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3 years ago

Increasing the temperature increases the vaporization rate of a liquid because the excess energy is used to break covalent bonds

Chemistry

1 answer:

igor_vitrenko [27]3 years ago

4 0

Answer:

False

Explanation:

False. The molecules of liquid are hold in the liquid state due to intermolecular forces or Van de Waals forces , without affecting the molecule itself and its atomic bonds (covalent bonds). When the temperature increases the kinetic energy of the molecules is higher , therefore they have more possibilities to escape from the attractive intermolecular forces and go to the gas state.

Note however that this is caused because the intermolecular forces are really weak compared to covalent bonds, therefore is easier to break the first one first and go to the gas state before any covalent bond breaks ( if it happens).

A temperature increase can increase vaporisation rate if any reaction is triggered that decomposes the liquid into more volatile compounds , but nevertheless, this effect is generally insignificant compared with the effect that temperature has in vaporisation due to Van der Waals forces.

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What is inside the nucleus of a cell and what is <br> its purpose.

Andrej [43]

Answer:The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.

Explanation:

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3 years ago

What is acid rain?

zloy xaker [14]

THE RAIN OR PRECIPITATION WHICH IS ACIDIC IN NATURE IS CALLED ACID RAIN. WET AND DRY DEPOSITIONS ARE THE TWO TYPES OF ACID RAINS.UNIVERSAL INDICATOR IS USED TO DETERMINE COLOUR CHANGE AND HOW ACIDIC AND BASIC IS THE SOLUTION.

Explanation:

The rain which is acidic in nature is called acid rain. It is a precipitated form that contains acidic components such as sulphuric acid or nitric acid. The acid rain is of two types i.)wet deposition ii.)dry deposition

Wet deposition means the acid rain will be of wet form. Dry deposition means the acid rain contains dust,gasses, rain, snow, fog and hail.

Sulphuric dioxide and nitric oxides mix with water, oxygen and other chemicals in the air and becomes sulphuric acid and nitric acids that mix with precipitation and fall on to the ground.the precipitation is said to be acidic when its ph is below 5.2.

The different polyatomic ions that form acids are H+ and SO4-2 and H+ cation and NO3- anions.

A universal indicator is a mixture of indicators which show a colour change in a solution, which interprets how acidic or basic a solution is. A universal indicator can be in paper form or present in a form of a solution.The colours from yellow to red indicate an acidic solution, colours blue to violet indicate bases and green colour indicates that a solution is neutral.

8 0

4 years ago

aleksklad [387]

Answer:

<h3>The answer is 41.05 %</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

$P(\%) = \frac{error}{actual \: \: number} \times 100\% \\$

From the question

actual density = 0.95 g/mL

error = 0.95 - 0.56 = 0.39

So we have

$p(\%) = \frac{0.39}{0.95} \times 100 \\ = 41.0526315...$

We have the final answer as

Hope this helps you

4 0

4 years ago

Define molecular mass. Calculate the molecular mass of calcium carbonate<br> and nitric acid.

irinina [24]

Answer:

HNO₃ =63.0147 g/mol

CaCO₃ = 100.088 g/mol

Explanation:

Molecular mass:

It is the sum of all the atomic masses of the atoms of elements present in a molecule.

For example:

The formula of CaCO₃:

Calcium carbonate consist of one atom of calcium, one atom of carbon and three atoms of oxygen. Thus, its molecular mass would be,

CaCO₃ = 40.078 × 1 + 12.01×1 + 16.00×3

CaCO₃ = 40.078 + 12.01+ 48

CaCO₃ = 100.088 g/mol

The formula of HNO₃:

Nitric acid consist of one atom of hydrogen, one atom of nitrogen and three atoms of oxygen. Thus, its molecular mass would be,

HNO₃ =1.008 × 1 + 14.0067 ×1 + 16.00×3

HNO₃ = 1.008 +14.0067 + 48

HNO₃ =63.0147 g/mol

5 0

4 years ago

Given the equation representing a reaction:H2(g) + I2(g) → 2HI(g)Which statement describes the energy changesthat occur in this

Korvikt [17]

The given question is incorrect, here is a complete question.

Given the equation representing a reaction:

$H_2(g)+I_2(g)\rightarrow 2HI(g)+Energy$

Which statement describes the energy changes that occur in this reaction?

(1) Energy is absorbed as bonds are formed, only.

(2) Energy is released as bonds are broken, only.

(3) Energy is absorbed as bonds are broken, and energy is released as bonds are formed.

(4) Energy is absorbed as bonds are formed, and energy is released as bonds are broken.

Answer : The correct option is, (3) Energy is absorbed as bonds are broken, and energy is released as bonds are formed.

Explanation :

Bond energy : It is defined as the amount of energy required to break a molecules into its component atoms.

At the time of bond formation, the energy is released and at the time of bond breaking, the energy is absorbed.

In the chemical reaction, when the energy is shown in product side that means the energy is released.

In the chemical reaction, when the energy is shown in reactant side that means the energy is absorbed.

Hence, the correct option is, (3)

8 0

3 years ago