Which of the following
best describes the cell
wall of a plant cell?
A. sturdy
B. unstable
C. flimsy
D. weak

Answer:

a. 1 mole O2

b. 2 moles H2O

Explanation:

a. 2 moles H2 x [tex]\frac{1 mole O2}{2 moles H2}[/tex] = 1 mole O2

B. 2 moles H2 x [tex]\frac{2 moles H2O}{2 moles H2}[/tex] = 2 moles H20

Answer:

Look in explanation

Explanation:

I have shown the Lewis diagram as well as the square and sphere representation.

Conversion from one unit to another requires the use of a conversion factor.

We are required in the problem to express our result in the form; a x 10^b

To convert from μm to m, the conversion factor to use is [tex]1 * 10^-6[/tex]

So;

1 μm = [tex]1 * 10^-6[/tex] m

0.16 μm =  0.16 μm * [tex]1 * 10^-6[/tex] m/1 μm

= [tex]1.60 * 10^-7[/tex] m

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Answer:

CH3

Explanation:

Answer:

cyclohexene

One molecule of cyclohexanol should produce one molecule of cyclohexene. One mole (mol) of cyclohexanol should produce one mole of cyclohexene.

Explanation:

The major products of the complete hydrolysis of disaccharides and polysaccharides are three monosaccharide units: glucose, fructose, and galactose.

Answer: What happens when a single molecule is replaced by a hydrogen by an oh group

Explanation:

Answer:

The relative reactivity of carboxylic acid derivatives toward nucleophile substitutions is related to the electronegative leaving group's ability to activate the carbonyl. The more electronegative leaving groups withdraw electron density from the carbonyl, thereby increasing its electrophilicity.

Answer:

give me brainliest

Explanation:

The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron. The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron.

Answer:

The shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud

Explanation:

i am not sure but i hope it will help you

Answer:

A titration is an analytical procedure used to determine the concentration of a sample by reacting it with

a standard solution. One type of titration uses a neutralization reaction, in which an acid and a base

react to produce a salt and water.

In a titration, the standard solution goes in a buret, which is a piece of glassware used to measure the

volume of solvent to approximately 0.1 mL of accuracy. The solution that you are titrating goes in an

Erlenmeyer flask, which should be large enough to accommodate both your sample and the standard

solution you are adding.

Answer:

Explanation:

Image result for describe five factors which affect propagation of sound.. please describe in details.​

There are several important factors which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. These are discussed separately below. This refers to the spreading of sound energy as a result of the expansion of the wavefronts.

Answer:

278 atm

Explanation:

We're gonna use this formula: [tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]

P₁ = 177 atm

T₁ = 298 (Convert Celsius to kelvins by adding 273)

P₂ = ?

T₂ = 468 (195 + 273)

We got

[tex]\frac{177}{298} =\frac{P_2}{468}[/tex]

We can cross-multiply or multiply both sides by 468

I'm gonna go with the latter

[tex](468)\frac{177}{298} =\frac{P_2}{468}(468)[/tex]

[tex]P_2 = \frac{(468)(177)}{298}[/tex]

[tex]P_2 = 277.973[/tex]

Answer:

[tex]\boxed {\boxed {\sf 278 \ atm}}[/tex]

Explanation:

We are asked to find the gas pressure when the temperature of a gas is changed. We will use Gay-Lussac's Law, which states the pressure of a gas is proportional to the temperature of the gas. The formula for this law is:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

Initially, the pressure is 177 atmospheres and the temperature is 25 degrees Celsius or 298 Kelvin.

[tex]\frac {177 \ atm}{298 \ K}=\frac{P_2}{T_2}[/tex]

Then, the gas cylinder is exposed to fire and the temperature is raised to 195 degrees Celsius or 468 Kelvin, but the pressure is unknown.

[tex]\frac {177 \ atm}{298 \ K }=\frac{P_2}{468 \ K}[/tex]

We are solving for the new pressure, so we must isolate the variable P₂. It is being divided by 468 Kelvin. The inverse operation of division is multiplication, so we multiply both sides of the equation by 468 Kelvin.

[tex]468 \ K *\frac {177 \ atm}{298 \ K}=\frac{P_2}{468 \ K}*468 \ K[/tex]

[tex]468 \ K *\frac {177 \ atm}{298 \ K}=P_2[/tex]

The units of Kelvin cancel.

[tex]468 \ K *\frac {177 \ atm}{298 \ K }=P_2[/tex]

[tex]468 * 0.593959731544 \ atm = P_2[/tex]

[tex]277.973154362 \ atm = P_2[/tex]

The pressure in the cylinder after exposure to fire is approximately 278 atmospheres.

Answer:

Answer is b gravity only

Answer:

This is not a true solution because the colloidal dispersion is not completely homogeneous, and it does not have uniform properties throughout.

Explanation:

hope i helped

Answer:

HCl(g) + H₂O(l) -> Cl⁻(aq) + H₃O⁺(aq)

Explanation:

Usually when we have HCl in a lab, it's already dissolved in water. It's just HCl(aq). If we want to look at adding pure HCl, that'll be a gas. We should note that HCl is a strong acid that will break apart completely. One might not say that this is a chemical reaction so much as a dissociation. Strong acids are proton donors and form hydronium cations in aqueous solution.

The balanced equation for the ionization of hydrochloric acid (HCl) in water, forming hydronium ions (H₃O⁺) and chloride ions (Cl⁻) is:

HCl(aq) + H₂O(l) → H₃O+(aq) + Cl⁻(aq). The symbol for hydrochloric acid is HCl. H₂O stands for water. The hydronium ion, or H₃O+, is created when the acid HCl gives a proton (H+) to a water molecule.

The chloride ion, which is what's left of the HCl molecule after it's been ionized, is denoted by the symbol Cl-.

The reaction can move both in the forward (ionization) and backward (recombination) directions, according to the double arrow ().

Thus, The balanced equation for the ionization of hydrochloric acid (HCl) in water, forming hydronium ions (H₃O⁺) and chloride ions (Cl⁻).

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Answer:Water pollution can come from a variety of sources. Pollution can enter water directly, through both legal and illegal discharges from factories, for example, or imperfect water treatment plants. Spills and leaks from oil pipelines or hydraulic fracturing (fracking) operations can degrade water supplies.

Explanation:

Answer:

here is the answer

Explanation:

Diffusion is a process of passive transport in which molecules move from an area of higher concentration to one of lower concentration.

A. 0.2 mole of HCl is needed for the reaction

B. The molarity of NaOH solution is 0.04 M

C. The molarity of HCl is 0.043 M

Molarity is defined as the mole of solute per unit litre of the solution.

We'll begin by calculating the number of mole of NaOH in the solution.

Volume = 0.1 L

Molarity of NaOH = 2 M

Mole = Molarity x Volume

Mole of NaOH = 2 × 0.1

Finally, we shall determine mole of HCl.

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

1 mole of NaOH required 1 mole of HCl.

Therefore, 0.2 mole of NaOH will also require 0.2 mole of HCl.

Thus, 0.2 mole of HCl is needed for the reaction.

HCl + NaOH —> NaCl + H₂O

From the balanced equation,

Mole ratio of the acid, HCl (nA) = 1

Mole ratio of the base, NaOH (nB) = 1

From the question given above above,

Volume of acid, HCl (Va) = 0.025 L

Molarity of acid, HCl (Ma) = 0.05 M

Volume of base, NaOH (Vb) = 0.034 L

Mava / mbvb = na/nb

0.05 x 0.025 / Mb x 0.034 = 1

0.00125 / Mb x 0.034 = 1

Cross multiply

Mb x 0.034 = 0.00125

Divide both side by 0.034

Mb = 0.00125 / 0.034

Mb = 0.04 M

Therefore, the molarity of NaOH is 0.04 M

From the question given above above,

Volume of base, NaOH (Vb) = 0.054 L

Molarity of base, NaOH (Mb) = 0.1 M

Volume of acid, HCl (Va) = 0.125 L

Mole ratio of the acid, HCl (nA) = 1

Mole ratio of the base, NaOH (nB) = 1

Mava / mbvb = na/nb

Ma x 0.125 / 0.1 x 0.054 = 1

Ma x 0.125 / 0.0054 = 1

Cross multiply

Ma × 0.125 = 0.0054

Divide both side by 0.125

Ma = 0.0054/0.125

Therefore, the molarity of the HCl is 0.043 M

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Answer:

Hydrochloric acid reacts with the materials to produce bubbling, or fizzing, a gas, and heat.

Explanation:

We can separate out a small sample of the dyes for identification purposes, but not separate the entire mixture by using chromatography.

Chromatography is a technique of separation of mixtures of liquids according to the nature of those liquids.

To get the process started, the mixture is dissolved in a substance called the mobile phase, which carries it through a second substance called the stationary phase.

The different components of the mixture travel through the stationary phase at different speeds, causing them to separate from one another. The nature of the specific mobile and stationary phases determines which substances travel more quickly or slowly, and is how they are separated. These different travel times are termed retention time.

Therefore, We can separate out a small sample of the dyes for identification purposes, but not separate the entire mixture by using chromatography.

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To solve such this we must know the concept of acid-base reaction. Therefore, NH[tex]_3[/tex] is the compound that will react to the greatest extent with boron trifluoride (BF[tex]_3[/tex]) in a Lewis acid-base reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

NH[tex]_3[/tex] is an example of a Lewis Base that will react extensively with BF[tex]_3[/tex] to form the compound NH[tex]_3[/tex] + BF[tex]_3[/tex] → [B (NH[tex]_3[/tex])F[tex]_3[/tex]].

Therefore, NH[tex]_3[/tex] is the compound that will react to the greatest extent with boron trifluoride (BF[tex]_3[/tex]) in a Lewis acid-base reaction.

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Answer:

Gas

Explanation:

Do not put any sub- stance into the flame unless specifically instructed to do so. Never reach over an exposed flame. Light gas (or alcohol) burners only as instructed by the teacher.

Answer:  36.1%

Explanation:  The molar mass of the complete molecule, CuSO4*5H2O is 249.6 g/mole.  The molar mass of just the water (5H20) is 90 g/mole.  Assume 1 mole of CuSO4*5H2O, the percent water would be:

90g H2O/249.6g CuSO4*5H2O = 0.361 or 36.1%

Answer:

1.5055×10²⁴

Explanation:

................................

Boyles law!! Pressure is inversely proportional to volume!

Explanation:

Magnesium chloride = MgCl₂

aluminum nitrate= Al(NO₃)₃

ammonium sulfate=( NH₄)₂SO₄

Answer:

3.55e-7

Explanation:

Answer:

120

Explanation: