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MatroZZZ [7]
3 years ago
12

I need help with lab safety help plzzzz

Chemistry
1 answer:
bixtya [17]3 years ago
6 0

1.) googles, and the second is either gloves or a lab coat.

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The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that
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the molecules move more quickly and their average kinetic energy decreases :D

Explanation:

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What must ALWAYS be used to convert between quantities of two different chemical substances?
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Balanced equations and mole ratios

In general, mole ratios can be used to convert between amounts of any two substances involved in a chemical reaction.

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A _____ is a place where magma reaches Earth's surface to become lava, which can come out of an opening called a _____. A. crate
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D. volcano, fissure :)
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Which scientist explained why binary stars change colors
Vinvika [58]

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This is because of scintillation ("Twinkling") as the light passes through the atmosphere of the Earth. As the air moves in and out, the starlight is refracted, often different colors in different directions. Because of this "chromatic abberation," stars can appear to change colors when they are twinkling strongly.

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3 years ago
If I need 2.2 moles of CO2 , and I have excess Fe2O3 , how many moles of C do I need?
olchik [2.2K]

Answer:

0.733 mol.

Explanation:

  • From the balanced equation:

<em>2Fe₂O₃ + C → Fe + 3CO₂,</em>

It is clear that 1.0 moles of Fe₂O₃  react with 1.0 mole of C to produce 1.0 mole of Fe and 3.0 moles of CO₂.

  • Since Fe₂O₃ is in excess, C will be the limiting reactant.

<u><em>Using cross multiplication:</em></u>

1.0 mole of C produces → 3.0 moles of CO₂, from the stichiometry.

??? mole of C produces → 2.2 moles of CO₂.

∴ The no. of moles of C needed to produce 2.2 moles of CO₂ = (1.0 mole of C) (2.2 mole of CO₂) / (3.0 mole of CO₂) = 0.733 mol.

6 0
3 years ago
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