1.011 g of chromium and 0.467 g of oxygen. what is the percent by mass of chromium in this compound?

Every substance might have its own unique properties. They can be of characteristic physical and chemical properties  by which they can be identified.

Physical properties of a substance include the properties related to its mass, volume, density its phase change etc. Various physical properties include density, conductivity, melting point, boiling point etc.

Chemical properties of a substance include its reactivity, bond type etc. The reactivity of each substance may vary based on their bond type and intermolecular force of attraction. Each substance shows different reactivity  towards air, water, with other metals and chemicals.

Similarly, the state of each substance it mostly exists will be different. Therefore, by determining the physical and chemical properties of the substance, we can identify the substance.

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Answer:

There isn't any picture for me to see

have a good day :)

Explanation:

Answer:

Temperature is the average kinetic energy of particles of an object. Warmer objects have faster particles and higher temperatures. If two objects have the same mass, the object with the higher temperature has greater thermal energy. Temperature is measured with a thermometer.

The velocity after 5 second =19 m/s

Given

Initial velocity =vi = 12 km/h=3.3 m/s

Time=t = 5 s

Acceleration=a = 2 m/s²

Required

Final velocity, vf

Solution

Motion with constant acceleration

Can be formulated :

vf=vi+at

Input the value :

vf=3.3+2.5

vf=9+10

vf=19 m/s

Sterilization is a food preservation method that involves subjecting food to high temperatures to eliminate all forms of microorganisms, including bacteria, viruses, and fungi.  Among the given options, sterilization is the most effective food preservation method for destroying pathogens, including viruses.

Sterilization is a food preservation method that involves subjecting food to high temperatures to eliminate all forms of microorganisms, including bacteria, viruses, and fungi. This process effectively destroys pathogens and ensures the safety of the food. It is commonly achieved through techniques such as pressure cooking, canning, or autoclaving.

Fermentation, on the other hand, is a preservation method that involves the growth of beneficial bacteria or yeast, which can inhibit the growth of harmful pathogens. While fermentation can reduce the risk of pathogen growth, it may not completely eliminate them.

Freezing is a method that slows down the growth of microorganisms, including pathogens, but it does not necessarily destroy them. Some pathogens can survive freezing temperatures and become active again when the food thaws.

Smoke curing involves exposing food to smoke, which can add flavor and inhibit the growth of certain bacteria. However, it may not be as effective in destroying viruses and other pathogens compared to sterilization.

In conclusion, sterilization is the most effective food preservation method for destroying pathogens, including viruses. It ensures the highest level of safety by eliminating all microorganisms from the food.

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Answer:

10 moles of potassium Chlorate are required to produce 15 mole of oxygen

Explanation:

The balanced chemical equation is

2KClO3(s)→2KCl(s)+3O2(g)

2 moles of potassium Chlorate produce 3 moles of oxygen

Number of moles of potassium Chlorate required to produce 1 mole of oxygen \(= \frac{2}{3}\)

Number of moles of potassium Chlorate required to produce 15 mole of oxygen

\(= \frac{2}{3} * 15\\= 10\)

10 moles of potassium Chlorate are required to produce 15 mole of oxygen

Answer:

Endothermic is identified if the process requires heat as a reactant, since endothermic means "intake of heat", so it has to take in some type of heat.

when ionic salts are dissolved in water, then the temperature of the resulting solution increases.

Amount of the temperature increases depending on the amount of salt dissolved in the water.

Ionic salts and different ionic compounds like will dissolve quicker the hotter the water it's far dissolved in. this is due to the fact hot temperatures make atoms pass quicker and the quicker they circulate, the easier they come apart.

The procedure of dissolving is endothermic whilst much less strength is launched when water molecules “bond” to the solute than is used to tug the solute apart. because less power is released than is used, the molecules of the answer flow more slowly, making the temperature lower.

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The volume of sodium hydroxide used can be determined from the balanced chemical equation of the reaction between propanoic acid and sodium hydroxide. The coefficients in the balanced equation will provide the mole ratio between propanoic acid and sodium hydroxide.

The volume of propanoic acid stock solution used can be determined by the equation:
volume of propanoic acid stock solution used = starting moles of propanoic acid / moles of propanoic acid titrated

The starting moles of propanoic acid is the amount of propanoic acid present in the stock solution. The moles of propanoic acid titrated is the amount of propanoic acid reacted with the sodium hydroxide.

To calculate the starting moles of propanoic acid, you can use the formula:
starting moles of propanoic acid = (volume of propanoic acid stock solution used) * (concentration of propanoic acid)

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Answer:

          i)  Neon (Ne)

           ii)  Fluoride Ion (F⁻¹)

            iii)  Oxide Ion  (O⁻²)

Explanation:

                  Ions are those charged species which are either positively charged (by loosing electrons) called as cations or negatively charged (by gaining electrons) called as anions.

                 In given examples, Neon is a neutral atom which has an atomic number 10. It contains 10 electrons in its neutral state with the electronic configuration 1s², 2s², 2p⁶.

                 Fluorine atom has an atomic number of 9. Therefore, it contains 9 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁵. When Fluorine atom gains one electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶.

                Oxygen atom has an atomic number of 8. Therefore, it contains 8 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁴. When Oxygen atom gains two electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶ forming an Oxide Ion.

Answer:

Granite will be made up of the largest

Oxygen gas (O2) is obtained at the anode and hydrogen gas (H2) at the cathode.

A process known as electrolysis takes place when an electric current is transmitted through a solution. The flow of electric current during electrolysis causes chemical reactions to occur in the solution at the electrodes (anode and cathode).

Tetraoxosulphate VI acid in aqueous form is electrolyzed to produce oxygen gas (O2) at the anode and hydrogen gas (H2) at the cathode.

It is significant to remember that the precise electrolytic reactions might change based on the concentration, temperature, and electrode materials.

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Acids are compounds that produce hydrogen ions (H+) when dissolved in water. They have a sour taste and turn blue litmus paper red. When acids are tested with litmus paper, the paper changes color from blue to red.

Acidic substances are those with a pH of less than 7.0. Acids can be classified as strong or weak based on the concentration of hydrogen ions they produce when dissolved in water. Strong acids are those that ionize completely in water to produce hydrogen ions and are strong electrolytes. Weak acids, on the other hand, ionize partially in water, producing fewer hydrogen ions than strong acids, and are weak electrolytes.

Litmus paper is an acid-base indicator that helps to identify whether a substance is acidic or basic. It is a paper that has been impregnated with litmus dye, a complex mixture of organic compounds that change color in response to changes in the hydrogen ion concentration of a solution.

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Answer:

3.75 ltrs

Explanation:

The final volume of the gas is 3.8L.

Volume is the quantity of space occupied by a liquid, solid, or gas.

Using Avogadro's law.

Avogadro's Law:

V₁/n₁=V₂/n₂

Where V₁ = initial volume

            V₂ = final volume

             n₁ = initial amount of gas in moles

             n₂ = final amount of gas in moles

Avogadro's Law explains when the temperature and pressure are kept constant, volume is directly proportional to gas amount in moles, which means when the volume increases, the amount of gas also increases.

V ∝ n

V₁/n₁ = V₂/n₂

V₁ = 2.5L, V₂ = ?, n₁ = 0.30 mol, n₂ = 0.45 mol

substituting the above values in the equation,

2.5L/0.30 mol = V₂/0.45 mol

                      V₂ = 1.125/0.30 mol

                       V₂ = 3.8L

Hence, 3.8L is the final volume of the gas.

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The quantity of refrigerant in a system is less critical when the system has increased operating pressures.

A low coolant level can cause the engine to overheat. This can cause the compressor not to start or the circuit breaker to trip prematurely. If left unchecked, the engine will eventually burn out and completely stall. Refrigerants with a low critical temperature have a large decrease in cooling performance.

The critical temperature of the refrigerant should be higher than the condensing temperature to obtain greater heat transfer at a constant temperature. When the air conditioner runs low on refrigerant, it loses its ability to transfer heat from within. This means that the air that's being blown into your AC coil isn't cooling properly, so your vents will start circulating warm air throughout your home.

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Answer:

What Julie did wrong is that she did not read the instructions for her lab of wait for her instructor to allow her to get started.

Explanation:

it is essential to know what you are doing in a science lab because you can be injured seriously if you don't stop and take time to read and listen to you instructors directions.

Answer:

trigonal planar

Explanation:

ur welcome :)

Answer:

It is trigonal planer b/c the structure has 3 bonded pairs of electrons and 0 nonbonded pairs.

Explanation:

Valence no. = 1Ga + 3F = 1(3) + 3(7) = 24 valence electrons

Substrate no. = 3F = 3(8) = 24 electrons in bonds

No. of nonbonded pairs of electrons = V - S / 2 = 24 -24 / 2 = 0

Bonded Pairs of electrons = 3 (3 substrates attached by covalent bonds to central element of compound)

Parent structure = Non bonded Prs + Bonded Prs = 0+ 3 = 3

Therefore parent structure and geometry are based on an AX₃ configuration which is trigonal planer.

At 25°C, the concentration of hydronium ions (H3O+) and hydroxide ions (OH-) in water are interrelated through the concept of pH. pH is a logarithmic scale that represents the concentration of hydronium ions in a solution.

The conversion between hydronium and hydroxide concentrations involves the use of the ion product of water (Kw) and the pH equation. At 25°C, the concentration of hydronium ions (H3O+) and hydroxide ions (OH-) in water are related by the ion product of water (Kw). The ion product of water is a constant value at a given temperature and is equal to the concentration of hydronium ions multiplied by the concentration of hydroxide ions in pure water. At 25°C, Kw has a value of \(1.0 \times 10^{-14} mol^2/L^2\).

The pH scale is used to quantify the concentration of hydronium ions in a solution. It is a logarithmic scale, ranging from 0 to 14, where pH 7 represents a neutral solution (equal concentrations of H3O+ and OH- ions). In acidic solutions, the concentration of hydronium ions is higher than that of hydroxide ions, resulting in a pH value less than 7. In basic solutions, the concentration of hydroxide ions is higher than that of hydronium ions, resulting in a pH value greater than 7.

To convert between hydronium and hydroxide concentrations, the pH equation can be used. The pH is calculated as the negative logarithm (base 10) of the hydronium ion concentration: pH = -log[H3O+]. By rearranging the equation, the concentration of hydronium ions can be calculated from the pH: \([H3O+] = 10^{-pH}\). Similarly, the concentration of hydroxide ions can be determined using the equation [OH-] = Kw / [H3O+]. Thus, knowing the pH allows for the determination of hydronium and hydroxide ion concentrations and their interconversion.

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Answer:

Which of the following best explains the relationship between peak-to-peak amplitude and semi-amplitude? Semi-amplitude is half the distance of the peak-to-peak amplitude. Semi-amplitude is the same distance as the peak-to-peak amplitude.

We can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction

What is Percentage Yield?

It compares the actual yield of a reaction to the theoretical yield that would be obtained if the reaction proceeded perfectly, and expresses the result as a percentage.

To calculate the percentage yield for SiO₂ in Trial 1, we first need to determine the theoretical yield. We can do this by using stoichiometry and the amount of SiCl₄, which is the limiting reactant:

1 mole SiCl₄ reacts with 1 mole O₂ to produce 1 mole SiO₂ and 1 mole Cl₂

The molar mass of SiCl₄ is 169.9 g/mol, so 100 g of SiCl₄ is equivalent to 100/169.9 = 0.588 moles.

Since 32.96 g of O₂ was used, which has a molar mass of 32 g/mol, this is equivalent to 32.96/32 = 1.03 moles of O₂.

Since oxygen is the excess reactant, we can use the amount of SiCl₄ to calculate the theoretical yield of SiO₂:

0.588 moles SiCl₄ × 1 mole SiO₂/1 mole SiCl₄ × 60.1 g SiO₂/1 mole SiO₂ = 35.8 g SiO₂

The actual yield of SiO₂ in Trial 1 was 50 g. Therefore, the percentage yield is:

(50 g SiO₂/35.8 g SiO₂) × 100% = 139.7%

This indicates that the experiment produced more SiO₂ than was theoretically predicted. There are a number of possible reasons for this, such as experimental error or the presence of impurities in the reactants.

To determine the leftover reactant, we can use stoichiometry and the amount of SiCl₄ that was used:

0.588 moles SiCl₄ - 0.5 moles SiO₂ produced = 0.088 moles SiCl₄ remaining

The leftover reactant is equivalent to:

0.088 moles SiCl₄ × 169.9 g SiCl₄/1 mole SiCl₄ = 15 g SiCl₄

Therefore, 15 g of SiCl₄ was leftover in Trial 1.

b. We can use the percentage yield from Trial 2 to determine which ratio of reactants is more efficient. Since the amount of SiCl₄ was kept constant, the change in the yield must be due to the change in the amount of O₂. To compare the efficiency of different ratios, we can calculate the theoretical yield for each trial and compare it to the actual yield:

Trial 1: Theoretical yield of SiO₂ = 35.8 g, actual yield = 50 g, percentage yield = 139.7%

Trial 2: Theoretical yield of SiO₂ = 107.4 g, actual yield = 60 g, percentage yield = 55.8%

From these results, we can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction.

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The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

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The change in color and the noticeable decrease in temperature strongly suggest that a chemical reaction has occurred. These observations are consistent with the formation of a new substance.

The student observes several indications that a chemical reaction has taken place in the mixture.

Firstly, the mixture bubbles turn blue, indicating the formation of a new substance. This change in color suggests a chemical transformation has occurred, as the original purple powder and clear liquid have combined to produce a different compound.

Additionally, the container feels much colder after the mixing process. This is likely due to an exothermic reaction taking place, where energy is released in the form of heat. The reaction between the purple powder and clear liquid may have released energy, causing the container to feel colder to the touch.

Overall, the change in color and the noticeable decrease in temperature strongly suggest that a chemical reaction has occurred. These observations are consistent with the formation of a new substance and the release of energy, indicating a chemical transformation has taken place between the reactants.

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Note - The complete questions is "A student conducts an experiment by mixing 100 grams of a purple powder with 100 grams of a clear liquid in a closed container. During the process, the student notices several changes. Firstly, the mixture begins to bubble, and these bubbles gradually turn blue. Secondly, the student observes that the container feels significantly colder than before the mixing occurred. Based on these observations, the student concludes that a chemical reaction has taken place. What could be the possible chemical reaction occurring in the mixture?"

Physical chemistry a  major branch of chemistry would be most concerned with studying a series of chemical reactions in order to measure the amount of heat being released in each one.

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Answer:

The correct answer is Au, H

(Took the exam)

Answer:

D. The energy level of the electron.

Explanation:

There are four quantum numbers which are used to describe the movement and paths or positon of each electron within an atom. Quantum numbers can be used to determine the electronic configuration of atoms and the most likely location of the atom's electrons. Quantum numbers are also used in determining other characteristics of atoms, such as ionization energy and the atomic radius.

The four quantum numbers are namely, principal, azimuthal, magnetic and spin quantum numbers.

Principal quantum numbers are denoted by the symbol ‘n’. They describe the principal electron shell or energy level the atom.The value of the principal quantum number are positive integer values that is equal to or greater than one. The value n = 1 represents the innermost electron shell of an atom, which corresponds to the lowest energy state of an electron. The larger the values of 'n' the greater the energy level and the farther the electron is from the nucleus.

A beryllium atom has 4 protons.

What are Beryllium, protons, atomic mass, and atomic number?

Beryllium (Be) is a chemical element that is silvery-white in appearance. Beryllium is a rare-earth element with an atomic number of 4, an atomic mass of approximately 9, and the symbol Be. It is found in some minerals, primarily beryl, and bertrandite, and is used in aerospace, defense, medical, and other industries.

A proton is a subatomic particle with a positive electric charge (+1 e) and a mass of around 1.007276 amu, which is roughly 1,836 times the mass of an electron.

The number of protons in an atom determines its atomic number. Every atom has a distinct atomic number, and the elements are classified by their atomic numbers. The atomic mass is the sum of the number of protons and neutrons in the nucleus of an atom.

The atomic number is a term used to define the number of protons in the nucleus of an atom. The atomic number is the basis for determining an element's position in the periodic table of elements.

How many protons does a beryllium atom have?

A beryllium atom has 4 protons since it has an atomic number of 4. Beryllium atoms have four protons, four neutrons, and four electrons in their most basic form.

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A beryllium atom has 4 protons.

The beryllium atom of an element corresponds to the number of protons in its nucleus. Therefore, since beryllium has an atomic number of 4, it means it has 4 protons. The atomic mass of beryllium is approximately 9, which means it has a total of 9 nucleons (protons and neutrons) in its nucleus.

Since the atomic number (number of protons) of beryllium is 4, it means that it must have 5 neutrons (9 nucleons - 4 protons = 5 neutrons).

Therefore, a beryllium atom has a nucleus composed of 4 protons and 5 neutrons, and it has 4 electrons orbiting around the nucleus to balance the charge of the protons.

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Answer:

The ionic character of a compound can be used to determine the bond polarity, and the gas phase dipole moment can be used to calculate the bond length. The equation for the bond length (r) in terms of the bond polarity (p) and the bond dipole moment (μ) is given by:

r = (μ) / (4πpε_0p)

Where ε_0 is the vacuum permittivity and p is the bond polarity.

For AgCl, the bond polarity can be calculated from the ionic character:

p = 78.1%

So, substituting the values into the equation, we get:

r = (11.5 D) / (4π * 0.781 * 8.854 x 10^-12 C^2/Nm^2) = 2.8 x 10^-10 m

So the distance between the Ag and Cl atoms in gaseous AgCl is approximately 2.8 x 10^-10 meters.

Explanation:

An element is a pure substance that cannot be broken down into different types of substances. Examples of elements include carbon, oxygen, hydrogen, gold, silver and iron.

A chemical element is a substance defined by a set of atoms that have the same number of protons in their nucleus called the atomic number, hydrogen, gold and iron are examples of elements.

Therefore, we can conclude that a chemical element refers to a certain type of known atoms, which are distinguished from the others in their nature and their fundamental properties.

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Most of the volume of an atom is taken up by the Electron clouds, and most of the mass of an atom is found in the nucleus.

Most of the volume of an atom is taken up by the electron clouds. This is because electrons occupy the space surrounding the nucleus in orbitals and they have a relatively large amount of space between them. The electron clouds represent the region in which electrons are likely to be found at any given time.

Most of the mass of an atom is found in the nucleus. The nucleus is made up of protons and neutrons, which have a much larger mass compared to electrons. Although the nucleus is much smaller in size compared to the electron clouds, it contains almost all of the mass of an atom.

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Answer: iodine

Explanation: Its right trust me I took quiz.

The substance that is most likely to break easily into many smaller pieces is iodine.

Metals are found around the left hand side of the periodic table while nonmetals are found around the right hand side of the periodic table.

Metals are strong and not brittle. They do not break easily like the nonmetals do. Since iodine is a nonmetal, it is brittle. It breaks easily into smaller pieces unlike the metals; sodium, calcium and copper.

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