Which beat describes heat

Answers

Answer 1

Answer:

Answer:

I assume you mean which best describes heat.

The answer is The energy transferred between samples of matter because of a difference in their temperatures.

To explain this further, heat is total energy of an object, temperature is average energy. The change in temperature between two objects is called heat!

Think about transfers of heat in everyday terms: if you put an ice cube in your tea (I don't know, just bear with me), the cold does not transfer to the tea. The heat of the tea is transferred to the ice cube! And this is clearly a difference in heat.

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Use the following structures of amino acids to answer the questions below. Note that the difference in the structures (the side chains) is highlighted by gray shading.A student performed chromatography of the four amino acids and theresults were shown in the chromatogram below. If an anion exchangecolumn (column is positively charged) was used in a neutral buffer,assign each amino acid to the corresponding peak in the chromatogram.
A new process converts potential energy of an object to kinetic energy. Neither work nor eat is added to the system. No reaction takes place. What determines the velocity of the Anew bject? Not sure All of the above Elevation of the process Change in height of the object Mass of the object
What is the symbol of the element that is classified as an alkali metal and is in period 4?
Systematic name for: Silver Nitrate.molar mass of Ag:molar mass of N:molar mass of O:and the overall molar mass for Silver Nitrate.
What is the percent composition of nitrogen in sodium nitride

What does dry ashing mean

Answers

Dry ashing refers to the use of a muffle furnace capable of maintaining temperatures of 500–600°C. Water and volatiles are vaporized, and organic substances are burned in the presence of oxygen in air to CO 2 and oxides of N 2. Most minerals are converted to oxides, sulfates, phosphates, chlorides, and silicates. Hope this helped!

Many calculators use photocells to provide their energy. Find the maximum wavelength needed to remove an electron from silver (Φ = 7.59 x 10⁻¹⁹ J). Is silver a good choice for a photocell that uses visible light?

Answers

Answer:

$\lambda=2.61* 10^(-9)\ m$ = 261 nm

Silver is not a good choice.

Explanation:

$E=\frac {h* c}{\lambda}$

Where,

h is Plank's constant having value $6.626* 10^(-34)\ Js$

c is the speed of light having value $3* 10^8\ m/s$

$\lambda$ is the wavelength of the light

Given that:- Energy = $7.59* 10^(-19)\ J$

$7.59* 10^(-19)=(6.626* 10^(-34)* 3* 10^8)/(\lambda)$

$7.59* \:10^(26)* \lambda=1.99* 10^(20)$

$\lambda=2.61* 10^(-9)\ m$ = 261 nm

Visible range has a spectrum of 380 to 740 nm

So, Silver is not a good choice.

Final answer:

The maximum wavelength needed to remove an electron from silver is approximately 262 nm. Silver is not a good choice for a photocell that uses visible light.

Explanation:

To find the maximum wavelength needed to remove an electron from silver, we can use the work function of silver, which is Φ = 4.73 eV. The threshold wavelength for observing the photoelectric effect in silver can be calculated using Equation 6.16, which is λ = hc/Φ. Substituting the given values, we have λ = (1240 eV⋅nm) / (4.73 eV), which gives us a threshold wavelength of approximately 262 nm. Since visible light ranges from 400 to 700 nm, silver is not a good choice for a photocell that uses visible light.

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What are the conjugate base and conjugate acid for HSO4−? What is the term used to describe species that can behave as either an acid or a base, depending on the chemical environment?

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The conjugate acid $H^+$ and base $SO4^2-$ and the term would be Amphoteric.

Conjugate acid-

What is Amphoteric?

Amphoteric is described as the term employed to denote a substance that possesses the characteristics of both an acid, as well as, a base.

Given equilibrium:

$HSO4^-(aq)$ → $H^+(aq) + SO4^2-(aq)$

Therefore, the dissolution of $HSO4^-$ in water leads to the display acid that is conjugate $H^+$ and the conugate base $SO4^2-$ .

In case, the properties of both are reflected, it shows amphoteric nature.

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Answer:

Conjugate acid- H^+

Conjugate base- SO4^2-

Terminology- Amphoteric

Explanation:

Consider the equilibrum shown below;

HSO4^-(aq)<-------> H^+(aq) + SO4^2-(aq)

Hence, When HSO4^- is dissolved in aqueous solution, it's conjugate acid is H^+ and it's conjugate base is SO4^2- as shown in the equation above.

If a substance behaves both as an acid and as a base, then the substance is Amphoteric in nature.

The leaves of the rhubarb plant contain high concentrations of diprotic oxalic acid (hooccooh) and must be removed before the stems are used to make rhubarb pie. if pka1 = 1.23 and pka2 = 4.19, what is the ph of a 0.0269 m solution of oxalic acid?

Answers

Chemical reaction (dissociation) 1: C₂O₄H₂(aq) ⇄ C₂O₄H⁻(aq) + H⁺(aq).
Chemical reaction (dissociation) 2: C₂O₄H⁻(aq) ⇄ C₂O₄²⁻(aq) + H⁺(aq).
c(C₂O₄H⁻) = c(H⁺) = x.
c(C₂O₄H₂) = 0.0269 M.
pKa₁ = 1.23.
Ka₁ = 10∧(-1.23) = 0.059.
Ka₁ = c(C₂O₄H⁻) · c(H⁺) / c(C₂O₄H₂).
0.059 = x² / (0.0269 M - x).
Solve quadratic eqaution: x = c(H⁺) = 0.02 M.
pH = -log(0.02 M) = 1.7.

A disaccharide forms when: two monosaccharides join by dehydration synthesis. two starches join by hydrolysis. two starches join by dehydration synthesis. a starch and a monosaccharide join by dehydration synthesis. two monosaccharides join by hydrolysis.

Answers

Answer:

two monosaccharides join by dehydration synthesis

Explanation:

A disaccharide is formed when two monomers join together by a loss of water molecule.

Final answer:

A disaccharide is formulated when two monosaccharides join through dehydration synthesis. A water molecule is dropped, and a glycosidic bond is formed between the two sugar elements. Sucrose, lactose, and maltose are crucial disaccharides for humans.

Explanation:

A disaccharide forms when two monosaccharides join by dehydration synthesis. This reaction involves a hydroxyl group (-OH) of one monosaccharide combining with a hydrogen atom of another monosaccharide. As a result, a molecule of water (H₂O) is released, and a covalent bond, specifically known as a glycosidic bond, forms between the two sugar molecules. Disaccharides critical for humans include sucrose (table sugar), lactose (milk sugar), and maltose (malt sugar). However, the human body cannot directly use these. They must first be split into their constituent monosaccharides via a separate process known as hydrolysis in the digestive tract.

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Group 17 elements form A. +1 ion B. -1 ion C. +7 ion D. -7 ion

Answers

Answer:

Explanation:

Use your periodic table to find out the charge on a Fl ion if your periodic table is constructed that way. In any event, the charge on Fl when it becomes an ion is -1. I don't think it has any other charge. So all of the elements in column 17 will have at least -1 in common.

Final answer:

Group 17 elements, also known as halogens, have seven valence electrons and tend to gain one electron to become stable, forming a -1 ion.

Explanation:

The elements in Group 17 on the periodic table are also known as halogens. These elements, which include fluorine, chlorine, bromine, iodine, and astatine, have seven valence electrons. Hence, they tend to gain one electron to achieve a stable electron configuration, forming a -1 ion. Therefore, the correct answer to your question is B. -1 ion.

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wo reactions and their equilibrium constants are given. A + 2 B − ⇀ ↽ − 2 C K 1 = 2.57 2 C − ⇀ ↽ − D K 2 = 0.226 A+2B↽−−⇀2CK1=2.572C↽−−⇀DK2=0.226 Calculate the value of the equilibrium constant for the reaction D − ⇀ ↽ − A + 2 B .