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
mestny [16]
3 years ago
5

What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?

Chemistry
1 answer:
Elenna [48]3 years ago
5 0

Answer:

The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.

You might be interested in
If an atom or ion has an atomic number of 3, 2 electrons, and the electronic configuration is 2, what is the mass number? ​
rjkz [21]
It’s mass number would be 5 as it’s the protons and the neutrons added together
7 0
3 years ago
Im in the middle of a chem test and i literally have no clue what is happening
denis23 [38]

Answer:

No question so I'm just taking the points

5 0
3 years ago
Tron 200g dung dich NaCl 40% voi m gam dung dich NaCl 20% thu duoc dung dich NaCl 25% . tinh m
Sati [7]

Answer:cool

Explanation:radical dude

8 0
2 years ago
In substitution reactions, (CH3)3C-I reacts at the same rate with Br- and Cl- even though Br- is a more reactive nucleophile tha
Kamila [148]

Answer:

A. (CH3)3C-I reacts by SN1 mechanism whose rate is independent of nucleophile reactivity.

Explanation:

We must recall that (CH3)3C-I is a tertiary alkyl halide. Tertiary alkyl halides preferentially undergo substitution reaction via SN1 mechanism.

In SN1 mechanism, the rate of reaction depends solely on the concentration of the alkyl halide (unimolecular mechanism) and is independent of the concentration of the nucleophile. As a result of this, both Br^- and Cl^- react at the same rate.

5 0
3 years ago
Basilosaurus cetoides was a large mammal that existed 35 million years ago. It was 20 m long and had a large skull, incompletely
Korvikt [17]

Answer: hey so I’m taking the same test as you right now. I’m on that question and I searched it up and came on here. Would you mind telling me the answer?

Explanation:

5 0
2 years ago
Other questions:
  • Self explanatory what’s the answers ?
    13·1 answer
  • How many moles of carbon dioxide are produced from 8.73 moles of tristearin?​
    9·1 answer
  • Reactions eventually stop. What is generally the reason for this?
    12·1 answer
  • How can I calculate the mass percent of carbon, nitrogen and oxygen in acetamide, C2H5NO?
    12·1 answer
  • A lahar is a type of mudflow that occurs
    8·1 answer
  • Compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07% Write
    6·2 answers
  • Sand at a beach becomes very warm after being exposed to sunlight for many hours due to what type of heat transfer?
    13·2 answers
  • Help me with this please I need the answers ASAP
    12·1 answer
  • A 8.5-liter sample of a gas has 1.2 mole of the gas. If 0.65 mole of the gas is added, what is the final volume of the gas? Temp
    14·2 answers
  • In the chemical formula below, how many H atoms are present?<br> SNH4OH
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!