What is a rock made out of shells and corals cemented together
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A rock made out of shells and corals cemented together is called a limestone.
A rock is a naturally occurring solid substance composed of one or more minerals or mineraloids.
- Limestone is a sedimentary rock that is composed mainly of calcium carbonate (
) in the form of the mineral calcite.
- Limestone forms from the accumulation of shells, coral, and other debris that have been deposited on the bottom of bodies of water such as oceans, lakes, and rivers.
- Over time, the weight of the overlying sediment compacts and cements the shells and other debris together to form solid rock.
Therefore, a limestone is a rock formed by the cementation of shells and corals.
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Intertidal zone is the shallowest part of an ocean ecosystem where the depth is not too much.
What is an ecosystem?
An Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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A.) Element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table.
B.) Element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table.
C.) Element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons.
D.) Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.
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Answer: Option (D) is the correct answer.
Explanation:
Valence shell is the shell present on the outermost core of an atom and electrons present in the valence shell are known as valence electrons.
If an atom has completely filled valence shell then it means the atom is not reactive in nature because it is already stable.
But when an atom has less than eight electrons in its valence shell then it means to attain stability the atom will readily attract electrons towards itself.
As the given element 1 has 8 electrons in its valence shell. Hence, it is not reactive in nature but element 2 has 6 valence electrons. So, in order to attain stability element 2 will readily attract 2 electrons from a donor atom.
Thus, we can conclude that element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.
Answer:
Its D
Explanation:
I got it right on the test
Answers
pressure that is exerted by one gas as if it occupied a container by itself
half of the pressure that is exerted by the gases of a mixture on the container
Osum of the individual pressures that are exerted by two or more gases
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The pressure that is exerted by one gas as if it occupied a container by itself best defines partial pressure in a mixture of gases. Therefore, option B is correct.
What is partial pressure ?
Partial pressure is defined as the pressure exerted by each gas in a container filled with more than one gas. The pressure of any gas contained within the container is referred to as its partial pressure.
The concept of partial pressure is derived from the fact that each specific gas contributes a portion of total pressure, which portion is the partial pressure of that gas. It's almost like using a percentage or fraction of the total to describe all the parts.
A gas's partial pressure is a measure of the thermodynamic activity of its molecules. Gases dissolve, diffuse, and react in gas mixtures and liquids based on their partial pressures, not their concentrations.
Thus, option B is correct.
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Answer:
pressure that is exerted by one gas as if it occupied a container by itself.
Answers
AntoineLavoisier incorrectly characterize light as matter. The correct option is A.
Who was Antoine Lavoisier?
He is best known for discovering the role of oxygen in combustion. Antoine Lavoisier was a Frenchchemist who discovered that air is the source of combustion and acidity. He developed the metric system and debunked the phlogistontheory.
A diligent researcher, Antoine-Laurent Lavoisier, fundamentally changed chemistry. Among his many accomplishments, he established the law of conservation of mass, discovered that combustion and respiration are caused by chemical reactions with what he called "oxygen," and helped systematize chemicalnomenclature.
An element, according to Lavoisier, is a chemicalsubstance that cannot be decomposed using current analyticalmethods.
Mendeleev defined an element as a substance made up of atoms with the same atomic weight. Light is incorrectly described as matter by AntoineLavoisier.
Thus, the correct option is A.
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Light
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