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nexus9112 [7]
3 years ago
7

Figuring out how to make a better type of plastic is which type of research

Chemistry
2 answers:
quester [9]3 years ago
5 0

Answer:applied chemistry

Lerok [7]3 years ago
5 0

Answer:

Plastics are important in our society providing a range of benefits.

•

Waste plastics, nowadays, burden the marine and terrestrial environment.

•

Additives and PoTSs create complications in all stages of plastics lifecycle.

•

Inappropriate use, disposal and recycling may lead to undesirable release of PoTSs.

•

Sound recycling of plastics is the best waste management and sustainable option.

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Describe the changes that earths atmosphere has gone to overtime
irakobra [83]

Answer:

Over a vast amount of time, millions of years, the earth gradually cooled. When the temperature dropped enough, water vapor condensed and went from a gas to liquid form. This created clouds. From these clouds, the oceans formed and the oceans absorbed a lot of the carbon dioxide in the atmosphere.

Explanation:

8 0
2 years ago
What is the oxidation number of C in NaHCO3?
Phoenix [80]
Na = +1
H = +1
O = -2
Total charge is 0:
1 + 1 + C + 3 x -2 = 0
C = 4
4 0
3 years ago
Calculate the work, w, gained or lost by the system when a gas expands from 15 L to 45 L against a constant external pressure of
marta [7]

Answer:

Work done by the system = 4545 J

Explanation:

The expression for the calculation of work done is shown below as:

w=-P\times \Delta V

Where, P is the pressure

\Delta V is the change in volume

From the question,  

\Delta V = 45 - 15 L = 30 L

P = 1.5 atm

w=-1.5\times 30\ atmL

Also, 1 atmL = 101 J

So,  

w=-1.0\times0.75\times 101\ J=-4545\ J (negative sign implies work is done by the system)

<u>Work done by the system = 4545 J</u>

6 0
3 years ago
Which of the following chemical equations proves that the law of conservation of mass is in effect?
bogdanovich [222]

Answer:

2KCl + F₂   →     2KF + Cl₂

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

2KCl + F₂   →     2KF + Cl₂

In this equation mass of reactant and product is equal. There are 2 potassium 2 chlorine and fluorine atoms on both side of equation it means mass remain conserved.

All other options are incorrect because mass is not conserved.

Mg₂ + LiBr ---> LiMg + Br

In this equation mass of magnesium is more on reactant side.

Na +O₂ ---> Na₂O

In this equation there is more oxygen and less sodium on reactant side while there is more sodium and less oxygen on product side.

H₂O ---> H₂ + O₂

In this equation there is less oxygen on reactant side while more oxygen on product side.

5 0
3 years ago
Chemical bonds contain energy that can be released when they are broken. True False
faust18 [17]
The answer ox Falseeeeeeee......
7 0
3 years ago
Read 2 more answers
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