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
wlad13 [49]
3 years ago
14

How does radioactivity make it possible to understand how earth can be so old and still have a hot interior?

Chemistry
2 answers:
SashulF [63]3 years ago
8 0
I know that we can find how old the Earth is by knowing how much uranium ultimately decayed into lead. Uranium-238 has a very long to decay, about 4.5 billion years. So that is how we are able to understand how old the Earth is.
Sophie [7]3 years ago
4 0

Answer:

The reason is that there are radioactive elements that are in the center of the earth.

Explanation:

If the earth were only a rock cooling from the time of its birth. It should have already cooled completely thousands of years ago. However, volcanoes continue to shed hot magma and this is proof that there is a source of heat in the center of the earth. This source of heat is due to the radioactivity of elements such as Uranium and Thorium that were enclosed during the formation of the earth. These elements slowly disintegrate emitting particles that collide with others emanating heat.  For example, the half-life of uranium is 4.5 billion years, which means that it decays very slowly.

You might be interested in
Which solution below has the highest concentration of hydroxide ions?a. pH= 3.21b. pH= 7.00c. pH= 7.93d. pH= 12.59e. pH= 9.82
Sloan [31]

Answer:

  • <em>The solution that has the highest concentration of hydroxide ions is </em><u>d. pH = 12.59.</u>

Explanation:

You can solve this question using just some chemical facts:

  1. pH is a measure of acidity or alkalinity: the higher the pH the lower the acidity and the higher the alkalinity.
  2. The higher the concentration of hydroxide ions the lower the acidity or the higher the alkalinity of the solution, this is the higher the pH.

Hence, since you are asked to state the solution with the highest concentration of hydroxide ions, you just pick the highest pH. This is the option d, pH = 12.59.

These mathematical relations are used to find the exact concentrations of hydroxide ions:

  • pH + pOH = 14 ⇒ pOH = 14 - pH

  • pOH = - log [OH⁻] ⇒ [OH^-]=10^{-pOH}

Then, you can follow these calculations:

Solution    pH        pOH                            [OH⁻]

a.               3.21       14 - 3.21 = 10.79        antilogarithm of 10.79 = 1.6 × 10⁻¹¹

b.               7.00      14 - 7.00 = 7.00        antilogarithm of 7.00 = 10⁻⁷

c.                7.93      14 - 7.93 = 6.07        antilogarithm of 6.07 = 8.5 × 10⁻⁷

d.               12.59     14 - 12.59 = 1.41        antilogarithm of 1.41 = 0.039

e.               9.82      14 - 9.82 = 4.18        antilogarithm of 4.18 = 6.6 × 10⁻⁵

From which you see that the highest concentration of hydroxide ions is for pH = 12.59.

5 0
2 years ago
Which of the following is true for an excess reactant?
kupik [55]

Answer:

C) It is the reactant that is left over after the reaction stops.

Explanation:

The excess reactant is the reactant that is left over after the reaction stops. The extent of the reaction is not determined by this reactant.

A limiting reactant is a reactant that is in short supply within a given reaction.

Such reactants determines the extent of chemical reaction.

  • Limiting reactants are used up in a chemical reaction.
  • The excess reactants remains unchanged after the reaction.
8 0
2 years ago
The radioactive atom R 88 210 a is an alpha emitter. What nucleus does it produce?
olasank [31]

Answer:

X 86 206

Explanation:

Radioactive atoms are nuclei that can under go disintegration to emit either an alpha particle, beta particle or gamma radiation. The process could be spontaneous or stimulated.

When a radioactive atom R 88 210 emits alpha particle, it would produce an element with atomic number 86 and mass number 206 i.e X 86 206. An alpha particle is usually a helium nucleus.

                     R^{210} ⇒ x^{206} + He^{4} + energy

5 0
3 years ago
Calculate the ph of a 0.005 m solution of potassium oxide k2o
Alecsey [184]
First, we have to see how K2O behaves when it is dissolved in water:

K2O + H20 = 2 KOH

According to reaction K2O has base properties, so it forms a hydroxide in water.
For the reaction next relation follows:

c(KOH) : c(K2O) = 1 : 2

So,

c(KOH)= 2 x c(K2O)= 2 x 0.005 = 0.01 M = c(OH⁻)

Now we can calculate pH:

pOH= -log c(OH⁻) = -log 0.01 = 2

pH= 14-2 = 12




3 0
3 years ago
Write formula of compound given two chemicals
Evgesh-ka [11]
Nitrous oxide has 2 nitrogen atoms and 1 oxygen atom per molecule
3 0
2 years ago
Other questions:
  • Looking at Group 2A of the periodic table, which of these element probably has the lowest ionic radius? a) beryllium b) magnesiu
    12·1 answer
  • Help please. The combustion of pentane, C5H12, occurs via the reaction
    6·1 answer
  • Well over _______ different organic compounds are known to exist.
    13·1 answer
  • Ethanol has a density of 0.79g/mL what is the volume, in quarts, of 1.50 kg of ethanol?​
    8·2 answers
  • What are the three types of scientific investigations?
    11·2 answers
  • When water and alcohol are mixed, the final volume is less than the total of volume of alcohol plus water added due to .......​
    12·1 answer
  • Convert 2.41 x 10^2 m to cm
    11·1 answer
  • g calculate the quantity of energy produced per gram of uranium 235 for the neutron induced Fusion of uranium
    11·1 answer
  • How many valence electrons are found in a neutral atom of arsenic?
    9·1 answer
  • Which change is likely to happen to an atom of the element strontium (Sr) during bonding?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!