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slava [35]
3 years ago
15

All of the following are units for pressure except _____. A. Pa B. psi C. atm D. Hg

Chemistry
1 answer:
MA_775_DIABLO [31]3 years ago
6 0

Answer:

B. psi

Explanation:

Pa is Pascal

atm is atmosphere

Hg is Mercury

hope it helps.

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You are asked to weigh approximately 0. 4g of acetylsalicylic acid to the nearest mg. When you enter the data in grams in your l
julia-pushkina [17]

Number of significant figures will be 1.

Given:

weight of acetylsalicylic acid = 0. 4g

Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.

When we convert 0.4g acetylsalicylic acid to mg we get value 400mg

when we convert 400mg to gram we get value of 0.4 gram

Since 0 before a decimal is not significant so there is only one significant figure that is 4.

<h3>How do you determine the number of significant figures?</h3>
  • The zero to the left of a decimal value less than one is meaningless.
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7 0
2 years ago
Which is the most reactive metal and why?​
Gemiola [76]

Answer:

Caesium, the most reactive metal in the periodic table, reacts extremely violently – hence why it can't be demonstrated in a classroom! This can be compared to other common metals, such as iron and copper, which produce no reaction when dropped into water.

Hope this answer is right!

3 0
3 years ago
If half of the moon is always illuminated why does its appearance from earth change?
irina [24]

Answer:

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Explanation:

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What two things combine with oxygen to form ground-level ozone?
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c) NOx and VOC

oxides of nitrogen (NOx) and volatile organic compounds (VOC)

Explanation:

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