The three primary sources of air pollution are _____.

Chemistry

2 answers:

Kisachek [45]3 years ago

7 0

There are four main types of air pollution sources:

mobile sources – such as cars, buses, planes, trucks, and trainsstationary sources – such as power plants, oil refineries, industrial facilities, and factoriesarea sources – such as agricultural areas, cities, and wood burning fireplacesnatural sources – such as wind-blown dust, wildfires, and volcanoes........hope i helped

ra1l [238]3 years ago

6 0

Cars,air planes,factories

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Several years ago, a group of scientists discovered evidence for a new element not found on the periodic table. Most

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It is beneficial because it provides stronger support for the evidence related to the discovery

Answer: The correct answer is the second option that is given with shows it is beneficial.

Explanation:

The discovery of an element whose properties are known from before would make it easier for the scientists to know the properties of elements and its uses after the discovery of element.

Since the elements’ properties are already known as element that possesses these properties and will look forward to find that and once the element is found the element can be named and can be used directly, since its uses are already known.

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Fermium-253 is a radioactive isotope of fermium that has a half-life of 3.0 days. A scientist obtained a sample that contained 2

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Problem 2

You start out with 216 ugrams of Fermium - 253. After 3 days, you will have 1/2 as much. 108 ugrams is what you have.

Another 3 days goes by. You started with 108 ugrams. That gets cut in 1/2 again. Now you have 54 ugrams.

Finally another 3 days goes by. You started with 54 ugrams. you now have 1/2 as much which would be 27 ugrams

#days Amount in micrograms

0 216

3 108

6 54

9 27

Problem One

You are using Nitrogen as your base example. The first thing you should do is fill in the table. Then you should try and make some rules. You need the rules in case the exam you are preparing for picks a different element to talk about these bond tendencies. In any event, it's handy to think this way.

Table

Bond Energy Kj/Mol Bond Length pico meters

N - N 167 145

N=N 418 125

N≡N 942 110

Rules

As the number of bonds INCREASES, the energy contained in the bond goes UP

As the number of bonds INCREASES, the length of the bond goes DOWN.

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3 years ago

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