What organelle surrounds and supports plant cells to give them support and structure?
Group of answer choices

Cell Wall

Nucleus

Cell membrane

Water is most  polar solvent that is used for the process of re-crystallization and Ethanol is less polar than water .  Ethanol is miscible with both water and hexane.

Water acts as a polar solvent because it can attracted to either the positive or negative electrical charge on the solute .Hence, water is most polar solvent. Ethanol is less polar to water but  very polar molecule due hydroxy group, which forms hydrogen bond with other molecules.Hexane is a non polar compound.

The two liquids that mix completely together are called as miscible liquids.Ethanol is miscible with water and hexane both.water and ethanol both are the pair of miscible liquids because ethanol and water can mix together completely and we get a clear colorless liquid.ethanol can mixed in water in any proportion without any limit.

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If you have purchased used machinery and it does not come with maintenance instructions, you should contact the manufacturer or check their website.

New machinery always come with maintenance instructions.

With an used machinery that is not always a case.

Machinery manufacturer is the best place to get help for some issues.

The manufacturer can provide necessary informations about maintenance instructions and other important informations about their products.

Another place to find necessary informations is website of the manufacturer of the used machinery. Website usually have many others usefull informations about the product. Many manufacturer optimize their information pages.

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The specific gravity of the solution is 1.07, which contains 5.34g for a 5.00ml sample.

Density of a substance is

Density = Mass / Volume

             = 5.34/5

             = 1.07

Density of water = 1

Specific gravity = Density of substance/density of solvent

Specific gravity = 1.07 / 1

Specific gravity = 1.07

Specific gravity, often known as relative density, is the ratio of a substance's density to that of an industry standard.

If a material has a relative density that is less than 1 compared to the reference, it is less dense than the reference; if it is larger than 1, it is denser. Identical volumes of the two substances have the same mass if the relative densities are equal, or exactly 1.

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Answer:

0.036g

Explanation:

I've learned about sig figs

Polypeptides : Peptides are tiny chains of amino acids connected by the peptide bonds.

Function of polypeptides : Polypeptides aid make up proteins by bonding many amino acids conjointly.

Amino acids are organic components that comprises both amino and carboxylic acid functional groups.

Sequence of amino acids are known as polypeptides. The covalent bonds that hold on to amino acids conjointly are known as peptide bonds.

Types of amino acids : nonpolar, polar, negatively charged, and positively charged.

According to question

Linking amino acid monomers together to form a polymer requires the formation of peptide bonds.

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2.50 x 10⁻³ mol naoh are present in 25.0 ml of a 0.1000 m naoh solution

Here Molarity formula is used to find moles in solution

Molarity = no of moles of solute/volume of solution

M= molarity, V = volume , n= no of moles

M=0.1000m , V=25.0ml  , n=?

M=n/v(ml)×1000

n=MV/10³ = 0.1000×25.0/10³ = 2.50 x 10⁻³ mol

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Explanation:

The graphite anodes are suspended into the brine. During electrolysis, Cl ions are oxidized at the anode and chlorine gas goes out of the cell, while sodium ions are reduced at the mercury cathode forming sodium amalgam. ... Hydrogen gas is obtained as a by–product at the cathode.

Answer:

Explanation:

b. 3 sig figs

c. 3 sig figs

d. 2 sig fig

e. 4 sig fig

f. 4 sig fig

g. 4 sig fig

h. 2 sig fig

i. 5sig fig

To make sure the data they collect are accurate

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When the renal tubules secrete hydrogen ions into the tubular fluid, they reabsorb sodium at the same time.

What are renal tubules?

The tiny or microscopic structural and functional component of the kidney called a nephron. A renal corpuscle and a renal tubule make up its structure. From the capsule protrudes the renal tubule.

One of the many microscopic tubes in the kidneys that replenishes the blood with nutrients, fluids, and other substances that have been removed from it but are still required by the organism. Urine is created in the renal tubules from any leftover fluid and trash.

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Answer:

0.130058

Explanation:

divide the mass / volume by 27.68

The distance covered by the jet airplane in 10 minutes is 124.582 Km

Speed is the distance travelled per unit. Mathematically, it can be expressed as:

Speed = distance / time

With the above formula, we can obtain the distance. Details below

The following data were obtained from the question:

Speed = distance / time

Cross multiply

Distance = speed × time

Distance = 746 × 0.167

Distance = 124.582 Km

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Differences between bacteria and viruses is that viruses do not have cell wall.

Only bacterial infections can be treated with antibiotics, viruses do not respond to antibiotics.

Antibiotics attack the cell wall or coating surrounding bacteria. There are two types of cell wall: Gram-positive and Gram-negative.

For example antibiotic penicillin:

After it was discovered, penicillin was very effective in destroying the bacterium Staphylococcus aureus. Today, because of natural selection in Staphylococcus aureus populations, they are resistant to antibiotics based on penicillin (Staphylococcus aureus bacterium is resistant to methicillin, β-lactam antibiotic of the penicillin class).

Staphylococcus aureus is a Gram-positive, round-shaped bacterium which causes a skin infections.

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answer:

d. the study of heat flow.

explanation:

thermodynamics is the study of the relations between heat, work, temperature, and energy.

Answer:

x = 1/2 y = 1

Step-by-step explanation:

Now form equation for y,

→ 6x - y = 2

→ y = 6x - 2

Then the value of x will be,

→ -4x + 3y = 1

→ -4x + 3(6x - 2) = 1

→ -4x + 18x - 6 = 1

→ 14x = 1 + 6

→ x = 7/14

→ [ x = 1/2 ]

Hence, the value of x is 1/2 (or) 0.5.

Now the value of y will be,

→ y = 6x - 2

→ y = 6(1/2) - 2

→ y = 3 - 2

→ [ y = 1 ]

Hence, the value of y is 1.

To make a water insoluble substance water soluble, a chemist can add groups with bonds between atoms with different attraction for electrons.

A water soluble drug or substance is easier to be taken up in your digestive system.

Positive and negative are attracted which makes a cohesive structure. When polar compounds or ions gets added to the water, these compounds breaks down or degrades into smaller components. They also might dissolve to become the part of the solution.

The partial charges of water attracts the various parts of a compound. When attraction occurs, it gets more soluble in the water.

Thus, by adding groups with bonds between atoms with different attraction for electrons, substance can become water soluble.

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The planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune (option B).

A scale model is a three-dimensional copy or representation of something in which all parts have dimensions in the same proportion to that of the original.

In the solar system, there are nine planets. These nine planets in a decreasing order of their size (diameter) are as follows:

Based on the original diameters of the planets, it can be said that the planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune.

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Answer:

neptune

Explanation:

Answer:

Correct answer is “a reaction occurs” because in the readings it says specifically chemical changes can be reversed but it’s not easy.

Explanation:

A 0.372-g sample of sodium hydroxide(s) is added enough water to make 250.0 ml of solution. the ph of this solution is 12.571

gram of sodium hydroxide X 1 mol of NaoH in volume/total vol of NaoH= 0.093ml/250ml=0.372= 12.571

Other names for sodium hydroxide include lye, soda, and caustic soda. Sodium hydroxide is a white, crystalline, odorless solid at room temperature that draws moisture from the atmosphere. It is a product of synthetic manufacturing. It produces significant amounts of heat when dissolved in water or neutralized with acid, which could be enough to ignite combustible objects. It is very corrosive to use sodium hydroxide. In most cases, sodium hydroxide is utilized as a solid or diluted to a 50% solution. The production of soaps, rayon, paper, explosives, dyestuffs, and petroleum products all employ this chemical.

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Calcium ions=0.502 mol, nitrate ions= 1.004 mol,oxygen atoms =3.012 mol.

Calcium nitrate Ca(NO3)2 = 0.502 mol

the required equation for the given question is below:

Ca(NO3)2 —-> 2N03-  + Ca2+

contains :2 nitrate ions per mole of Ca(NO3)2.,

1 calcium ion per mole of Ca(NO3)2.,

6 oxygen atoms per mole of Ca(NO3)2.

Calcium ions therefore equal 0.502 mol,

nitrate ions equal 2 x 0.502 mol

                    = 1.004 mol

oxygen atoms equal 6 x 0.502 mol

                     = 3.012 mol .

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Answer:

D.

Explanation:

An Arrhenius acid is a compound that increases the H+ ion concentration in a water solution.

The empirical formula of emerald is Be3Al2Si6O18.

The empirical formula of a compound tells us about the simplest ratio between the atoms present in the compound.

We are given that emerald consists of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen.

So, we need to first convert the percentages into number of moles of the elements.

Let us assume that there is 100 grams of emerald.

Hence, the mass of each element in it is 5.030 grams beryllium, 10.040 grams aluminum, 31.351 grams silicon and 53.579 grams oxygen.

To calculate the moles, we need to divide their given mass by their molar mass

Moles of beryllium(Be) = 5.030/9 = 0.55

Moles of aluminium(Al) = 10.040/27 = 0.37

Moles of silicon(Si) = 31.351/28 = 1.107

Moles of oxygen(O) = 53.579/16 = 3.34

Now, we need to divide the moles by the lowest common number among them i.e, 0.37.

So, 0.55/0.37 = 1.5

0.37/0.37 = 1

1.107/0.37 = 3

3.34/0.37 = 9

So, the ratio of Be:Al:Si:O comes out to be 1.5:1:3:9.

As the ratio contains 1.5, so we need to multiply it by 2 to get a whole number.

So, (1.5:1:3:9) x 2 = 3:2:6:18

Thus, the empirical formula of emerald is Be3Al2Si6O18.

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The empirical formula of emerald is [tex]Be_{3}Al_{2}Si_{6}O_{18}[/tex].

The empirical formula of a compound tells us about the simplest ratio between the atoms present in the compound.

We are given that emerald consists of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen.

So, we need to first convert the percentages into number of moles of the elements.

Let us assume that there is 100 grams of emerald.

Hence, the mass of each element in it is 5.030 grams beryllium, 10.040 grams aluminum, 31.351 grams silicon and 53.579 grams oxygen.

To calculate the moles, we need to divide their given mass by their molar mass

Moles of beryllium(Be) = [tex]\frac{5.030}{9} = 0.55[/tex]

Moles of aluminium(Al) = [tex]\frac{10.040}{27} = 0.37[/tex]

Moles of silicon(Si) = [tex]\frac{31.351}{28} = 1.107[/tex]

Moles of oxygen(O) = [tex]\frac{53,579}{16} = 3.34[/tex]

Now, we need to divide the moles by the lowest common number among them i.e., 0.37.

So, [tex]\frac{0.55}{0.37} = 1.5[/tex]

[tex]\frac{0.37}{0.37} = 1[/tex]

[tex]\frac{1.107}{0.37} = 3[/tex]

[tex]\frac{3.34}{0.37} = 9[/tex]

So, the ratio of Be:Al:Si:O comes out to be 1.5:1:3:9.

As the ratio contains 1.5, so we need to multiply it by 2 to get a whole number.

So, (1.5:1:3:9) x 2 = 3:2:6:18

Thus, the empirical formula of emerald is [tex]Be_{3}Al_{2}Si_{6}O_{18}[/tex]..

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It is a good idea to put input values and output values into separate sheets when solving a complex problem if it improves readability and usability. this statement is false.

The definition of a problem is something that needs to be resolved or an unpleasant or undesirable condition that needs to be corrected. An example problem is an algebraic equation. An example problem is when it's raining and you don't have an umbrella.

The most common meaning is a diplomatic alternative to "problem". The word "problem" can be too negative, especially in the world of politics and business. It focuses on the bad side of things and suggests that someone made a mistake. The main difference between a task and a problem is that a task is a difficult task that a person wishes to complete, whereas a problem is difficult to manage, understand, and impedes an individual's progress.

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One serving of peanuts has about 166.000 calorie then in joules are  695,000 Joule means  694.544 Joule and 'joule is the amount of energy exerted when a force of one newton is applied over a displacement of one meter'

A calorie is a unit of energy in nutrition, calories refer to the energy people get from the food and drink they consume, and the energy they use in physical activity and calories are listed in the nutritional information on all food packaging many weight loss programs center around reducing the intake of calories.

Here given data is peanuts = 166.000 calories given in the calories then we have to find in joules = ?

In the thermochemical calories to joule we have one given value i.e

1cal th = 4.184 J means here 1 cal  =  4.184 J

So, we have to calculate 166.000 calories

Then, 4.184×166.000

= 694.544 J

Which is approximately 695,000 J

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Henderson's Hasselbalch equation for the propanoic acid

[tex]solution \: is \: pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]

This is called known as the Henderson- Hasselbalch equation which relates the pH of an acid aqueous solution with the acid dissociation constant.

[tex]pH=pK _{a } + log \frac{Conjugate \: base}{acid}[/tex]

The Henderson-Hasselbalch equation is derived from the definition of the acid dissociation constant as follows.

Consider the hypothetical compound HA in water.

[tex]HA +H _{2}O→ H _{3} O ^{ + } + A^{ - } [/tex]

The acid dissociation constant of HA,

[tex] [H _3O ^{ + }] = K _a \times \frac{HA}{[A ^{ - } ] }[/tex]

[tex]log [H _3O ^{ + }] = logK_a+log\frac{HA}{[A ^{ - } ] }[/tex]

Multiply both sides of the equation by -1.

[tex]-log[H_3O ^{ + }]=-logK_a-log\frac{HA}{[A ^{-} ] }[/tex]

[tex]pH=pK _{a }+log \frac{[A ^{ - } ] }{HA}[/tex]

[tex][HA] = [A-][/tex]

[tex]pH =pKa +log1[/tex]

[tex]pH = pKa + 0[/tex]

pH=pKa

pKa value of compounds can be determined experimentally using its relation with pH.

According to the Henderson-Hasselbalch equation, when the concentrations of the acid and the conjugate base are the same, i.e when the acid is 50% dissociated, the pH of the solution is equal to the pKa of the acid.

[tex]pK _{a } \: value \: for \: propanoic \:acid \: = 4.874[/tex]

[tex]Let \: propanoic \: acid \: be \: HA.[/tex]

[tex]Let \: propionate \: be \:A ^{ - } .[/tex]

So Henderson-hasselbalch equation for the propanoic acid solution is,

[tex]pH=pK _{a } + log \frac{[A ^{ - } ] }{HA}[/tex]

[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]

Therefore, Henderson's Hasselbalch equation for the propanoic acid solution is

[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}.[/tex]

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Answer: Nuclear fusion

Explanation:

I think

Answer:

Yes is my final answer

Explanation:

1. Scrap iron is used to displace copper because it is a more reactive, cheaper metal, making it a cost-effective way to produce copper. Scrap or old iron is also easier to obtain, as it is one of the world’s most recycled scrap metals. During a displacement reaction, iron reacts with a copper sulphate solution. This causes the iron ion to displace the copper to form iron sulphate, with solid copper being produced as a result.

Rutherford proposed the atomic model nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant.

The atomic nucleus is the tiny center of an atom that contains practically all its mass. Ernest Rutherford put forward the nuclear structure of the atom, discovered alpha and beta rays, and also projected the laws of radioactive decay. Complete step by step answer we must know that the nuclear theory of the atom was put forward by Rutherford. the law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.

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If a chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions then the best approximate value of new pH is 5.

When only pure water is there.

H₂O ⇌ H⁺ + OH⁻

pKw = pH + pOH

14 = pH + pH ( This is because the value of pH and pOH is same in water and we need to consider pH here.)

14 = 2pH

pH= 14/2 = 7

So, pH of pure water is 7.

Concentration of hydrogen ions in pure water can be calculated using the equation

pH = -log[H⁺]

7 = -log[H⁺]

[H+] = 10⁻⁷ M

So, the concentration of hydrogen ions in pure water is 10⁻⁷ M.

Now, the chemist added a chemical to this pure water such that there is   100- fold increase in concentration of hydrogen ions.

So, the new concentration of hydrogen ions is calculated as shown below.

[H⁺] = 100 ×10⁻⁷ M

      = 10⁻⁵ M

The new concentration of hydrogen ions is 10⁻⁵ M.

Now, the new pH can be calculated using the formula

pH  = -log[H⁺]

      = -log[10⁻⁵]

      = -×-5log[10]        

       = 5×1

       = 5

So, the new pH value = 5.

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