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Trava [24]
3 years ago
6

What are the components needed in order for an experiment to be valid

Chemistry
1 answer:
liubo4ka [24]3 years ago
3 0

he components needed in order for an experiment to be valid is a hypothesis, a control, and variables.

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What is the charge of an atom's nucleus of an atom has 20 protons, 23 neutrons, and 18 electrons?
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Answer:

It would have a charge of +2.

Explanation:

A proton has a charge of +1, an elctron has a charge of -1, and a neutron has a charge of 0. Ignore the neurons since they have a charge of 0. Since there are 20 protons and 18 electrons (20-18), the overall charge of the atom is +2.

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3 years ago
two perfumes A and B were released at the same time and you are standing 7.5metres away from both of them.molarmass of perfume A
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17.40 sec is the time will take to smell second perfume after diffusion takes place

Acc. to Graham's law of Diffusion

Diffusion of Gas inversely proportional to square root of its Molecular mass.

<u>rb (Perfume B)</u>

ra(perfume A)

= \sqrt{\frac{Ma}{Mb} } its equation (1)

Give molar mass of Perfume A = 275 g/mol

molar mass of Perfume B= 205g/mol putting value in (1)

» \frac{rb}{ra}=\sqrt{\frac{275}{205} }

\frac{rb}{ra} =1.16<em> its eq (2)</em>

» Perfume B will defuse 1:16 times faster than perfume A.

Hence, perfume B will be first smelled by Person.

Sf Equal volume V of two goes diffuse in t1 and t2 sec. respectively ton

\frac{ra}{rb}=\frac{tb}{ta}

Now,, from eq(2) toto

1/1:15 = \frac{tb}{ta}

ta

Given tb =the smell of Perfume B as it diffuse faster  

ta= 1.15 x 15 see  

=ta2=17.40 sec

Learn more about diffuse here

brainly.com/question/3266850

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1 year ago
Which weighs more 10g of iron or 10g of water
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Neither. They are both 10 grams so they weigh the same.

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