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
Alona [7]
3 years ago
5

"All is strange and vague."

Chemistry
2 answers:
MrRissso [65]3 years ago
5 0

Answer:

WHERE YOU AT

Explanation:

TPAT

AveGali [126]3 years ago
4 0

Answer:

This is Ohio.

Explanation:

(no dude im dead i live in kentucky XP)

You might be interested in
16. Chemists can synthesize new materials using
Alex787 [66]

Answer:

Yes Concurred,but where is the question

8 0
2 years ago
Which solution has the greatest osmolarity?
aliya0001 [1]
Electric hidro because he has the highest osmolarity
4 0
3 years ago
____ is converted to carbohydrate by plants during photosynthesis.
Ratling [72]
Carbon dioxide 
Have a great day:)
5 0
3 years ago
Read 2 more answers
Promethium-147 is sometimes used in luminescent paint. It has a half-life of 956.3 days. If 250 grams (g) of promethium-147 is u
Fantom [35]

Answer:

% = 76.75%

Explanation:

To solve this problem, we just need to use the expressions of half life and it's relation with the concentration or mass of a compound. That expression is the following:

A = A₀ e^(-kt)   (1)

Where:

A and A₀: concentrations or mass of the compounds, (final and initial)

k: constant decay of the compound

t: given time

Now to get the value of k, we should use the following expression:

k = ln2 / t₁/₂   (2)

You should note that this expression is valid when the reaction is of order 1 or first order. In this kind of exercises, we can assume it's a first order because we are not using the isotope for a reaction.

Now, let's calculate k:

k = ln2 / 956.3

k = 7.25x10⁻⁴ d⁻¹

With this value, we just replace it in (1) to get the final mass of the isotope. The given time is 1 year or 365 days so:

A = 250 e^(-7.25x10⁻⁴ * 365)

A = 250 e^(-0.7675)

A = 191.87 g

However, the question is the percentage left after 1 year so:

% = (191.87 / 250) * 100

<h2>% = 76.75%</h2><h2>And this is the % of isotope after 1 year</h2>
3 0
3 years ago
Read 2 more answers
A patient administered 20 mg of iodine-131. How many mg of this radioactive isotope will remain the body after 24 days? NEEDS AN
vredina [299]

Answer:

I need the answer too someone plzzz answer this!!!

Explanation:

7 0
3 years ago
Other questions:
  • What is the [h3o ] for a solution of seawater at 25°c that has a ph of 8.3?
    11·1 answer
  • I need help with this table
    12·1 answer
  • Can you give examples of carbon in our living environment?
    15·2 answers
  • Write iupac name of :
    7·1 answer
  • This version of Einstein's equation can be used directly to find what value? `Δm = E/c^2
    10·2 answers
  • A student mixes some water at room temperature with a white powder also at room temperature. The white powder disappears into th
    13·1 answer
  • 5.0g of aluminum fluoride decomposes into aluminum and oxygen. What mass of oxygen is formed?
    13·1 answer
  • Which of the following environments is most likely to have days with a relative humidity of less than 10% (ten percent)?
    10·1 answer
  • Helppppppppppppppppppppppppppp
    6·1 answer
  • A chemist wants to observe the following reaction:
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!