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
Mazyrski [523]
4 years ago
7

The half life of Uranium-238 is 4.5 billion years and the age of earth is 4.5 X 109 years. What fraction of Uranium-238 that was

present when Earth was formed still remains?
Chemistry
1 answer:
marta [7]4 years ago
3 0
The correct answer is 1/2
You might be interested in
If chemical bonds didn’t
hram777 [196]

All of the above answers are true right answer is option D

because, no bond no molecule no interaction no life,

no bond= only element will exist

Energy would not exist coz energy consumption and excretion takes place during bond formation and bond breaking process!

3 0
3 years ago
Read 2 more answers
Classify each of the following reactions when only the reactants are given and fill in the products.
Nadya [2.5K]

Answer:

CO2 + MgO

Explanation:

We want the number of each element on the Reactants (Left side) to be equal to the number of each element on the Product side (Right side).

3 0
3 years ago
Kernels of corn are heated and become popcorn. Why is this a chemical change?
goldfiish [28.3K]

Answer:

When popcorn is popped, liquid inside the kernel is changed to steam. Pressure from the steam builds up inside the kernel. When the pressure reached a critical stage the kernel pops turning itself inside out. This is a physical change.

Explanation:

6 0
3 years ago
Read 2 more answers
Give two examples of how our society uses isotopes
nalin [4]

Answer:

Isotopes – caused by varying numbers of neutrons in an element – have many practical uses in our society. ... In geology and archaeology, radioactive isotopes are used to determine the age of a sample while hydrologists can use isotope signatures to distinguish between different groundwater types.

Explanation:

Google. It's a magical place.

6 0
3 years ago
How is a compound different from a mixture? *
andreyandreev [35.5K]

Answer:

a.  mixtures are created through physical changes and compounds are created through chemical reactions

Explanation:

5 0
3 years ago
Other questions:
  • Calculate the solubility of carbon dioxide in water at an atmospheric pressure of 0.400 atm (a typical value at high altitude).A
    5·1 answer
  • The change in entropy, Δ????∘rxn , is related to the the change in the number of moles of gas molecules, Δ????gas . Determine th
    11·1 answer
  • Why will a toy train remain still if you push on the engine with
    6·1 answer
  • The organic compounds that are structural elements in the cell walls of plants and bacteria are known as
    9·1 answer
  • A solid precipitate is formed from the reaction of lead nitrate and sodium chromate.
    8·2 answers
  • Electrons, protons, and neutrons are three subatomic particles of an atom. If the atom undergoes a change and becomes a positive
    5·2 answers
  • A chemical reaction in which two or more elements switch places is called?
    11·1 answer
  • Which of these is an example of a chemical reaction that occurs at a very slow rate
    12·2 answers
  • To determine the mass of CO2 that forms from a given mass of CaCO3, which of the following must be known? Check all that apply.
    7·2 answers
  • Which best describes the law of conservation of mass?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!