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
nadezda [96]
3 years ago
15

Based on table N of the reference tables what is the number of hours required for 42k (potassium -42) to undergo three half-life

periods
Chemistry
1 answer:
skelet666 [1.2K]3 years ago
3 0

The number of hours required : 37.2 hours

<h3>Further explanation</h3>

Given

⁴²K (potassium -42)

Required

The number of hours

Solution

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually, radioactive elements have an unstable atomic nucleus.  

Based on Table N(attached), the half-life for ⁴²K is 12.4 hours, which means half of a sample of ⁴²K will decay in 12.4 hours

For three half-life periods :

\tt 3\times 12.4=37.2~hours

You might be interested in
What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2% oxygen?
notsponge [240]
The  empirical formula  for a compound   is KClO3

     Explanation 
 
find  the  moles of each  element
moles  = % composition/molar  mass

molar  mass of  of  potassium =39g/mol ,chlorine = 35.5 g/mol, oxygen =16 g/mol

moles  of potassium  =  31.9 / 39 = 0.818  moles
moles of  chlorine    = 28.9/35.5 = 0.814 moles
moles of   oxygen  =  39.2/  16 =  2.45  moles


find the  mole ratio  by  dividing   with  the smallest  mole = 0.814  moles

potassium = 0.818/0.814  =1  
chlorine  =  0.814/0.814 = 1
oxygen =  2.45 /0.814 =3 


the empirical  formula   is therefore = KClO3
7 0
3 years ago
Which of the following chemical reactions is balanced?
anyanavicka [17]

Answer:

a

Explanation:

3 0
3 years ago
Read 2 more answers
A golf ball has more mass than a tennis ball because it ?
dedylja [7]
Most tennis balls are usually hollow, while golf balls are not. Therefore a golf ball contains more mass.

Hope this helps!
3 0
3 years ago
Read 2 more answers
How many grams of sodium are needed to produce 12.5g of sodium oxide
Hatshy [7]

Answer:

25 possibly

Explanation:

I'm not too sure about this, but sodium oxide is Na2O, 2 sodium and 1 oxygen, so 12.5g * 2 is 25

If someone else comes up with a more convincing argument listen to them

4 0
3 years ago
Define Titanium and what it is used for
Kaylis [27]
Chemical element of atomic number 22, a hard silver-gray metal of the transition series, used in strong, light, corrosion-resistant alloys.<span>These alloys are mainly </span>used<span> in aircraft, spacecraft and missiles because of their low density and ability to withstand extremes of temperature.</span>
8 0
3 years ago
Other questions:
  • A diploid somatic ("body") cell has 2n = 20 chromosomes. At the end of mitosis, each daughter cell would have ______ chromosomes
    15·1 answer
  • Define the term valence electron and explain how to find the number of valence electrons in family one and family 2.
    11·1 answer
  • What happens to the volume when we INCREASE the pressure?
    8·1 answer
  • What are the sub-particles that make up an atom? (select all that apply) *?
    6·1 answer
  • What are the characteristics of a continental drift?
    5·1 answer
  • How many moles are there in 7.50 x 10^23 atoms of iron?
    10·1 answer
  • Many metals pack in cubic unit cells. The density of a metal and length of the unit cell can be used to determine the type for p
    7·1 answer
  • Question 1 of 10
    12·1 answer
  • I NEED HELP PLEASE, THANKS! BRAINLIEST :)
    5·2 answers
  • C + 2ZnO → CO2 + 2zn
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!