SECOND TERM 2021/2022 HOLIDAY ASSIGNMENT

SUBJECT: CHEMISTRY CLASS SS1

1 (a) Define a salt

(b) The basicity of tetraoxosulphate VI acid is 2. Explain this statement with equation showing

the reaction between the acid and potassium hydroxide

2. Define buffer solution and give two uses of buffer solutions.

3. Explain and give an example each of

(a) Hygroscopy (b) Efflorescence (c) Deliquescence

4. The concentration of hydrogen ion H⁺ in two solutions are:

(a) 1 x 10⁻³moldm⁻³ and (b) 6 x 10⁻⁹moldm⁻³

What is the pH of each solution?

5. (a) Give three crystalline and four non-crystalline allotropes of carbon

(b) Give three differences between the two main crystalline allotropes of carbon.​

Answers

Answer 1


1.

a) Salt: any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation.

Acid + alkali → salt + water

b)

Tetraoxosulfate (VI), SO2−4,SO42−, is the second conjugate base from the dissociation of sulfuric acid, H2SO4.H2SO4. This acid is a diprotic acid and thus can donate two protons in an aqueous solution to form HSO−4HSO4− after the first dissociation and SO2−4SO42− after the second dissociation.

The fact that tetraoxosulfate (VI) is dibasic means in terms of Brønsted-Lowry acid-base theory, the ion can accept two protons, or in other words, the parent acid donates two protons upon dissociation. This can be shown by the equation of the reaction between the parent sulfuric acid and potassium hydroxide where two hydrogens are replaced:

H2SO4+2KOH → K2SO4+2H2O

2. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many systems that use buffering for pH regulation.

For example, blood in the human body is a buffer solution.

Buffer Solutions are used for fermentation in the making of alcohol


I've only answered 1 & 2


Related Questions

formula of sodium chloride, sodium trioxocarbonate (IV), aluminum oxide, ammonium sulphide, zinc hydroxide, zinc tetraoxosulphate (IV), sodium tetraoxosulphate (VI), trioxonitrate (V) acid, water​

Answers

Answer:

The correct answer is Na2CO3. 10H2O

The body is made up of systems that work together so that an organism can survive and grow. The musculoskeletal system contains muscles that move the body. How does the circulatory system help the muscles to function?

A. by transporting carbon dioxide that can be used by the muscles to produce energy

B. by transporting oxygen that can be used by the muscles to produce energy

C. by transporting carbon dioxide that can be used by the muscles for sensing information

D. by transporting oxygen that can be used by the muscles for sensing information

Answers

The circulatory system help the muscles to function by transporting oxygen that can be used by the muscles to produce energy.

What is Circulatory system?

This is the system which is involved in the transportation of nutrients, respiratory gases etc in a living organism.

The heart is the central organ which ensures oxygen is distributed to all parts of the cells for production of energy.

Read more about Circulatory system here https://brainly.com/question/2107209

(40) If a hypothesis is proven correct, a theory is formulated.

True or false

Answers

Answer: False, I believe.

Explanation: If a Hypothesis is proven correct, then another experiment to strengthen that Hypothesis is should be done.

Which type of carbon fixation stores carbon dioxide in acid form? a. c3 b. c4 c. cam d. all of the above

Answers

The type of carbon fixation stores carbon dioxide in acid form is CAM i.e. crassulacean acid metabolism.

What are CAM?

CAM stands for crassulacean acid metabolism in this process photosynsthesis is occured at day time but the exchange of gases takes place at night itself only.

In this carbon fixation process, carbon dioxide is stored in the form of organic acid malic acid and losses carbon dioxide at the night time and by doing this it helps in the storage of water.

Hence option (C) is correct.

To know more about CAM, visit the below link:

https://brainly.com/question/4170802

Answer:

CAM

Explanation:

Yes the correct answer is option C, ( CAM)  I just took the test.

What part of defense would likely be affected if the pathogen contained a mutation in it's pathogen-associated molecular patterns (PAMPs)?

the pathogen would secrete greater amounts of toxins...

the pathogen would not be able to penetrate the host's physical barriers.

the pathogen might not be recognized by the host.

the pathogen would be easily recognized by the host's TLRs.

Answers

Answer:

The pathogen might not be recodnised by the host :)

Here is a link to learn more!!

https://brainly.com/question/13859016

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What amount of alcohol consumed while boating is equivalent to the amount on land.

Answers

Answer:

yes it is

Explanation:

while boating or on the land it is the same amount of alcohol

Answer:

Any amount will be have the same effect on Blood Alcohol Content while boating OR on land .

Explanation:

In another experiment the student turreted 50.0

Answers

Answer:

is this a full question ????

Explanation:

HELP ME RIGHT NOW!!! 100 POINTS PLUS A BRAINLEST!

current experiment; cabbage water vinegar, and baking soda ; (to see pH levels)

Name 1 new related experiments that could be done next to further research
Explain why these experiments would be the ones to do next.

Answers

Answer:

Soap and tomato juice :)

Explanation:

Using different types of pH levels may affect the results, so that is why I think this would be a good experiment to do. :)

Have an amzing day!!

Please rate and mark brainliest!!!

Answer:

Using litmus paper

Explanation:

If an acid is applied, the paper will turn red [pH range : 0 < x < 7]If it's a neutral substance, the paper will not change color [like water] (pH = 7)If a base is applied, the paper will turn blue [pH range : 7 < x ≤ 14]

How may PARTICLES of oxygen ore requried to make 6.7 moles of Carbon Dioxide

Answers

Answer:

0.15 moles

Explanation:

6.7moles x 1 mole co2 over 44.01 g = 0.15 moles

In the chemical formula h2o, which description explains what the 2 represents?.

Answers

H_2O is the chemical formula of compound water.

Here

2 denotes to no of hydrogen atoms as it's after H

In water

There are

2Hydrogen atoms1 Oxygen atoms A lone pair is present over Oxygen atom

What are the most likely dates of the full moon

Answers

February 5, march 7, April 4, May 4

Answer:

C

Explanation:

Answer C    Full moon occurs approx 2weeks after new moon

Predict the sign of delta H for water condensing. Is this reaction spontaneous?

A) + and spontaneous
B) - and uncertain
C) + and uncertain
D) - and spontaneous

Answers

Answer:

A + and spontqneous

Explanation:

i hope this helps.

The enthalpy change of condensation of water is negative and here the entropy change also negative and the process is nonspontaneous.

What is enthalpy change?

The enthalpy change of a reaction or a phase change is the change in heat energy absorbed or evolved. The change in enthalpy is dependant on the nature of process as well on temperature of the system.

Condensation of water is the change of its liquid state into solid state. Thus water freezes to form ice. In this process, the system is getting more ordered structure in the solid state and thus, the entropy of the system decreases means the entropy change is negative.

Now, when converting liquid to solid heat is released by the system. Hence, enthalpy change, delta H is negative. A process becomes spontaneous only f its Gibbs energy is negative.

Here we have both negative entropy and enthalpy so make Gibbs energy negative higher temperature is needed.

Condensation of a substances is taking place at very low temperature and thus gibbs energy become positive. Therefore the process is  nonspontaneous.

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How many grams are in 5.5 moles of H2O

Answers

Answer:

99•g

Explanation:

Well, ONE mole of water has a mass of 18.01⋅g⋅mol−1. and 5.5⋅mol has a mass of approx. 99⋅g.

Explain why you usually can’t use just a single spectral line to confirm the identity of an element.

Answers

You can't usually just use a single spectrum line to confirm the identity of an element because there are cases that the emission line id not clearly defined. When the emission line is very weak compared to surrounding noise, in which case the more datapoints you have to build up confidence for the existence of a particular emission spectra, the better.

help asap i need help

Answers

Answer:

from producers to consumers

Explanation:

Energy is transferred between organisms in food webs from producers to consumers. The energy is used by organisms to carry out complex tasks. The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants

Short answer, don't know but i'm sure the answer is up here

The balanced equation for the aerobic reaction is:

Zn + 2 HCl → ZnCl2 + H2

How much hydrogen gas is produced from 5 g of HCl?

Please show work and be detailed.

Answers

Answer:

1.85 g of hydrogen gas will form!

Explanation:

1. Write the balanced equation.

Zn

+

2HCl

ZnCl

2

+

H

2

2. Calculate the moles of

Zn

.

Moles of Zn

=

30.0

g Zn

×

1 mol Zn

65.38

g Zn

=

0.4589 mol Zn

3. Calculate the moles of

H

2

.

Moles of H

2

=

0.4589

mol Zn

×

2 mol H

2

1

mol Zn

=

0.9177 mol H

2

4. Calculate the mass of

H

2

.

Mass of H

2

=

0.9177

mol H

2

×

2.016 g H

2

1

mol H

2

=

1.85 g H

2

i need help ..........

Answers

Answer:

E

Explanation:

The problem with choices A B C D is that the molecular balance numbers are incorrect. E is the only one correctly balanced. For example in A is balanced as

3Mg + 2H2O ===> 3Mg0 + 2H2

The Mg's are correctly balanced.

So are the hydrogens. But take a look at the 0xygens. There are 2 on the left and 3 on the right. The equation is not balanced correctly. B and C have the same problem. One of elements is not balanced correctly.

Which best describes the forces in the nucleus of a stable atom?
O A. The weak nuclear force is greater than the electrostatic force.
O B. The electrostatic force is greater than the strong nuclear force.
O c. The weak nuclear force balances out the strong nuclear force.
O D. The strong nuclèar force balances out the electrostatic force.

Answers

Best describes the forces in the nucleus of a stable atom is the strong nuclear force balances out the electrostatic force.

The center region of an atom, which is composed of two different types of particles, is known as the atomic nucleus. Protons with positive charges and neutrons with no charges are present. Because of the strong electrostatic attraction between positively charged protons, atomic nuclei should be unstable, however they occasionally remain stable for more than a billion years.

The stability of nuclei suggests that protons and neutrons are attracted to one another by an attractive force. The strong nuclear force, also known as the residual strong force, is responsible for every individual atomic nucleus' stability. Neutrons and protons are held together by this basic force of nature. It is used to explain the atom's and its nucleus' stability, which is otherwise puzzling. It can be used to explain the origin of all atoms and, consequently, the origin of all known simple and complex molecules.

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What does net force depend on

Answers

Answer:

net force depends upon the object and also the mass of that object

Answer:The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.

Explanation:

If a gas has a volume of 1.25 l at a temperature of 300 k, what will the volume change to if the container is cooled to 200k

Answers

The volume of the gas when the container is cooled from a temperature of 300 K to 200 K is 0.83 L

Charles' law

Charles' law states as follow:

V₁ / T₁ = V₂ / T₂

Where

V₁ is the initial volume T₁ is the initial temperature V₂ is the new volume T₂ is the new temperature

How to determine the new volume

From the question given above, the following data were obtained

Initial volume (V₁) = 1.25 LInitial temperature (T₁) = 300 KNew temperature (T₂) = 200 KNew Volume (V₂) =?

V₁ / T₁ = V₂ / T₂

1.25 / 300 = V₂ / 200

Cross multiply

300 × V₂ = 1.25 × 200

Divide both side by 300

V₂ = (1.25 × 200) / 300

V₂ = 0.83 L

Learn more about gas laws:

https://brainly.com/question/6844441

___ discovered the actual force of g

Answers

I think the answer will be:

Sir isaac newton.

The mass and distance between two objects affects the strength of gravitational force.
What factors do you think might affect the strength of the electric force?

Answers

Conductivity and Distance

Need help! Will give brainliest & 50 points.

What happens to iron when it reacts with acid?

Answers

Answer:

Iron will disolve in acid. The acid eats away at the iron. :)

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Which is the best definition of rate-determining step?

a) an elementary step that often occurs in the reaction mechanism

b) the elementary step that limits how fast the overall reaction proceeds

c) an elementary step that is used to derive a rate law

d) the unimolecular step in a reaction mechanism

Answers

Answer:

The correct answer is B. Give me Brainliest

name the follwing compound, KBr​

Answers

Answer:

Potassium bromide

Explanation:

Is Iron rusting a physical, or chemical change?

Answers

Answer:

the answer is chemical change because the act of rusting changes the substance of iron

Explanation:

what determines the boundaries of a water shed

Answers

The boundary of a watershed is defined by the highest elevations surrounding a lake or river segment. A drop of water falling outside of the boundary will drain to another watershed.

Answer:

The boundary of a watershed is defined by the highest elevations surrounding a lake or river segment. A drop of water falling outside of the boundary will drain to another watershed.

Explanation:

what are the products for the following equation?

ZnBr2 + F2 -> ​

Answers

Answer:

The products to ZnBr2 + F2 -> Znf + Br2

When we balance this equation we get the following:

2ZnBr2 + F2 -> 2Znf + 2Br2

Hope this helps !!!

what are the units on avogardo’s number

Answers

Answer:

I believe they are electrons, atoms, ions, or molecules.

Explanation:

Is apologize if it is incorrect-

I hope it helps! Have a great day!

Muffin~

Answer:

Units:

electrons

ions

atoms

molecules

Explanation:


I hope it helps!
Have a great day!

<3

Calculate the number of atoms in 5 moles H₂O.

Answers

Answer:

90.35 × 10²³ atoms

Solution:

1 molecules of H20 contains 3 atoms,.

And we know that one mole of any molecule contains 6.023 × 10²³ atoms from Avogadro's number,

hence 5 moles of H20 will contain = 5× 6.023 × 10²³ × 3 atoms = 90.35 × 10²³ atoms!

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