Answer:
electrolysis is a technique that uses a direct electric current to drive an otherwise non-spontaneous chemical reaction
Explanation:
The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of carbon.
<h3>What is the atomic mass?</h3>
The atomic mass is a measurement used in physics and chemistry to denote the average atomic mass of a given element which is measured in the atomic mass unit or amu.
In conclusion, the atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of carbon.
Learn more about the atomic mass here:
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We know, by law of constant proportion :
Chemical compounds always contains its component in constant fixed ratio or in fixed percentage without depend on its source, method of preparation and mass of compound.
Therefore, percentage of oxygen is same for any mass.
Hence, this is the required solution.
Answer:
d. at 25.0 and 1 atm
Explanation:
The standard heat of formation of a substance is the amount of heat absorbed or evolved when 1 mole of the substance is formed from from its constituent elements. It is also known as standard enthalpy of formation.
All elements in their natural states, have a standard heat of formation of zero because there is no temperature change involved in their formation. Example includes oxygen gas, graphite (solid carbon).
a. ΔH° of at standard pressure of 1 atm is zero, but not at 2 atm
b. ΔH° of Fe at 25.0 is zero, but not at 1200
c. ΔH° of is not zero because it's a compound
d. ΔH° of is zero at standard conditions
Answer:
C: The shape of the pebbles is a result of weathering and deposition
Explanation:
For the several pebbles to have a rounded shape and smooth to the touch, it will undergo weathering and deposition. This is because weathering involves breaking down of rocks and creating new sediments. This weathering could be either chemical weathering or physical weathering where Chemical weathering is the decomposition of rocks which are caused by chemical reactions and which result in formation of new compound while physical weathering is the breakdown of rocks into smaller pieces. On the other hand, deposition occurs when the agents of erosion such as wind or water deposit sediments from one spot to another which in turn changes the shape of the land.
Thus, the shape of the pebbles are as a result weathering of the parent rocks and from deposition.