A solution of HF is titraited with a 0.150M NaOH solution. The pH at the half equivalence point is ? The Ka of HF I 0.00068.

Answer:

wavelength is 0.77 m

Explanation:

wavelength is y is equal to FB is equal to 44 0340

The names of the substances for the reactants in the chemical equation 2H₂ + O₂ → 2H₂O are; Hydrogen gas (H₂) and Oxygen gas (O₂). Option A and C is correct.

Hydrogen gas (H₂) - This is the molecular form of hydrogen, consisting of two hydrogen atoms bonded together.

Oxygen gas (O₂) - This is the molecular form of oxygen, consisting of two oxygen atoms bonded together.

In a chemical equation, the reactants are the substances that undergo a chemical reaction to form new products. In this case, the reactants are hydrogen gas (H₂) and oxygen gas (O₂). The arrow (→) in the equation represents the direction of the reaction, indicating that hydrogen gas and oxygen gas react to form water (H₂O).

The coefficient 2 in front of H₂ and H₂O indicates that two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water. The balanced chemical equation shows the stoichiometry of the reaction, indicating the number of molecules of each reactant and product involved in the reaction.

Hence, A. C. is the correct option.

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--The given question is incomplete, the complete question is

"Choose the names of the substances for reactants of the equation

2H₂ + O₂ → 2H₂O Options; A) Hydrogen B) Water C) Oxygen."--

Answer:Cl2

Explanation:each gas is 1 gm and has the same P andT. The gas with the highest molar mass will have the lowest volume with least moles. Cl2 wins the prize

Answer:

I want to say (A) but i also want to say (C) but i can be wrong. most likely (C)

Explanation:

hope this helps lol and have a great day

Answer:

honestly this is kind of an opinionanated question because some people think that the vaccine dosen't work. Like I think that, but some other people might think differently so im gonna go with answer c.

Explanation:

Answer:

Explanation:

1 Electrolytes, particularly sodium, help maintain fluid balance through osmosis. Osmosis is a process where water moves through the wall of a cell membrane from a dilute solution (more water and fewer electrolytes) toward a more concentrated solution (less water and more electrolytes).

2 acid base balance in the body

our body's pH balance, also referred to as its acid-base balance, is the level of acids and bases in your blood at which your body functions best. The human body is built to naturally maintain a healthy balance of acidity and alkalinity. The lungs and kidneys play a key role in this process.

Answer:

116.1 g

Explanation:

Answer:

Answer is 0. 508grams I'm not sure if I'm right but it might be the answer.

The heat of vaporization of CH3CN is obtained from the question as 25 KJ/mol.

We can obtain the number of moles from;

PV = nRT

P = 1 atm

V = 1.17 L

n = ?

R = 0.082 atm LK-1mol-1

T = 81.6 °C + 273 = 354.6 K

n = PV/RT

Substituting values;

n =  1 atm × 1.17 L/0.082 atm LK-1mol-1 × 354.6 K

n = 0.04 moles

Using; q = n·ΔHv

q = Heat absorbed

n = number of moles

Hv  = Heat of vaporization

ΔHv = q/n

ΔHv = 1.00 × 10^3/0.04

ΔHv = 25 KJ/mol

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Answer:

YES

Explanation:

SO3 2-DOES  show delocalized bonding

delocalized bonding occurs when there is a resonance structure and the electronic bonds are a delocalised "cloud" around the species

The resonance effect of the sulfite sructures ithe folowing link:

https://www.chemistryscl.com/general/lewis-resonance-structure-of-SO32-/index.php

Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore SO₃²⁻ show delocalized bonding.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

SO₃²⁻ show delocalized bonding as there is a resonance structure and the electronic bonds are a delocalized "cloud" around the species

Therefore SO₃²⁻ show delocalized bonding.

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B. dust particles are absorbing light

When light travels through a medium, it interacts with the medium and this causes the scattering of light. - Photons are absorbed by molecules in the medium, and this causes the molecules to vibrate and then re-emit the photons. ... - The scattering of light increases with frequency

Answer:

C

Explanation:

the answer is C. dust particels are reflecting light. hope this helps

Answer:

the answer is 319 mph

Explanation:

you do 239/.75 (45 minutes will get you a different answer)

Answer:

To shield the organs and glands from the enzymes' digestion, protein digesting enzymes are released in an inactive state. If they are discharged in an active state, they begin digesting the glands that transport them as well as the release site.

Explanation:

Answer:

At the end, no light passes through.

Explanation:

First, when white light enters a blue filter, only blue light is allowed to pass through, and all the other components of light are absorbed. When blue light then reaches the yellow filter, it absorbs the blue light, because it is designed to allow only the yellow component of the light to pass through. White light consists of the seven rainbow colours: red, orange, yellow, green, blue, indigo and violet.

Answer:

The spectroscope scale is illuminated so that one can know exactly where the wavelengths of the lines are falling along.

Explanation:

The crystal size of an igneous rock is described as it's texture

Answer:

1G

Explanation:

Answer:

Covalent bond

Explanation:

All the characteristics of a Covalent bond are being described.

When, a substance boils at 45degree C. Then, the most likely bond type for the given substance is a covalent bond. Option A is correct.

Liquid at Room Temperature: The fact that the substance is a liquid at room temperature suggests that the intermolecular forces holding its molecules together are relatively weak. Covalent compounds often have weaker intermolecular forces compared to ionic or metallic compounds.

Doesn't Conduct Electricity When Dissolved in Water: Covalent compounds, in general, do not conduct electricity when dissolved in water. This is because they do not dissociate into ions in solution, which is necessary for electrical conductivity. Ionic compounds, on the other hand, typically dissociate into ions and can conduct electricity in solution.

Boils at 45°C: The relatively low boiling point (45°C) indicates that the intermolecular forces in the substance are weak. Covalent compounds tend to have lower boiling points compared to ionic or metallic compounds, which often have stronger bonding.

Considering these factors, the substance is likely held together by covalent bonds, which involve the sharing of electrons between atoms. This allows for the formation of discrete molecules with weak forces between them.

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"The substance is a liquid at room temperature.-When you dissolve it into water, it doesn't conduct electricity.-The substance boils at 45 oC. Which is the most likely bond type for this substance? Choices: A) Covalent bond B) Metallic bond C) Ionic bond D) Hydrogen bonding E) Cation-pi bond."--

Answer:

in order to reduce and simplify the study of the animals

to be able to group animals in their appropriate groups

Explanation:

when we classify organisms that means that we take a large number of organisms and group them to a single and correct group that will help the scientists across the world to identify organisms easily

Answer:

4.2 atm

Explanation:

Dalton’s Law of Partial Pressures

PA = XA(PT)

Partial pressure of A = mole factor of gas A x total pressure of all gases

PA = 0.21 atm

XA = 0.050

PT= ?

0.21atm= 0.050(PT)

0.21/0.050 = PT

PT = 4.2 atm

The total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.

The partial pressure of a gas can be calculated using Dalton's law of partial pressure equation as follows:

PA = XA(PT)

Where;

Based on the information given in this question;

0.21 atm = 0.050 (PT)

0.21/0.050 = PT

PT = 4.2 atm

Therefore, the total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.

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Answer:

Batteries get its power from the stored energy inside it- chemical energy- which is then converted into electrical energy. The flow of the electrons allow the electric current to do work.

Explanation:

Answer:

there is two mixture homogeneous and heterogeneous mixture

ok

Answer:

Non-redox, double displacement

Explanation:

it's the only answer that have double displacement

tell me if it was right

Answer:

well it depends of the distance, but u get your frequency and u times it by a round number if im correct

Explanation:

Answer:

Explanation:

lead 3 is correct!!!!!

Answer: Volume. Litre (L) and millilitre (mL) are non-SI units, but because they are easier to write and pronounce, they are in common use.

Explanation: I think the explanation is the answer also

Answer:

I don't know what you're saying cuz give me the brainless answer please