CHEMISTRY MIDDLE SCHOOL

Why can't you change the subscripts in a formula in order to balance a chemical equation?

Answers

Answer 1
Answer: The subscripts determine what the chemicals are, you have to change the amount of the reactants/products rather than change what the reactants/products actually are
eg O2 is oxygen gas, if you wanted 4 of them to balance it it would have to be 2 O2 otherwise it wouldnt be oxygen gas any more :)
Answer 2
Answer:

Answer: you cannot change the subscripts in a formula in order to balance a chemical equation because the subscripts indicate the number of each kind of atom in the formula,


Each compound has an invaraible chemical formula which tells how many atoms of every kind constitute the compound.


Varyng the subscripts is a modification of the chemical formula, meaning that you end up with a different compound.


On the other hand, by varying the coefficients, you only modifiy the number of unit formulas (number of molecules of the compound) that intervene in the reaction, which is what you want to indicate by balanceing reactants and products.

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What is a light-year? A.
the distance light travels in one earth year

B.
the distance light travels from the sun to the earth

C.
the distance light travels in one orbit of the moon

D.
the time it takes light to travel across the universe

Answers

The answer would be A. The distance light travels in one earth year. 
i think it is B the distance light travels from the sun to the earth 

A closed container is filled with oxygen. The pressure in the container is 205 kPa
What is the pressure in millimeters of mercury?
Express the pressure numerically in millimeters of mercury.

Answers

Answer:

so pressure in millimeter Hg will be 3016.5 mm Hg

Explanation:

Some land plants have evolved specialized vascular tissues that have allowed them to thrive on land. The developement of these structures was necessary becauseLand plants need to extract water from the ground and move it to the other structures of the plant.
Land plants need to be tall and the vascular tissues are what provide rigidity to the plant’s cells.
Land plants need to photosynthesize and the vascular tissues is where this process occurs.
Land plants don’t really need these structures as they can absorb water from the air through their leaves.

Answers

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Which one is often used in magnets gold or cobalt?

Answers


Cobalt is often used because it react to magnets while gold does not react to magnets.
It is cobalt because gold doesnt have an effect on magnet so it is the only logical explanation

Which items are minerals or contain minerals? Check all that apply.asap please:)
-lawn fertilizer

-topsoil

-a diamond necklace

-a copper electrical wire

-a cellular phone

Answers

Answer:

Hey dude....

Explanation:

This is ur answer.....

Check all because all of them contain minerals.....

Hope it helps!

Brainliest pls!

Follow me! :)

Answer:

lawn fertilizer, topsoil, and a diamond necklace

Explanation:

lawn fertilizer and topsoil are coming out of the ground, therefore some amount of minerals will be in them, such as iron added to it to make whatever its going on grow stronger.

a diamond necklace is a jewel that is coming out of the ground. it is categorized as a raw mineral.

I'm not 100 percent sure about the copper wire and the cell phone.

I do belive copper is a mineral.

Why is water considered a renewable resource?

Answers

Answer:

Water is a renewable resource because it evaporates out of the oceans to clouds, which generate rain falling on the land. The water then runs into rivers and dams where it is used and the waste is partially cleaned before it makes its route to the sea, where the cycle begins again.

Sample Response: Sunlight is always available in nature for us to use and it cannot be used up.
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