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scoray [572]
3 years ago
8

As a car moves, the engine converts energy. The system consists of: the car (including engine and fuel), Earth, and surface of t

he road. Which choice best describes how energy is transformed in the system.
1- As fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and absorbing energy from the environment. The energy absorbed allows parts of the engine to move. The energy from the surroundings is all transformed into chemical and mechanical energy.

2- As the fuel burns, chemical reactions occur within the feud, breaking up molecules, forming new molecules. And releasing energy. The energy released allows part of the engine to move. The chemical energy is all transformed into mechanical energy.

3- As the fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and releasing energy. The energy is released as heat, and allows parts of the engine to move. The chemical energy is transformed into thermal energy.

4- As the fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and releasing energy. The energy released allows parts of the engine to move. The chemical energy is all transformed into thermal and mechanical energy.
Chemistry
1 answer:
katen-ka-za [31]3 years ago
7 0

Answer:

I believe your answer will be 3--

As the fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and releasing energy. The energy is released as heat, and allows parts of the engine to move. The chemical energy is transformed into thermal energy.

Explanation:

Hope this helps you!!!

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The graph of a linear equation may not be a straight line?true or false
grigory [225]

Answer:

false

Explanation:

a linear equation always graphs a straight line

8 0
4 years ago
How much 10.0 M HNO must be added to 1.00 L of a buffer that is 0.0100 M acetic acid and 0.100 M sodium acetate to reduce the pH
Naya [18.7K]

Explanation:

It is given that molarity of acetic acid = 0.0100 M

Therefore, moles of acetic acid = molarity of acetic acid × volume of buffer

            Moles of acetic acid = 0.0100 M × 1.00 L

                                              = 0.0100 mol

Similarly, moles of acetate = molarity of sodium acetat × volume of buffer

                                           = 0.100 mol

When HNO_{3} is added, it will convert acetate to acetic acid.

Hence, new moles acetic acid = (initial moles acetic acid) + (moles HNO_{3})

                                                = 0.0100 mol + x

New moles of sodium acetate = (initial moles acetate) - (moles HNO_{3})

                                        = 0.100 mol - x

According to Henderson - Hasselbalch equation,

           pH = pK_{a} + log\frac{[conjugate base]}{[weak acid]}

             pH = pKa + log\frac{(new moles of sodium acetate)}{(new moles of acetic acid)}

           4.95 = 4.75 + log\frac{(0.100 mol - x)}{(0.0100 mol + x)}

       log\frac{(0.100 mol - x)}{(0.0100 mol + x)}  = 4.95 - 4.75

                                            = 0.20

\frac{(0.100 mol - x)}{(0.0100 mol + x)}  = antilog (0.20)

                                           = 1.6

Hence,    x = 0.032555 mol

Therefore, moles of HNO_{3} = 0.032555 mol

volume of HNO_{3} = \frac{moles HNO_{3}}{molarity of HNO_{3}}

                                = \frac{0.032555 mol}{10.0 M}

                                 = 0.0032555 L

or,                             = 3.25           (as 1 L = 1000 mL)

Thus, we can conclude that volume of HNO_{3} added is 3.26 mL.

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Why are the trade winds in the Southern Hemisphere southeasterly?
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The surface air that flows from these subtropical high pressure belts toward the equator is deflected toward the West in both hemispheres by the Coriolis effect. These winds blow predominantly for the northeast in the northern Hemisphere and from the southwest in the Southern Hemisphere
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Answer:

H2O2

Explanation:

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The structures of proteins are in three dimensions, they are primary, secondary and tertiary structures. The primary structure refers to the sequence of the amino acids in a protein. The amino acids in the primary structure are linked together by peptide bonds.

8 0
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