Consider this reaction: NH + + HPO 4 + NH3 + H2PO4

Indicate the type of observation that is best represented by the figures below.

Norma-Jean [14]

Qualitative because it changed its colour not its quantity :)

5 0

3 years ago

Which solid conducts electricity most efficiently?

irina1246 [14]

We see that is the <em>structure </em>of graphite it possess these attributes.

Graphite

Option A

<h3>Electricity</h3>

Generally, he conduction of electricity is do by elements with free talent electron after bonding.

Therefore, it is save to say that the <em>solid </em>that possess the attributes that allows for conduction will end up conducting.

Hence, we see that is the <em>structure </em>of graphite it possess these attributes.

Graphite

Option A

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4 0

2 years ago

A 20.0 % by mass solution of phosphoric acid (H3PO4) in water has a density of 1.114 g/mL at 20°C. What is the molarity of this

bogdanovich [222]

Assume you have 1 L of the material (you can assume any volume you want, you'll get the same answer).

<span>Using the density, the one L has a mass of 1114 g </span>

<span>20% by mass of phosphoric acid means the mass of phosphoric acid is 0.20 * 1114 g </span>

<span>Calculate the moles of phosphoric acid </span>

<span>Molarity, M, mole / L = moles of acid / volume or 1 L</span>

3 0

3 years ago

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How is helium, which is produced by the conversion of hydrogen into energy, related to the solar core?

Galina-37 [17]

The answer is C) <span>Helium forms the solar core, which continually increases in size.
When the hydrogen is </span><span>produced by the conversion and made into Helium the core contains the helium as well as producing it. Which in turn continually increases the size of the solar core.</span>

8 0

3 years ago

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Assign an oxidation number to each element in the reaction. co(g) 2h2(g) → ch3oh(g) in co, the oxidation number of c is , and th

Andrei [34K]

The oxidation state is the number of electrons gained and donated. The oxidation state of C is +2, O is -2, H is 0, and in methanol, C is +1, H is +1, and O is -2.

<h3>What is the oxidation number?</h3>

The oxidation number denotes the number of electrons donated and gained after the bond formation. In general, the oxidation state of free elements is zero, and of hydrogen when the bond to non-metal is +1 and with metals is -1.

The chemical reaction is given as,

$\rm CO + 2H_{2} \rightarrow CH_{3}OH$

Here,

The oxidation number of carbon in carbon monoxide will be +2, and oxygen will be -2.

The oxidation number of hydrogen in dihydrogen will be zero, and in methanol, the oxidation number of carbon will be +1, hydrogen will be +1 and oxygen will be -2.

Therefore, the oxidation number of oxygen is -2 most of the time.

Learn more about oxidation numbers here:

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7 0

2 years ago