hi!! please help :( lots of points !

A substance that is not in its standard state is option(b) i.e, H.

The standard state of a substance occurring at the specified temperature and one atmosphere of pressure is the typical condition of a substance occurring in a condensed phase.

Eleven elements are gases in their standard state. Including all noble gases and the halogens fluorine and chlorine (He, Ne, Ar, Kr, Xe, Rn). Hydrogen (H), oxygen, and nitrogen make up the remaining three. All other elements are solid in their native state.

The concept of standard state conditions stipulates that liquids and gases must be pure, solutions must be at 1 M concentration, and 1 atm of pressure is used in STP calculations involving gases that resemble ideal gases. Although the temperature is not stated, most tables gather information at 25 degrees C. (298 K).

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percent yield of Cu (OH)2 is 85%

CuSO4 + 2 NaOH >>> Cu (OH)2 + Na2SO4

calculate the percentage yield

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Phosphoric acid has emerged as a novel chiral Brønsted acid catalyst since 2004. Chiral Brønsted acid protonates imines, thereby forming iminium salt bearing a chiral counter anion, and directs the attack of the nucleophile to the iminium salt.

With the chemical formula H3PO4, phosphoric acid, also known as orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid, is an inorganic solid that contains phosphorus. Colorless and odorless, phosphoric acid is a substance. In its most common form, an 85% aqueous solution, it appears as a syrupy liquid that is colorless, odorless, and non-volatile. Considering that many fertilizers include it, it is a significant industrial chemical.

Acid makes up the substance. The phosphate ion PO results from the removal of all three H+ ions. H2PO, or hydrogen phosphate, is produced when one or two protons are removed, correspondingly. Organophosphate esters are produced by phosphoric acid.

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The most energetic lights are those with higher frequency and lower wavelengths.

Electromagnetic radiation consists of waves of the electromagnetic area, which propagate via space and bring electromagnetic radiant power. It consists of radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays. All of these waves shape a part of the electromagnetic spectrum.

Electromagnetic strength is radiant energy that travels in waves at the rate of light. it can additionally be described as radiant electricity, electromagnetic radiation, electromagnetic waves, light, or the motion of radiation. Electromagnetic radiation can switch heat.

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Using the formula E=(k)(q/r^2),

if q changes to 2q and r changes to 2r,

then, electric field will be:

E = (k) (2q/ 4r^2) = (k)(q/2r^2) = E/2

So, Electric field = E/2

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The process of diluting 1.2 m nh4cl solution to prepare 1.4 l of a 0.25 m nh4cl solution. To determine if each of the follow statement is true or false.

The assertion is true.

What is dilution?

By incorporating more solvent, dilution refers to the process of lowering a solute's concentration in a solution. We increase the solvent without increasing the solute in a solution to dilute it. After that, we vigorously mix the resulting solution to make sure that it is evenly distributed throughout.

The assertion is true.

(1) The equation for dilution

A balance of moles of the solute, in this case NH4Cl, is expressed as M1V1 = M2V2.

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An osmolarity of saline solution is 308 mosmol/L.

m(NaCl) = 9 g; the mass of sodium chloride

V(solution) = 1 L; the volume of the saline solution

n(NaCl) = 9 g ÷ 58.44 g/mol

n(NaCl) = 0.155 mol; the amount of sodium chloride

number of ions = 2

Osmotic concentration (osmolarity) is a measure of how many osmoles of particles of solute it contains per liter.

The osmolarity = n(NaCl) ÷ V(solution)  × 2

The osmolarity = 0.154 mol ÷ 1 L × 2

The osmolarity = 0.154 mol/L × 1000 mmol/m × 2

The osmolarity of the saline solution = 308 mosm/L.

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Answer:

Helium

Explanation:

Answer:

The temperature changed from 25°C to 10°C when exposed to ice.

Explanation:

Chromium(Cr)53 has 24 protons, 24 electrons and 29 neutrons. Ruthenium(Ru)103 has 44 protons, 44 electrons and 59 neutrons.

In any atom, the atomic number, usually denoted with the letter Z, is always equal to the number of protons. For instance, if an atom has the atomic number 10, it will also have 10 protons. In a neutral atom, the number of protons is equal to the number of electrons. To get the number of neutrons, we subtract the number of protons from the atomic mass. The atomic mass or mass number is the addition of the number of protons and neutrons.

In the question, we are only given the atomic mass - 53. To know the number of protons, we need to get the atomic number. On the periodic table, Chromium (Cr) is element number 24 (which is the atomic number) hence, it also has 24 protons. Since the atom is neutral, it will also have 24 electrons. To get the number of neutrons, we subtract 24 from 53, which will give us 29 neutrons.

Ruthenium (Ru) has the atomic number 44, showing that it has 44 protons. It is also a neutral element, so it will also have 44 electrons. The atomic mass we are given in the question is 103. Therefore, to get the number of neutrons, we subtract 44 from 103, which will give us 59 neutrons.

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There is 0.078 grams of copper in a penny.

d = 7.20 g/cm³; density of a penny

diameter of a penny = 19.05 mm

thickness of a penny = 1.52 mm

area of a penny = π/ × (d/2)²

area of a penny = 3.14 × (19.05 mm/2)²

area of a penny = 285 mm²

Volume of a penny is the measure of the amount of space occupied by a penny.

volume of a penny = 285 mm² × 1.52 mm

volume of a penny = 433.2 mm³ = 0.4332 cm³

mass of a penny = 0.4331 cm³ × 7.20 g/cm³

mass of a penny = 3.12 g

mass of a copper = 2.50 % × 3.12 g ÷ 100%

mass of a copper = 0.078 g

number of a copper atoms = 0.078 g ÷ 63.54 g/mol × 6.022×10²³

number of a copper atoms = 7.39×10²⁰

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Students are conducting an experiment to see what colors different salts turn when they are burned. Jack dares Rebecca to taste the other salts to see if they taste like regular table salt. She agrees and her mouth starts burning. Rebecca needs to learn how to behave in the class.

When you add salt to a fire, the flame's color will alter. This isn't because the salt is burning; rather, it happens because the flame's heat affects the energy of the salt's electrons, which causes photons of light to be released. When salt is "burned," a golden flame is frequently visible.

High blood pressure is known to increase the risk of stroke and other health issues, and it is also known to increase the chance of burning in salt. High salt consumption has also been linked in several studies to deteriorating brain function. So, if this occurs, plan for brain surgery and a dedicated teacher to assist the student with wiping and peeling bananas.

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Rutherford’s model of an atom changed scientific knowledge through his assumptions that the atom was made up of a nucleus with positively charged particles.

This is defined as a procedure which is carried out by scientists in other to support or refute a hypothesis and also to ascertain its authenticity through various processes.

Rutherford bombarded a piece of gold foil with alpha particles which also has a positive charge and he discovered almost all the particles went through it.

This made him infer that the gold atoms were mostly empty space thereby leading him to propose his model of atom and made scientists discover that there was proton present in the nucleus of an atom which was used as a foundation by others in discovering more information and details about an atom.

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Answer: It has a lower boiling/melting point than the water

The pressure of an ideal gas is directly proportional to its absolute temperature.

The pressure of an ideal gas  is directly proportional to absolute temperature at constant volume.The volume of a gas is also directly proportional to it's absolute temperature at constant pressure.

When a constant volume of gas is held, the pressure of gas increases as the temperature increases. Mathematically it can be expressed as:

                                P∞T

In order to remove proportionality sign an equal sign is introduced with a proportionality constant 'K',thus the equation becomes

                                P=KT

On dividing both sides of above equation by T , equation becomes

                                 P/T=K

When a plot of pressure versus temperature is plotted a straight line graph is obtained passing through the origin.

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Answer: The bacterium Propionibacterium acnes is considered a key player in acne development. Studies have shown that P. acnes uses sebum as a source of energy, and its presence in the pores initiates an immune response that triggers inflammation

Explanation:

Now, write an equilibrium expression, Ka = [H +][CN -]/[HCN]. Ka = 4.9E-10 = x 2/(0.0620-x). Since the power of the Ka is -10, we can safely assume that the x is small enough to ignore compared to the 0.0620, so it becomes 4.9E-10=x 2/0.0620.

Aqueous solutions are ones in which water serves as the solvent. It is commonly represented in chemical equations by adding (aq) to the relevant chemical formula. For instance, Na+(aq) + Cl could be used to represent a solution of table salt (also known as sodium chloride, or NaCl) in water (aq).

The Latin word aqua is the source of the phrase aquatic, which means to be or to consist of water. Water is a common solvent in chemistry since it functions well as a solvent and is also easily accessible. Since water is usually used as the solvent in experiments, unless otherwise mentioned, the word "solution" frequently refers to an aqueous solution.

A solution where the solvent is a liquid is referred to as a "non-aqueous solution."

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In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.

Knowing that C1V1 = C2V2 means that C1 and C2 are the concentrations of solutions 1 and 2, respectively.

V1 and V2 are, respectively, the volumes of solutions 1 and 2.

We obtain - mg/mL by substituting the given values.

The final concentration of the solution is 0.11 g/ml.

What is a solution?

A solution is a uniform mixture of two or more components with particles smaller than one nanometer. There are many different types of solutions, such as soda water, salt-and-sugar solutions, and others. In a solution, each component appears as a separate phase.There is particle homogeneity, or a uniform distribution of the particles. This explains why a soft drink bottle's entire contents have the same flavour.

In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.

Knowing that C1V1 = C2V2 means that C1 and C2 are the concentrations of solutions 1 and 2, respectively.

V1 and V2 are, respectively, the volumes of solutions 1 and 2.

We obtain - mg/mL by substituting the given values.

In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.

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The iupac name for the following compound is 3,5-dimethylheptanedioic acid

The worldwide organization that represents chemistry and allied disciplines and technology is called the International Union of Pure and Applied Chemistry (IUPAC).

The International Union of Pure and Applied Chemistry (IUPAC) is the foremost expert on chemical language and nomenclature, including the naming of new elements in the periodic table, standardized measurement techniques, atomic weights, and a wide range of other critically analyzed data.

A global standard for naming chemicals is to be established through the IUPAC system of nomenclature in order to improve communication. The system's objective is to assign each structure a distinct and clear name and to associate each name with a distinct and clear structure.

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The frequency released in transition energy is  4.57 x 10¹⁴ Hz.

We need to know about transition energy to solve this problem. Electrons in a hydrogen atom can move to another level of energy. It is also called a transition. In this process, electrons will absorb or release their energy to move. The transition energy can be determined as

ΔE = E2 - E1

where ΔE is transition energy, E2 is the final state of energy and E1 is the initial state of energy.

The state energy of a hydrogen atom can be calculated by

E = -(13.6) / n² eV

E = h.f

where n is the number of energy states, h is Planck constant (4.136 x 10¯¹⁵ eV/Hz), f is frequency.

From the question above, we know that

n1 = 3

n2 = 2

By substituting the following parameter, we get

ΔE = E2 - E1

ΔE = -(13.6) / n2² - (-(13.6) / n1²)

ΔE = -(13.6) / 3² - (-(13.6) / 2²)

ΔE = 3.4 - 1.51

ΔE = 1.89 eV

Calculate the frequency released

ΔE = 1.89 eV

h.f = 1.89

4.136 x 10¯¹⁵ . f = 1.89

f = 4.57 x 10¹⁴ Hz

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The coefficients needed in the balanced equation for the combustion of methane, [tex]CH_{4}[/tex] + [tex]2O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]2H_{2} O[/tex], is 1 for methane and carbon dioxide and 2 for oxygen and water.

The coefficients are numerical numbers in front of element or formula in a balanced equation. It shows the number of elements that should react with the number of other elements to produce a particular amount of chemical products.

The combustion reaction of methane is as follows:

[tex]CH_{4}[/tex] + [tex]O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]H_{2} O[/tex]

To balance this combustion reaction, the number of atoms of each element in the reactant side must be equal to the number of atoms of each element in the product side.

1. Balance C.

[tex]CH_{4}[/tex] + [tex]O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]H_{2} O[/tex]

2. Balance H.

[tex]CH_{4}[/tex] + [tex]O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]2H_{2} O[/tex]

2. Balance O.

[tex]CH_{4}[/tex] + [tex]2O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]2H_{2} O[/tex]

Hence, the coefficients of the balanced equation are 1 for methane and carbon dioxide and 2 for oxygen and water.

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The statement that shows an example that demonstrates the reversibility of a chemical change is rotting of eggs (option B).

A chemical change is any process in which reactants are changed into products by the breaking or creation of chemical bonds.

Chemical changes are opposed to physical change, which only affects the form of a chemical substance, but not its chemical composition.

Examples of chemical changes are as follows:

Therefore, it can be said that rotting process of an egg is an example of a reversible chemical change.

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Answer:

Recharging batteries.

I just took the quick check

Explanation:

If your here for the Physical vs. Chemical Change Quick check for Connexus, here are the answers.

1- Dry ice becoming vapor

2-iron (Fe) reacting to water((H2O)) and oxygen(O) to form iron oxide(Fe2O3)

3-conduct a test to determine the chemical makeup of the molecules

4-Atoms of one or more substances rearrange into a new substance.

5-recharging batteries

I took the quick check, and these were the answers!!

                        Hope this helps someone!

Answer:

yes

Explanation:

corrosion, wearing away due to chemical reactions, mainly oxidation (see oxidation-reduction, oxide). It occurs whenever a gas or liquid chemically attacks an exposed surface, often a metal, and is accelerated by warm temperatures and by acids and salts.

A 100 gram gold nugget contains 5 grams of gold.

Then Percentage of gold in the gold nugget is

(5/100)*100 =5%.

A % in mathematics is a quantity or ratio that is stated as a fraction of 100 (from the Latin per centum, "by a hundred"). Although the abbreviations "pct.", "pct.", and occasionally "pc" are also used, the percent symbol, "%," is frequently used to indicate it. A % lacks dimensions and has no associated unit of measurement.

If there are 50 male pupils for every 100 overall students in the class, 50 of them will be male. There are 250 male students out of 500 total.

Long before the decimal system was developed, computations were frequently done using fractions that were multiples of one hundred.

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Noble gases are exceedingly stable and unlikely to form chemical connections since they have minimal inclination to receive or lose electrons, thanks to the complete valence electron shells of these atoms.

Any one of the seven chemical elements that compose Group 18 (VIIa) of the periodic table is referred to as a noble gas. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson are the constituent elements (Og). The noble gases are inflammable, tasteless, colorless, and odorless. The term "noble" has long been used in science and alchemy to describe how resistant metals like gold and platinum are to chemical reactions. As their atomic numbers rise, the abundances of the noble gases fall.

German chemist Friedrich E. Dorn discovered radon for the first time in 1900, and in 1904 it was recognized as a member of the noble-gas family. In 1904, the work of Rayleigh and Ramsay was recognized with Nobel Prizes.

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Answer:

Hydrogen

Explanation: