The answer is D. Stars are formed from interstellar clouds because of the Law of Universal Gravitation. The interstellar clouds are termed as nebula. When other stars dies a supernova occurs then the gravity from this pushes matter into the clouds until it cannot overcome the gravitational pull and it collapses which heats matter up forming a star.
Answer:
The mass percentage of each element in the compound Al2O3 is 52.9% Al and 47.1% O.
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Answer:
B. Add more chloride ions
Explanation:
Because we know based on lechatlier that any disturbance to equilibrium will make the shift act accordingly. If something is removed it wants to shift to side where it is removed to compensate for the change, if something is added it wants to move away from it to minimize the change.
Therefore, if you add chloride ions, the equilibrium shifts to left to make more solid lead chloride.
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Answer:</h2>
Beryllium ion.
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Explanation:</h2>
- Adding one proton to an atom of lithium which have 3 protons, 4 neutrons and 3 electrons will form a beryllium ion.
- The new atom formed after adding a proton will have 4 protons and 4 neutrons since to have a mass number of 9 then it has to form an ion.
- Beryllium is of gray colour, strong, light-weight, and used as hardening agent in different alloys. It has one of the highest m.p(melting point) in the light metals.
Result: On adding a proton in lithium will form a beryllium ion.
Weathering breaking down rock and erosion transporting rock material at or near the earth's surface breaks down rocks into small and smaller pieces. These smaller pieces of rock such as sand, silt, or mud can be deposited as sediments that, after hardening, or lithifying, become sedimentary rocks.
