The elements in each column have ___________
Answers
Answer:
the same number of electrons in their outermost shells
Explanation:
On the periodic table, elements in the same column have the same number of electrons in their outermost shells (also known as valence electrons), and hence, are said to belong to the same group.
Similarly, elements on the same row in the periodic table have the same number of atomic orbitals and are said to belong to the same period.
The elements in each column have the same number of electrons in their outermost shells.
What is an element of a periodic table?
Elements are defined as the substances in chemistry that can not be broken down by any further chemical reaction.
Typical examples of elements include: oxygen, hydrogen,Helium, calcium, potassium, iron, Chlorine.
These elements are arranged in columns and the rows of the periodic table according to their atomic numbers.
The elements in each column have the same number of electrons in their outermost shells.
Learn more about atoms here:
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Which diatomic molecule is formed when thetwo atoms share six electrons? (1) H2 (2) N2 (3) O2 (4) F2
In which reaction will the point of equilibrium shift to the left when the pressure on the system is increased
Answers
If the volume goes up, the pressure goes down.
Answer:
0.87
Explanation:
(2) 3.0 grams of HCl per mole of solution
(3) 3.0 moles of HCl per liter of solution
(4) 3.0 moles of HCl per mole of water
Answers
Answer : The correct option is, (3) 3.0 moles of HCl per liter of solution
Explanation :
Molarity : It is defined as the number of moles of solute present in one liter of the solution. The S.I unit of molarity is mole per liter.
It is represented as,
where,
V = volume of solution in liter
As we are given 3.0 M HCl(aq) solution this means that 3.0 moles of HCl present in one liter of solution.
Hence, a 3.0 M HCl(aq) solution contains a total of 3.0 moles of HCl per liter of solution.
Answer (3)
hope this helps!
Answers
Answer: 7.6 g of water are required to make 12.6 g of glucose
Explanation:
Moles is calculated by using the formula:
The balanced chemical equation is:
According to stoichiometry:
1 mole of glucose is produced by = 6 moles of water
Thus 0.07 moles of glucose is produced by = moles of water
Mass of water required =
Thus 7.6 g of water are required to make 12.6 g of glucose
(2) increases
(3) remains the same
Answers
An electron in an atom moves from a ground state to an excited state when the electron energy increases
Further Explanation
Excitation in physics is the addition of a number of discrete energies (called excitation energies) to a system — such as the nucleus of an atom, atom, or molecule — so as to produce a change, usually from the lowest energy state (ground state) to one of the higher energies (excited state).
In nuclear, atomic and molecular systems, excited states do not continue to be distributed but instead have certain discrete energy values. Thus, external energy (excitation energy) can be absorbed in discrete quantities.
Excitation energy is stored in excited atoms and the nucleus that emits light is usually seen from atoms and as gamma radiation from the nucleus because they return to the ground state. This energy can also be lost by collisions.
In the nucleus, energy is absorbed by protons and neutrons which are transferred to an excited state. Within a molecule, energy is absorbed not only by electrons, which are very enthusiastic for higher energy levels but also by whole molecules, which are highly excited for the discrete states of vibration and rotation.
Learn More
Electron moves brainly.com/question/496960
Excitation brainly.com/question/496960
Details
Class: High School
Subject: Chemistry
Keywords: electron, excitation, energies
Answers
Answer:
The final solution will be clear and colorless.
Explanation:
The balanced reaction equation is:
NaOH + HCl ⇒ H₂O + NaCl
The amount of NaOH that is added is calculated as follows:
(20.0mL)(1.0mol/L) = 20 mmol NaOH
Similarly, the amount of HCl that is added is as follows:
(10.0mL)(1.0mol/L) = 10 mmol HCl
Since HCl and NaOH react in 1:1 proportions, the HCl is the limiting reaction. 10 mmmol of HCl will neutralize 10 mmol of NaOH, leaving 10 mmol of NaOH. The volume of the mixed solution is 30.0 mL, so the concentration of NaOH in the final solution is:
(10 mmol)/(30.0mL) = 0.3333 M NaOH
The pOH of the final solution is:
pOH = -log([OH⁻) = -log(0.3333) = 0.477
The pOH is related to the pH as follows:
pH = 14 - pOH = 14 - 0.477 = 13.5
At a pH of 13.5, phenolphthalein is colorless. The final solution will be observed as clear and colorless.