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Pachacha [2.7K]
3 years ago
7

Which is characteristic of reliable experimental results?

Chemistry
1 answer:
storchak [24]3 years ago
7 0

Answer:

B. The data were reproduced by other scientists using the same experimental methods.  

Explanation:

One of the features of reliable experimental results is their reproducibility — other scientists must be able to produce them.  

A. is wrong. An experiment that is designed to prove a hypothesis is biased.

C. is wrong. A conclusion based on a single experiment is suggestive but not conclusive. It takes a number of experiments to provide a strong statistical relation between the variables.

D. is wrong.  The data may support a conclusion that the they reached using logic and critical thinking, but there may still be a flaw in the thinking, which other scientists can point out.  

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Answer: -

²²³Ra is the daughter nuclide produced when ²²⁷Th undergoes alpha decay

Explanation: -

When alpha decay occurs, the mass number of the parent decreases by 4 and the atomic number decreases by 2.

Mass number of ²²⁷Th =227

Atomic number of ²²⁷Th = 90

Mass number of daughter = 227 - 4 = 223

Atomic number of daughter = 90 - 2 = 88

88 is the atomic number of Ra Radium.

Thus the daughter is ²²³Ra

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