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butalik [34]
3 years ago
8

Ten lab safety rules

Chemistry
1 answer:
Bogdan [553]3 years ago
4 0
Don't touch your eyes.

Never taste-test unless the teacher tells you to.

Do not touch anything without directions.

Wear safety goggles. 

Wash your hands after each experiment.

Wear proper lab clothes.

Do not mishandle lab equipment.

Clean up your workplace.

Act serious; no horseplay!

Report accidents to the teacher right away!


Have a great day, scholar! 
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since an element always has a different number of protons, the mass can indicate how many neutrons are in an isotope
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At a festival, spherical balloons with a radius of 280. Cm are to be inflated with hot air and released. The air at the festival
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Answer:

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Hello! Let's solve this!

Data needed:

Enthalpy of propane formation: 103.85kJ / mol

Specific heat capacity of air: 1.009J · g ° C

Density of air at 100 ° C: 0.946kg / m3

Density of propane at 100 ° C: 1.440kg / m3

First we will calculate the propane heat (C3H8)

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m = Q / c delta T = (7.08068 * 10 ^ 6 J) / (1.009J / kg ° C * (100-25) ° C) =

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V = 4/3 * pi * r ^ 3 = 4/3 * 3.14 * 1.4m ^ 3 = 11.49m ^ 3

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