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rjkz [21]
4 years ago
10

How many “A” columns are there on the periodic table

Chemistry
1 answer:
Cerrena [4.2K]4 years ago
8 0

Answer:

18

Explanation:

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Which is not true of radioactive half-life? radioactive half-life is increased by heating the isotope. independent of the physic
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<span>radioactive half-life is increased by heating the isotope.</span>
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The rainforest contains what percentage of all of the species in the world?
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I think 50%

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Which statement best describes a relationship amongst hypotheses, theories, and laws
Ganezh [65]

The relationship between hypotheses, laws and theories is that a law is used to explain hypothesis and theories.

<h3>What is a law, a theory and hypothesis?</h3>

A hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further investigation or experimentation.

A theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed.

A law is a statement whose sequence or relationship of phenomena is invariable under certain conditions.

This suggests that a law can be used to explain a theory and hypothesis.

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8 0
2 years ago
Is an example of the carbon cycle occurring slowly?(1 point)
o-na [289]

Decomposition is a part of the carbon cycle that occurs slowly hence  movement of carbon dioxide into the atmosphere when bacteria decomposes dead matter is a slow part of the carbon cycle.

<h3>What is the carbon cycle?</h3>

The carbon cycle is part of the biogeochemical cycles that exist in nature. It refers to the movement of carbon in the ecosystem. The carbon cycle cuts across the air, the land and the water bodies.

The process in the carbon cycle that occurs slowly among the options is the movement of carbon dioxide into the atmosphere when bacteria decomposes dead matter.

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7 0
3 years ago
How many atoms of oxygen are present in 7.51 grams of<br> glycine with formula C₂H5O2N?
Blizzard [7]

1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N. Details about number of atoms can be found below.

How to calculate number of atoms?

The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

However, the number of moles of oxygen in glycine can be calculated using the following expression:

Molar mass of C₂H5O2N = 75.07g/mol

Mass of oxygen in glycine = 32g/mol

Hence; 32/75.07 × 7.51 = 3.2grams of oxygen in glycine

Moles of oxygen = 3.2g ÷ 16g/mol = 0.2moles

Number of atoms of oxygen = 0.2 × 6.02 × 10²³ = 1.205 × 10²³ atoms

Therefore, 1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N.

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