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Answer

c. Litmus Is red phenolphthalein is colorless

Explanation

A solution with a pH of 3 is acidic. The main use of litmus is to test whether a solution is acidic or basic, blue litmus turns red under acidic conditions, and red litmus turns blue under basic or alkaline conditions. Phenolphthalein is often used as an indicator in acid–base titrations. phenolphthalein, it turns colorless in acidic solutions and pink in basic solutions.

Therefore, the correct option for a solution with a pH of 3 is:

c. Litmus Is red phenolphthalein is colorless

Answer:

Explanation:

Magnification = 20  * 80

1600

Answer:

They have two valence electrons and enter into reactions where they can donate their two valence electrons

Explanation:

Here, we want to predict the number of valence electrons

The elements belong to the group 2 of the periodic table

Elements in the periodic table are placed in groups based on the number of valence electrons they have

It is expected that elements in group 2 of the periodic table have 2 valence electrons

Their reactivity is that, they react with other atoms by donating this two valence electrons. They then achieve the electronic configuration of the noble gas in the last period

Answer:

1.)3.33045

2.)0.02550535714

3.)53.21

4.)26.56

5.)6.72672

6.)3.351

7.)843750

8.)227376.25

9.)0.00172776

10.)8.9577346e+33

Explanation:

Answer:

spring

Explanation:

The frequency of a wave is  2.80 × 10¹⁸  Hertz.  The wavelength is 0.10 nm and energy of this wave is  2.80 × 10¹⁸ .

Given that :

The frequency of a wave, v = 2.80 × 10¹⁸ Hz

wavelength = ?

formula for the wavelength is given as follows :

λ = c/ v

c = speed of light

λ = 3 × 10⁸ m/s /  2.80 × 10¹⁸ s⁻¹

λ = 1.07 × 10⁻¹⁰ = 0.10 nm

Energy of wave = h v

h = planks constant

E = 6.626 × 10⁻³⁴ J.s × 2.80 × 10¹⁸  s⁻¹

E = 18.55 × 10 ⁻¹⁶ J

Thus, The frequency of a wave is  2.80 × 10¹⁸  Hertz.  The wavelength is 0.10 nm and energy of this wave is  2.80 × 10¹⁸ .

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The statement the genetic code of all living organisms is universal explains why some microorganisms have the ability to repair a malfunctioning gene by using the human version of the gene (Option C).

The genetic code is a set of instructions to encode protein by using specific triplets of nucleotides or codons, which indicate particular amino acids that will be added during translation.

Therefore, with this data, we can see that the genetic code is a group of instructions to produce proteins that are conserved in the tree of life.

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Answer

Ala-Ala-Thr-Ala-Thr

Procedure

We will use the genetic code in the table below to solve this question.

Every three consecutive letters need to be matched with the given code

A good strategy s to split the sequence as follows: GCC-GCG-ACC-GCU-ACU

After matching, we have:

Ala-Ala-Thr-Ala-Thr

We are given the liters and molarity of the solution. To find grams we must take into account the definition of molarity. Molarity is defined as:

Now, we find the moles of solute:

Now, to convert these moles to grams we must multiply the moles by the molar mass of Ca(NO3)2. Molar mass Ca(NO3)2 is 164.10g/mol.

So, the grams will be:

Answer: There are present 394grams of Ca(NO3)2

Answer:

Explanation:

Here, we want to get how the final digit in a measurement is obtained

Mathematically, the final digit can be obtained by estimation

Hence, we say that the value is uncertain

The final digit is obtained by a mark or between the last mark and the next mark in a measurement

Thus, we call this value uncertain since it is estimated

It's important to know that the reaction must have the total mass involved before and after due to the law of conservation of mass. This means that the total mass number of the left side of the reaction must be equal to the right side. So, we have the following

Notice that 235 is the mass number of U, 1 is the mass number of the neutron, X represents the mass number of the unknown element, 141 represents the mass number of Ba, and 3 represents the mass number of three neutrons. This means X should have a mass number of 92, which is the element Kr.

Therefore, the mass number is 92 and the chemical symbol is Kr.

Answer:

Graph D.

Explanation:

The frequency of a wave 2.8 x 10³ Hertz is then the wavelength of these gamma rays is 107 nm

Wavelength is the the distance between two successive crests or troughs of a wave

Here given data is

Frequency = 2.8 x 10³ Hertz

Velocity of gamma rays = 3×10⁸m/s

We have to calculate wavelength of these gamma rays?

So, wavelength = velocity/frequency

λ = v/f

λ = 3×10⁸m/s/2.8 x 10³ Hertz

λ = 107 nm

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In this question we are given with the value of atmospheric pressure 764.7 torr.

And a sample of gas is placed in vessel attached to an open-end mercury manometer.

The level of mercury in the open-end arm of the monometer has a height of 136.4 mm and that in the arm that is in contact with the gas has a height 103.8 mm.

We know that,

h is the difference of heights of manometer and contact point

h = 136.4 - 103.8

h = 32.6 mm

On considering acceleration to the gravity, g =  10m/ss

Pressure inside the glass = dgh

So,

pressure of gas in atmosphere = 764.7 + 32.6 = 797.3

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The ph of the solution after 40. 3 ml of NaOH have been added to the acid is 10.

Titration is a commonplace laboratory technique of quantitative chemical analysis to determine the attention of an identified analyte. A reagent, termed the titrant or titrator, is ready as a trendy answer of recognized awareness and extent.

Calculation:-

Normality of acid                                                normality of base

= nMV                                                                        nMV

= 1 × 0. 30 × 0.02                                               1 ×  0. 15 ×0.0403 L

= 6 × 10⁻³                                                             = 6.1 × 10⁻³

overall base will be high

net concentration = 6.1 × 10⁻³ - 6 × 10⁻³

                              = 0.1 × 10⁻³

                              = 1 × 10⁻⁴

p0H = -log[1 × 10⁻⁴]

     = 4

pH = 14 - 4

       = 10

A titration is defined as 'the manner of determining the amount of a substance A by using adding measured increments of substance B, the titrant, with which it reacts till precise chemical equivalence is completed the equivalence factor.

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Answer & Procedure

To solve this problem you will need to transform all the concentrations to the equivalence of ppm, which is 1 mg of solute per 1 L of solution.

Calcium: There are 43 μg of calcium in a total volume of 87 mL.

Caffeine: There is 0.91 mg of caffeine in a total volume of 105 mL.

Trace particles: There is 0.47 mg of trace particles in a total volume of 95 dL.

The heat energy teaspoon of boiling water and a swimming pool full of room temperature water then swimming pool have more heat energy than the teaspoon of boiling water

Heat energy is the result of movement of tiny particles called as atom, molecule, or ion in solid liquid and gases and heat energy is the transfer from one object to the another and in Celsius scale water freezes at 0°C and boil at 100°C to 90°C however the swimming pool contains a lot more water therefore the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool that's why heat energy is more in the swimming pool then in teaspoon of boiling water

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When aluminum is reacts copper (II) chloride then it will form aluminum chloride and Copper.

Aluminum as well as copper(II) chloride combine very vigorously, causing the reaction mixture to become extremely hot as heat was produced, the aluminum foil to breakdown, a reddish brown solid to appear, as well as gas bubbles to be released.

The chemical reaction can be written as:

2Al + 3CuCl2 → 3Cu + 2AlCl3

Therefore, Copper and aluminum chloride will be formed after the reaction as a product.

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The pH of the solution after addition of 50.0ml is 0.1003

pH is known as the negative logarithm of the hydrogen ion concentration in a solution.

 In the given condition we have 100 ml of sample of 0.18 molar of HclO4 titrated with 0.27m LioH.

   pH = log[H+]

        = log [Hclo4]

Mole of Hclo4 0.1 L * 0.18 m = 0.018 M

mol LiOH = 0.1 L * 0.27 m = 0.027 M

total volume = 0.1L + 0.1L = 0.2L

HClO4] = (0.018-0.0081) /0.2 L

= -1.26 billion

PH = -㏒ -1.26

= 0.1003

So, the pH of the solution after adding 100 ml of liquid is 0.1003

55,035.5 Joules

Heat of vaporisation is the amount of energy required to transform a mole of liquid water into gas at constant temperature.

Given the following parameters:

Mass of water = 24.40 grams

ΔHvap = 40.6 kJ/mol

Determine the moles of water

Mole = mass/molar mass

Mole = 24.40/18

Mole of water = 1.356moles

Determine the required heat required

Q = mole of water * ΔHvap

Q = 1.356moles * 40.6kJ/mole

Q = 55.0355kJ

Q = 55.0355 * 1000

Q = 55,035.5 Joules

Hence joules of heat needed to completely vaporise 24.40 grams of water at its boiling point is 55,035.5 Joules

A state function only depends on the thermodynamic system's starting and current states.

A thermodynamic system is a collection of objects or a significant region of space. The surroundings or mass outside the system is referred to as such, and the border is the region separating the two.

For instance, if we are examining a car engine, the thermodynamic system is the gasoline burning inside the engine's cylinder, and the system's surrounds are the radiator, exhaust system, piston, and outside air. The inner surfaces of the cylinder and piston then form the boundary.

The cosmos is made up of the system and its surroundings. Thermodynamic systems can be classified as open, closed, or isolated. With its surroundings, an open system can interchange both matter and energy. Since heat and water vapor can be lost to the air, the stovetop example would be considered an open system.

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Power is an objects' change in energy over a specific time.

We define the term power as the rate of the change of energy with time. We know that the energy of a body has to do with the ability of the body to do work.

This implies that we can be able to write the formula of the power of a body as the following;

Power = Energy/ Time

Thus we can now see that power is the change in energy over a specific time. This is how we can be able to obtain the /power of an object under study.

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1s22s22p63s^13p^3 is correct electron configuration for SI atomic number.

What is electron configuration?
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations adhere to a standard notation in which all atomic subshells that contain electrons are arranged in a sequence with the number of electrons they each hold written in superscript. For instance, sodium's electron configuration is 1s22s22p63s1. Long electron configurations are frequently produced by the standard notation. In these circumstances, a shortened or condensed version of the standard notation may be used. The sequence of fully filled subshells that represent the electronic configuration of a noble gas are replaced in the abbreviated notation by the symbol for that noble gas enclosed in square brackets.

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An ionic bond is also called an electrovalent bond. It is formed from the electrostatic attraction between oppositely charged ions in a chemical compound.

Answer: charge attraction.

E3 is least transition of an electron in the hydrogen atom emits a photon with the smallest amount of energy.

A hydrogen atom is an atom belonging to the element hydrogen in chemistry. One positively charged proton and one negatively charged electron are both present in the electrically neutral atom and are held to the nucleus by the Coulomb force. Normal circumstances are infrequent for lone neutral hydrogen atoms. Hydrogen atoms can also exist in cationic and anionic states, however neutral hydrogen is frequently seen when it is covalently joined to another atom.

Energy is the quantifiable attribute that is transferred to a body or a physical system in physics. It is observable in the production of work as well as in the form of heat and light. The law of conservation of energy asserts that although energy can be changed in form, it cannot be created or destroyed. Energy is a conserved quantity.

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Consider a galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips then tin is the anode

Galvanic cell is the electrochemical cell that converts the chemical energy of spontaneous redox reactions into electrical energy

Here given data is galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips and the reaction is

3Sn(s) + 2NO₃⁻(aq) + 8H⁺(aq) → 3Sn²⁺(aq) + 2NO(g) + 4H₂O(l)

Then in the galvanic cell oxidation takes place at the anode means the tin is the anode

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According to the beer-lambert law when its concentration increases  so does the absorbance increase.

beer-lambert law states that the amount of energy absorbed or transferred by a solution is proportional to the molar absorptivity of the solution and the concentration of the solute.

This means that concentrated solutions absorb more light than dilute solutions.

so the According to the beer-lambert law concentration increases, so does the absorbance. Therefore, absorbance is directly proportional to concentration.

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The volume of a cylinder is calculated using the following formula:

Where r is teh radius of the base and h is the high:

As we know 1cm³=1ml

to calculate the density we just have to divide the mass by the calculated volume:

The especific gravity is the density in relation to the density of water which is 1 g/ml therefore:

Answer:

SO2

Explanation:

SO2 causes acid rain which is leading to dissolving of the marble on the Taj Mahal

SO2 reacts with water to come down as sulfuric acid during acid rains