Which of the following describes a critical component of a “fair test”?

Chemistry

2 answers:

Yuki888 [10]3 years ago

3 0

I think it is the third one because it just makes more sense to me

Bad White [126]3 years ago

3 0

Answer:

A fair test should have a specific methodology for data collection.

Explanation:

A fair test should be carried out without prejudice or bias. This means that the outcome would be accepted and not influenced by the researcher. To achieve this, there must be a specific methodology for data collection to avoid any form of influence.

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Plutonium−239 (t1/2 = 2.41 × 104 yr) represents a serious nuclear waste hazard. if seven half-lives are required to reach a tole

dimulka [17.4K]

The half-life of Plutonium−239, t1/2 is 2.41 × 10⁴<span> yrs

time taken to reach tolerable level = seven half-lives
= 7 x t1/2
= 7 x </span>2.41 × 10⁴ yrs
= 168700 yrs
= 1.687 x 10⁵ yrs

Hence, the period of time that <span>Plutonium-239 must be stored is </span>1.687 x 10⁵ years.

5 0

3 years ago

Read 2 more answers

Jill then wrote the formulas for all the possible compounds that sodium can form with the other ions. What formulas did she writ

sp2606 [1]

Explanation:

Sodium has atomic number of 11 and its electronic configuration is given by:

$[Na]=1s^22s^22p^63s^1$

The nearest stable electronic configuration to sodium is of the neon. So, in order to attain stability of noble gas it will loose its single electron.

$Na\rightarrow Na^++1e^-$

$[Na^+]=1s^22s^22p^63s^0$

Sodium has single valency that is 1.

Let nbe the valency of the ion 'X'

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

$Na_nX_1$