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Neporo4naja [7]
3 years ago
8

When performing labratory experiments, which of the following items is ALWAYS necessary to use?

Chemistry
1 answer:
densk [106]3 years ago
3 0
All of the the answers are are correct but a fume hood is more for if you are dealing with chemicals that can produce fumes the are deadly to people
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Identifying Qualitative and quantitative Data
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Answer:

qualitative data :           quantitative data :      

circular in shape            75 colonies ...          

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Explanation:

i got it right :) .

7 0
3 years ago
What is the percent yield of LiCl if I produced 30.85g LiCl and my theoretical yield was calculated to be 35.40g LiCl?
marissa [1.9K]

Answer:

87.15%

Explanation:

To find percent yield, we can use this simple equation

\frac{Actual}{Theoretical} *100

Where "Actual" is the amount in grams actually collected from the reaction, and "Theoretical" is, well, the theoretical amount that should have been produced.

They give us these values, so to find the percent yield, just plug the numbers in.

\frac{30.85}{35.40} *100\\\\ =87.15

So, the percent yield is 87.15%

An easy trick to remember how to do this is just to divide the smaller number by the bigger number and move the decimal back two places. If you have a percent yield greater than 100%, something is wrong in the reaction.

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3 years ago
Which of the following is an example of a hypothesis?
nevsk [136]
The answer would be A.
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How dose heat travel between objects that are touching one another?
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