What can you tell about a solution by using a phenolphthalein solution?

Answer:

1. Soluble.

2. Electrolyte.

Explanation:

Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.

For example, sodium chloride (NaCl) when mixed with water dissociates into sodium and chloride ions. Thus, salt (sodium chloride) is said to be soluble because it dissolves completely in water.

In Chemistry, dissolution can be defined as the process of dissolving or dissociating a solute in solid, liquid or gaseous phase into fragmented particles by a solvent in order to form a solution. For dissolution to occur in solids, the crystalline structure of the substance must be broken up so as to release ions, atoms or molecules to produce a solution. For liquid and gases, the substance to be dissolved must form a non-covalent bond with the solvent to produce a solution.

Hence, a compound that dissolves in water to produce an aqueous solution is said to be soluble in water. Also, the solute of an aqueous solution that conducts electricity is called an electrolyte.

Explanation:

The acetic acid is a polar compound. The polar molecules have a positive and negative extreme for this reason they are dipoles. The dipoles can attract other dipoles or ions. So, it can establish ion-dipole and dipole-dipole forces with the solute. In addition, acetic acid has a hydroxyl group that can interact with hydrogens or other very electronegative atoms (oxygen, nitrogen and fluor) forming hydrogen bridge junctions.

Answer:

63.2 mA

Explanation:

We all know that:

Current[tex]I = \dfrac{Q}{t}[/tex]

which can be further expressed as:

[tex]I = \dfrac{ne}{t}[/tex]

where;

n = number of electrons

e = charge on electrons

t = time (second)

Then; by replacing the values in the question, we have:

[tex]\dfrac{(9*10^{-4})\times6\times10^{23}\times1.6\times10^{-19}}{22.8\times60}[/tex]

[tex]= 0.06316 A \\ \\ \mathbf{I= 63.2 \ mA}[/tex]

Answer:

See explanation

Explanation:

An unbalanced chemical equation does not show equal number of atoms of each element on both sides of the reaction equation.

a) KOH + H3PO4 -----> K3PO4 + 3H20

b) Zn + AgCl -------> ZnCl2 + Ag

c) NaHCO3 → Na2CO3 + H2O + CO2

d) NH4NO2 ------> N2 + H2O

e) CO2 + KOH -----> K2CO3 + H2O

The pressure of a sample of dry air is held constant 2.25 atm while the temperature is decreased from 100°C to 7.0°C. The original volume of the sample is 43 L. 32 L is the closest to the final volume of the sample?

A law states that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature.

Charles’ law:

[tex]\frac{V_1}{T_1}[/tex] = [tex]\frac{V_2}{T_2}[/tex]

The volume and temperature of a fixed amount of gas at a constant pressure are directly proportional.

To use the equation, the temperature must be in Kelvin.

[tex]V_2[/tex] = [tex]\frac{V_1}{T_1} XT_2[/tex]

[tex]V_2[/tex] = 32 L

[tex]V_2[/tex]= 32 L

Hence, the correct answer is B.

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Step 1: Calculate the molar mass of HF and SnF₂.

For HF

molar mass = (1.008 g/mol × 1) + (19.00 g/mol × 1)

molar mass = 20.008 g/mol

For SnF₂

molar mass = (118.7 g/mol × 1) + (19.00 g/mol × 2)

molar mass = 156.7 g/mol

Step 2: Determine the mole ratio needed.

mole ratio = 2 mol HF : 1 mol SnF₂

Step 3: Calculate the mass of SnF₂ produced by using the mole ratio.

[tex]\text{mass of SnF₂ = 55.0 g HF} × \frac{\text{1 mol HF}}{\text{20.008 g HF}} × \frac{\text{1 mol SnF₂}}{\text{2 mol HF}} × \frac{\text{156.7 g SnF₂}}{\text{1 mol SnF₂}}[/tex]

[tex]\boxed{\text{mass of SnF₂ = 215.4 g}}[/tex]

Answer:

8 neutrons and 6 electrons

Explanation:

Mass number= neutrons + protons

14=x+6

x=14-6

x=8

protons=electrons

6 protons=6 electrons

Answer: [tex]\Delta G[/tex] for the reaction   is -90kJ

Explanation:

The balanced chemical reaction is,

[tex]2H_2S(g)+SO_2(g)\rightarrow 3S_{rhombic}(s)+2H_2O(g)[/tex]

The expression for Gibbs free energy change is,

[tex]\Delta G=[n\times G_{products}]-[n\times G_{reactants}][/tex]

Putting the values we get :

[tex]\Delta G=[3\times G_f{S,rhombic}+2\times G_f{H_2O}]-[2\times G_f{H_2S}+1\times G_f{SO_2}][/tex]

[tex]\Delta G=[(3\times 0kJ/mol)+(2\times -229kJ/mol)]-[(2\times -34kJ/mol) +(1\times -300kJ/mol)][/tex]

[tex]\Delta G=-90kJ[/tex]

Thus [tex]\Delta G[/tex] for the reaction[tex]2H_2S(g)+SO_2(g)\rightarrow 3S_{rhombic}(s)+2H_2O(g)[/tex]   is -90kJ

Answer:

a

Explanation:

it can not break that easily

The mineral has given square chunks when  breaked with a hammer. This indicates that the mineral has a cleavage. Thus, option c is correct.

Minerals are naturally formed inorganic substances which are having a definite chemical composition and highly ordered crystalline structures.  Minerals are deposited in many organic and inorganic matters.

Minerals have some peculiarities such as hardness, cleavage, color etc. Cleavage of a mineral is its tendency to break along crystallographic planes thereby the structural locations of ions and atoms in the crystal creates planes of relative weakness.

Cleavage of crystal results in pieces of square, cubic or other geometrical shapes. in The mineral here, broken into square pieces indicating that the mineral have some weaker crystallographic planes in comparison to other and they cleave.  Thus, c is correct.

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Answer:

2-to produce copies of a DNA molecule

Answer: To be honest I’ll be watching the television or doing interesting and education things like reading books and learning...

Answer:

SLEEPING,NAPPING, LAYING DOWN

Explanation:

the answer is True.

each planet has a significant atmosphere

Answer:

True

Explanation:

bc i know

Answer:

Before you use log you have to multiply the answer of 8.66 mol by 6.02⋅1023 by 3 because the answer of 8.66 mol by 6.02⋅1023 gives you the number of ammonia molecules and in each molecules there are 3 hydrogen atoms present.

Explanation:

Answer:

Explanation:

It is Butanoic Acid

Answer: The gray mice would immediately be eaten by the predators in the area and go extinct.

Explanation:

Natural selection is the differential survival of some members of the population of species which have better phenotypic advantage over others. Such members will survive and reproduce. According to the given situation, white mice were the choice of food for predators and the recessive trait of gray color of gray mice was favoring their survival as they may remain undetected by the predators. But the predators were able to detect the gray mice and changed their food preference from white to gray this way predators will consume all the gray mice and they may extinct in future as it is not possible to change the color of the fur from white to gray so quickly. The adaptation and passage of white trait among the members of the population will occur with a gradual change in successive generations of the population.

Answer:

F = m x a

F = 2400 kg x 3.6 m/s2

F = 8,640 N

Explanation:

Answer:

electrons are always in the outer shell

When an electron moves, it absorbs or produces energy in the form of photons. Electrons surround the nucleus, which is made up of protons and neutrons, and they all form an atom. The exchange or sharing of electrons between atoms is the main cause of chemical bonding.

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The amount of atoms one million carbon atoms or so make up an average human hair.

The smallest unit of matter that may be divided without ejecting electrically charged particles is called an atom. It is also the smallest material with properties resembling chemical elements. As a result, the atom serves as the fundamental unit of chemistry. In a chemical reaction, atoms cannot be formed or destroyed since they are indivisible units.

One inch has 25,400,000 nanometers. The width of a human hair ranges between 80,000 and 100,000 nanometers. The thickest human hair is a million times smaller than an atom. An atom's diameter spans from 0.1 to 0.5 nanometers. The volume of the cells is typically 0.009 cubic microns. More than 150,000 of these germs could fit on the tip of a human hair, and about 150 of them could fit within one Escherichia coli cell.

Thus, the amount of atoms one million carbon atoms or so make up an average human hair.

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Answer:

Carboxylic acids produce hydrogen bonds amongst themselves and possess lower vapor pressure. They generally possess a sour odor. When an acid and a base react with each other to produce salt and water and comprises the combination of hydrogen and hydroxide ions, the reaction is termed the neutralization reaction. Thus, when carboxylic acid reacts with base the reaction is termed neutralization.

On the other hand, esters are known for their pleasant fragrances. They do not produce hydrogen bonds amongst themselves and possess higher vapor pressure. A hydration reaction in which free hydroxide dissociates the ester bonds between the glycerol and fatty acids of a triglyceride, leading to the formation of free fatty acids and glycerol is termed saponification.

Thus, the given blanks can be filled with carboxylic acid, carboxylic acid, esters, esters, esters, and carboxylic acid.

Answer:

error disconnected

Explanation:

Answer:

Benedict's test would determine if the sample is a reducing sugar, and Barfoed's test would determine if it is a monosaccharide or disaccharide.

Answer: The volume of nitrogen gas that is required is 13944 L.

Explanation:

Given values:

Number of molecules of ammonia gas = [tex]7.5\times 10^{26}[/tex]

According to the mole concept:

[tex]6.022\times 10^{23}[/tex] number of molecules are present in 1 mole of a compound

So, [tex]7.5\times 10^{26}[/tex] number of molecules will be present in [tex]\frac{1}{6.022\times 10^{23}}\times 7.5\times 10^{26}=1.245\times 10^3 moles[/tex] of ammonia gas

The chemical equation for the formation of ammonia gas follows:

[tex]N_2 (g) + 3H_2(g) \rightarrow 2NH_3(g)[/tex]

According to the stoichiometry of the reaction:

2 moles of ammonia gas are produced from 1 mole of nitrogen gas

So, [tex]1.245\times 10^3[/tex] moles of ammonia gas will be produced from [tex]\frac{1}{2}\times 1.245 \times 10^3=6.225\times 10^2[/tex] moles of nitrogen gas

At STP conditions:

1 mole of a gas occupies 22.4 L of volume

So, [tex]6.225 \times 10^2[/tex] moles of nitrogen gas will occupy [tex]\frac{22.4 L}{1 mol}\times 6.225\times 10^2 moles=13944 L[/tex] of volume

Hence, the volume of nitrogen gas that is required is 13944 L.

Answer: when concentrations of acid and base are same, pH = pKa

PH = 12.38 pOH = 1.62

Explanation: pKa= -log(Ka)= 12.38. PH + pOH = 14.00

The pH of the solution is 12.38 and the pOH of the solution is  1.62.

Using the Henderson Hasselbalch equation;

pH = pKa + log [A-]/[HA]

Where;

pKa = - log Ka = -log[ 4.2x10-13] = 12.38

[A-] = [PO43–] = 0.285 M

[HA] = [HPO42-] = 0.285 M

Substituting values;

pH =  12.38 + [ 0.285 M]/[ 0.285 M]

pH = 12.38

But;

pH + pOH = 14

pOH = 14 - 12.38

pOH = 1.62

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Answer:

b

Explanation:

Answer:

16.9g of H₂O can be formed

Explanation:

Based on the chemical reaction, 2 moles of H₂ react per mole of O₂. To anser this question we must find limiting reactant converting the mass and volume of each reactant to moles:

Moles H₂ -Molar mass: 2.016g/mol-:

8.76g * (1mol / 2.016g) = 4.345 moles

Moles O₂:

PV = nRT

PV/RT = n

P = 1atm at STP

V = 10.5L

R = 0.082atmL/molK

T = 273.15K at STP

n = 1atm*10.5L / 0.082atmL/molK*273.15K

n = 0.469 moles of oxygen

For a complete reaction of 4.345 moles moles of hydrogen are required:

4.345 moles H2 * (1mol O2 / 2mol H2) = 2.173 moles of O2 are required. As there are just 0.469 moles, Oxygen is limiting reactant

Now, 1 mole of O2 produce 2 moles of H2O. 0.469 moles will produce:

0.469 moles O₂ * (2 moles H₂O / 1mol O₂) = 0.938 moles H₂O.

The mass is -Molar mas H₂O = 18.01g/mol-:

0.938 moles * (18.01g/mol) =

Answer:

The oxygen in morpholine withdraws electrons inductively, which makes protonated morpholine the stronger acid.

Explanation:

In Chemistry, acidity has to do with ease with which hydrogen ion is lost from a substance. Hence in a substance that has greater acidity, hydrogen ion is easily lost as a proton. This easy loss of hydrogen ion is usually caused by a particular reason which is related to the structure of the substance.

In comparing the acidity of protonated morpholine and piperidine, we find out that morpholine has an oxygen atom which withdraws electrons inductively thereby making the N-H bond in protonated morpholine weaker and enhances the loss of a hydrogen ion in protonated morpholine as a proton.

Answer:

This is a total of ten electrons in filled shells

Explanation: