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
adoni [48]
3 years ago
5

A certain radioactive element has a half-life of one hour. If you start with 40.0 grams of the element at noon, how much of the

radioactive element will be left at 2 p.m.?
A.) 20.0 grams
B.) 10.0 grams
C.) 5.0 grams
D.) 0.0 grams
Chemistry
2 answers:
Tpy6a [65]3 years ago
5 0

If you start with 40.0 grams of the element at noon, 10.0 grams radioactive element will be left at 2 p.m. The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

olganol [36]3 years ago
5 0

Answer:

B) 10.0 g

Explanation:

<u>Given data:</u>

Half life of the radioactive element = t1/2 = 1 hr

Initial amount, N0 = 40.0 g

Time for radioactive decay. t = 2 hr (12 noon  to 2 P.M)

<u>Formula:</u>

The radioactive decay is expressed mathematically as:

N(t) = N(0)e^{\frac{-0.693t}{t1/2} }

where N(t) is the amount of the element left after time t

Substituting the appropriate vales in the above equation we get:

N(t) = 40.0 * e^{\frac{-0.693*2}{1} } = 10.0 g

You might be interested in
3.1
stich3 [128]

Answer:

C3H8 +5O2 arrow 3CO2 +4H2O

4 0
3 years ago
The general equation for an acid base reaction looks lik:
pickupchik [31]

Answer

B. acid + base --> salt + water

Explanation

Acids are substances that dissolve in water to produce hydrogen ions, H+.A base is a substance that dissolves in water to produce hydroxide ions, OH-.In a chemical reaction of an acid and a base, the products are a salt and water.For example when hydrocholoric acid is added to sodium hydroxide, a salt namely sodium chloride is formed with additional water.


6 0
3 years ago
Read 2 more answers
What do you think is happening at the nanoscale that keeps the salad dressing with an emulsifier mixed?
saveliy_v [14]

Answer:

✨ science ✨ and ✨ big brain stuff ✨

Explanation:

sorry

4 0
2 years ago
You can be electrocuted if you try to use water to put out a class_ fire ?
olganol [36]
I think class C. fire
4 0
3 years ago
Hellppppppppplplllppp
noname [10]

Answer:

the third one because oceans don't affect the weather  

Explanation:

7 0
3 years ago
Other questions:
  • Given the chemical equation, predict the ΔS system for this change.
    6·1 answer
  • If 27.1 g of ar(g) occupies a volume of 4.21 l, what volume will 1.29 moles of ne(g) occupy at the same temperature and pressure
    10·2 answers
  • What is the boiling point of a solution made by mixing 75.0g ZnCl2 with 375.0 grams of water? (Kb for water is 0.512 C/m)
    12·1 answer
  • Which term is testable, a prediction, and can be supported or refuted by data?
    15·1 answer
  • What is the shape of a molecule that has 3 atoms bonded to a central atom and no lone pairs of electrons?
    11·2 answers
  • If 24 moles oxygen gas combined with 24 moles hydrogen gas, what would be the limiting reactant?
    7·1 answer
  • *<br> Do you think odor is a property? Explain your ideas.
    7·1 answer
  • Complete the symbol equation for the preparation of sodium sulfate
    5·1 answer
  • Please help...<br> CaS cation and anion<br> ZnCl2 cation and anion<br> Cu2CrO4 cation and anion
    7·1 answer
  • If we had 79.3 grams of Xe, would we expect a volume that is
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!