Add curved arrows to the reactants in this reaction. A double-barbed curved arrow is used to represent the movement of a pair of electrons. Draw curved arrows. :O: : ОН H-Ö: H H

Answer:

The thicker the metal, the harder it is for the magnet to attract more paper clips.

Explanation:

There exists a relationship between the paper and the paper clip. The more is the thickness of the paper the stronger the paper clip will be. As size has the ability to attract and affect.

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Answer:

its D. answers many questions about atoms.

The modern-day quantum model of the atom is better than John Dalton’s model because it "  answers many questions about atoms."

This concept also referred to as the quantum mechanical and wave mechanical model, would be the cornerstone of contemporary atomic theory. The fact that an electron inside an atom may only exist in a limited range of states or energy is analogous to a standing wave.

Dalton proposed that the concept of atoms will be used to explain the laws of conservation of mass as well as definite proportions. Imagining atoms as "solid, massy, hard, impenetrable, moving objects," he claimed that almost all matter would be composed of these tiny, indivisible particles.

Dalton also stated that almost no atom might be formed, converted into another, as well as destroyed. The complex shapes of orbitals also known as electron clouds used in the quantum mechanical atomic model are areas of space where an electron is likely to be present. So rather than being based on certainty, this model would be probability based.

Therefore, the correct answer will be option (D)

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Answer:

-1

Explanation:

electrons are negative

\(7.8 \: mol = \frac{6.02 \times {10}^{23} atoms}{1 \: mol} = 4.6956 \times {10}^{24} \: atoms\)

round as you wish.

The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Answer:

1 Once proteins, fats and carbohydrates are digested, absorption takes place in the small intestine.

2 if we eat food we get energy, but if there weren't chemical reaction in your body nothing happens.

Explanation:

1 Most of the digestion occurs in the first part of the small intestine while the absorption of broken down nutrients, water, vitamins, and minerals occurs in the rest of it.

Answer:

They don't have to deal with the Earth's atmosphere

Explanation:

Space telescopes have the advantage of being above the blurring effects of the Earth's atmosphere

Answer: 1) The answer is: c) protons and neutrons.

2) The answer is: a) electrons.

Explanation:

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, Much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Electron has -1 charge while proton has +1 charge. Neutron is neutral.

Much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

Therefore, much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

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From the balanced redox reaction, Fe²⁺ + NH₄⁺ (aq) + 3H₂O → 4Fe( s) + NO₃⁻(aq) + 10 H⁺, the coefficients in front of Fe and H⁺ are equal to the 4 and 10 respectively.

A redox reaction is one of reaction which involved in tansfer of electrons and here simultaneously one component is oxidised and other one reduced. Balanced equation or chemical reaction means equal moles of reactants and products in reaction. We have a redox reaction written as, Fe²⁺ (aq) + NH₄⁺ (aq) → Fe(s) + NO₃⁻(aq)

We have to balance the above reaction and determine the cofficient of Fe and H⁺ . Consider half-reduction reaction, add 2e⁻ in reactant side, 2e⁻ + Fe²⁺ → Fe(s) --(1)

Half-oxidation reaction involved the following step, NH₄⁺ (aq) → NO₃⁻ (aq)

Add 3 water molecules to balance half oxidation reaction,

NH₄⁺ (aq) + 3H₂O → NO₃⁻(aq) + 10 H⁺

Again add 8e⁻ in product side for balancing, NH₄⁺ (aq) + 3H₂O → NO₃⁻(aq) + 10 H⁺ + 8e⁻ --(2)

Now, multipling equation (1) by 4 and add in equation (2),

8e⁻ + 4Fe²⁺ + NH₄⁺ (aq) + 3H₂O → Fe(s) + NO₃⁻(aq) + 10 H⁺ + 8e⁻

The final balanced reaction is Fe²⁺ + NH₄⁺(aq)+ 3H₂O → 4Fe( s) + NO₃⁻(aq) + 10 H⁺. Hence, required cofficient value for Fe is 4 and H⁺ is 10.

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After an organic reaction involving an aqueous solution, the organic solution might be washed with a saturated sodium chloride aqueous solution to reduce the amount of water in the organic solution.

Brine (saturated NaCl), the purpose of brine wash is to remove large amounts of water than may be dissolved in the organic layer. Washes can be considered to wash away impurities by moving the impurities into a different layer while the desired compound stays in its first layer.

Let us now see, how do you make brine? (for example)

It's simple soaking food in a salt water solution. Sometimes for extra flavor, you might add other ingredients, like sugar, herbs, or spices. But all you really need for a brine is salt and water, once the food that you're soaking absorb the brine, making the food more moist and fluffy, food loses its liquid during cooking, but since brined it starts out with more.

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Answer:

Alkaline earth metals

Explanation:

Group 2 has 2 valence electrons that they lose when being ionized, thus making  their charge 2+.

Answer:

alkali earth metals

Explanation:

ed tell chem

Answer:

Explanation:

hi

Answer: 19 grams

Explanation:

percent by mass = (mass of part)/(mass of whole) * 100

this means that in this question, 12 = x/160 * 100, where x is the amount of NaCl.

this means 12/100 = x/160, and thus x = (160)(12/100)=19.2 grams

The closest option is B.

Answer:

Second Option: 19 grams

Explanation:

Total solution weight: 160 grams

percent of NaCl in the solution: 12%

You take these two numbers and multiply them with 12 being over 100:

160 * \(\frac{12}{100}\) = 19.2 grams

and then just round to the nearest whole number: 19 grams

Answer:

Mercury

Explanation:

mercury, and it's the only metal that normally exists on Earth as a liquid.

Answer: False

Explanation:

Answer:

the answer is true

Explanation:

as sound travels through the air it creates a disturbance in the particles of the medium

First, we define density as:

Density = mass/volume;

We focus first on the volume of air in the room.

Volume:

We have the measurements of where the air is.

We calculate the volume with these measurements, but first, we change the units to L:

1 inch = 2.54 cm

1 L = 10^3 cm^3

1 ft = 12 inch

Now,

11.0 ft x (12 in/1 ft) x (2.54 cm/1 in) = 335.28 cm

12.0 ft = 365.76 cm

10.0 ft = 304.8 cm

Therefore, the volume of the room = 335.28 cm x 365.76 cm x 304.8 cm

Volume = 37378237.5 cm^3 x (1 L/10^3cm^3) = 374 x 10^2 L

From the Density equation, we clear the mass:

Density x volume = mass (g)

1.19 g/L x 374x10^2 L = 445x10^2 g x (1 kg/1000 g) = 44.5 kg

Answer: 44.5 kg

ANSWER Plasamas are good conductors of electricity and are affected bt magnetic fields

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Answer:

C

Explanation:

because it is product over reactants. hope this helps :)

The equilibrium expression for the reaction C(s) +\(O_{2}\)(g) ⇄ \(CO_{2}\) (g) will be

[\(CO_{2}\) ] / [ \(O_{2}\) ].

Chemical equilibrium is a state where no net change in the quantities of reactants as well as products takes place during a reversible chemical reaction.

The given reaction is C(s) +\(O_{2}\)(g) ⇄ \(CO_{2}\) (g) .

It is known that solid phase is not considered in equilibrium.

Hence, equilibrium expression = [\(CO_{2}\) ] / [ \(O_{2}\) ].

Therefore, the correct answer will be option (D).

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Answer:

1.204 × 10²³

Explanation:

The number of atoms in a mole is always 6.022 × 10²³, known as Avogadro's number or Avogadro's constant.

To convert moles to atoms, multiply the molar amount by Avogadro's number.

(6.022 × 10²³) × 0.2

         = 1.204 × 10²³

A given element's weight in grammes divided by its molar weight/atomic weight results in the number of moles of that element. The amount of moles for copper would therefore be 6.93/63.55, which equals 0.109.

6.02214076 x 1023 of the any chemical unit, such as atom, molecules, ions, and many others, constitute a mole. The mole is indeed a useful unit of measurement because there are many atoms, molecules, or other constituents in each substance.ny substance, the mole is a useful measure to utilise.

The mole is a unit of measurement used by scientists to determine how many elementary particles—typically atoms or molecules—there are in a given amount of a certain substance. Avogadro's number, which states that there are 6.022 1023 elementary entities in a mole, is an absolute number. It is also possible to write this as 6.022 1023mol-1.

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One 250ml beaker, a ph probe, 15ml of hcl, 15ml of Naoh, Various substances for pH measurement and 60ml of water are required to determine the ph of different substances.

To determine the pH of different substances, the following materials and steps are required:

Materials:

1. One 250ml beaker

2. pH probe or pH meter

3. 15ml of hydrochloric acid (HCl)

4. 15ml of sodium hydroxide (NaOH)

5. Various substances for pH measurement

6. 60ml of water

Procedure to measure the pH:

1. Start by filling the 250ml beaker with 60ml of water.

2. Immerse the pH probe or pH meter into the beaker, ensuring that it is properly calibrated according to the manufacturer's instructions.

3. Measure 15 ml of hydrochloric acid (HCl) using a graduated cylinder and add it to the beaker.

4. Measure 15 ml of sodium hydroxide (NaOH) using a graduated cylinder and add it to the beaker.

5. Stir the mixture gently to ensure proper mixing of the substances.

6. Take a sample of the substance whose pH needs to be determined and add it to the beaker.

7. Observe the pH reading on the pH probe or pH meter display.

8. Rinse the pH probe or pH meter with distilled water between measurements to avoid contamination.

9. Repeat the steps for each substance to obtain its respective pH value.

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The answer is (1) 3σ,1π,sp2. The hybridization of the N atom is therefore sp2, as it has three sp2 hybrid orbitals that form sigma bonds with the three atoms (C and two H's) and one unhybridized p orbital that forms a pi bond with the C atom.

To determine the number of bonds, we first need to draw the Lewis structure for H2CNH. The structure is H-C≡N-H, with the N atom in the center.

There are 3 sigma (σ) bonds in H2CNH - one between each H and the C, one between the C and the N, and one between the N and the H.

There is also 1 pi (Ï€) bond between the C and the N atoms, which is formed by the overlap of the 2p orbitals of the C and N atoms.

The hybridization of the N atom can be determined by looking at its geometry and bonding. The N atom has 3 sigma bonds and one lone pair of electrons. This suggests that it is in a trigonal planar geometry.

The hybridization of the N atom is therefore sp2, as it has three sp2 hybrid orbitals that form sigma bonds with the three atoms (C and two H's) and one unhybridized p orbital that forms a pi bond with the C atom.
The correct answer is (1) 3σ, 1π, sp2.

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The structure of (E)-3-phenyl-2-propenal can be represented as a molecule with a phenyl group attached to the second carbon atom of a propenal chain, where the double bond is in the E-configuration.

The EIZ stereochemistry of alkenes determines the placement of substituents on the double bond based on their relative position to one another. In this case, the phenyl group is on the opposite side of the double bond as the two methyl groups, giving it an E-configuration. The molecule's name provides some important information about its structure. The prefix (E) indicates that the double bond has an E-configuration, meaning the substituents on either side of the double bond are on opposite sides. The 3-phenyl indicates that the phenyl group is attached to the third carbon atom of the propenal chain, while the 2-propenal specifies that the chain has two carbon atoms and an aldehyde group. By using these naming conventions and understanding the EIZ stereochemistry of alkenes, we can accurately represent the structure of (E)-3-phenyl-2-propenal.

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As stated in the preceding statement Square pyramidal geometry describes the molecules.

An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.

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From the calculation, Suzanne is lying and she is guilty of killing her husband.

Stoichiometry provides a means of calculating the relationship between mass and mole or mole and volume in a reaction.

Now the preparation of ethylbenzene goes according to the reaction;

C6H6 + C2H6 ---->C6H5C2H5 + H2

Number of moles of benzene =  15 g/78 g/mol = 0.192 moles

Number of moles of ethyl benzene= 25 g/106 g/mol = 0.236 moles

Since the reaction is 1:1, 0.192 moles of ethyl benzene is produced.

Mass of 0.192 moles  of ethylbenzene =  0.192 moles * 106 g/mol = 20.4 g

Suzanne is lying.

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Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

Answer: A

Explanation: A