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ohaa [14]
2 years ago
14

2

Chemistry
1 answer:
andrew-mc [135]2 years ago
7 0
5 hope this helps I’m pretty sure it should be right
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A researcher claims that an ancient scroll originated from greek scholars in about 500 bce. a measure of its carbon-14 decay rat
Naddik [55]
The amount of substance present in a certain object with a given half-life in terms of h can be expressed through the equation,

     A(t) = (A(o))(0.5)^(t/h)

where A(t) is the amount of substance after t years and A(o) is the original amount. In this item we are given that A(t)/A(o) is equal to 0.89. Substituting the known values,

     0.89 = (0.5)(t / 5730 years)

The value of t from the equation is 963.34 years.

<em>Answer: 963 years</em>
8 0
3 years ago
What is a chemical change
navik [9.2K]
Isn't a chemical change like something that's not a physical change or physically changed but is something that uses natural chemicals? that's my guess sorry if it's wrong I think I'm wrong though
4 0
3 years ago
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The asthenosphere is the part of the upper mantle just below the lithosphere that os involved in the plate tectonic movement anf
likoan [24]

Answer:C

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3 0
3 years ago
Why do we use the term formula unit for ionic compounds instead of the term molecule? Select all that apply.
VladimirAG [237]

Answer:

A and C

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The term formula unit is use to indicate Simple-Whole Ratios of ions in a compound. KEY WORD! RATIO!

3 0
2 years ago
A pure white crystalline compound was found to melt at 112.5-113.0oC when taken on a melting point apparatus, and on further hea
Sergeeva-Olga [200]

According to the question, the determined melting point of the compound is 112.5-113.0oC. When the solidified compound was retried, the melting point was found to be 133.6-154.5oC. This greater range higher than  112°C is caused by reusing samples leads to errors.

A pure sample is known by its sharp melting point. A pure sample does not melt over a large range. We can see this in the predetermined melting points of the pure sample(112.5-113.0oC).

However, reusing a sample introduces errors because the pure sample may become contaminated leading to a larger and higher range of melting point (133.6-154.5oC) which is far above  112°C.

Learn more: brainly.com/question/5325004

8 0
2 years ago
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