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kirill115 [55]
2 years ago
15

A. 8.15 b. 8.13 c. 8.23 d. 8.135

Chemistry
2 answers:
snow_tiger [21]2 years ago
7 0

Answer:

The answer is a) 8.15

Explanation:

Hi, when going to inform a volume from a graduated test tube it's important to read the medition at the bottom point of the valley form by the liquid (by effect of the capillarity).

<u>If not, that will lead to wrong medition.</u>

Also, each line between the 9 and the 8 represents 0.1 ml, so the medition is higher than 8.1 and lower than 8.2.

Due to the human eye precision and the degree of graduation of the tube it's not correct to asume specific values such as 0.13 or 0.135, becuase you can never know.

In conclusion, if the medition falls between to lines, it's correct to inform the half point.

For example, between:

  • 8.1 and 8.2 → 8.15
  • 7.4 and 7.5 →7.45
  • 5.8 and 5.7 → 5.75

ahrayia [7]2 years ago
6 0

Answer:

the answer is c

Explanation:

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Heat and pressure deep in the earth change shale to slate. Why does this happen?
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Explanation:

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3 years ago
How do I solve the following word problem: The half-life of Phosphorus - 32 is 14.3 days. It is used to study a plant's use of f
BaLLatris [955]

Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay.

We have the following equation representing the half-life decay:

A=A_o\times2^{(-\frac{t}{t_{half}})_{}_{}}

A is the resulting amount after t time

Ao is the initial amount = 50 mg

t= Elapsed time

t half is the half-life of the substance = 14.3 days

We replace the know values into the equation to have an exponential decay function for a 50mg sample

A=\text{ 50 }\times2^{\frac{-t}{14.3}}

That would be the answer for a)

To know the P-32 remaining after 84 days we have to replace this value in the equation:

\begin{gathered} A=\text{ 50 }\times2^{\frac{-84}{14.3}} \\ A=0.85\text{ mg} \end{gathered}

So, after 84 days the P-32 remaining will be 0.85 mg

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1 year ago
What scientific instrument is capable of measuring very small masses?​
marusya05 [52]

Answer:

Electronic balances.

Explanation:

5 0
3 years ago
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