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
torisob [31]
3 years ago
7

The quantity, q grams, of the radioactive isotope strontium-90 present in a sample decreases by half over a period of about t =

28.8 years. if a sample initially contains 3 grams of strontium-90, what equation represents the relationship between q and t?
Chemistry
2 answers:
velikii [3]3 years ago
8 0
Notice q=3/2, is half of the original q = 3(<span>1/2</span>)<span>t/28.8
your welcome

</span>
Luda [366]3 years ago
7 0

Explanation:

Mass of the strontium-90 present at initial stage= N_o=3 grams

Mass of the strontium-90 present after time t = N = q

The half life of strontium-90 = t_{1/2}=28.8 years

Decay constant = \lambda

\lambda =\frac{0.693}{t_{1/2}}=\frac{0.693}{28.8 years}=0.02406 years^{-1}

\ln N=\ln N_o -\lambda t

\ln q=\ln 3 - 0.02406 years^{-1}\times t

0.02406 years^{-1}\times t=\ln 3 - \ln q

0.02406 years^{-1}\times t=\ln \frac{3}{q}

t=41.50 \ln \frac{3}{q}

e^t=(\frac{3}{q})^{41.50}

From the above expression we can see that t and q are inversely related to each other.

You might be interested in
a. silicon<br> b. carbon <br> c. beryllium <br> d.chromium
zepelin [54]
The answer is silicon because it’s atomic number is 14
3 0
3 years ago
Read 2 more answers
In a soil profile, which is the second layer?<br> solid rock<br> subsoil<br> parent rock<br> topsoil
taurus [48]

Subsoil is the layer of soil under the topsoil on the surface of the ground.

7 0
3 years ago
Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electroneg
Ivan

Answer:

Ionic or electrovalent bonds

Explanation:

Ionic or electrovalent bonds are interatomic or intramolecular bonds which are formed between two kinds of atoms having a large electronegativity difference usually 2.1.

Electronegativity is the property that combines the ability of an atom to gain or lose electrons. It is expressed as the tendency with which atoms of elements attracts valence electrons in a chemical bond.

In this bond type, a metal transfers its electrons to a more electronegative atom which is a non-metal.

6 0
3 years ago
Read 2 more answers
Formula for Sodium Hydrogen Carbonate NaHCO3? or Na2HCO3?
yan [13]

NaHCO3 is the right answer

8 0
3 years ago
pls this is my second time asking these questions, i'm sorry, but i really need help!!! 1. what happens to atoms when there is a
dusya [7]

Answer:

the atoms of the original substances gain, lose and even share their very own electrons. write the symbols of the elements that form the compound. Write down the valency, and lastly go over valencies. This is all I got so far. I hope this helps

Explanation:

8 0
3 years ago
Other questions:
  • When the concentration of hydronium ions equals the concentration of hydroxide ions, it is called the _____.
    9·2 answers
  • Insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 425 mL of insu
    11·1 answer
  • I'll give you a medal :)
    15·2 answers
  • Which element had the smallest atomic radius
    8·1 answer
  • A curved piece of glass or other transparent material that is used to refract light is called a (an) _____.
    10·2 answers
  • BRAINLIESTTT ASAP!!! PLEASE HELP ME :)
    8·2 answers
  • Suggest a suitable electrolyte that could be used if the iron ring is to be plated with silver​
    11·1 answer
  • What is the electron confiquation for <br> for the element Re
    14·1 answer
  • Toluene (C7H8) burns in oxygen to produce cardon dioxide and water. (a) How many grams of oxygen are neccessary for the combusti
    13·1 answer
  • 5.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!