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bearhunter [10]
3 years ago
12

Which statement describes how chemical formula such as H20 represent compounds check all that apply

Chemistry
1 answer:
Allisa [31]3 years ago
8 0
<h3>Answer:</h3>
  • They show the elements of make up a compound
  • They show the types of atoms that make up a molecule
  • They show the number of each type of atom in a molecule
<h3>Explanation:</h3>

To answer this question we need to know what is a compound.

  • A compound is a substance that is made by two or more atoms of different elements that are chemically combined.
  • A chemical formula of a compound is a formula that shows the elements that make up a compound and also the types of atoms that make up the molecule.
  • Additionally, the chemical formula shows the number of each type of atom in a molecule.
  • In this case, the chemical formula of a molecule of H₂O shows that it is made up of one hydrogen atom and two oxygen atoms.

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If we reverse the reaction to read Z + W -&gt; X + Y, the +deltaH would be a -delta H. Does this indicate that heat is given off
Gre4nikov [31]

Answer:

<u>In this reaction heat is released</u>

Explanation:

Exothemic Reactions : Those reactions in which heat is released when the products are  formed .

For such reaction The enthalpy change is negative.

\Delta H= - for exothermic reaction

Endothermic Reactions : Those reaction which proceed by absorbing heat . Here heat is absorbed. The enthalpy change for such reactions is positive.

\Delta H= +

When the direction of reaction reverses , the value of H also changes.

In the given reaction,

X + Y\rightarrow Z +Q

\Delta H= +  = heat is absorbed

So,

Z+Q\rightarrow X+Y

\Delta H= - = heat is<u> released</u>

<u></u>

<u>E</u><em>xothermic reactions are more spontaneous as compared to endothermic ractions. This means that they  proceed own their own . Only little amount of energy is supplied to exothermic reaction to produce the prodct.</em>

5 0
3 years ago
2 main reasons why we have<br> seasons.
Ket [755]

Answer:

Tilt of a planet's axis and its orbit around the sun.

Explanation:

hope this helps! :)

3 0
2 years ago
Hydrogen bonding between polyamide chains plays an important role in determining the properties of a nylon such as nylon 6,6. Dr
Eduardwww [97]

Answer:

See figure 1

Explanation:

In the structure of nylon 6,6 we have <u>amide groups</u>. In this functional group, We have a nitrogen bond to hydrogen, so in this bond, we will have a <u>dipole</u>, due to the <u>electronegativity difference</u>. Nitrogen has more electronegativity than hydrogen, therefore a <u>positive dipole</u> would be generated in the hydrogen atom. Additionally, in the <u>carbonyl group</u> (C=O) due to the oxygen, we will have also a <u>dipole</u>, in this case, a <u>negative dipole</u> because the oxygen atom has <u>more electronegativity</u> (compare with carbon).

When we put two strings of nylon 6,6 the positive dipole will interact with the negative dipole and vice-versa and we will obtain the <u>"hydrogen bonds"</u>.

See figure 1

I hope it helps!

3 0
3 years ago
What is a proper adjective?
Alex17521 [72]
This is what a proper adjective is.

7 0
3 years ago
PLEASE ANSWER THIS QUESTION ASAP 50 POINTS
quester [9]

Answer:

A very large amount of energy is produced from a series of chemical reactions.

Explanation:

Nuclear fission is the process of splitting apart nuclei (usually large nuclei). When large nuclei, such as uranium-235, fissions, energy is released. So much energy is released that there is a measurable decrease in mass, from the mass-energy equivalence. This means that some of the mass is converted to energy.

4 0
3 years ago
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