1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mojhsa [17]
3 years ago
13

What part of an original isotope’s number of atoms remains have two half-lives?

Chemistry
1 answer:
KIM [24]3 years ago
3 0
After two half-lives, one fourth of the original isotope’s atom remain.
You might be interested in
Would you expect the Mg3[Cr(CN)6]2 to be diamagnetic or paramagnetic? Explain your reasoning.
bixtya [17]

Answer:

paramagnetic

Explanation:

The complex ion is : [Cr(CN)₆]³⁻

Oxidation state of Cr in [Cr(CN)₆]³⁻ is:

x + (-1)6 = -3

x = +3

CN⁻ is a strong field ligand which can result in  pairing of the electrons.

The electronic configuration of Cr is:

1s²2s²2p⁶3s²3p⁶3d⁵4s¹

The electronic configuration of Cr³⁺ is:

1s²2s²2p⁶3s²3p⁶3d³

<u>These 3 electrons will be singly present in the 3 degenerate t₂g orbitals and per Hund's rule, pairing will not occur in the same level energy orbitals. So , no. of unpaired electrons will be 3 and the complex will be paramagnetic.</u>

5 0
3 years ago
How many atoms of lead are in 3.25 moles of lead
musickatia [10]

Answer: 1.96x10^24 atoms

Explanation:

3.25*6.02214076*10^23 atoms = 1.96x10^24

6 0
2 years ago
A scientist is working in a lab and accidentally combines two liquids that quickly form a solution. Which process could be used
PIT_PIT [208]

Answer:

Distillation

Explanation:

The method of distillation can be used to separate the two liquids, if their boiling point is known. The liquid with lower boiling point will be evaporated and its vapours will be captured, while the liquid with higher boiling point will remail in the container in the liquid state.

7 0
2 years ago
What is a device that changes electrical energy into mechanical energy?
umka2103 [35]
<span>A generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy.</span>
8 0
3 years ago
What type of reaction is Pb(NO3)2 (aq) + 2KI (aq) →PbI2 + 2KNO3 (aq)
kifflom [539]

Answer:

Precipitation Reactions

They contain two aqueous reactants, one aqueous product, and one solid product. In this reaction, two soluble products, Pb(NO3)2 and KI, combine to form one soluble product, KNO3, and one insoluble product, PbI2. This is a precipitation reaction, and PbI2 is the precipitate.

4 0
2 years ago
Other questions:
  • A substance which melts/boils at a fixed temperature is a pure substance.<br><br> True<br> False
    6·2 answers
  • In what type of solids are the particles not arranged in a regular pattern
    8·1 answer
  • The formula for the ammonium ion
    12·2 answers
  • What word is used synonymously with the word "base"
    7·1 answer
  • What is formed from a metal and a non-metal
    10·1 answer
  • Describe one everyday situation in which it would be useful to identify an unknown substance
    9·1 answer
  • State the 4 major ideas of Dalton's Atomic Theory.
    9·1 answer
  • In this equilibrium, hydroxide ion acts as a A) Lewis base B) Bronsted base C) both A &amp; B D) neither A or B
    12·1 answer
  • 2LiClO+KHSO - Li2SO4 + Cl2 + KOOH
    7·1 answer
  • A sample of limestone (calcium carbonate, CaCO3) is heated at 950 K until it is completely converted to calcium oxide (CaO) and
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!