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What best describe the enthalpy of formation is that it is the energy change that happens when a substance forms from its elements

Option b

This goes to say that it is the heat change which occurred when one mole of substance is formed from its constituent elements.

Enthalpy can be defined as the sum total of the internal energy and the product of the pressure and volume of a system

So therefore, the entalphy of formation is

the energy change that happens when a substance forms from its

elements

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Answer:

The answer is B, The energy change that happens when a substance forms from its elements

Explanation:

Answer: i don't know

Explanation:

1. Kidney receive the waste product carried by the blood.

2. Homeostasis is the ability to maintain a relatively stable internal state that persist despite changes in the world outside.

3. The respiratory system and circulatory system work together by exchanging of oxygen and carbon dioxide.

4. Oxygen is a gas that the body needs.

5. Chemical signals are carried out by circulatory system that control the speed of digestion.

6. Oxyhemoglobin is a combination of hemoglobin and oxygen that enters in the body.

7. The respiratory system and digestive system work as it absorbed oxygen that being distributed through the body.

8. The respiratory system is responsible for exchange of gases.

9. The circulatory system carries nutrients to the entire body cells.

10. The digestive system is responsible for food digestion.

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Geometry for the complex ion [Co(en)(H2O)4]2+ that are possible is : Octahedral.

A compound with six atoms or groups of atoms or ligands grouped symmetrically around a central atom and defining the vertices of the octahedron represents the shape of an octahedron in chemistry and is known as an octahedral molecular geometry (also known as a square bipyramid).

The prefix is octa because the octahedron has eight faces. Octahedral bond angle values between 90° and 180° are what determine the octahedral shape. The angles between each of the four atoms that make up the square bases of the two pyramids of the octahedral structure and one of the apex atoms are both 90 degrees.

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The molarity when .772 moles are dissolved in .500 Liters of water is 0.0015M. The molarity when .453 moles are dissolved in .450 Liters of water is 0.001M.

The term molarity is defined as the number of moles of solute dissolved in per litre of solution. The unit of molarity is mole, which is denoted by the symbol "M".

M = Number of moles of solute / litre in solution

1. Number of moles of solute = .772 moles

so, 0.772 / 500

= 0.0015 M

2. Number of moles of solute =  .453 moles

so, .453 / 450

= 0.001 M

Thus, The molarity when .772 moles are dissolved in .500 Liters of water is 0.0015M. The molarity when .453 moles are dissolved in .450 Liters of water is 0.001M.

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xenon fluorides are known to undergo hydrolysis to give the hydrohalic acid and the rare gas oxide similar to the following equation: XeF6 + 3H2O -> XeO3 + 6HF.

A noble gas compound with the formula XeF6 is xenon hexafluoride. It is one of xenon's three binary fluorides, along with XeF2 and XeF4. All known are exergonic and stable at normal temperatures. The series' strongest fluorinating agent is XeF6.Water's chemical formula is H2O, which means that each of its molecules consists of two hydrogen atoms and one oxygen atom. In its +6 oxidation state, xenon can form the unstable chemical xenon trioxide(XeO3). It is an extremely potent oxidizing agent that slowly releases oxygen from water, a process that is sped up by sunshine. When it comes into touch with organic materials, it explodes dangerously. It emits xenon and oxygen gas when it explodes.

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The mass of 2.30 x 10²⁴ particles of water (H₂O) is 60.84 grams.

The amount of matter in a particle or object is represented by its mass, which is denoted by the symbol m. In the International System (SI), the kilograms serves as the default unit of mass (kg).

The formula N = n L describes the relationship between a substance's number of particles and number of moles.

n also defined using the equation n = m/M

N = n L

N = m/M L

Then substitute N and L values,

2.30×10²⁴ = m/M × 6.02×10²³

Molar mass of water = 18

2.30×10²⁴ = m/18  × 6.02×10²³

2.30×10²⁴/6.02×10²³ = m/18

3.38 = m/18

m = 3.38 × 18

m = 60.84grams.

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Protons, neutrons and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.

The total of an element's protons plus neutrons is that element's mass number. One atomic mass unit, or amu, roughly equals the weight of neutrons and protons. While atomic number equal to proton and electron.

The proton can be calculate as follows:

C−14 has atomic no = 6 and mass no = 14.

so

No of electrons = No of protons = atomic no = 6

No of neutron = mass no-atomic no = 14−6=8

Therefore,  Protons, neutrons, and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.

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The percentage composition of carbon is 19.37% and percentage of oxygen is 49.68% and percentage composition of hydrogen is 12.8%.

According to question,

6.20g of carbon, 4.10g of hydrogen and 15.90g of oxygen is present in total sample of methanol.

Total mass of methanol is=mass of carbon x 1+ mass of oxygen x 1+mass of hydrogen x 4

Total mass= 12x1+16x1+1x4

Total mass=32g

Now, to find the percentage composition of each element use the total mass and given mass of element.

The ratio of the amounts of each element to the sum of the individual element amounts present in the compound, multiplied by 100, is the definition of the percentage composition of a given compound. In this instance, the quantity is expressed in gram of the constituent ingredients.

Percentage composition[tex]=\frac{mass of an element}{total mass}*100[/tex]

Percentage composition of carbon=[tex]\frac{6.20}{32} *100[/tex]

On solving we get,

Percentage composition of carbon=19.37%

Percentage composition of oxygen=[tex]\frac{15.90}{32}*100[/tex]

On solving we get,

Percentage composition of oxygen=49.68%

Percentage composition of hydrogen=[tex]\frac{4.10}{32}*100[/tex]

On solving we get,

Percentage composition of hydrogen=12.8%

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Answer:

Soluble

Salt is soulble is water

Explanation:

Solubility although similar just means how easily it will disolve somthing that isnt soluble in one thing still has solubility

In chemistry, a sigma bond (σ bond) is a chemical bond formed by the overlap of two atomic orbitals. On the other hand, a pi bond (π bond) is a chemical bond formed by the overlap of two p orbitals.

Sigma bonds are the strongest type of covalent bond, with a bond strength of about 280-350 kJ/mol. They are also the shortest bond, with an average length of about 0.15 nanometers (nm).

Sigma bonds are characterized by their short bond length and high bond energy. They are also directional, meaning that they are stronger in certain orientations than in others.

Pi bonds are weaker than sigma bonds, with a bond strength of about 70-100 kJ/mol. They are also longer than sigma bonds, with an average length of about 0.2nm.

Pi bonds are characterized by their longer bond length and lower bond energy compared to sigma bonds. They are also less directional than sigma bonds, meaning that they are relatively equally strong in all orientations.

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Covalent bonds has two types which are a sigma bond is a chemical bond formed by the overlap of two atomic orbitals and a pi bond (π bond) is a chemical bond formed by the overlap of two p orbitals.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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There are two isotopes of bromine atom⁷⁹Br, ⁸¹Br.

a) Each peak originates from a different isotope of bromine. Each peak is composed of a different isotope of bromine. The mass of each isotope is the sum of the masses of the two atoms in the molecule. The average molecular weight of Br_ molecules is 36.184 g/mol.

b) The isotope of bromine has an atomic weight of 78.92 amu and a relative abundance of 50.69. The other major isotope of bromine has an atomic mass of 80.92 amu and a relative abundance of 49.31.

c) The average molecular mass of a [tex]Br_{2}[/tex] = 159.8066274.

d) The average atomic mass of Bromine is found to be. 9 u or 79.9 g mol⁻¹.

e) Bromine has two stable isotopes, ⁷⁹Br and ⁸¹Br, having relative mass abundances of 50.686% and 49.314%

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Answer: condensation

Explanation: This is because a condensation reaction involves the loss of one or more water molecule

A terminology which can be used to describe the above chemical reactions is condensation.

Condensation can be defined as a type of chemical reaction in which the combining chemical elements or compounds (reactants) losses one or more water molecule.

Based on the reaction shown above, we can deduce that the reacting chemical compounds (reactants) lost one water molecule.

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Answer:

Think sorry if i did it wrong The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He. 1 g of He = (6.022 X 1023) / 4 atoms of He. 52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.

For Helium,

Number of atoms=Number of moles ×6.022×1023

No of Moles = 6.022×10

2312.044×10

23 = 2.

Now, atomic mass of He=4

Weight = 2×4 = 8 g

The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He. 1 g of He = (6.022 X 1023) / 4 atoms of He. 52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.

As we know, gram atoms = gram mole

here, no of moles = 23/46 =2 so no of gram atoms are 2.

Explanation:

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Answer:

I think it's B

Explanation:

B is talking about the bees helping the flowers, so that isn't helping the bees but the flowers instead

According to the given chemical equation and stoichiometry of it , 36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

As per the reaction, 1 mole of P₄O₁₀ produces 4 moles of  H₃PO₄, thus 9 moles of  P₄O₁₀ will produce 9×4=36 moles of H₃PO₄.

Thus,36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.

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Answer:36

Explanation:

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Answer:

100 kPa

Explanation:

This can be solved with one of the gases law. This law establishes that the pressure of the gas is directly proportional to its temperature: If we increase the temperature, the pressure will increase.

In this case, we decrease the temperature, so its pressure will be lower.

P₁ / T₁ = P₂ / T₂

We convert T° to Absolutes Values

27°C + 273 = 300 K

-173°C + 273 = 100 K

300 kPa / 300 K = P₂ / 100 K

(300 kPa / 300 K) . 100K = P₂

P₂ = 100 kPa

This is the Charles Gay Lussac's law.

Answer:

d. Decreasing volume

step by step explanation:

Answer:

umm i guess if there is a liquid inside it would rise to the top and the metal would sink to the bottom

(C) moved faster and spread farther apart

An increase in temperature indicates the molecules in the liquid move faster and spread farther apart. The mercury thermometer was named after physicist Daniel Gabriel Fahrenheit in Amsterdam. Mercury thermometers are useful in many ways such as measuring body, liquid, and vapor temperature. The movement of the liquid in a thermometer shows changes in temperature. With an increase in temperature shows the molecules in the liquid are moving faster and the temperature is rising in the thermometer. The mercury expands to indicate a higher temperature up the tube which is marked in order to recognize a measurement of temperature. Mercury thermometers are rare today as most of them are toxic nowadays. A Mercury thermometer consists of a bulb containing mercury attached to a glass tube; the volume of mercury in the tube is much less than the volume in the bulb.

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The reactivity of an element depends upon the number of valence electrons, i.e., the electrons present in the outermost shell.

The number of electrons withinside the outermost shell of an atom determines its reactivity. Noble gases have low reactivity due to the fact they've complete electron shells. Halogens are extraordinarily reactive due to the fact they with ease advantage an electron to fill their outermost shell. Non-reactive metal atoms have whole outer shells and therefore do now no longer generally tend to lose, advantage, or percentage electrons. So, all factors having a crammed outermost shell are non-reactive. They also are referred to as noble gases. An element's reactivity is decided via way of means of the number of protons determined in an atom of the element.

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A blend of dyes called a universal indicator gradually changes color throughout a pH range of 4 to 14. The color serves as a direct indicator of pH.

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symbol

aluminium - Al 4

oxygen- o 12

hydrogen- H 12

Your limiting reagent will be copper (II) chloride. The mole ratio is the most crucial tool you'll have to tackle this problem, or any other stoichiometry problem, for that matter.

Keep in mind that in order to make 3 moles of copper from 3 moles of copper (II) chloride, you need 2 moles of aluminum. Unbalanced reaction: Al(s)+HCl(aq) AlCl3(aq)+H2(g). Cl. Balance On the product side there are three Cl atoms and on the reactant side there is one. There is only one hydrogen atom on the reactant side and two on the product side of the reaction Mg + HCl MgCl 2 + H 2. The equation is therefore unbalanced.

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Neutral carbon-14 contains six electrons, six protons, eight neutrons.

- The smallest particle that may exist, an atom, is what creates the entire cosmos. It has a core nucleus that houses the neutral species known as neutrons and positively charged species known as protons.

The orbit of the nucleus is being circled by negatively charged species of electrons. The atomic number of an atom is determined by its protons, and the number of protons is always equal to the number of electrons.

The carbon-14 in this instance is an isotope of carbon-12 with a mass number of 14. Atomic number six carbon has a total of six protons and six electrons.

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Because of its simplicity, comparatively low cost, great sensitivity, and rapid separation, TLC is an extensively used analytical method.

Using a thin stationary phase supported by an inert backing, thin layer chromatography (TLC) is a chromatographic technique used to separate the components of a mixture. It can be carried out on an analytical scale to track the development of a reaction or on a preparative scale to purify minute quantities of a chemical. Similar to all chromatography, TLC works on the premise that a chemical will have varying affinities for the mobile and stationary phases, which will influence how quickly it migrates. TLC aims to produce well-defined, well-separated spots.

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