All categories

3 years ago

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.

You might be interested in

If we reverse the reaction to read Z + W -> X + Y, the +deltaH would be a -delta H. Does this indicate that heat is given off

Gre4nikov [31]

Answer:

In this reaction heat is released

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 released

Exothermic 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.

5 0

3 years ago

2 main reasons why we have 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 amide groups. In this functional group, We have a nitrogen bond to hydrogen, so in this bond, we will have a dipole, due to the electronegativity difference. Nitrogen has more electronegativity than hydrogen, therefore a positive dipole would be generated in the hydrogen atom. Additionally, in the carbonyl group (C=O) due to the oxygen, we will have also a dipole, in this case, a negative dipole because the oxygen atom has more electronegativity (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 "hydrogen bonds".

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

Read 2 more answers