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
bulgar [2K]
3 years ago
12

The ages of rocks that contain fossils can be determined using the isotope 87Rb. This isotope of rubidium undergoes beta

Chemistry
1 answer:
AVprozaik [17]3 years ago
7 0

Answer:

Age of rock = 722 million years old

Explanation:

Using the formula; <em>fraction remaining = 0.5ⁿ</em>

where n = number of half lives elapsed.

However, from the given values, fraction remaining = 1.000 - 0.0105

fraction remaining = 0.9895

Substituting in the formula to determine the number of half-lives:

0.9895 = 0.5ⁿ

log 0.9895 = n log 0.5  

-0.0045842 = -0.30103 n

number of half lives elapsed, n = 0.0152

Therefore age of rock = 0.0152 x 4.75 x 10¹⁰ years =  7.22 x10⁸ years

Age of rock = 722 million years old

You might be interested in
What is the formula of titanium(II) oxide?(1) TiO (3) Ti2O(2) TiO2 (4) Ti2O3
ddd [48]
Hehe I love Titanium!! ;) Anyways, the chemical formula of titanium (II) Oxide is TiO
6 0
3 years ago
Choose two of the following scientists: Anton Lavoisier, John Dalton, JJ Thomson, Robert Millikan, Ernest Rutherford, James Chad
elixir [45]

Answer:

John Dalton:

John Dalton was the scientist who introduced atomic theory in the field of chemistry. Dalton worked on different gases and formulated this theory. The main points of Dalton's theory are:

  • Every element present is made up of atoms.
  • Atoms of an elements are have the same same properties whereas these properties are different for each element.
  • According to his theory, an atom could not be broken down.
  • Different atoms combine or get separated from each other during a chemical reaction.

Ernest Rutherford:

Ernest Rutherford is known as the father of nuclear physics due to his impressing research work on radioactivity of atoms. Rutherford was the first scientist to discover the nucleus of an atom and prove that the nucleus was charged. He also described that the electrons circle around the nucleus of an atom.

6 0
3 years ago
Based on the information in the table, which of the following arranges the bonds in order of decreasing polarity?
patriot [66]

Polarity is the chemical property based on the electric charge and orientation of the poles. Al−O>H−Br>As−S is arranged in decreasing order of polarity. Thus, option d is correct.

<h3>What is polarity?</h3>

Polarity is a chemical property of the distribution of the electrical charges over their respective atom in the molecule joined by the bonds. The relation between the polarity and the difference in electronegativity is directly proportional.

The electronegativity difference between the elements are:

  • Al−O = 1.8
  • H−Br = 0.8
  • As−S = 0.4

As the electronegativity difference between Al−O = 1.8 is the highest it will have the highest polarity followed by H−Br = 0.8, and As−S = 0.4, with the lowest polarity.

Therefore, option D. Al−O>H−Br>As−S is arranged in decreasing order of polarity.

Learn more about electronegativity here:

brainly.com/question/25217877

#SPJ1

6 0
2 years ago
Answer these questions based on 234.04360 as the atomic mass of thorium-234. The masses for the subatomic particles are given. R
Scilla [17]

How many protons does Thorium have? 90

How many neutrons does Thorium-234 have? 144

Calculate the mass defect for the isotope thorium-234 1.85864 amu

4 0
4 years ago
Read 2 more answers
Helpppp
ELEN [110]
Cation and an anion the differences in charge make them attracted to each other
7 0
3 years ago
Read 2 more answers
Other questions:
  • How are elements symbols represented on the periodic table
    6·1 answer
  • Which of the following represent configurations of thallium ions in compounds? Explain your decision in each case. a TIP" [Xe]4f
    8·1 answer
  • Is hydrogen and sulfur ionic or covalent
    11·1 answer
  • This system relates to the process by which an organism gets rid of its waste.
    10·2 answers
  • I'm sad to announce that this will most likely be my last day on brainly until next year, and to all the friends I've made on he
    9·1 answer
  • When carbonates react with acids fizzing occurs.what does the fizzing indicate?​
    10·1 answer
  • In order to use the Ideal Gas Constant of 0.0821, what units must be used for volume, pressure, amount, and temperature?
    10·1 answer
  • An atom of element Be has four protons, four electrons, and five neutrons. Which element below could be an isotope of this atom?
    13·2 answers
  • D
    11·2 answers
  • _C2H5OH + _O2–&gt;_CO2 + _H2O<br><br> How do u balance in the equation
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!