Help solve this please?

Answer:

compound

Explanation:

(it comes from a living animal and is not mixed with things)

Answer:

Dude! this is crazy but ill help

Explanation:

The answer is 76.4 milimeters

The molarity of the weak acid HA can be calculated from the volume and molarity of NaOH by which the number of moles of HA can be calculated. From the number of moles and a weight of 2.60 g, the obtained molar mass 159.50 g/mol

Molarity of of solution is the number of solutes per volume of solution in liters. In a titration, the product volume and molarity of the titrant is equal to the product of volume and molarity of the analyte.

The volume and molarity of NaOH is given 32.6 ml and 0.500 M. The molarity of 100 ml of weak acid HA is calculated as follows:

Molarity of HA = (32.6 ml × 0.500 M) /100 ml

                        = 0.163 M.

From the molarity the number of moles of HA can be calculated by multiplying molarity with volume in liter.

number of moles = molarity × volume

                             = 0.163 M  × 0.1 L.

                             = 0.0163 moles.

It is given that the weight of HA is 2.60 g. Thus molar mass can find out by dividing the weight by number of moles.

molar mass of HA = 2.60 g/ 0.0163 moles

                              = 159.50 g/mol.

Hence, the molar mass of the weak acid HA is 159.50 g/mol.

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Answer:thing chang into different thing

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:

there is two mixture homogeneous and heterogeneous mixture

ok

Answer:

0.159 M

Explanation:

convert from mL to L then use the equation:

M1V1 = M2V2

rearrange to find M2

[tex]\frac{M1V1}{V2} = M2[/tex]

[tex]\frac{(0.795 M)(0.100 L)}{0.500 L} = 0.159 M[/tex]

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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Explanation:

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

Answer:

Physical, Inorganic, Biochemistry, Analytical, and Organic

Physical chemistry deals with applying physics to the study of matter. It's also probably the most important branch. Inorganic chemistry deals with stuff that is chemically composed of elements other than carbon. The branch of Biochemistry concerns itself with living things. Analytical chemistry deals with analyzing and finding out what substances are present in a particular material and how much of each substance is present. Finally, organic chemistry deals with substances that are compounds of carbon.

Explanation:

Answer:

Non-redox, double displacement

Explanation:

it's the only answer that have double displacement

tell me if it was right

Answer:

SPECIFIC HEAT  is the amount of heat needed to raise the temperature by one degree

1 gram of substance. Each substance has its own specific heat and if the physical state changes (e.g. liquid, solid, gas)

the specific heat also changes . Units are expressed in Joules per gram per degree Celsius (J / g ° C). Sometimes

the J / kg K unit is also used. The latter unit is technically the most correct unit to use, but since  

since the former is quite common, it is necessary to know both. The specific heat of H2O depending on

phase is indicated in the table.

Explanation:

Hope it helps.

The classification for the following half-reactions is:

An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing electrons.

There are 2 kinds of half-reactions.

Let's classify the following half-reactions.

Electrons are not exchanged and Cl, the element present on both sides, has the same oxidation number, -1. This is neither oxidation nor reduction.

Mg loses 2 electrons and its oxidation number increases from 0 to +2. This is an oxidation half-reaction.

H gains 2 electrons and its oxidation number decreases from +1 to 0. This is a reduction half-reaction.

The classification for the following half-reactions is:

The question is incomplete. I believe the complete question is as follows.

Use this oxidation-reduction reaction to answer questions about half-reactions:

Mg + 2 HCl → MgCl₂ + H₂

Classify these half-reactions by typing in "O" for "oxidation half-reaction," "R" for "reduction half-reaction," and "N" for "neither."

HCI → MgCl₂

Mg → MgCl₂ + 2 e⁻

2 HCI + 2 e⁻ → H₂

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Answer:

For those who need it, the answers are N, O, R

Explanation:

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:

o

Explanation:

ucbsnwjxjzbsjxbjzbsnsjxbsbbsnxbbxbsnzjjsjzkzkkzkzkz

shshdbsussbbzishxbsbbxusbxhzjjxchinga subs sh is znsoa d bea s for the last time you know. tumamamsr rnnfnt I. NJ just bought new house but he got very very very big but just very kind just bought him just now just now but he has his house but he has his house in his house haha hriirnr is Enfield in his head ️ BF do feel free for me quebro Ayer dry do it for you to do feel like fun for ️ do feel like fun fun fun fun for the last time fun for the last time for free from my gf for free from the other side for from a fe has his house haha he has been busy hereditary so we are going through it and don't feel free can go jump yes very big lol that good in my head that ft in a good game from good get good good GG from a great gAA

Answer:

Explanation:

Which of the following best describes weather? day to day conditions of the atmosphere at a place in regards to heat, dryness, sunshine, wind, rain, etc. long-term conditions (30 or more years) of the atmosphere at a place in regards to heat, dryness, sunshine, wind, rain, etc.

Answer:

Weather is short term climate is long term.

Explanation:

Answer:

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

The Temperature of given nitrogen sample will be 401.3 K and can be calculated by formula of root mean square velocity.

Firstly we will determine the mass of a nitrogen molecule in kilograms:

Replace the variables and the  constants in  root-mean-square velocity equation, replacing Joules with  equivalent kg m2s–2:

The formula for root mean square velocity is given by,

μrms= √3RT/m

where,

μrms is  the root mean square velocity

R is the gas constant

T is  the temperature

m= mass of nitrogen atom

μrms= √3× 8.314×T/ 0.028

597.0/T= √3× 8.314/ 0.028

T= 597.0/ √3× 8.314/0.028

√T= 597.0/ 29.8

T= 401 .3 K

The temperature of sample of nitrogen is 401.3 K.

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Answer:

Explanation:

lead 3 is correct!!!!!

The correct option s D.

Because from the reaction of hydrogen and nitrogen to form ammonia, Hydrogen is oxidized, nitrogen is reduced.

Therefore, Nitrogen gas is the oxidizing agent and hydrogen gas is the reducing agent.

This is called a redox reaction

Redox reaction is a chemical reaction in which electrons can move from one atom to another leading to change of oxidation states.

In this reaction nitrogen gas act as an oxidizing agent and hydrogen gas actsas a reducing agent.

N2+3H2 = 2NH3

(g). (g)

From the reaction, oxidation number of nitrogen is 0 on the reactants' side to

3.

The decrease in the oxidation number of nitrogen indicate that it is being reduced.

On the other hand, the oxidation number of hydrogen move from on the reactants' side to +1 on the products' side. This increase in the oxidation number of hydrogen indicate that hydrogen is oxidized.

Therefore, nitrogen gas is reduced to ammonia and hydrogen gas is oxidized to ammonia

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A kaleidoscope is an optical instrument with two or more reflecting surfaces (or mirrors) tilted to each other at an angle, so that one or more (parts of) objects on one end of the mirrors are seen as a regular symmetrical pattern when viewed from the other end, due to repeated reflection.

Hope it helps.

Do comment if you have any query.

Answer:

c

Explanation:

Answer:

I think the first one

Explanation:

I think because it is going from 600 to 400 it is decreasing

Answer:

Na:[He]3s¹

Explanation:

[He] => core structure => Helium ([He]1s²)

3 => principle energy level of valence electrons

s => orbital geometry of valence structure => spherical

s¹ => orbital orientation of valence structure => 1 orientation for sphere

superscript 1 => 1 unpaired electron in orbital

Answer:

116.1 g

Explanation:

Answer:

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

In this case, according to the described chemical reaction, which takes place between carbon monoxide and hydrogen to produce methanol at 260 °C and 40 atm:

[tex]CO(g)+2H_2(g)\rightleftharpoons CH_3OH(g)[/tex]

It is possible to calculate the pressure-based equilibrium constant via:

[tex]Kp=exp(-\frac{\Delta G\°}{RT} )[/tex]

Whereas the change in the Gibbs free energy for the reaction is calculated with the following, assuming these changes can be assumed constant for the temperature range (25°C to 260°C):

[tex]\Delta G\°=\Delta H\°-T\Delta S\°[/tex]

Whereas the change in both enthalpy and entropy are based on enthalpies of formation and standard entropies of both carbon monoxide and methanol respectively (exclude hydrogen as it is a single molecule of the same atom):

[tex]\Delta H\°=-166.3-(-137.3)=-29kJ/mol\\\\\Delta S\°=0.1268-0.1979=-0.0711 kJ/mol-K[/tex]

Thus:

[tex]\Delta G\°=-29\frac{kJ}{mol} -(260+273.15)K*(-0.0711\frac{kJ}{mol*K} )=-66.91 kJ/mol[/tex]

Hence, the pressure-based equilibrium constant will be:

[tex]Kp=exp(-\frac{-66,091\frac{J}{mol}}{8.314\frac{J}{mol*K} *(260+273.15)K} )=3.592x10^6[/tex]

Next, we calculate the concentration-based equilibrium constant:

[tex]Kc=\frac{Kp}{RT^{\Delta \nu}} =\frac{3.592x10^6}{((8.314\frac{J}{mol*K})(260+273.15)K)^{(1-2-1)}}= 7.058x10^{13}[/tex]

After that, we calculate the volume for us to get concentrations for the involved species at equilibrium:

[tex]V=\frac{(200+350)mol*0.08206\frac{atm*L}{mol*K}(260+273.15)K}{40atm} =601.6L[/tex]

[tex][CO]_0=\frac{200mol}{601.6L}=0.332M[/tex]

[tex][H_2]_0=\frac{350mol}{601.6L}=0.582M[/tex]

Then, the equilibrium expression and solution according to the ICE chart:

[tex]7.058x10^{13}=\frac{x}{(0.332-x)(0.582-2x)^2}[/tex]

Whose physically-consistent solution would be x = 0.29 M, it means that the equilibrium conversions are:

[tex]X_{CO}=\frac{0.29M}{0.332M}=0.873(87.3\%) \\\\X_{H_2}=\frac{0.29M*2}{0.582m}=0.997(99.7\%)[/tex]

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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

A brown solid is formed in the reaction tube and the lime water turns cloudy. The compound Y is calcium hydroxide. Therefore, A is correct.

The common name for a saturated aqueous calcium hydroxide solution is lime water. At room temperature, calcium oxide (Ca(OH)2) is only weakly soluble in water.

Saturated calcium hydroxide solution is sometimes known as lime water or milk of lime. Ca(OH)2 is its chemical formula. Instead of the fruit sense of lime, the name is based on the mineral sense of lime. Lime wash is the name given to lime water used as paint.

Slaked lime, often known as calcium hydroxide, is an inorganic substance having the chemical formula Ca(OH)2. When water is combined with quicklime (calcium oxide), a colorless crystal or white powder is created.

Thus, option A is correct.

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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.