CHEMISTRY MIDDLE SCHOOL

What is a valence electron and why are they so important to a chemist?

Answers

Answer 1
Answer:

Valence electrons are the electrons that reside in an atom's outermost shell. The role of valence electrons in determining an atom's reaction makes them crucial. You can count how many electrons are at the highest energy level by writing an electron configuration.

How do the valence electrons function?

The electrons in an atom's outermost shell are called valence electrons. … Because the electrons in the outermost shells of two atoms are the first to come into contact with one another and are the ones that control how an atom will react in a chemical reaction, when two atoms interact.

The outer-shell electrons of an atom are known as valence electrons. The valence electrons in an atom control its reactivity.

To learn more about Valence electron refer to:

brainly.com/question/371590

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Answer 2
Answer: They are important because they are the electrons that help the atom to bond with another atom. They are in the outer most shell. ☺️

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In this reaction, how many grams of O2 are required to completely react with 110 grams of Al

Answers

You'd need
33.6 g
of aluminium to react with that much manganese dioxide.
So, you've got your balanced chemical equation for this reaction
3
M
n
O
2
(
s
)
+
4
A
l
(
s
)
→
3
M
n
(
s
)
+
2
A
l
2
O
3
(
s
)

The mole ratio that exists between manganese dioxide and aluminium is simply the ration between the stoichiometric coefficients placed in front of them.
In your case, the balanced chemical equation shows that you have 3 moles of manganese dioxide reacting with 4 moles of aluminium; this means that your mole ratio will be
3:4
.
Likewise, the mole ratio between aluminium and manganese dioxide will be
4:3

→
4 moles of the former need 3 moles of the latter.
You can put this mole ratio to good use by determining how many moles of aluminium are needed to react with the number of moles of manganese dioxide present in 81.2 g. So,
81.2 g MnO
2
⋅
1 mole
86.94 g
=
0.9340 moles

M
n
O
2

This means that you'll need
0.934 moles
M
n
O
2
⋅
4 moles Al
3 moles
M
n
O
2
=
1.245 moles Al
To determine the number of grams needed to get that many moles use aluminium's molar mass
1.245 moles Al
⋅
26.98 g
1 mole Al
=
33.59 g Al

Rounded to three sig figs, the answer will be
m
aluminium
=
33.6 g

Why are there three seismography​

Answers

This is needed to triangulate,

assuming accurately synchronized arrival times of the shock waves.

Hope this helps a bit :)

The melting point of table salt is 801 degrees celsius. is this a physical or chemical property?

Answers

It is a Physical property because like water it changes into a ice cube but it can be melted into water or be turned back into an ice cube.

What conclusion can be drawn from the statement that an element has a high ionization energy and small atomic size?A) The element is most likely from Group 1A or 2A and in period 1 or 2

B) The element is most likely from Group 2A or 3A and in period 2 or 3.

C) The element is most likely from Group 4A or 5A and in period 4 or 5.

D) The element is most likely from Group 6A or 7A and in period 6 or 7​

Answers

Answer:

The list of answer choices is wrong.

The correct list is:

A) The element is most likely from Group 1A or 2A and in period 1 or 2.

B) The element is most likely from Group 2A or 3A and in period 6 or 7.

C) The element is most likely from Group 4A or 5A and in period 4 or 5.

D) The element is most likely from Group 6A or 7A and in period 2 or 3.

The correct answer is:

  • Option D) The element is most likely from Group 6A or 7A and in period 2 or 3.

Explanation:

The ionization energy increases from left to right on the periodic table. So the elements with higer ionization energies are in the right end of the table. The right most columns are 6A (16) and 7A(17). The column 8A (18) which is that of the noble gases is not normally taken into acccount for this predictions because noble gases are nearly inert.

Hence, the fact that the statement indicates high ionization energy suggests that the element is most likely from group 6A or 7A.

The atomic radius increases from top to bottom, so the smallest elements are in the top rows, which is the periods 1, 2, or 3. The period 1 only has two elements, hydrogen in group 1 and helium in group 8A, so they are not considered in the choices. Thus, that leaves you with the periods 2 or 3.

Adding the two considerations, the conclusion is that the element is most likely from group 6A or 7A and in period 2 or 3.

Answer:

Explanation:

The answer is A) The element is most likely from Group 1A or 2A and in period 1 or 2

How Fast Do Different Parts Of The EM Spectrum Travel In A Vacuum?

Answers

All electromagnetic waves travel at light speed, so they all travel the same speed.

List three evidences of physical and chemical change. ( If you know only one or two please write them anyways please)

Answers

Physical: ripping paper, braking a stick, cake batter mixing

Chemical: burning paper, spoiled milk, a penny turning green
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