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Helga [31]
3 years ago
15

Which of the following choices must occur during all chemical changes

Chemistry
2 answers:
ELEN [110]3 years ago
7 0
It would be C! An energy change. Usually it changes heat - could be less or more.
I hope all is well, and you pass! Good luck, rockstar! You got this. (:
Aleksandr [31]3 years ago
4 0
Nooooo it's not c it's b
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Please help, chemistry is kicking me!
Natali [406]

Answer:

Sorry I would bu that looks so hard

Explanation:

5 0
3 years ago
35mL of acid with an unknown concentration is titrated to completion using 63mL of 3.0 MNaOH.
siniylev [52]

Answer:

5.4 M.

Explanation:

  • At complete neutralization: It is known that the no. of millimoles of acid equal that of the base.

<em>(MV)acid = (MV)NaOH</em>

M of acid = ??? M, V of acid = 35.0 mL.

M of NaOH = 3.0 M, V of NaOH = 63.0 mL.

∴ M of acid = (MV)NaOH / (V)acid = (3.0 M)(63.0 mL)/(35.0 mL) = 5.4 M.

4 0
3 years ago
Explain why we did not see distinct lines (like on an emission spectrum) when the metal salts were burned.
marysya [2.9K]

Actually when we burn metal salts, we cannot actually really see distinct lines to appear because in reality, they are not really visible to the human eye. There is only a certain range of wavelength of light that our eyes can see.

To state in other way, some metal salts will give off light which has wavelengths that are outside of the visible region of the electromagnetic spectrum.<span> </span>

6 0
3 years ago
If 3.66•10^23 molecules of a substance have a mass of 24.31g, what is the molar mass of the substance?
BlackZzzverrR [31]
Answer is a I took the quiz
3 0
2 years ago
Read 2 more answers
A sealed helium balloon with an internal pressure of 1.00 atm and a volume of 4.50 L at 293 K is moved. What volume will the bal
bixtya [17]

Answer:

6.48 L

Explanation:

From the question,

Applying

PV/T = P'V'/T'......................... Equation 1

P = initial pressure of the helium balloon, V =  Initial volume of the balloon, T = Initial temperature of the balloon, P' = Final pressure of the balloon, T' = Final temperature of the balloon, V' = Final volume of the balloon.

make V' the subject of the equation

V' = PVT'/P'T......................... Equation 2

Given: P = 1 atm, V = 4.5 L, T' = 253 K, T= 293 K, P' = 0.6 atm

Substitute these values into equation 2

V' = (4.5×1×253)/(0.6×293)

V' = 1138.5/175.8

V' = 6.48 L

8 0
3 years ago
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