CHEMISTRY HIGH SCHOOL

__________ refers to the total energy of a system.

Answers

Answer 1
Answer: The internal energy refers to the total energy of a system. The enrgies are kinetic energy and potential energy of the system that makes up the whole energies of the system.
Answer 2
Answer: Enthalpy refers to the total energy of a system. Enthalpy is basically a thermodynamic unit of measurement that determines the total heat content of a system. This means that all energy is included in the measurement - the energy used to make the system, the energy of the system, and the energy it uses to keep the environment separate from the system.

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What do you think will happen to the ecosystem if all the coral reefs are destroyed?

Answers

Animals that rely on coral for protection and cover, such as grouper, snapper, oysters and clams, would also be negatively impacted. And because this marine life is a vital staple in many peoples' diets, the death of the coral reefs would exacerbate the problem of feeding these groups [source: Skoloff].

Write these chemicals in order starting with the one that turns into gas the easiest. Naphtha, diesel, bitumen, petrol

Answers

naptha! hope i helped

Which of the following best describes what happens when molecular compounds melt? A.) Molecules separate into their component atoms. B.)Molecules move more slowly. C.) Molecules arranged in an irregular pattern change to a regular pattern. D.) Molecules arranged in a regular pattern change to an irregular patter.

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I think the correct answer from the choices listed above is option D. When a molecular compound melts, they undergo the process of phase change from solid to liquid therefore molecules arranged in a regular pattern change to an irregular pattern. Hope this answers the question.

If the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, Cd(NOÀ)¿?

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2x14.01 =28.02 
ans is B

If you have 100.0 grams of carbon and 100.0 grams or iron, which sample will contain more atoms

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first you need to solve for the number of moles in each. 
1 mole of anything = atomic mas of that element (g)

Carbon has an atomic mass of 12.0107
1 mole of Carbon = 12.0107 g

Iron has an atomic mass of 55.845
1 mole of Iron = 55.845 g

now convert each from grams to moles 
(grams of Carbon cancel and you are left with moles of carbon)
100.0 g Carbon x 1 mol Carbon  = 8.326 mol Carbon
       12.0107 g Carbon

(grams of Iron will cancel and you are left with moles of iron)
100.0 g Iron x 1 mol Iron = 1.791 mol Iron
      55.845 g Iron

now we can use avogadro's number to solve for the amount of atoms in each 
1 mol = 6.02x10^23 atoms

8.326 mol Carbonx 6.02 x 10^23 atoms  = 5.012 x 10^24 atoms Carbon
        1 mol Carbon

1.791 mol Iron x 6.02 x 10^23 atoms  = 1.078 x 10^24 atoms Iron
        1 mol Iron

5.012 x 10^24 atoms Carbon > 1.078 x 10^24 atoms Iron

What characteristic is important for plants found in saltwater wetlands?

Answers

Answer : Salinity tolerance

Explanation :

The important characteristics for the plants which are found in salt water wet lands is salinity tolerance.

Salinity tolerance is the salt tolerance of crops in the wet lands which gives maximum salt level that a crop can tolerate without losing its productivity.

Although it may get affected negatively at higher levels of exposure. The salt level is often measured as the soil salinity or else the salinity of the irrigated water.
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