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Olin [163]
3 years ago
15

A section of a topographic map is shown below.

Chemistry
1 answer:
Bezzdna [24]3 years ago
5 0

Answer:

40

Explanation:

120 - 80 = 40

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When a test instrument is calibrated, does its accuracy, precision, or reliability improve?
My name is Ann [436]

The answer is accuracy.

That is when a test instrument is calibrated, its accuracy is improved. That is the result comes more close to what it is.

The other factor will not be improved that is its reliability and precision remains the same.

So the answer is accuracy is improved when a test instrument is calibrated.

8 0
4 years ago
If 28 mL of 6.2 M H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?
Naddika [18.5K]

Answer:

The answer is 30 g of sodium hydrocarbonate

Explanation:

This is a acid-base reaction, so in order to neutralise the spilled acid, the mol of spilled acid should be calculated.

M = n / V => n = M x V = 0.028 x 6.2 = 0.1736 mol

Since 1 mol of sulfuric acid generates 2 mol of H⁺, so the mole of H⁺ is 0.3472 mol or 0.35 mol with two significant figures.

To neutralized the acid, we need at least the same mole of base, so we need at least 0.35 mol of NaHCO₃, which can be converted to its mass at 29.4 g.

Since the answer need to be expressed in two significant figures and also need to make sure to neutralize all the acid, so we will use a little excess base. The answer is 30 g.

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3 years ago
How many atoms are in the outer-most shell in order for it to be stable?
aksik [14]

Answer:

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Got it from siri lol :) Have a good day.

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I need help on the question will mark brainliest!!
slava [35]

Answer:

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Explanation:

hope this is helpful

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3 years ago
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tensa zangetsu [6.8K]

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