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
wel
3 years ago
5

One of the radioactive isotopes used in chemical and medical research is sulfur-35, which has a half-life of 87 days. How long w

ould it take for 0.25 g to remain of a 1.00 g sample of sulfur-35
Chemistry
1 answer:
ASHA 777 [7]3 years ago
7 0

Answer:

Time taken = 174 days

Explanation:

Half life is the time take for a subsrtance taken to decay to half of it's origial or initial concentration.

In this probel, the haf life is 87 days, this means that after evry 87 days, the concentration or mass of sulfur-35 decreases by half.

If the starting mass is 1.00g, then we have;

1.00g --> 0.5g (First Half life)

0.5g --> 0.25g (Second half life)

This means that sulphur-335 would undergo two half lives for 0.25g to remain.

Total time taken = Number of half lives  * Half life

Time taken = 2 * 87

Time taken = 174 days

You might be interested in
The most well-known biogenic d-elements
galina1969 [7]

Answer:

Zn, Cu, Fe, Mn, Co, Mo

Explanation:

Biogenic elements are chemical elements constantly present in organisms and having definite biological significance(Bowen, 1966).

There are many of these biogenic elements in nature. Among the elements of the d-block, Zn, Cu, Fe, Mn, Co, Mo are worthy of mention among others.

Free ions of d- block metals are not found in the body. The elements are present in the form of bioinorganic  complexes of the respective metals. They commonly exist as co-factors of proteins that carry out essential biological functions.

6 0
3 years ago
Hydrogen gas is collected over water in an inverted buret. If the atmospheric pressure is 745 mm Hg, the vapor pressure of water
Varvara68 [4.7K]

Answer:

P_{H_2}=727mmHg

Explanation:

Hello there!

In this case, according to the given data, it is possible to infer that the gas mixture lies on the 15.0 cm-high column of water, so that the total pressure or atmospheric pressure is given by:

P_{atm}=P_{water}+P_{H_2}

Thus, since the atmospheric pressure is 745 mmHg and the vapor pressure of water is 18 mmHg, the pressure of hydrogen turns out to be:

P_{H_2}=P_{atm}-P_{water}\\\\P_{H_2}=745mmHg-18mmHg\\\\P_{H_2}=727mmHg

Best regards!

6 0
3 years ago
A reddish-orange element used for electrical wiring
dsp73
Copper is the answer to ur question
4 0
3 years ago
ANSWER QUICK PLEASE ILL GIVE BRAINLIEST AND 50 POINTS
yawa3891 [41]

Answer:

Single replacement and Zinc Sulfate

the 2nd one is double replacement and potassium nitrate

5 0
2 years ago
Read 2 more answers
Heat and pressure deep beneath earths surface can change any rock into what?
Alik [6]

Answer:

Metamorphic

Explanation:

Because it describes as a rock framed from other rocks by the action of heat and pressure.

5 0
3 years ago
Other questions:
  • How many moles are in 13.0 grams of water​
    8·1 answer
  • How many atoms are in carbon 12
    8·2 answers
  • 50 POINTS!
    5·1 answer
  • How many moles of oxygen would it takie to produce 8 moles of carbon dioxide?​
    14·2 answers
  • Which of the following SI or metric units is a base unit?
    9·1 answer
  • Identify what type of reaction is below. Also determine what coefficients that would balance the chemical equation. ___ HCl + __
    13·1 answer
  • Help plz will mark brainliest xD
    11·2 answers
  • Which products would form if chlorine gas was bubbled through a solution of sodium bromide?
    10·2 answers
  • I need help please on chemistry
    11·1 answer
  • Determine the molecular formulas of these compounds:
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!