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I am Lyosha [343]
3 years ago
12

which type of matter is composed of two or more elements that are chemically combined in a fixed proportion

Chemistry
1 answer:
timofeeve [1]3 years ago
5 0
Molecules are groups of two or more atoms that are chemically combined. Molecules also have a fixed proportion of each atom that is used to make them.
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Which of the following best describes the transfer of fecal coliform and an impact on the environment?
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Answer:

Fecal coliform increases the amount of organic substances in water and lowers the amount of dissolved oxygen, killing fish.​

Explanation:

Fecal coliform are species of bacteria that are found in the intestine of warm-blooded animals like humans etc. Hence, they are released whenever they excrete feaces. Due to this reason, the presence of fecal coliform bacteria in a water body indicates fecal discharge into that water.

The presence of excessive fecal coliform in a water body increases the amount of organic substances in the water. These organic substances are decomposed by bacteria, which causes the oxygen present in the water body (dissolved oxygen) to deplete/decrease. The depletion of oxygen in the water threatens aerobic aquatic organisms e.g fishes and they ultimately suffocate and die.

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3 years ago
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Unit Test
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Explanation:

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What is the mass of 4.2 mol of the element iron (Fe)?Answer in units of g.
lbvjy [14]

Answer:

2.35 *10^2 g

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8 0
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When air pressure rapidly falls, what weather change usually occurs?
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