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mariarad [96]
1 year ago
13

Which substance is not a solid at 20˚C and one atmosphere of pressure?

Chemistry
1 answer:
levacccp [35]1 year ago
3 0
Choose A, Kr is noble gas
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How do you determine the environmental impact of human activities?
coldgirl [10]

Answer:

Environment refers to everything that surrounds an individual and interacts between them. The factors that control the environment can be biotic and abiotic.

Humans have greatly affected the environment. Some of the ways in which the environment is affected by humans are as follows-

(1) Humans have constructed industries and factories that have released a huge amount of toxic gases into the atmosphere.

(2) These harmful gases have increased the earth's global temperature. As a result of which the global warming effect has increased.

(3) The waste materials eliminated from these industries mix with the rivers and streams and pollute the water. It degrades water quality.

(4) The fossil fuels are exhausted at a very high rate.

(5) The spilling of the oils in the oceans has affected the marine species drastically.

(6) Due to the extensive mining at different places, soil fertility has decreased considerably.

(7) Cutting down trees for settlement purposes and other infrastructures.

6 0
3 years ago
Which is an example of a heterogeneous mixture? <br>A coffee<br>B soil<br>C gelatin<br>D air
mariarad [96]
Heterogeneous mixtures are made of different substances that remain physically seperate. An example would be mixing sand and sugar together.
the answer would be soil
The answer is B soil
6 0
3 years ago
How many moles of water are in 1.23 x 10^18 water molecules?
TiliK225 [7]

<span>1.23x10^24 atoms/6.022x10^23 atom/mol = 2.04 mol H20 </span>
3 0
3 years ago
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You have a balloon filled with hellum that has a volume of 4.91 cubic decimeters
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because the number of heliem is your aswer

5 0
2 years ago
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Which of the following types of rocks are likely to be formed due to compacting and cementing? Sedimentary rocks only Igneous ro
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