![subject](/tpl/images/cats/himiya.png)
PLEASE HELP ME
According to the law of conservation of energy, energy can't be created or destroyed, just used and converted into different forms. The amount of energy in a system does not change. For example, when a creature dies, the chemical energy in its muscles and blood becomes nutrients that feed the earth. But we are not able to use all of the energy we receive. For example, some energy is wasted as friction between the moving parts of machines; some energy may be converted into thermal energy and radiated into the air, which we can't use. Today, we are faced with the problem of finding the best sources of energy for us to use with the least amount of waste.
We divide our energy resources into two categories: renewable and nonrenewable. Nonrenewable energy resources are those that we can't easily replace. For example, that chemical energy from plants stored as petroleum, natural gas or coal is called fossil fuels. As their name implies, fossil fuels took millions of years to produce; they're nonrenewable because we can't wait millions of years to produce more.
It is important to be careful when using nonrenewable resources because
A
there is a limited supply of them and we can’t make any more.
B
harnessing their energy is a very dangerous process.
C
they are more likely to produce excess thermal energy that we can’t use.
D
there is a possibility of finding dinosaur bones in petroleum or coal deposits.
![ansver](/tpl/images/cats/User.png)
Answers: 1
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 11:30
Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.
Answers: 3
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 12:00
Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.
Answers: 3
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 00:00
Predict the relative bond lengths of the three carbon-oxygen bonds in the carbonate ion (co2−3). what would you expect the charge to be on each oxygen? match the words in the left column to the appropriate blanks in the sentences on the right. make certain each sentence is complete before submitting your answer.
Answers: 3
![question](/tpl/images/cats/himiya.png)
You know the right answer?
PLEASE HELP ME
According to the law of conservation of energy, energy can't be created or destroyed...
Questions
![question](/tpl/images/cats/en.png)
English, 20.09.2020 16:01
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.09.2020 16:01
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.09.2020 16:01
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 20.09.2020 16:01
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/ap.png)
Advanced Placement (AP), 20.09.2020 16:01
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 20.09.2020 16:01
![question](/tpl/images/cats/mat.png)
Mathematics, 20.09.2020 16:01
![question](/tpl/images/cats/istoriya.png)
History, 20.09.2020 16:01
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.09.2020 16:01
![question](/tpl/images/cats/en.png)
English, 20.09.2020 16:01