A student investigated the concentration of a solution of sodium hydroxide by titration with a 0.0480 mol/dm3 ethanedioic acid solution.
This is the method used.

1. Measure 25.0cm3 of the sodium hydroxide solution into a conical flask using a 25.0cm3 pipette

2. Add 2 drops of indicator to the sodium hydroxide solution

3. Fill a burette with the 0.0480 mol/dm3 ethanedioic acid solution to the 0.00cm3 mark

4. Add the ethanedioic acid solution to the sodium hydroxide solution until the indicator changes colour

5. Read the burette to find the volume of the ethanedioic acid solution used

Suggest two improvements to the method that would increase the accuracy of the result.

Answer - Cubic meter (aka the meters)

Explanation - The SI unit of volume is the cubic meter (m3), which is a derived unit. Liter (L) is a special name for the cubic decimeter (dm3).

The formula  2n^2 is used to find the number of electrons in a shell.

Atoms are composed of electrons in shells in addition to the protons and the neutrons in the nucleus. Electrons are known to be found in shells. The shells are arranged in order of increasing energy; KLMN. It is often important to find the number of electrons that could be found in a particular shell of an atom.

We can find the number of electrons in a shell or energy level by the use of the formula 2n^2. We know that the shells KLMN corresponds to 1, 2, 3, 4 ...

Using this model, the electrons in the K shell are 2(1)^2 = 2

Electrons in the L shell are; 2(2)^2 = 8 etc

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Answer:

a. Must be constantly tested and revised

Explanation:

theories should constantly be tested and revised.

The investigator should show that the organism was not sterile before the experiment began. So the correct option is A.

A scientific hypothesis is a theory that offers a speculative explanation for a phenomenon or a specific group of related events that have been observed in the natural world. The capacity to be supported or disproven by observation and experimentation are the two main characteristics of a scientific hypothesis, and they are embodied in an "If...then" statement that summarises the notion. In the middle of the 20th century, British philosopher Karl Popper, who was of Austrian descent, established the idea that a scientific theory might be both falsified and tested.

The scientific method, the strategy used by scientists to try to comprehend and evaluate theories regarding natural events, includes the formation and testing of hypotheses. The process of developing a hypothesis is commonly referred to as creative and is based on prior scientific understanding, intuition, or experience.

Therefore, the correct option is A.

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The statement is true.

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 dehydration reaction.

What are amino acids?

The building blocks of protein in your body are called amino acids. In other words, you can't actually develop new muscle without your amino acids when it comes to protein synthesis. Your body can produce amino acids on its own as a byproduct of regular activity, which are known as your nonessential amino acids.

A dehydration reaction can unite two amino acid monomers when they are arranged so that the carboxyl group of one is next to the amino group of the other.

Thus, the made assertion is true.

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By comparing the density of the two rocks, Rock B has the greater density.

The density of a substance is a measure of the compactness of the particles of that substance.

The density of a substance is defined as the ratio of the mass amd the volume of that substance

The densities of the two rocks are determined as follows:

mass of rock A = 10 g

mass of rock B = 20 g

volume of the two rock = v

Density of Rock A = 10/v

Density of Rock B = 20/v

Ratio of density of Rock A and B = 1/2

Therefore, Rock B has the greater density.

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The elements of a brand that cannot be spoken are called option(a)i.e, brand mark.

A brand mark is a logo, design element, artistic creation, or other visual representation that facilitates the quick identification of a particular company. Building and maintaining a brand's reputation is essential.

The brand mark is significant because it draws attention, makes an impact, establishes your brand identity, is memorable, sets you apart from rivals, fosters brand loyalty, and is well-liked by your target market.

However, when examining examples of brand markings, Pepsi is without a doubt the superior firm to take into account. Coca-Cola still employs its name as part of its design, in contrast to Pepsi, which may get by with nothing more than its recognizable white, blue, and red globe to draw customers' attention.

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The concentration of the diluted solution is 1.11M , using formula M1V1=M2V2 (whereM = molarity , V = volume).

The formula M1V1=M2V2 is the most widely used.

You must ensure that M stands for Molarity and V for Volume in Liters in this formula. You must divide 29.0 mL by 1,000 in order to convert this problem's mL to L units (mL =.0290 L).

M1 is the specified molarity (7.71M), and V1 is the specified molarity's volume (.0290 L).

The final molarity M2 is what we are looking for, and the final volume V2 equals 1000 L. (remember to convert the 200.0 mL to L)

Fill in the formula with your numbers.

(X) × (0.2000 L) = (7.71M) × (0.0290 L)

(7.71M) × (0.0290 L) / (0.2000 L) = (X)

1.11M = X

Given that we maintained the same number of moles in the solution, this makes sense.

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2.18 x 10⁻¹⁸ J/atom is the ionisation energy of hydrogen.

The minimum energy required by an electron in an atom or ion to come out from the control of the nucleus is known as ionisation energy. It measures the capability of an element which can take part in a chemical reaction by accepting or donating electrons. It is expressed in electron volt (eV).

It will help in the understanding of the reactivity of the chemical  compounds.

For Ionisation energy formula  

                              1/λ =R[1/n₁²-1/n₂²]

                                 n₁=1     n₂= ∞

                              R=1.0974 x10¹⁷m⁻¹

                            1/λ =1.0974 x10¹⁷m⁻¹x[1/1-0]                                      ( 1/ ∞=0)

                                 λ=9.116x10⁻⁸m

                                        E=hc/λ

h=6.63x10⁻³⁴Js             c=3x10⁸m/s             λ = 9.116x10⁻⁸m

                       E=(6.63x10⁻³⁴Js x  3x10⁸m/s) ÷ 9.116x10⁻⁸m

                                          E=2.18x10⁻¹⁸J/atom.

Ionisation energy of Hydrogen is 2.18x10⁻¹⁸J/atom.

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Sarah knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a ph around 5.7. So the correct option is (B) Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.

Limestone is a sedimentary rock mostly made of calcium carbonate (calcite) or calcium and magnesium double carbonates (dolomite). Small fossils, shell pieces, and other fossilised debris are frequently found in its composition.

Calcium oxide, which is derived from limestone, is used in the manufacture of steel, mining, paper, water treatment and purification, and plastics. Lime is extensively used in agriculture and the production of glass.

The biggest myth about limestone is that it's a delicate stone. Actually, limestone can be anything from extremely hard to soft. It should be selected keeping in mind the final design while paying close attention to its intended usage.

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The complete question is ''Sarah and Evan are in the same science class. The teacher asks the class to design an experiment to determine the effect of acid rain on limestone. Sarah designs an experiment which uses chalk and carbonic acid at a pH of 5.7, because she knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a pH around 5.7. Evan designs an experiment which uses limestone tiles and acid rain collected from the environment. How do these experimental methods compare?

A. Sarah's experimental results will be easier to predict. Evan's results will be impossible to predict since he uses real acid rain.

B. Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.

C. Evan's experimental design will prevent him from being able to form a logical conclusion, whereas a conclusion can be made with Sarah's design.

D. Evan's experiment can be preformed at any time, but Sarah's experiment can only be performed when there is a rainstorm.

Answer:

Green: Heating & Evaporation

It is the solution which is to be distilled (separate water from the salt). Heat is applied at the flask and the solution boils hence producing vapour.

Yellow: Temperature measurements

At this point, the temperature of the vapor is measured by the thermometer. Here, discrimination occurs, when temperature is 100°C (Bpt. of water), then the temperature is made constant.

Pink: Ejection of warm water

This is the outlet on the lie big condensor of water which absorbs the temperature of the vapor. This water is released when vapor is undergoing condensation (turning into liquid)

Green: Insertion of cold water

Cold water is passed through the condensor so as to cool down the vapor into liquid

Red: Condensation

Along the tube, vapor is being cooled down and condensed into a liquid characteristic.

Purple: Water jacket (condenser)

This is the condenser tube through which cold water passes to cool down the vapor.

Blue: Distillate

The condensed vapor (water) is collected in a conical flask

Explanation:

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Net charge

(a) histidine 0, +2, 0, -1

(b) leucine 0,

(c) aspartic acid 0

(d) tyrosine 0

(e) asparagine 0

What is ph ?

The hydrogen ion concentration is measured using the pH scale. The pH values, which range from 0 to 14, are assigned to it. Therefore, we may say that the pH value is a number that represents how acidic or basic a solution is.

A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.

Thus, histidine has a net charge of 0 at ph 1, of 2 at ph 4 of 0 again at ph 8 and finally of -1 at ph 12.

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Moles = mass/molar mass

mass= 6.29 g.

molar mass = 16.04 g .

Moles of methane collected are = 6.29/16.04

= 0.39.

0.39 moles of methane gas was collected.

Hydrocarbon methane (CH4) is a main constituent of natural gas. Because methane is a greenhouse gas (GHG), its presence in the atmosphere has an impact on the planet's climate and temperature. There are many anthropogenic (influenced by humans) and natural sources that release methane.

High methane levels may reduce the amount of oxygen breathed from the air. This can cause symptoms like headaches, face flushing, slurred speech, visual problems, memory loss, mood swings, and altered eyesight. In dire circumstances, it's possible to have changes in breathing and heart rate, balance problems, numbness, and unconsciousness.

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The molarity of the solution is c. 0.0506 m.

b(LiF) = 0.0460 m; molality of the solution

Molality is concentration expressed in moles per kilogram.

d(LiF) = 1.1 g/ml; the density of the solution

M(LiF) = 26 g/moll; molar mass of the solute

The solute is the component present in small quantities in solution.

The relation between molarity and molality is c = 1000d / (1000/b + M)

c = 1000×1.1 / (1000/0.046 + 26)

c = 0.0506 M; the molarity of the solution

Molarity is defined as the number of moles of the solute per liter of the solution. It is denoted by M.

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The density of chromium is 7.15 g/cm³.

There is three types of cubic cell:

1) simple cubic unit cell.

2) body-centered cubic unit cell.

3) face-centered cubic-unit cell.

In body-centered cubic unit cell there are two atoms in one cell.

m(Cr) = 52 amu; mass of chromium atom

r(Cr) = 125 pm; the radius of a chromium atom

V(Cr) = 4/3 × r³ × π

V(Cr) = 4/3 × (1.25×10⁻⁸cm)³ × 3.14

V(Cr) = 8.18×10⁻²⁴ cm³; the volume of chromium atom

d(Cr) = 52 / 8.18×10⁻²⁴ cm³ × 2 × 6.022×10²³

d(Cr) = 7.15 g/cm³; density of a chromium atom

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the molalities of the following aqueous solutions: (a) 1.036 m sugar (c12h22o11) solution (density of solution = 1.095 g/ml)

Molality = 1.096/(3.029 * 10 ^ -3) = 361.8 m

What is molality?

Molality is the ratio of moles of solute to kilogrammes of solvent (m). The following is the molality formula:

Molality (m) = kilogrammes of solvent / moles of solute.

Molality is the ratio of moles of solute to kilogrammes of solvent (m). Students should keep in mind that the moles are measured in proportion to the mass of the solvent and not the mass of the solution while using the molality formula, which is presented as follows.

Density = m/ volume = 1.095g/ml

Thus, weight of solvent = 1.095g for 1 ml

Moles of solvent = 1.036/342 moles = 3.029 * 10 ^ -3

Molality = 1.096/(3.029 * 10 ^ -3) = 361.8 m

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sodium sulfate binds to water and forms a precipitate to ensure a pure solution of methylene chloride.

When you want to ensure a pure solution of methylene chloride, one way to do it is to add sodium sulfate to bind with the water. This forms a precipitate, which can then be removed from the solution. This leaves you with a purer solution of methylene chloride that can be used for your needs.

Sodium sulfate is a common precipitant in the purification of methylene chloride. When added to water, it forms a precipitate that ensures a pure solution of methylene chloride. This process is known as binding, and it is an essential step in ensuring the quality of the final product.

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To remove any remaining unreacted inorganic component (from the added separating reagent) in the ether solution, two additional washes were performed after extracting benzoic acid into the aqueous solution as its anionic salt.

Benzoic acid must first be extracted from a mixture by adding NaOH, and then any excess NaOH must be removed in order to continue. Further, to get rid of the excess NaOH in the solution, it is washed with water twice or three times.

To reduce the amount of residue and other impurities in the layers, washing is done. The polar impurities, such as the leftover anionic salt of benzoic acid, tend to migrate to the water when washing, giving you a purer organic layer because ether is non-polar and water is polar.

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The pressure when the volume is 3.50 cm³ is 816 kPa

Pressure and volume of a gas have an inverse relationship at constant temperature

The relationship between the volume and pressure of a gas at constant temperature is given by the equation of Boyle's law:

P₁ = 476 kPa

V₁ = 6.00 cm³

V₂ = 3.50 cm³

P₂ = P₁V₁/V₂

P₂ = 476 * 6 /3.50

P₂ = 816 kPa

In conclusion, pressure and volume are inversely related at constant temperature.

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Sunlight, which can be used for solar energy, is an example for renewable resources.

Renewable resources can be replenished and they are nondepletable. Some examples are solar energy,wind power, hydropower, geothermal, and biofuels.

Solar radiation is the source of electric energy. Solar energy is harnessed using a solar power to generate electricity.

It can be active solar or passive solar. It depends on how they capture and distribute solar energy or convert it into solar power

Biofuel is renewable energy source, but not green energy source.

Natural gas is not renewable recourse, because every year is less and less natural gas.

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The urine sample  with a density of 1.08 g/ml  and a volume of 139 ml, has a mass of: 0.39 g

The density formula and the procedure we will use is:

ρ = m/v

Where:

Information about the problem:

Applying the density formula and clearing the mass (m), we get:

m = ρ * v

m = 1.08 g/ml * 139 ml

m = 150.12 g

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 gram of liquid water by 1°C is 1 calorie.

A calorie (cal), or a small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius. It is used to express the amount of energy released in a phase change or chemical reaction.

One small calorie is approximately 4.2 joules.

A calorie is a unit of energy.

A calorie was originally part of the metric system (SI), but now it is replaced with the joule (J).

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The actions by humans that decrease biodiversity and threaten sustainability are;

The term biodiversity has to do with the existence of different species that exist in an ecosystem. In a given ecosystem, there could be several species that exist together. This biodiversity is very much important for the continuity of balance in nature.

The actions by humans that decrease biodiversity and threaten sustainability are;

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The statement that describes a situation that could cause Thomas's data to vary from John's data is as follows: Thomas measures the temperatures only on the sunny days.

An experiment is usually conducted under controlled conditions to test a hypothesis or determine the validity of an existing truth.

According to this question, John wants to prove that the paved area of the playground is hotter than the grassy area of the same playground. He measures the temperature of each area at three different times of the school day and records the temperatures.

However, Thomas wants to replicate this experiment carried out by John. To get the same results after replication, one must ensure to control every variable that was initially controlled.

Therefore, this means that if Thomas measures the temperatures only on the sunny days, he will get a different data from John's data because John measured the temperature on three different times of school days.

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Answer:

Yes, at 801 °C

Explanation:

The correct answer is 2.3×[tex]10^{-11}[/tex]

The auto-ionization constant of water is related to the dissociation constant of an acid or base with its conjugate:

KaKb =Kw=1×10⁻¹⁴

Constant of acid dissociation

Calculations of an acid dissociation constant are used to quantify an acid's potency.

When HA, a chemical species, dissociates into A- and H+ at equilibrium, the acid dissociation constant is utilized. The conjugate base of the acid is the anion.

When both the forward and backward reactions proceed at the same rate, the reaction is in equilibrium.

Acid strength is typically measured using the pKa, which is equal to the negative log of the Ka value. Stronger acids are those with smaller pka values and larger Ka values, respectively. Here is a calculation of acid dissociation.

Ka=1×10⁻¹⁴/4.4×10⁻⁴

=2.3×10⁻¹¹

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Capillary electrophoresis separates charged species according to their charge and size. Since menthone and isomenthone are stereoisomers, they have the same size and charge. As a result, they do not separate because they migrate at the same speed on electrophoresis.

Capillary electrophoresis is an analytical technique that separates ions based on their electrophoretic mobility using an applied voltage. Electrophoretic mobility depends on molecular charge, viscosity, and atomic radius.

Menthone is a mint-flavored monoterpene  that is naturally present in many essential oils. l-Menthone is the most common of the four possible stereoisomers in nature, shown to the right. It is structurally related to menthol and has a secondary alcohol instead of a carbonyl.

Because of the same charge and size they do not separate through  because they migrate at the same speed on electrophoresis.

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Answer:

C - switch the 3 and the 4

The way I did it is by rewriting the equation again but without the numbers and just balancing it myself

Answer: The object moves downward towards gravity

Explanation:  

Gravity exerts a force of 600 N which is greater than the force exerted by air which is 200 N. Hence the object moves in the direction of the greater force applied. The net force is 600- 200= 400N.

Molality and molarity are same = 5.23M

(a)Molarity =  moles of solute /  volume of solution (in L)

​Molarity =  mass of solute /   molecular weight of solute × volume of solution (in L)

Molarity =  11.0 / 20.01 × 0.105

​5.23M = Molarity

(b) Molality =  moles of solute /  volume of solution (in kg)

Molality = mass of solute /   molecular weight of solute × volume of solution (in kg)

Molality = 11.0 / 20.01 × 0.105

​5.23M = Molality

Hence, both molality and molarity are same = 5.23M

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