Answer:
The answer that apply;
Movement of galaxies
Chemical composition of the Sun.
Light and the time it takes to traverse between particular points in the universe is used to calculate the age of distant stars and galaxies. Because of the vast nature of the universe, light takes earth years for it to travel from one galaxy to another. By knowing the speed of light and the amount of time taken for the light to travel from a distant celestial body, and use of geometric calculations, and brightness measurements we can tell in approximation the age of the celestial body. The age can also star can also be determined by their composition. Youg stars are mainly found have lighter elements such as helium. As they age, they have more composition of heavier elements such as iron. This is due to the fusion at the core of the sun that fuses lighter elements to heavier elements.
The answers that apply are;
radiometric dating of rocks
fossil evidence
gradual processes of rock
Radiometric dating means the use of half-life of naturally decaying elements such as carbon-14 to tell the age of a fossil or rock. The gradual formation of rocks such as lithification of sedimentary rock or metamorphosis of rock is also used to calculate the age of the earth by studying the stage in the process in which the rocks are in and extrapolating the age using calculations.
Explanation:
Answer: Please find answer in explanation column
Explanation:
During radioactive decay, the __unstable ________ isotope decays into a _stable ___________ isotope that has a different ____proton _______________ number
Or
During radioactive decay, the _ unstable parent nuclide ________ isotope decays into a _stable daughter nuclide ___________ isotope that has a different ____proton _______________ number.
There are 3 types of radioactive decay;alpha, beta and gamma, Of which the above clearly explains the beta decay. In beta decay, the unstable isotope having excess neutrons will undergo a beta decay emitting a beta particle.( ⁰₋₁e) causing the nucleus to loose a neutron but gain a proton.
Some heavy unstable isotopes which undergo radioactive (beta decay ) to become stable isotopes are phosphorus-32, strontium-90, iodine-131
Using Strontium 90 as an example , we have
⁹⁰₃₈St ----->⁹⁰₃₉Y + ⁰₋₁e
Strontium an unstable isotope undergoes a beta radioactive decay to form Yttrium.
Explanation:
A structure in which valence electrons are depicted by dots is called a lewis structure.
For example, atomic number of oxygen is 8 and its electronic distribution is 2, 6.
Hence, the electron dot structure for molecule is as depicted in the picture attached.
Answer:
Explanation: Ammonia is made out of one nitrogen and three hydrogen atoms. Its structure is tetrahedral. Ammonia is used in nitric acid production, as a fertilizer, and a cleaning solution.
NH3, normally found as a gas, it is caustic and harmful in longterm exposure. NH3 has a boiling point of -33 Celsius, and must be stored under pressure, or at low temperatures.
Ammonia is regulated in the United States as a substance that is a non-flamable gas. However, it still meets the definition of a material that is toxic by inhalation and requires a hazardous safety permit.
Ammonia is usually a gas with a pungent odor. Ammonia used commercially is usually named anhydrous ammonia. An exposure to a very high concentration of ammonia could result in lung damage and death
Ammonia is a gas with a strong smell. Its chemical formula is NH3. If exposed to a very high concentration of ammonia, it can cause lung damage and death.
Ammonia, NH3, is a compound that is has a strong smell. Even though the gas helps the nutrition of our planet, it can cause serious problems to our health.
Ammonia, NH3, is a pungent gas. It is colorless, and used to manufacture fertilizers and
<span>Propane is C3H8
The balanced equation is:
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
From the balanced equation you can see that for each mole of C3H8 you obtain 4 moles of H2O.
moles H2O = 5.0 moles C3H8(4 moles H2O/1 mole C3H8) = 20 moles H2O formed
Use Avogadro's number to find the number of molecules.
molecules H2O = 20 moles H2O(6.02 x 10^23 molecules/1 mole) = 1.20 x 10^25 H2O molecules</span><span>
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