:

0.2mol/L=\frac{n}{0.05L} \\\\n=0.2mol/L*0.05L\\\\n=0.01mol

Learn more about molarity: brainly.com/question/9468209

8 0
3 years ago
Some chemical compounds are listed in the first column of the table below. Each compound is soluble in water. Imagine that a few
arsen [322]

Ionic substances produce ions in solution while molecular substances produce molecules in solution.

<h3>What is a solution?</h3>

A solution is a combination of solute and solvent. The species that occur in solution depends on the type of substance that was dissolved. Since the table is not shown, we do not know exactly what compounds were dissolved in solution.

Generally, if an ionic substance is dissolved in solutions that ions are present in the solution. If a molecular substance is dissolved in solution, molecules are present in solution.

Learn more about solution: brainly.com/question/7932885

5 0
2 years ago
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