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AleksAgata [21]
2 years ago
13

Which evidence is an indication that a chemical reaction has occurred?

Chemistry
1 answer:
Luden [163]2 years ago
8 0

Answer:

  • Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

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What is the formula for flow rate?
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3 years ago
If a diatomic molecule has a vibrational force constant of k=240 kg s-2 and a reduced mass of 1.627x10-27 kg, its vibrational fr
asambeis [7]

Answer:

2040 cm-1

Explanation:

The vibrations frequency is obtained from;

v=1/2πc √k/μ

Where;

k= force constant = 240kgs-2

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c= speed of light= 3×10^10cms-1

v= 1/2×3.142×3×10^10√240/1.627×10^-27

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v= 20.4×10^2

v= 2040 cm-1

8 0
3 years ago
According to the selection, what is the main weakness of the tortoise?<br>​
Agata [3.3K]

Answer:

Nose

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Because every time I touch it's nose, it will hide itself into the shell faster than other places

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