What investigations never involve hypotheses?

2 answers:

5 0

The correct answer is a descriptive investigation.

An investigation which does not involve hypotheses called descriptive investigation.
Hypotheses are termed as scientific hypotheses and require that one can test it. In hypothesis, previous observation can not satisfactorily be explained with an available scientific theory.
Working hypotheses are being proposed for further research.

Hatshy [7]3 years ago

5 0

The investigation that never involves a hypothesis is: a descriptive investigation. these investigations are used when little is known about a topic so you can't form a hypothesis. i hope this helps!

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How many grams are in 4.23E44 particles of PbO2

ASHA 777 [7]

1.679 × 10²³ g of PbO₂ is present in 4.23×10⁴⁴ particles of PbO₂.

<u>Explanation:</u>

First the number of particles is converted into moles by dividing it by the Avogadro's number and then moles multiplied by the molar mass, we will get the mass of PbO₂ in grams.

4.23×10⁴⁴/ 6.022×10²³ = 7.02×10²⁰ moles

Now we have to multiply this by the molar mass of PbO₂, that is 239.2 g/mol, we will get the mass in grams.

7.02×10²⁰ moles × 239.2 g/mol = 1.679 × 10²³ g of PbO₂

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