please help now:) very easy

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

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

Catalysts will increase the rate of polymerization and decrease the activation energy necessary for further polymerization.

Polymerization is a chemical reaction that involves the joining of simple molecules to generate long-chain molecules. Catalysts accelerate polymerization by decreasing the activation energy required for further polymerization. Catalysts can be light, heat, water, acids, or other compounds. Uncontrolled polymerization frequently results in a massive release of energy. In the blue and yellow portions of the ERG, materials that may undergo violent polymerization if exposed to heat or pollution are denoted with a P.

Inhibitors are compounds that are applied to easily polymerizing products to inhibit or avoid an undesirable reaction. Inhibitors increase the amount of activation energy required.

Therefore catalysts will increase the rate of polymerization and decrease the activation energy necessary for further polymerization.

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The percent yield of SiC is 76.6% if 79.1 grams of carbon reacts with an excess of silicon dioxide and 67.4 g of silicon carbide is actually recovered.

The first step is to balance the equation that is given. On balancing we get,

SiO2 + 3C  → SiC +  2CO                                            

In the Next step, we need to Determine the theoretical amount of silicon carbide produced (if all carbon reacted).

"Excess silicon dioxide" in the question can be interpreted that carbon being the limiting reactant, and thus the amount of silicon carbide produced depends on how much carbon is available to react in the reaction.

From the balanced equation, it could be understood that for every 3 moles of carbon reacted, 1-mole silicon carbide is produced. Therefore,

Molar mass carbon = 12.01 g/mol

Molar mass silicon carbide = 28.09 g + 12.01 g

Molar mass silicon carbide = 40.1 g/mol

Then,

Theoretical yield = 79.1 g x (1 mol / 12.01 g) x (1 mol / 3 mol) x (40.1 g / 1 mol)

Theoretical yield = 88.04 g SiC

Therefore the theoretical yield is 88.04g

From the given values the percent yield can be computed as,

Percent yield = (actual yield of SiC / theoretical yield of SiC) x 100%

                  = (67.4 / 88.04) x 100%

                  = 0.766 x 100%

% yield of SiC = 76.6%

Therefore, the percent yield of SiC is 76.6%

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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

Answer:

Explanation:

Magnification = 20  * 80

1600

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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ANSWER

They are positively charged and move toward an anode

Option C

EXPLANATION

In electrochemical reaction, cation are positively charged. Since they are positively charged, they move toward negatively charged anode

There are two types of reaction which are oxidation and reduction reaction. At oxidation, the positively charged cations move towards the negatively charged anode.

Recall, that like charges attract and unlike charges repel.

Therefore, the correct answer is option C

An oxidizing agent is required. In c), there's no extrude withinside the oxidation numbers, so nor is required. Indicate whether or not every of the subsequent chemical conversions REQUIRES an oxidizing agent (O), a decreasing agent (R), or neither (N).

a) NO31- NH3

b) PO33- PO43-

c) AgCl Ag1+ + Cl1-

a) NO3- --> NH3 Requires a decreasing agent

b) PO33- --> PO43- Requires an oxidizing agent

c. AgCl --> Ag+ + Cl- There isn't any extrude in oxidation wide variety.

You discern this out with the aid of using searching on the oxidation numbers of factors withinside the equations. In the primary one, the oxidation wide variety of N decreases. Since that is a reduction, a decreasing agent is required. In b), the oxidation wide variety of P increases. Since that is an oxidation, an oxidizing agent is required. In c), there's no extrude withinside the oxidation numbers, so nor is required.

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Kilocalorie is a unit of measuring the amount of energy of a reaction, but this is not the only unit, we can also have Joules as a unit, and the conversion is:

1 Kcal = 4184 Joules

Therefore if we have 3.25 Kcal, we will have:

3.25 * 4184 = 13600 Joules of energy, therefore letter D

Answer:

Seven waves make up the electromagnetic spectrum.

Explanation:

Radio Waves

Used in television and radio broadcasts

Microwaves

Used for satellite communications and heating up food

Infrared radiations

Used in electric heaters and other heating devices.

Visible light

used for fibre optic communications

Ultraviolet rays

used in energy-efficient lamps, sun tanning

X-rays

Medical imaging and treatments

Gamma rays

used for sterilizing and disinfecting

Wavelengths down the spectrum increase as the frequency decreases.

Explanation:

First, we need to know that Calcium oxide is:

CaO.

Molar mass of it is:

Ca = 40 g/mol

O = 16 g/mol

CaO = 56 g/mol

To discover the number in moles of 5.45 g of CaO we just need to use the following formula:

n = m/MM

m = 5.45

MM = 56 g/mol

n = 5.45/56

n = 0.09732 moles

Answer:

0.09732 moles

Explanation:

We have to find the net charge of a polyatomic ion that contains 49 protons and 50 electrons.

n° of protons = 49 n° of electrons = 50

The charge of each electron is -1 and the charge of each proton is +1.

charge of electron = -1 charge of proton = +1

Finally the net charge will be:

Net charge = n° of electrons * charge of electron + n° of protons * charge of proton

Net charge = 50 * (-1) + 49 * (+1)

Net charge = -1

Answer: C) -1

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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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.

This exercise is similar to the previous one and we can solve it by following the same steps. We have the number of molecules in the reagents:

2 Al

6HCl

The atoms of the molecules do not have subindexes*, therefore the total value will be equivalent to the coefficient multiplied by 1:

Al: 2 x 1 =2

H: 6 x 1 = 6

Cl: 6 x 1 = 6

So, must be present 6 atoms of hydrogen in the products

* Subindexes: "A letter or number placed to the right and at the bottom of a mathematical, chemical, etc. symbol to distinguish it from other similar symbols". For example:

In this case, the subindex will be number two. It means that there are 2 hydrogens in the molecule.

NADH/NAD+ ratio would lead to a decrease in the rate of entrance of acetyl coa into the citric acid cycle.

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Answer:

Graph D.

Explanation:

On converting 1.76x10²⁷ atoms of Strontium to grams we get 256020g

It is given that the number of atoms of Strontium is 1.76×10²⁷. To convert the number of atoms of Strontium to grams, the following formula is used:

Grams of Strontium= number of atoms of Strontium × Atomic Mass of Strontium/Avagadro number

We know that the atomic mass of Strontium is 87.6g. Its atomic number is 38. Then the number of grams of Strontium in 1.76x10²⁷ atoms is given by

Grams of Strontium= (1.76 x 10²⁷ x 87.6) / 6.022x10²³

                                = 154.176x10⁴/6.022

                                = 25.602 x 10⁴

                                =256020g

In this way, the conversion of atoms into grams can be done easily.

Therefore, 1.76 x 10²⁷ atoms of Strontium on conversion to grams give 256020g.

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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 three ways synthetic polymers affect the environment-

1. Some synthetic polymers use materials from Earth that are nonrenewable.

2. They can end up as waste products that sometimes can’t be recycled.

3. They sometimes release toxins into the environment.

What are synthetic polymers?

Synthetic polymers are a subset of man-made polymers, meaning they are produced in factories or laboratories using chemicals.

Nylon, polyester, and polyethylene are a few examples of these polymers. Numerous items of clothing and plastic that we use every day are made with these polymers.

There are several drawbacks to synthetic polymers, including. Due to their non-biodegradability, these polymers, particularly plastics, may become waste materials that pollute the environment, end up in lakes and livers, and pose a threat to aquatic life.

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Answer:

spring

Explanation:

Answer: C.  Waves don't move matter, just energy.

Explanation:

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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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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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:

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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Answer: Both the hydrogen atoms present in carbonic acid are replaceable and thus the maximum no of H atoms can be removed is 2.

Explanation:

Hydrogen is not bonded to another hydrogen in carbonic acid. Although the shorthand formula is H2CO3 which must be the reason behind the question, the structure is actually:

Meaning that each of the hydrogen atoms is in resonance with an oxygen. Since the oxygens are by themselves very electronegative, meaning they attract the hydrogen electron very strongly and stably, they can easily loose the hydrogen proton.

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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