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Maksim231197 [3]
3 years ago
7

Which sample of water contains particles having the highest average kinetic energy?

Chemistry
1 answer:
Makovka662 [10]3 years ago
7 0
(1) 25 ml of water at 95 degrees Celsius is your answer. Temperature is the average kinetic energy of the substance that it measures, therefore the highest temperature choice, aka #1, is your answer.
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Why is it so important to use more than just fossil fuels for our energy sources?​
blsea [12.9K]

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Fossil Fuels have the ability to pollute and trash our ecosystems. Its better for us to use clean and renewable energy too.

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These substances are all ____. H2O2 Li NaCl O2
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Answer: pure substances.


Explanation:


The given substances are:

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All what surrounds us, which has mass and occupies spaces, is matter. There are two kind of matter: pure substances and mixtures.


Pure substances have a uniform and constant composition. On the other hand, mixtures are combinations of two or more pure substances in  any arbitratry ratio.


Pure substances may be elements or compounds. The elements are the substances conmposed by one only kind of atom. In the list of substances given, Li and O₂ are elements: all the atoms in Li are lithium, and all the atoms in O₂ are oxygen atoms.


Compounds are the chemical combination of two or more different kind of atoms. In the given list H₂O₂ and NaCl are compounds. As you see, H₂O₂ contains atoms of hydrogen and oxygen, chemically bonded, in a fixed ratio (2 atoms of hydrogen by 2 atoms of oxygen). And NaCl has atoms of Na (sodium) and Cl (chlorine), chemicaly bonded, in a fixed ratio (1:1).


There are only 118 known elements and you can find them in any modern periodic table. Therer are virtually infinitely many compounds since many different combinations of the elements can be attained.


Elements and compounds have in common that they are classified as pure substances.


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Which of the following are parts of the excretory system? *
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