Just question 2 pleasee

The substance that will give an aqueous solution of pH < 7 is (e) NH₄Br.

a) Balanced chemical equation for the reaction of sodium carbonate with water: Na₂CO₃ + 2H₂O → 2NaOH + H₂CO₃

Hydrolysis of this salt gives strong base (NaOH) and weak acid (H₂CO₃), so pH is greater than 7

b) Hydrolysis of sodium acetate gives strong base (NaOH) and weak acid (CH₃COOH), so pH is greater than 7

c) Hydrolysis of potassium gives strong base (KOH) and strong acid (HI), so pH is equal to 7

d) Methanol is neutral, pH is equal to 7

e) Hydrolysis of ammonium bromide gives weak base (NH₄OH) and strong acid (HBr), so pH < 7.

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93 ml of sulphuric acid is to be added to prepare a 1.5 L solution of sulphuric acid.

The concentration of sulfuric acid is C1.

[tex]C_{1} = 1.6 \: mol/g[/tex]

The volume of the solution after dilution is V2.

[tex]V _{2} = 1.5 \: litres[/tex]

The concentration of solution after dilutions is C2.

[tex]C_{2} = 0.10 \: mol/ \: l[/tex]

Let the volume of sulfuric acid be V1.

The volume of the sulphuric acid is,

[tex]V _{1}C_{1} = C_{2}V _{2}[/tex]

[tex]V _{1} = \frac{C_{2} \times V _{2}}{C_{1} }[/tex]

[tex] = \frac{1.5 \times 0.10}{1.6} [/tex]

= 0.093 litres

The volume of the sulphuric acid is 0.093 litres.

The volume of the sulphuric acid in millilitres is,

1 L = 1000 ml

[tex]0.093 \: l = 0.093 \times 1000[/tex]

= 93 ml

The volume of sulphuric acid is 93 ml.

Therefore, for preparing a 1.5-litre solution of sulphuric acid, 93 ml of sulphuric acid is to be added.

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The ratio of the hydrogen masses in the compounds is 2: 3(Option A).

We know that compounds are composed of atoms and that compounds are formed by the combination of atoms. According to the atomic theory, the combination of the atoms with each other to form compounds occurs in a definite ratio.

From the law of multiple proportions, if two elements combine in such a way that they could lead to the formation of more than one type of compound, the combination occurs in such a way that masses of the second element that combines with first element are in simple ratios.

We can see from the statements in the complete question that the ratio of the hydrogen masses in the compounds is 2: 3(Option A).

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The metric unit of length or distance is most comparable in scale to each of the following English system units for making measurements of a yard.

The most widely used units of distance in the metric measurement system are millimeters, centimeters, meters, and kilometers.

The metric system is a way to measure things.

It is employed in calculations and research all around the world. Here are some instances of measurements made with the metric system;

The unit used to measure lengths and distances is the meter.

In daily life, we use this unit to measure things like the length of a piece of clothing, the distance from school to home, the weight of chocolates, etc.

Eg: 250 grams of potato chips, as an illustration. The unit of weight used here is the gram.

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The factors that will affect the rate of diffusion of gas are as follows:

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A tiny permanent magnet is always susceptible to demagnetization or having the polarity of the magnet reversed by lightning.

Even a permanent magnet is sensitive to induction, which can cause its polarity to change and become stronger, weaker, or even reversed.

Not just in multicellular creatures but also in individual cells and subcellular structures, polarity enables the development of functional complexity. Polar organisation enables physical relationships between areas with various functions in a way that supports function integration across the entire organism.

The polarity of water causes hydrogen bonds to form when adjacent water molecules are drawn to one another by their opposing charges. Other polar molecules and ions, such as many biomolecules including sugars, nucleic acids, and certain amino acids, are likewise drawn to or attracted by water.

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In order to prepare a formic acid buffer with a pH of 4.77, a solution with a mole fraction of 10.0 mol HCOONa to 1.0 mol HCOOH is used.

Because formic acid is a weak acid with a pH close to 4.77, try to prepare a formic acid buffer with a little bit more sodium formate than formic acid.

pKa of formic acid is -log (1.7 x 10-4) = 3.77. A formic acid buffer with the necessary pH should be created by combining 10 moles of formate anion with 1 mole of formic acid. Each of these concentrations can be used to modify buffer capacity.

pH = pKa + log [HCOOH]

4.77 = 3.77 + log [HCOOH]

1 = log [HCOOH]

HCOOH = antilog 1

HCOOH = 10

Therefore, the ratio of HCOONa to HCOOH is 10:1

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The independent variable that we change in an experiment.

The correct option C.

A variable that is independent is precisely what it seems like. It is an independent variable that has no bearing on the other factors you are trying to evaluate. For example, age may be an independent variable. Time is a popular independent variable since it is undisturbed by any dependant environmental influences.

You can have independent or dependent variables. Other variables have an impact on the value of independent variables, while dependent variables have an impact on the value of independent variables. A hypothesis identifies an anticipated connection between two variables.

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The complete question is -

What do you call the one variable that is changed in an experiment?

A. experimental variable

B. controlled variable

C. independent variable

D. dependent variable​

Answer:

Element: found on periodic table....

Polymer: multiple monomers....

Monomer: one-SINGLE...

Ionic bonding is found in many ceramic structures such as NaCl, MgO, and Al2O3. Atoms have, unlike electrical charges, making them ions, which create an electrostatic attraction between atoms. This causes bonding between atoms.

The ions pack into a regular arrangement. The nature of the ceramic depends on the size of the ion charges and the size of the ions.

For example, the structure shown left is the rock salt structure, such as that for NaCl.

Covalent bonding is found in many ceramic structures such as SiC, BN, and diamond. The atoms in these ceramics are arranged so that each pair of nearest neighbor atoms forms a chemical bond by sharing a pair of electrons.

The high energy of covalent bonds makes these ceramics very stable with regard to chemical and thermal changes.

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The number of atoms present in the sample is 2.163 x 10²² atoms.

The mass of the sample is 0.25 g.

The number of atoms present in the sample is calculated as follows;

E = nhf

where

n = E/hf

n = (8600) / (6.626 x 10⁻³⁴ x 6 x 10¹⁴)

n = 2.163 x 10²² atoms

6.02 x 10²³ atoms of Lithium = 6.9 g

2.163 x 10²² atoms = ?

= (2.163 x 10²² atoms x 6.9 g) /(6.02 x 10²³ atoms )

= 0.25 g.

Thus, the number of atoms present in the sample is 2.163 x 10²² atoms. The mass of the sample is 0.25 g.

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According to the given statement the WHMIS symbols and safety and precautions when handling compressed gas:

Consumer Goods. The Workplace Hazardous Materials Management System (WHMIS) assists in identifying the dangers of items such as chemicals and infectious agents.

WHMIS labels are crucial because workplaces require a defined means of identifying hazardous products. The WHMIS system allocates responsibility for classifying any potential hazards to both suppliers and employers.

Make sure the storage temperature doesn't really exceed 52°C (125°F). Compressed gas cylinders should be stored, handled, and used upright. Never roll, drag, or drop cylinders or allow them to collide. Handcarts or other cylinder-moving equipment should be used.

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The amount of manganese oxide that should be added is 0.869 moles.

The balanced equation of the reaction is,

[tex]MnO _{2} (s) + 4HCl → MnCl _{2}(aq) + 2 H _{2} O + Cl _{2}(g)[/tex]

The volume of hydrochloric acid that has to be obtained is V.

V = 275 ml

The temperature is T.

T = 5° C = (273+ 5) K = 278 K

The pressure is P.

P = 650 mm of Hg = 0.85 atm

The gas constant is R.

R = 0.0821 L atm/ K mol

The number of moles of chlorine gas that will be produced is,

PV = nRT

[tex] n = \frac{ PV}{ RT }[/tex]

[tex] n = \frac{0.85 \times 0.275}{0.0821 \times 278} [/tex]

n = 0.01 moles

The 0.01 moles of chlorine gas will be produced.

The amount of manganese oxide that should be added to hydrochloric acid to produce 275 ml of fluorine gas is,

[tex]0.01 \: mol \: of \: Cl× \frac{ 1 mmol \: of \: MnO }{mol \: of \: Cl } = 0.01 \: moles \: of \: MnO _{2} \: needed.

[/tex]

[tex]0.01 \: mol \: of \: MnO _{2} = \frac{86.9}{ mol \: of \: MnO _{ 2}}=0.869 \: moles

[/tex]

Therefore, the amount of manganese oxide that should be added to hydrochloric acid to produce 275 ml of fluorine gas is 0.869 moles.

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Answer:

The second one

Explanation:

It the graph is correct, it has the most nuetrons

Answer:

Explanation:

The net force is 10-7= 3N and the car moves in the direction of the greater force applied i.e. towards the green arrow or the right side

0.265 amperes are required to deposit of lead metal.

m(Pb) = 0.229 g; mass of lead metal

t = 802 s; time of the reaction

n = 2; number of moles electron involved in electrolysis

F = 96485 C/m; the Faraday's constant

M(Pb) = 207.2 g/mol; the molar mass of the lead

Electrolysis is a chemical methode that uses electric currents for chemical reactions.

To solve this problem, we need Faraday's law of electrolysis:

I = m×n×F / t×M

I = 0.229 g × 2 × 96485 C/m / 802 s × 207.2 g/mol

I = 0.265 A, the current

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Something done to test a hypothesis that produces new observations is called an experiment.

If you want to test a hypothesis, you need to do an experiment. This is where you take your idea and test it out in the real world. By doing this, you can see what happens and gather new observations.

Experiments are a key part of the scientific process. They help us to understand how the world works and can prove or disprove hypotheses. Without experiments, we would be stuck in our own heads, never knowing for sure if our ideas were correct.

So, if you have a hypothesis that you want to test, get out there and do an experiment! See what happens and learn something new.

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Answer:Flame tests are used to help identify substances used in murders

Explanation:

The correct answer of this question is 4.

If propane is dichlorinated, the resulting structural/constitutional isomers are the positional ismoers having different IUPAC names.

The resulting possible isomers are:-

1-1, dichloro propane

1-2, dichloro propane

2-2, dichloro propane

1-3, dichloro propane

Thus, we have 4possible constitutional isomers of dichlorinated propane.

Structural isomers or constitutional isomers are also known as constitutional isomers as they have same molecular formula but different in their structure or have different structural formula.

Structural isomers are further divided into five types:-

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Answer: The brown bear spreads berry and plant seeds in its scat.

Explanation:

The action of investigating something or someone; formal or systematic examination or research.

Scientific investigation is what people like you and me use to develop better models and explanations for the world around them.

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c) 2-hydroxypropanoic acid is the correct Iupac name compound.

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A solution is an example of a homogenous mixture. The correct option is b.

A homogeneous mixture is one in which the composition is consistent throughout. Because the dissolved salt is evenly distributed throughout the salt water sample, the salt water is homogeneous.

A heterogeneous mixture is one in which the composition varies throughout the mixture. Vegetable soup is a diverse concoction.

A solution is a uniform mixture of one or more dissolved solutes in a solvent. It should be noted that the solvent is the most abundant substance.

There are numerous solutions available. A solute, for example, can be a gas, a liquid, or a solid.

Thus, the correct option is b.

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Explanation:

The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change

The balanced half reaction for reduction of the permanganate ion,  to manganese ion,  is shown below:

[tex]MnO_{4^{-} }[/tex] + 8[tex]H^{+}[/tex] + 5e- → [tex]Mn^{2+}[/tex] +  [tex]H_{2} O[/tex]

The portion of an overall reaction that represents either an oxidation or a reduction separately is known as a half-reaction.

A redox reaction can only be fully described by two half-reactions, one oxidation and one reduction.

The chemical compound that contains the manganate (VII) ion is known as permanganate. Because manganese is in the +7 oxidation state and is rapidly reduced and oxidised by other elements, the permanganate(VII) ion is a potent oxidising agent.

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(1) If chlorine gas is bubbled through an aqueous solution of sodium astatide, the result is elemental iodine and aqueous sodium chloride solution.

(2) No chemical change is observed when astatine is added to an aqueous solution of potassium iodide.

(1) Aqueous sodium chloride salt is created when chlorine gas and sodium astatide combine in the proper circumstances. An electron is taken from the sodium and given to the chlorine. The electrostatic interaction between the particles makes this reaction more favorable. Large amounts of heat and light are emitted during the process.

So, the result is elemental iodine and aqueous sodium chloride solution.

(2) Astatine is present below iodine in the periodic table in group 7 and it is less reactive than iodine, so no chemical change is observed when astatine is added to an aqueous solution of potassium iodide.

Hence, no displacement by astatine takes place.

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When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction.

It is True.

Amino acid molecules make up proteins. Proteins and amino acids are essential to life. After proteins have been digested or broken down, amino acids are still present. To maintain the body, the human body makes proteins from amino acids: Prepare food.

Taking a supplement containing essential amino acids is wonderful because you can do so anytime you choose. While some athletes prefer to take it with meals or a protein shake, others prefer to take it on an empty stomach in between meals.

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If phosphorus with 15 neutrons, the mass number of an isotope of phosphorus is 31.

Isotopes are two or more types of atoms that have the same atomic number and position on the periodic table but differ in the number of nucleons due to the different number of neutrons in the nucleus.

An isotope is one of two or more atomic types of a chemical element that have the same atomic number and position on the periodic table and nearly identical chemical behavior, but different atomic masses and physical properties.

If two atoms have different numbers of protons, they are different elements. However, two atoms with the same number of protons and different number of neutrons are called isotopes. Two terms used to identify nuclides isotopes are atomic number and mass number.

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