3 years ago

How do scientists test their ideas

Chemistry

2 answers:

blondinia [14]3 years ago

5 0

Answer:

They test it using the scientific method.

BigorU [14]3 years ago

5 0

By actually testing the ideas

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3 years ago

1. At room temperature, air is usually a (solid, liquid, gas).

kirza4 [7]

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2 years ago

each element is designated by its __________ which is usually from the first letters of the elements name

klemol [59]

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3 years ago

How many moles are present in

olasank [31]

Answer: (a) There are 0.428 moles present in 12 g of $N_{2}$ molecule.

(b) There are 2 moles present in $12.044 \times 10^{23}$ particles of oxygen.

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(a). The mass of nitrogen molecule is given as 12 g.

As the molar mass of $N_{2}$ is 28 g/mol so its number of moles are calculated as follows.

$No. of moles = \frac{mass}{molar mass}\\= \frac{12 g}{28 g/mol}\\= 0.428 mol$

So, there are 0.428 moles present in 12 g of $N_{2}$ molecule.

(b). According to the mole concept, 1 mole of every substance contains $6.022 \times 10^{23}$ atoms.

Therefore, moles present in $12.044 \times 10^{23}$ particles are calculated as follows.

$Moles = \frac{12.044 \times 10^{23}}{6.022 \times 10^{23}}\\= 2 mol$

So, there are 2 moles present in $12.044 \times 10^{23}$ particles of oxygen.

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3 years ago

During a storm, a tree fell over into a river. What might happen to this tree?

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Break down in to tiny prices as the water hit the tree

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