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
lozanna [386]
3 years ago
15

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second?(Note that the half life o

f Uranium-238 is 4.468x109 years)
Chemistry
1 answer:
Rom4ik [11]3 years ago
7 0

Answer:

Use the activity formula,  

T1/2 = 4.468 x 10^9 yr x 365 x 24 x 3600 = 1.409 x 10^17 sec  

l = ln(2)/T1/2 = ln(2)/1.409 x 10^17 = 4.91932697 x 10^-18 s-1  

DN/Dt = lN, 265 = 4.91932697 x 10^-18 x N  

<u><em>N = 5.38 x 10^19 nuclei</em></u>

You might be interested in
A solution is made by adding 200 g table salt to 1
pochemuha

We say that the solution is unsaturated.

Explanation:

If the salt solubility is 36 g in 0.1 L of water then we can dissolve 360 g of salt in 1 L of water.

Because the solution contains 200 g of salt in 1 L of water, the solution is unsaturated because more salt can be added until we reach the saturation point.

We call the solution dilute when we compare the concentration of a solution with the concentration of another solution, but here we do not compare different solutions.

Learn more about:

solubility

brainly.com/question/9126711

#learnwithBrainly

7 0
3 years ago
Read 2 more answers
How many atoms are in 1.65 mol of potassium
cluponka [151]

Answer:

<h2>9.93 × 10²³ atoms</h2>

Explanation:

The number of atoms of potassium can be found by using the formula

<h3>N = n × L</h3>

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 1.65 × 6.02 × 10²³

We have the final answer as

<h3>9.93 × 10²³ atoms</h3>

Hope this helps you

3 0
3 years ago
What is the concentration of hydrogen ions in a solution with a pH of 2.36?
Viefleur [7K]

Answer:

b)

Explanation:

pH =  -  log[H {}^{ + } ] \\ 2.36 =  -  log[H {}^{ + } ] \\ [H {}^{ + } ] =  {10}^{ - 2.36}  \\ [H {}^{ + } ] = 4.37 \times  {10}^{ - 3}  \: M

8 0
3 years ago
If maltose undergoes hydrolysis what subunits does it results to?
Levart [38]
<h3><u>Answer;</u></h3>

Two glucose molecules

<h3><u>Explanation;</u></h3>
  • Maltose is a disaccharide that is made up of two glucose molecules joined with an alpha(1-4) bond.
  • <em><u>Maltose is produced by the enzymatic hydrolysis of starch, a polysaccharide, catalyzed by the enzyme amylase. Maltose is then hydrolyzed by the enzyme maltase to produce two molecules of d-glucose.</u></em>
  • <em><u>The enzyme maltase efficiently catalyses the hydrolysis of maltose into 2 glucose molecules. </u></em>
7 0
3 years ago
Why is an ecosystem still healthy although there's still a lot of consumers in it?
siniylev [52]

Answer:

because it is a sign that there are more producers for the consumers.

Explanation:

An ecosystem consist of the abiotic or inorganic components, the animals[consumers], the plants[producers] and the decomposers. An ecosystem simply means the environment of organisms that are living together and the way these organisms interact with another.

The producers that is the plants are the ones manufacturing food by themselves either by photosynthesis or chemosynthesis and the consumers are the ones relying on the producers for food.

The ecosystem is still healthy even when there's still a lot of consumers in it because it shows that there are come producers that is to say the producers are more also. If this is not the case, then the ecosystem will not be healthy as the consumers will eat the producers until the producers will not be enough.

3 0
3 years ago
Other questions:
  • Elaborate what knowing that carbon-14 has an atomic number of 6 tells us about the atom.
    14·2 answers
  • Predict which atom has a higher ionization energy. CL or I
    5·2 answers
  • The specific heat of aluminum is 0.125 cal/g °C. If 12.5 grams of aluminum were heated from 20.0 °C to 100.0 °C, calories of hea
    6·2 answers
  • Marina is using a metal spoon to stir her hot soup. Why does the spoon feel warm?
    8·1 answer
  • if 14g of ethene reacts with excess amount of steam to give 17.25g of ethanol what is the percentage yield
    10·1 answer
  • What is the nucleon number​
    12·1 answer
  • Acids
    7·1 answer
  • IF CORRECT ILL GIVE BRAINLEIST
    10·2 answers
  • . Intermolecular forces can exist between:
    15·1 answer
  • The local weather station is predicting that a warm front will pass through Charlotte, NC in two days.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!