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vovangra [49]
3 years ago
5

A substance is tested and has a pH of 8.4. What would you classify it as?

Chemistry
2 answers:
Alona [7]3 years ago
8 0

Answer:

D.A weak base

Explanation:

The pH of a weak base falls somewhere between 7 and 10. Like weak acids, weak bases do not undergo complete dissociation; instead, their ionization is a two-way reaction with a definite equilibrium point. While strong bases release hydroxide ions via dissociation, weak bases generate hydroxide ions by reacting with water. Ammonia (NH3) and methylamine (CH3NH2) are examples of weak bases.

Leviafan [203]3 years ago
5 0

Answer:

D

Explanation:

7 is neutral on a PH scale. Anything less is an acid and anything higher is a base. A Ph scale goes from 1-13. 8.4-7=1.4. This is a small change so it is considered a weak base. Can I get brainliest?

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For each of the four single-displacement reactions, describe what happened in rachel well. if a chemical reaction occured, write
Ad libitum [116K]

Answer:

Explanation:

Single replacement:

It is the reaction in which one elements replace the other element in compound.

General equation:

AB + C → AC + B

1) zinc and Copper sulfate

Zn + CuSO₄   →   ZnSO₄ + Cu

Zinc is more reactive than copper it displaces the copper from copper sulfate and form zinc sulfate.

2) Aluminium and Copper sulfate

2Al + 3CuSO₄   →  Al₂(SO₄)₃ + 3Cu

Aluminium is more reactive than copper it displaces the copper from copper sulfate and form aluminium sulfate.

3) Zinc and silver nitrate

Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag

zinc is more reactive than silver it displaces the silver from silver nitrate and form zinc nitrate.

4) copper and silver nitrate

Cu + 2AgNO₃  → Cu(NO₃)₂ + 2Ag

copper is more reactive than silver it displaces the silver from silver nitrate and form copper nitrate.

4 0
3 years ago
Two electrons are found in the same atom. One has the quantum number set (3, 2, 0, +?), and the other has the quantum number set
Vilka [71]

D. Same energy level but different sublevel.

<h3>Explanation</h3>

There are four quantum numbers [1]:

  • <em>n</em><em>, </em>the principal quantum number,
  • <em>l</em>, the orbital angular momentum quantum number,
  • <em>m_l</em>, the magnetic quantum number, and
  • <em>m_s</em>, the electron spin quantum number.

As their names might suggest:

  • <em>n </em>determines the main energy level of an electron.
  • <em>l</em> determines the type of sublevel of an electron.
  • Each sublevel might contain more than one orbital. <em>m_l</em> gives the orbital of an electron.
  • Each orbital contains up to two electrons. <em>m_s</em> tells two electrons in the same orbital apart.<em> </em>

The two electrons in question come from the same atom. The question suggests that they have the same <em>n</em>, <em>m_l</em>, and <em>m_s</em>. As a result, both electrons are in main energy level <em>n</em> = 3. They share the same spin.

However, the two electrons differ in their value of <em>l</em>.

  • <em>l </em>= 2 for the first electron. It belongs to a <em>d</em> sublevel.
  • <em>l </em>= 1 for the second electron. It belongs to a <em>p</em> sublevel.
<h3>Reference</h3>

[1] Kamenko, Anastasiya, et. al, "Quantum Numbers", Physical & Theoretical Chemistry, Chemistry Libretexts, 24 Mar 2017.

7 0
4 years ago
Which of the following is true about elements?
Sophie [7]

C. Elements combine to form compounds in organisms and nonliving substances

Explanation:

Elements combine to form compounds in both living and non-living organisms.

  • Elements are distinct substances that cannot be split-up into simpler substances.
  • Elements are made up of only one kind of atoms
  • Elements are pure substances.
  • When elements combine, they form compounds.
  • Compounds are found in all matter.

Learn more:

Elements brainly.com/question/1781595

#learnwithBrainly

4 0
3 years ago
an auto of an element has 17 protons in its nucleus.a) write the electronic configuration of the atom.b)to what period and group
polet [3.4K]

Answer:

i hope it will help you

Explanation:

electronic configuration 1s²,2s,²2p^6,3s²3p^6,4s^1

as it has one electron in its valence shell so it is the member of group 1A(ALKALI METALS)  and the number of shells is 4 so it is in period 4

5 0
3 years ago
The southernmost point of india is _____
Oxana [17]

Answer:

<h2><em><u>(a) indra point</u></em></h2>

Explanation:

Indira point is the southern most point of India and is situated on great nicobar island in the nicobar island.

8 0
3 years ago
Read 2 more answers
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