which of the following is not correct? 1 mol of o3 has 1.81 x 1024 o atoms 1mol of cl2 has 35.45 g cl 1mol of nacl has 6.022 x 1023 na 1 mole of ca3n2 has 3 moles ca 2

Answer:

compact fluorescent light

During an enzymatic reaction, we expect a decrease in substrate concentration, an increase in product concentration, and a relatively constant enzyme concentration, unless conditions lead to enzyme denaturation

During an enzymatic reaction, we can expect the following changes:

(i) Substrate:

(ii) Product:

(iii) Enzyme:

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Answer:

Heat going into a substance changes it from a solid to a liquid or a liquid to a gas. Removing heat from a substance changes a gas to a liquid or a liquid to a solid.

Liquid → Gas: 

VaporizationGas → Liquid:

 CondensationSolid → Liquid:

 Melting or fusion

Solid → Gas: Sublimation

Explanation:

Linus pauling

1. In 1913, Niels Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values. Electrons move around a nucleus, but only in prescribed orbits, and If electrons jump to a lower-energy orbit, the difference is sent out as radiation

3. J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."

4. Ernest Rutherford found that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. The nucleus is positively charged and surrounded at a great distance by the negatively charged electron

5. In 1932, Chadwick made a fundamental discovery in the domain of nuclear science: he proved the existence of neutrons – elementary particles devoid of any electrical charge.

Linus pauling was the only scientist not related to the development of the atomic theory.

During the 1930s Linus Pauling was among the pioneers who used quantum mechanics to understand and describe chemical bonding–that is, the way atoms join together to form molecules.

Therefore, the correct option is (b) HCl.

Stomach acid, also known as gastric acid, consists mainly of Hydrochloric acid (HCl) dissolved in water.

Hydrochloric acid (HCl) is a strong acid that is naturally produced by the cells lining the stomach. It plays an important role in the digestive process by breaking down food and killing harmful bacteria that may have been ingested. HCl also helps to activate the enzymes that break down proteins, carbohydrates, and fats in the stomach.

The concentration of HCl in stomach acid can vary depending on factors such as the type of food consumed and the individual's health. In healthy individuals, the concentration of HCl in stomach acid can range from about 0.5% to 1.5%.

When the stomach produces too much HCl or the lining of the stomach becomes damaged, it can lead to conditions such as acid reflux, ulcers, and gastritis. These conditions can cause discomfort and pain, and may require medical treatment to manage.

In summary, stomach acid consists mainly of hydrochloric acid (HCl) dissolved in water, and plays an important role in the digestive process.

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Therefore, the pOH of a 0.030 M solution of barium hydroxide is (B) 1.22.

Barium hydroxide is a strong base that dissociates completely in water to form hydroxide ions, according to the given equation below.

Ba(OH)2 (s) → Ba2+ (aq) + 2OH- (aq)

Molarity of barium hydroxide = 0.030M

Critical Data

pH of the given solution = ?

We need to calculate the pOH of a 0.030 M solution of barium hydroxide.

Formula

The relationship between pH, pOH, and [OH-] is:

pH + pOH = 14

pOH = 14 - pH

First, we need to calculate the concentration of OH- ions.

OH- = 2 × 0.030 M

= 0.060 M

Then, calculate the pOH of the given solution as follows:

pOH = 14 - pH

= 14 - (-log [OH-])

= 14 - (-log 0.060)

= 14 + 1.22

= 15.22

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102.89 grams of NaBr is needed to make 2.00 L of 0.50 M solution.

NaBr is the chemical formula for sodium bromide, which is an ionic compound made up of sodium cations (Na+) and bromide anions (Br-).

To calculate the number of grams of NaBr needed to make a 0.50 M solution of 2.00 L, we can use the formula:

mass = moles × molar mass

Where moles = volume × concentration, and the molar mass of NaBr is 102.89 g/mol.

So, moles of NaBr = 2.00 L × 0.50 mol/L = 1.00 mol

mass of NaBr = 1.00 mol × 102.89 g/mol = 102.89 g

Therefore, 102.89 grams of NaBr is needed to make 2.00 L of 0.50 M solution.

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To draw a Lewis structure, you first need to determine the number of valence electrons each atom has. Then, you can place the atoms on the grid and connect them with bonds to form the skeletal structure of the molecule. Next, you can add lone pairs of electrons to each atom to satisfy the octet rule, which states that atoms tend to bond in such a way as to achieve a full valence shell of eight electrons.

For example, let's consider the Lewis structure of water (H2O). Oxygen has six valence electrons, while each hydrogen has one. Thus, the total number of valence electrons in the molecule is 6 + 2(1) = 8.

To draw the structure, we place the oxygen atom in the center of the grid and connect it to each hydrogen atom with a single bond. We then add two lone pairs of electrons to the oxygen atom, which completes its octet. Each hydrogen atom has two electrons, satisfying its duet.

The resulting Lewis structure for water is O-H, with two lone pairs of electrons on the oxygen atom.

Overall, drawing Lewis structures is an essential skill in chemistry as it provides a visual representation of the molecule and helps predict its properties and behavior.

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The number of molecules in 3.5 moles of NaCl is 2.107 × 10²⁴ molecules.

The number of molecules in a substance can be calculated by multiplying the number of moles by Avogadro's number as follows:

no of molecules = no of moles × 6.02 × 10²³

According to this question, 3.5 moles of NaCl are given. The number of molecules can be calculated as follows:

no of molecules = 3.5 × 6.02 × 10²³

no of molecules = 2.107 × 10²⁴ molecules

Therefore, 2.107 × 10²⁴ molecules is the number of molecules in the NaCl.

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Answer: A beta particle is being emitted, not an alpha particle.

Molecular Weight - The grams of solute that are needed is 3.5 g.

What is molecular weight?

The mass of the a given molecule is its molecular mass (m), which is expressed in daltons. Because they contain various isotopes of an element, different molecules of same compound can have distinct molecular masses. According to IUPAC, the related quantity comparative molecular weight is a unitless comparison between the mass of a molecule and the truly united atomic mass unit (also called the dalton).

GIVEN:

c =  Molarity = 0.1 M

M = Molar mass = 350 g/mol

V = Volume of solution = 100 mL = 0.1 L

n = Number of moles

m = Mass of solute

C = n/v

n =0.01 moles

M=m/n

m= 3.5g

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Answer:

B: Radiant

Explanation:

E2021...I got you guys

Answer:

radiant

Explanation:

Answer:

Below

Explanation:

1 meter = 100 cm

Volume =   100 cm * 100 cm * 2 cm = 20 000 cm^3  = 20 000 ml

mass = volume * density

         = 20 000 ml  *  1.42 g/ ml = 28400 g   ( or 28.4 kg)

Answer: The hydroboration of an alkene occurs in TWO CONCERTED STEP which places the boron of the borane on the LESS SUBSTITUTED carbon of the double bond. The oxidizing agent then acts as a nucleophile, attacking the electrophilic BORON and resulting in the placement of a hydroxyl group on the attached carbon. Thus, the major product of the hydroboration oxidation reaction DOES NOT follow Markovnikov's rule.

Explanation:

Hydroboration is defined as the process which allows boron to attain the octet structure. This involves a two steps pathway which leads to the production of alcohol.

--> The first step: this involves the initiation of the addittion of borane to the alkene and this proceeds as a concerted reaction because bond breaking and bond formation occurs at the same time.

--> The second step: this involves the addition of boron which DOES NOT follow Markovnikov's rule( that is, Anti Markovnikov addition of Boron). This is so because the boron adds to the less substituted carbon of the alkene, which then places the hydrogen on the more substituted carbon.

Note: The Markovnikov rule in organic chemistry states that in alkene addition reactions, the electron-rich component of the reagent adds to the carbon atom with fewer hydrogen atoms bonded to it, while the electron-deficient component adds to the carbon atom with more hydrogen atoms bonded to it.

Answer:

Exothermic reaction.

Explanation:

From the question given, we obtained the following:

The equation for the reaction:

A —> C

From the diagram given in the question above, the reactant, A has a higher energy than the product, C. This simply indicates exothermic reaction as the enthalphy change, ΔH will be negative for the reaction.

Enthalpy change, ΔH is simply the difference between the heat of product, Hp and the heat of reactant, Hr i.e

ΔH = Hp – Hr

Since the heat of the product is small, the enthalphy change, ΔH will be negative indicating that heat has be released to the surroundings. This is termed exothermic reaction.

To determine the percent yield of a chemical reaction, we need to compare the actual yield of the reaction to the theoretical yield. The information given in the question is not sufficient to calculate the percent yield. Therefore, the answer is d. The percent yield cannot be determined without knowing the actual yield of the reaction.

The percent yield of a chemical reaction is the ratio of the actual yield to the theoretical yield, expressed as a percentage. The actual yield is the amount of product obtained from the reaction, while the theoretical yield is the maximum amount of product that can be obtained, based on the stoichiometry of the reaction and assuming complete conversion of the reactants. The equation given in the question is a balanced chemical equation, which tells us the stoichiometry of the reaction, but it does not provide information about the amounts of reactants and products used or obtained. Without knowing the actual yield of the reaction, we cannot calculate the percent yield. Therefore, the answer is d. The percent yield cannot be determined without knowing the actual yield of the reaction.

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Answer:

Let us know formula and denotion for Lithium oxide is Li2O.

Explanation:

While on the basis of Electronic configuration:

Lewis structure(for Lithium atom)-Li•

For Oxygen atom- it is 6 dots in the Word O(for Oxygen) but is needed to paired in a pair(of two dots if possible) by the use of either all sides where two dots are presented two sides While one dot is represented on other two sides.

When we come across we might have a simple question how and why the Lithium oxide is Li2O

So,as we know Li(have one electron in its outermost shell),written as Li^+/+1 While Oxygen requires 2 more electrons to stabilize its valency,so it written as O^-2/2-

On combining,Li^+ & O^-2

Exchange and crossing up of valency is done forming Li2O.

Do check the image uploaded for better clarity and understanding.

397.2 kcal.  is the bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4.

One carbon atom makes up the molecule methane(CH4), which has four hydrogen atoms bound to the carbon by single bonds. It is a odorless, colorless, non-toxic, flammable gas and has a melting point of -161°C. CH4 performs three functions: fossil fuel, greenhouse gas, and bacterial metabolite.

For calculating the  bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4.

do as follows.

heat of atomization of solid carbon =170.9kcal

and heat of atomization of four gaseous hydrogen is =4 × 52.1kcal

So, energy for breaking four carbon-hydrogen bonds

= 170.9 + (4 × 52.1) + 17.9 = 397.2 kcal.

Hence, 397.2 kcal.  is the bond dissociation energy for the breaking of all the bonds in a mole of methane, CH4

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Ozonation is more expensive than chlorination and ozone leaves an odor in the water Ozonation causes trihalomethane formation and leaves an odor in the treated water Ozone decomposes quickly and does not provide long-term protection against possible contamination as the.

Ozonated water refers to water that has been treated with ozone gas. Its proponents claim that it offers benefits in both clinical and industrial spaces, from preventing cancer and fighting free radicals in the body to supporting dental health and preserving food safety.

Ozone is a powerful oxidising agent which, when dissolved in water, produces a broad spectrum biocide that destroys all bacteria, viruses and cysts. Ozone water treatment has been used commercially for the treatment of potable water since 1904.

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The diameter of the a terbium-160 nucleus approximately two times greater than the diameter of a neon-20 nucleus.

In terms of genomics, a nucleus is the organ system inside a cell that is membrane-enclosed and houses the chromosomes. The nuclear membrane has a variety of pores that enable the controlled passage of specific molecules (such protein and nucleic acids) to and from the nucleus.

The nuclear envelope, nucleoplasm, or nucleus sap, nuclear matrix, chromatin, and nucleolus are some of the several structures that make up the nucleus. The nuclear membrane, also known as the nuclear envelope, surrounds the nuclear contents in an envelope-like structure.

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Answer:

4676.985 .  grams of silver present in 15.0g of silver sulfate              

Answer:

They can crack or shatter if they are dropped.

Answer:

Mass = 16.4 g

Explanation:

Given data:

Mass of K = 8.50 g

Mass of KCl produced = ?

Solution:

Chemical equation:

2K + Cl₂     →    2KCl

Number of moles of K:

Number of moles = mass/ molar mass

Number of moles = 8.50 g/ 39 g/mol

Number of moles = 0.22 mol

Now we will compare the moles of potassium and potassium chloride.

                  K         :        KCl

                  2         :          2

                0.22      :        0.22

Mass  of KCl:

Mass = number of moles × molar mass

Mass = 0.22 mol × 74.55 g/mol

Mass = 16.4 g

Answer:

because if you do not react to anything you will be a misarable old lady with 5 cats sitting on you .

Explanation: bascially you cant live without reacations to life

Answer:

Decrease of temperature by 62.6°F and 290.15°

Explanation:

First identify change in C: 17 degrees

now convert to Fahrenheit and Kelvin

Fahrenheit: 17 * (9/5) +32 = 62.6°

Kelvin: 17 + 273.15 = 290.15°

Answer:

b.

They can convert the sun's energy into food.

Answer:

its letter A

because Plant cells have a cell wall, but animals cells do not.