How to revise in just 1 whole day for chemistry combined science is it possible to get a good grade

1 answer:

4 0

it will be hard, but you can do it. Just study given the materials for the course. Understand enthalpy and entropy, and various types of bonding and you'll be fine.

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The chemical reaction shown above takes place in a closed system. What is true about the system while the reaction occurs? A. Th

Ede4ka [16]

Answer: In a chemical reaction, the total mass of the particles in the system stays the same

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side in a chemical reaction.

Every balanced chemical reaction follows law of conservation of mass.

For Example: Formation of water molecule

$2H_2+O_2\rightarrow 2H_2O$

Total mass on reactant side = $[2(2\times 1)+(2\times 16)]=36g/mol$

Total mass on product side = $[2((2\times 1)+16)]=36g/mol$

Hence, in a chemical reaction, the total mass of the particles in the system stays the same

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3 years ago

15. If the moon is 384,400km away. Does it take more than a second for light to travel from the Earth to the moon?

marishachu [46]

Answer:

Yes

Explanation:

The speed of light is about 300 000 km per second, so light takes about 1.28 seconds to travel from the Moon to the Earth.

3 0

1 year ago

Explain what a covalent bond is, what types of elements form covalent bonds and give an example of 2 elements that could bond co

tino4ka555 [31]

Two non metal combined together and form the bond is called covalent bond
Note - yellow color molecules in pictures are non metal elements
example - co2 , so2,

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3 years ago

An atom's tendency is to become stable. What does this mean? A. The electrons all move to one electron shell. B. The atom gains

masya89 [10]

The answer is D. To put it simply, all atom wished to become stable. The only way for that is to obtain an octet structure where the outermost shell would have 8 electrons, thus being full.

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4 years ago

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Do you think the reflected waves would ever return to the airplane that transmitted them? explain

Ket [755]

No, it is very unlikely for that to happen.

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3 years ago

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