When menthol (CH3OH) undergoes complete combustion in the presence of oxygen (O2), the products are carbon dioxide (CO2) and water (H2O). The reaction is shown below. __CH3OH + __O2 -> __CO2+ __H2O Which of the following choices lists the coefficients that would correctly balance the equation? a. 2,3,2,4 b. 1,2,1,2 c. 2,2,2,3 d. 1,1,1,1

45,849 calories are given off when 85 gram of steam condenses to liquid water.

Vaporization is always a highly endothermic (heat-absorbing) process because you must break all the intermolecular interactions present inside of the liquid phase.

So,

Q = mass × heat of vapourization

Q = m×ΔH\(_{vap}\)

Q = 85 × 539.4

Q = 45,849 cal

Therefore, 45,849 calories are given off when 85 gram of steam condenses to liquid water.

Learn more about calories here:

https://brainly.com/question/22374134

#SPJ4

When electrons are removed from a lithium atoms, they are removed first from the 2s orbital. The lithium atom has three electrons, with two in the 1s orbital and one in the 2s orbital.

The 1s orbital is closer to the nucleus and therefore more tightly bound, so electrons are more difficult to remove from it. Electrons in the 2s orbital have slightly higher energy and are further from the nucleus, so they are easier to remove.
When electrons are removed from an atom, the process is called ionization. In the case of lithium, removing one electron results in the formation of a lithium ion with a positive charge. Removing additional electrons requires more energy, as the remaining electrons are held more tightly by the nucleus. Understanding the behavior of electrons in atoms and molecules is critical in many areas of chemistry, including materials science, biochemistry, and drug discovery. The study of these topics is ongoing and continues to reveal new insights into the properties and behavior of matter.

learn more about lithium atoms Refer: https://brainly.com/question/24255909

#SPJ11

Answer:

Explanation:0.493 M NaOH means 0.493 mol NaOH/L

mols

mols = ------ x L

L

mols = M x V

In a titration procedure, 40.57 mL of 0.493 M NaOH solution was used. How many mols NaOH did this volume of NaOH solution contain?

mols = M x V

0.493 mols NaOH

mols = ----------------------- x 0.04057 L

L

mols = 0.0200 mols NaOH

Answer:

b

Explanation:

Answer:

D. the quantity of heat that is required to raise 1 g of the sample by 1°C (or Kelvin) at a given pressure

Explanation:

Answer:

This atom has 80 protons and 98 neutrons.

Explanation:

All atoms are composed of a central nucleus in which there are positively charged particles, the protons, and neutrally charged particles, the neutrons, around which other negatively charged particles, called electrons, move.

The atomic number, identified with the letter Z, indicates the number of protons that are present in the nucleus of an atom. The atomic number defines the electronic configuration of the atom and allows the ordering of the different chemical elements in the periodic table.

If a substance has an atomic number of 80, this atom has 80 protons.

The mass number indicates the total number of particles in the nucleus, that is, the sum of protons and neutrons.

mass number = number of protons + number of neutrons

In this case you know that the mass number is 178 and number of protons is 80. Then

number of neutrons=mass number - number of protons

number of neutrons= 98

So this atom has 98 neutrons.

Answer:

China, Mongolia, Russia, and North Korea. They were told to fly at 1400 meters but they flew at 1500 feet making them crash.

Explanation:

Polymer melting point transitions are broader than those of low compounds because of their molecular structure and the forces holding them together.

Low molecular compounds have a simple, defined structure and are hmoleculareld together by intermolecular forces such as van der Waals forces, dipole-dipole interactions, and hydrogen bonding. When these forces are overcome, the compound transitions from solid to liquid.

Polymers, on the other hand, have a much more complex molecular structure with long chains of repeating units. These chains are held together by covalent bonds, which require much more energy to break than the intermolecular forces in low molecular compounds. As a result, polymers have a higher melting point than low molecular compounds.

Furthermore, the long chains in polymers are not perfectly aligned, meaning that some parts of the chains will require more energy to break than others. This leads to a broader melting point transition.

Additionally, some polymers may have different types of covalent bonds, resulting in different melting points for different parts of the polymer. These factors contribute to the broader melting point transition observed in polymers compared to low molecular compounds.

Learn more about, transitions.

https://brainly.com/question/29795678

#SPJ11

The net charge on a molecule of a particular amino acid will be 1- when the pH is higher than the pI (isoelectric point) of the amino acid. In this case, the pI is 7.5, so the net charge will be 1- at a pH higher than 7.5.

The net charge on a molecule of an amino acid depends on the pH of the solution it is in. Amino acids have both acidic and basic functional groups, such as the amino group (-NH2) and the carboxyl group (-COOH). These functional groups can ionize, meaning they can either donate or accept protons depending on the pH of the solution.

The isoelectric point (pI) of an amino acid is the pH at which the net charge on the molecule is zero. At this pH, the number of positive charges (from protonated amino groups) is equal to the number of negative charges (from deprotonated carboxyl groups).

In this case, the pI of the amino acid is 7.5. Since the desired net charge is 1-, the pH must be higher than the pI. At a pH higher than 7.5, the amino acid will have a net negative charge because the carboxyl group will be deprotonated (COO-) while the amino group will remain protonated (NH3+). This results in a net charge of 1- on the molecule.

To learn more about isoelectric refer:

https://brainly.com/question/32069636

#SPJ11

When the enthalpy is positive (H > 0), the reaction is endothermic, that is, it absorbs energy.

When the enthalpy is negative (H< 0), the reaction is exothermic, that is, it releases energy.

Therefore, the correct matches are

Endothermic:

• Positive H Value.

• Absorbs Heat.

• Products have higher energy.

Exothermic:

• Negative H Value.

• Releases Heat.

• Products have lower energy.

Answer:

i think its B C and D.........

It will raise the concentration of OH- (aq), which will cause equilibrium to move in the other direction, causing the concentration of OH- (aq) to fall in order to restore balance.

The Latin term libra, which signifies weight or balance, is where the word equilibrium first appeared. Equilibrium can be visualized as an interesting story that is currently in rest. a vehicle that is going steadily. a chemical process where both the forward and backward rates of reaction are equal.

\(NH3(aq) + H2O (l) < === > NH4+ (aq) + OH- (aq)\)

NaOH is added to system \(: NaOH (aq) === > Na+ (aq) + OH- (aq)\)

(i) It will raise the concentration of OH- (aq), causing equilibrium to shift in a way that lowers the conc of OH- (aq) to attain equilibrium again: thus equilibrium will shift towards reactants (Left) .

(ii) Q\(= [OH-] [NH4+]/ [NH3] [H2O]\)

with increase in concentration of OH- (aq) (stress) ,value of Q​​​​​​​ will increase, since OH- appear in numerator .

(iii) Before equilibrium is re-established, rate of reverse reaction will exceed forward reaction, not vice-versa. As conc. of OH-(aq)decreases in towards reactants.

(iv) When equilibrium is re-established, rate of reverse reaction will be equal to rate of forward reaction, to maintain equilibrium.

To know more about Equilibrium visit :

https://brainly.com/question/29901689

#SPJ4

Answer: 5.59 L

Explanation: I'm pretty sure it's this. I just took this test and got it right. Hope this helps you out! :))

Answer:

5.59 L

Points earned on this question: 4

Explanation:

took the test

Answer:

Explanation:

The volume of a balloon is 30 L at 313K and a pressure of 153KPA What is the volume at 273K and 101.3kPa?

from PV=nRT we can derive

PV/T =P'V'/T' so

153X30/313 = 101.3 X V'/273

OR 153 X 30 X273/(313 X 101.3) =V'

V' = 39.5 L

Moles of diprotic acid present were:

A mole of diprotic acid contains 0.0023 moles \(H_{2}A\).

Law of dilution:

Titrations are conducted using the law of dilution.

The number of moles of solute divided by the arrangement's volume in liters is known as molarity.

The number of moles per liter of solution is referred to as molarity. Additionally, we write it as M. Furthermore, we employ the following equation to determine molarity:

Molarity = moles of solute/liter of solution.

Calculation:

Moles of acid = moles of base

n = M/V

Moles of \(H_{2}A\) = Moles of NaOH used

Therefore,  0.100 x 0.02258L = 0.0023 mol \(H_{2}A\)

Learn more about molarity here,

https://brainly.com/question/15522110

#SPJ4

Answer:

As in ratio?

16 and 12 are both divisible by 4 (4x3 = 12 and 4x4 = 16)

Ratio of dogs to cats from 16 : 12 to

4 : 3

Answer:

4/3

Explanation:

have a nice day

2-Methyl-butan-2-ol is the major product of the reaction of ethyl grignard and propiophenone (ethyl phenyl ketone).

The nucleophile in a keto or aldehyde is coupled to alkyl, ethyl ester, vinyl, or allylic halides in the Fermentation process, an organo combination of carbon monoxide. It takes place in this process for carbon-carbon bonds to form.

It is possible to count the halogen atoms in a halide compound using Grignard reagents. For the chemical examination of several glycerides as well as numerous cross-coupling processes for the synthesis of various dioxide and carbon-heteroatom linkages, Grignard degradation is employed.

To know more about Grignard visit:

https://brainly.com/question/15876201

#SPJ4

The concentration of Ascorbic acid at equilibrium in a 0.25M aqueous solution is 1.985x10⁻³ M.

To determine the concentration of Ascorbic acid at equilibrium in a 0.25M aqueous solution, we need to use the acid dissociation constant values (K1 and Kaz) provided in the question.

K1 = 7.94 x 10⁻⁵ and Kaz = 2.51 x 10⁻¹¹ at 25 °C

We can assume that only the weakly acidic hydroxyl groups will dissociate, so we can use the following equation:

AscH ⇌ H⁺ + Asc⁻

where AscH represents the undissociated form of ascorbic acid and Asc⁻ represents the dissociated form.

We can use the equilibrium expression for the dissociation of a weak acid:

Ka = [H⁺][Asc⁻]/[AscH]

We can rearrange this equation to solve for [Asc-⁻:

[Asc⁻] = (Ka x [AscH])/[H⁺]

We know that in a 0.25M aqueous solution of ascorbic acid, [AscH] = 0.25M.

To determine [H⁺], we can use the equation for the dissociation of water:

Kw = [H⁺][OH⁻]

At 25 °C, Kw = 1.0 x 10⁻¹⁴. Since the solution is neutral, [H⁺] = [OH⁻] = 1.0 x 10⁻⁷ M.

Substituting these values into the equation for [Asc⁻], we get:

[Asc⁻] = (7.94 x 10⁻⁵ x 0.25)/1.0 x 10⁻⁷

[Asc-] = 1.985 x 10⁻³ M

Therefore, the concentration of Ascorbic acid at equilibrium in a 0.25M aqueous solution is 1.985x10⁻³ M.

Learn more about Ascorbic acid: https://brainly.com/question/28783204

#SPJ11

Chlorinated fluorocarbons are considered hazardous substances due to their detrimental impact on the ozone layer, but they are not explicitly listed as hazardous waste.

Chlorinated fluorocarbons (CFCs), despite not being on the list of hazardous waste, are nonetheless regarded as toxic due to their detrimental impact on the ozone layer and the environment. The Montreal Protocol has phased out CFCs, which were once widely used in sectors like refrigeration and as aerosol propellants.

They cause ozone depletion when they are released into the atmosphere. Although CFCs are not classified as hazardous waste, they can have a severe impact on the environment and people's health if they are improperly disposed of or leaked.

The ecosystem and public health may be in danger since CFCs persist in the environment and contribute to air pollution. It's critical to handle and dispose of CFCs properly to reduce their harmful effects on the environment and to prevent further ozone layer damage.

To know more about Chlorinated fluorocarbons:-

https://brainly.com/question/28857945

Answer:

It is true.

Explanation:

Its a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero

Answer:

Over time, the limestone is broken down into its chemical parts and may come back to the surface as volcanic CO2 (in the atmosphere). From the atmosphere, the CO2 might again become part of the biosphere by molluscs or corals absorbing the CO2 to help make their shells

Explanation:

Over a long period of time, we would take a look at the rock "limestone" through the rock cycle. Limestone being a sedimentary rock would be converted to marble, a metamorphic rock if subjected to metamorphic conditions over an extensive period of time.

Answer:

B

Explanation:

reaction order is simply the sum of orders for each reactant.

The rate of a reaction is calculated using the concentrations of reactants and is denoted as option B.

This is a type of relationship which depicts comparison of reaction rates with the reactant concentrations.

This is because the reactants are the ones involved in a chemical reaction to form products.

Read more about Rate law here https://brainly.com/question/16981791

#SPJ6

Answer: B. Fire is releasing energy

Explanation:

1. Sodium bicarbonate is added during the work-up phase because it helps in converting any residual acetic anhydride into acetic acid and neutralizes the unreacted salicylic acid.

Sodium bicarbonate is an effective pH neutralizer. In the preparation of aspirin, after the completion of the reaction, hydrochloric acid is added to lower the pH of the reaction mixture to about 2. At this point, aspirin precipitates as it is relatively insoluble in water. After filtration, the crude product is dissolved in hot water. At this stage, sodium bicarbonate is added to neutralize the acidic impurities like the acetic acid that is produced in the reaction. The impurities become soluble and easily removed from the solution.

2. The complete reaction mechanism for the preparation of aspirin is:

3. The crystals are washed with cold water during the first filtration to remove any impurities that may be present. Coldwater is used to prevent the solubility of aspirin in water. This makes it easier to remove any water-soluble impurities and unreacted salicylic acid that may be present.

4. The percent yield of the reaction is calculated by dividing the actual yield obtained by the theoretical yield that is calculated from the stoichiometry of the reactants involved in the reaction. Factors such as incomplete reactions, losses during filtration, and errors in measurement can all contribute to a lower yield. Therefore, the yield may be less than 100%.

5. The melting point of the newly synthesized aspirin should be around 136-140 °C if the reaction was successful. A lower melting point may be an indication of impurities in the final product. The impurities could be from an incomplete reaction, the presence of water or unreacted salicylic acid.

learn more about aspirin here

https://brainly.com/question/25794846

#SPJ11

Answer:

Triton is the largest natural satellite of the planet Neptune, and the first Neptunian moon to be discovered. The discovery was made on October 10, 1846, by English astronomer William Lasselle. It is the only large moon in the Solar System with a retrograde orbit, an orbit in the direction opposite to its planet's rotation.

Answer:

kilograms x meters2/seconds2

Explanation:

Answer:

kilograms x meters2/seconds2

Explanation:

Answer:

Answer is D.Blue.

Explanation:

The hottest stars tend to appear blue or blue-white, whereas the coolest stars are red.

I hope it's helpful!

Answer:

D.Blue

Explanation:

Answer:

that can be established only by changing a substance's chemical

Explanation:

Answer:

A chemical property is a characteristic of a substance abserved in chemical reactions.

Explanation:

Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay, and chemical stability.

What is pollen in the reproduction cycle of flowering plants?

A pollen grain is a microspore containing the male gametophyte, usually reduced to two undivided cells, each with one haploid (n) nucleus. These cells are surrounded by a very resistant wall, the exine, which generally has apertures, zones with less resistance which will allow the germination of the pollen tube.

Explanation of the reproduction cycle (cf diagram above)

A given species produces flowers bearing stamens. According to species, these flowers can be unisexual (stamens only) or bisexual (stamens and carpels).

The stamen anthers include 4 pollen sacs containing sporogenous cells (diploid=2n). These sporogenous cells undergo meiosis, each producing 4 microspores (haploid=n). Two nuclei are then formed by mitosis : the vegetative nucleus and the generative nucleus. The latter divides to form 2 sperms. Simultaneously the wall of the microspores becomes thicker and takes the characteristic shape of the species : it is a pollen grain (see: What are the morphological characteristics of pollen and spore grains?). In the majority of species, the 4 grains (resulting from the 4 microspores) split up into single grains; in some cases, they remain together (tetrad = group of 4 grains). When mature, pollen grains are released by the opening of the anthers.

A pollen grain is aimed at reaching another flower of the same species, bearing carpels. The ovaries contain ovules, in which meiosis occurs, then mitoses. It results in an embryo sac with 8 nuclei, among which an egg cell and 2 central cells. When a pollen grain arrives on another flower (see : How are the spores and pollen grains transported?), it is received by the stigmas.

The pollen grain germinates through an opening of the wall: the vegetative nucleus develops into a pollen tube which is guided by the style to the ovary, then enters the micropyle of an ovule. The pollen tube releases 2 sperm nuclei into the ovule: one of the sperms fuses with the egg cell into a zygote (2n), while the other sperm fuses with central nuclei and gives rise to albumen (= food source). There are generally several ovules in an ovary : each one can be fertilized by a distinct pollen grain.

Each fertilized ovule and its albumen form a seed that will develop into a new individual of this species. hope it works

Answer:

pollen

Explanation:

you insolent vacuum