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3 years ago

2. If an object is buoyant, then it will (3 Points) fioat sink

Chemistry

1 answer:

velikii [3]3 years ago

6 0

Answer: If an object is buoyant, then it will float

Explanation:

Buoyancy is the term which describes a type of force which is also known as the upthrust force. This is an upward force upward force exerted by a fluid that opposes the weight of an immersed object.

The objects which are lighter than water easily float on the water due to the existence of this force and the objects which are heavier than water sink in the water due to the existence of this force.

Thus if an object is buoyant, then it will float.

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A sample of gas at 25ºc has a volume of 11 l and exerts a pressure of 660 mm hg. how many moles of gas are in the sample?

san4es73 [151]

The moles of the gas in the sample is 0.391 moles

calculation
by use of ideal gas equation, that is Pv=nRT
where n is number of moles
P(pressure)= 660 mmhg
R(gas constant) = 62.364 l.mmhg/mol.K
T(temperature)= 25 +273 = 298 k

by making n the subject of the formula

n= Pv/ RT

n is therefore= (660mm hg x11 L)/( 62.364 L.mmhg/mol.k x298 K) = 0.391 moles

5 0

4 years ago

Calculate the % dissociation of 0.10 M solution of acetic acid (pKa = 4.75)

madreJ [45]

Given :

Molarity of acetic acid solution, M = 0.10 M.

pKa of acetic acid, pKa = 4.75 .

To Find :

Percentage dissociation of 0.10 M solution of acetic acid.

Solution :

We know, $pK_a = -log\ K_a$

Taking antilog both side, we get :

$K_a = 1.78\times 10^{-5}$

Since, acetic acid has 1 hydrogen atom to loose , so it is a monoprotic acid.

Now, percentage dissociation of monoprotic acid is given by :

$\alpha = \sqrt{\dfrac{K_a}{C}}\\\\\alpha =\sqrt{ \dfrac{1.78\times 10^{-5}}{0.1}}\\\\\alpha = 0.0133\times 100 = 1.33 \%$

Hence, this is the required solution.

3 0

3 years ago

When does hydrogen first begin to fuse into helium in the star formation process?

valentina_108 [34]

Step one of the Hydrogen fusion process helium a nucleus of Deuterium is formed from two protons with the emission of an antielectron and a neutrino.

The fundamental Hydrogen fusion cycle includes 4 Hydrogen nuclei and two electrons and yields a Helium nucleus, two neutrinos and six photons. The principle series phase is the stage in development where the center temperature reaches the point for the fusion to begin. in this manner, the protons of hydrogen are converted into atoms of helium.

If the star is big sufficient to fuse hydrogen atoms into helium, it's going to enter the phase that our solar is in, referred to as the primary sequence section. a celebrity will enjoy most of its existence in the major series section. At this point nuclear fusion is turning hydrogen into helium.

A star isn't always absolutely a star until it is able to fuse hydrogen into helium. before that, they are called Protostars. A protostar is fashioned as gravity begins to tug the gases together right into a ball. This process is referred to as accretion.

Learn more about hydrogen here:-brainly.com/question/19813237

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8 0

2 years ago

Methane versus carbon dioxide are very important greenhouse gases. However, methane can retain and release about ____ times more

elixir [45]

The blank space in the task statement should be filled with 25 as methane can retain 25 times more heat than carbon dioxide.

<h3>Heat Retention: Methane and Carbon dioxide</h3>

Methane, carbon dioxide amongst other gases are important greenhouse gases which allows the Earth retain it's heat in order for it to be habitable.

Methane can retain and release about 25 times more heat than Carbon Dioxide although Methane emissions are lower compared to Carbon Dioxide.