7. Which of the following is unlikely to
happen to zinc?
A) It is rolled into sheets.
B) It is used to coat a steel hull.
C) It is used in a battery.
D) It is used as an insulator.

Answer:

When 14.51 grams of methane are burned, the number of moles of oxygen gas used can be determined by using the balanced chemical equation:

CH4 + 2 O2 -> CO2 + 2 H2O

Since the coefficients in the equation represent the mole ratios of the reactants and products, we can use the number of moles of methane as the basis for calculating the number of moles of oxygen.

First, we'll calculate the number of moles of methane:

moles of CH4 = 14.51 g / 16.04 g/mol = 0.905 mol

Next, we'll use the mole ratio of CH4 to O2 to determine the number of moles of O2 required for the reaction:

moles of O2 = 2 * moles of CH4 = 2 * 0.905 mol = 1.81 mol

So, the amount of oxygen used is 1.81 moles.

.

Taking into account definition of percent yield, the percent yield for the reaction is 100%.

In first place, the balanced reaction is:

2 FeBr₃ + 3 Na₂S → Fе₂S₃ + 6 NaBr

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 2 moles of FeBr₃ form 6 moles of NaBr, 2.36 moles of FeBr₃ form how many moles of NaBr?

\(moles of NaBr=\frac{2.36 moles of FeBr_{3}x6 moles of NaBr }{2 moles of FeBr_{3}}\)

moles of NaBr= 7.08 moles

Then, 7.08 moles of NaBr can be produced from 2.36 moles of FeBr₃.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

\(percent yield=\frac{actual yield}{theorical yield}x100\)

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

In this case, being the molar mass of NaBr 102.9 g/mole, you know:

Replacing in the definition of percent yields:

\(percent yield=\frac{728.532 grams}{728.532 grams}x100\)

Solving:

percent yield= 100%

Finally, the percent yield for the reaction is 100%.

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Answer: 87%

Explanation:

Answer:

the moon and sun

Explanation:

Answer:

3rd option

Explanation:

Answer:

1 atom only with the unit u.

Explanation:

The formula mass of a substance is defined as the sum of the atomic masses of all atoms in a formula unit of the particular substance in question.

Thus the correct answer is option A

Mixing oil and water is a physical change. A physical change is a type of change in which no new substances are formed, and the substance(s) undergoing the change retains its original properties. It is not a chemical change

That means, in a physical change, the matter changes its form, but it does not change its chemical composition.In the case of mixing oil and water, no new substances are formed, and both oil and water retain their original properties. They only change their state and form a heterogeneous mixture.

It is because oil is hydrophobic, and water is hydrophilic. As a result, they do not mix well together and form two layers with different physical properties: oil floating over the water surface. Besides, physical changes are reversible. In this case, the oil and water can be separated by the process of decantation, filtration, or centrifugation.

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The correct diagram is C as it is the correct electronic configuration for Sodium ion

What is electronic configuration ?

The description of the positions of the electrons around a nucleus is called an electron configuration. As we previously discovered, every neutral atom contains an equal number of protons and electrons. Now, we'll arrange those electrons such that they stand around the nucleus in a way that shows their energy and the nature of the orbital in which they are housed.

Na ( Sodium )

Atomic Number - 11

Electronic Configuration : 2,8,1

Na+ ( Sodium ion)

Electronic Configuration : 2,8

The correct diagram is C as it is the correct electronic configuration for Sodium ion

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what you need:

1 part aloe vera gel or glycerin

2 part isopropyl alcohol (rubbing alcohol) with a concentration of 91%

Essential oil, such as lemon or lavender (this is an optional ingredient for scent)

Clean containers for mixing and an air-tight container for storage

Spoon or whisk for mixing

Explanation:

step:

Combine the aloe vera gel or glycerin with the isopropyl alcohol in a clean container. To get one cup of sanitizer, combine ⅓ cup of gel or glycerin with ⅔ cup of rubbing alcohol.

Mix thoroughly with your spoon or whisk to ensure that the alcohol is evenly distributed throughout the gel.

Stir in five drops of an essential oil, if you're using it. This is entirely optional and is only meant to improve the scent of the sanitizer.

Store the sanitizer in an air-tight container. Alcohol evaporates with time, so an air-tight container will keep your sanitizer effective for longer. A pump or squeeze bottle can minimize evaporation while keeping your sanitizer easily accessible — just make sure the container for your sanitizer is clean and air-tight

[H+]=3.98x10^-9

[H+]=10^-pH=10^-8.4

[H+]=10^-11, base

[H+]=10^-pH=10^-11

A solution with a pH of more than 7 is basic.

Lemon juice because it is more acidic

pH of lemon juice: 2.5

pH of vinegar: 3.3

Since the pH of lemon juice is lower, it is more acidic and will be more effective at removing the basic deposits.

Answer:

the hydrogen atom of one water molecule and the lone pair of electrons on an oxygen atom of a neighboring water molecule.

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.

Petrochemicals are used to create the raw materials used to produce all of the answer choices provided in the question, which includes pesticides, plastics, soaps, and computers. Petrochemicals are chemical compounds that are derived from petroleum or natural gas. These compounds are widely used in various industries to create the raw materials needed for the production of a wide range of products.

Pesticides are chemicals used to kill or control pests, and many of them are made from petrochemicals. Plastics are also made from petrochemicals and are used to make a variety of products such as packaging materials, toys, and automotive parts. Soaps are made from a combination of petrochemicals and natural oils, and they are used for personal hygiene and cleaning purposes. Petrochemicals are also used to create components of computers, such as circuit boards and other electronic parts.

In conclusion, petrochemicals are an essential component in the production of various consumer goods and industrial products, and they play a significant role in modern society.

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Answer:

• Temperature, pressure constant. 1. Ifn I then v 1 = direct relationship.

Explanation:

(0.500 mol)(0.08206 do km 298k) - 1.22 ata. DnRT. 10.0L ... ni nz. :)

First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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Answer:

B

Explanation:

Answer:

sorry dear i don't know sorry

The steepest side of a dune is typically referred to as the slip face and it has a maximum angle of about 34-37 degrees. This angle is known as the angle of repose and it is the maximum angle at which loose materials, such as sand or soil, can maintain stability without sliding down.

The angle of repose is determined by various factors such as the size and shape of the grains, the moisture content, and the force of gravity. The slip face of a dune is constantly changing due to wind and erosion, and the angle of repose can vary depending on the conditions. The slip face can also move over time as the dune migrates and shifts shape. The steepness of the slip face affects the dune's stability and its ability to maintain its shape and size. Understanding the angle of repose and the steepest side of a dune is important in fields such as geology, engineering, and construction. By knowing the maximum angle at which materials can be stable, experts can make informed decisions about building structures on or near dune, as well as predicting the movement and stability of sand dunes over time.

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From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.

The periodic table has been the arrangement of the elements with increasing atomic numbers and similarities. The elements comprising of the same valence electrons are arranged in the same group.

In the periodic table, on moving down the group there has been the atomic size has been increased with the increase in the shell on each period. The increase in the electrons in the same shell results in the increase in the attraction force and thus, the atomic size decreases across the period.

From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.

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The amount of excess acetic anhydride is:Amount of excess acetic anhydride = initial amount - amount used = 0.0196 mol - 0.0145 mol = 0.0051 molTherefore, 0.0051 mol of acetic anhydride is used in the reaction.

The balanced chemical equation for the reaction of salicylic acid with acetic anhydride is given as follows: 2C7H6O3 + C4H6O3 ⟶ 2C9H8O4 + H2OIn this equation, salicylic acid (C7H6O3) is the limiting reagent and acetic anhydride (C4H6O3) is the excess reagent. The stoichiometric ratio between salicylic acid and acetic anhydride is 2:1. This means that for every two moles of salicylic acid, one mole of acetic anhydride is required. To find out how much of the excess reactant is used when the reaction is complete, we need to determine the limiting reagent and the excess reagent. We can do this by calculating the amount of product that each reactant can produce and comparing the values.Let's first calculate the number of moles of each reactant:No. of moles of salicylic acid = mass/molar mass = 2/138 = 0.0145 molNo. of moles of acetic anhydride = mass/molar mass = 2/102 = 0.0196 molTo determine the limiting reagent, we need to calculate the amount of product that each reactant can produce.

According to the balanced equation, 2 moles of salicylic acid produces 2 moles of aspirin, while 1 mole of acetic anhydride produces 2 moles of aspirin. Therefore, the amount of aspirin that can be produced from each reactant is as follows : Amount of aspirin produced from salicylic acid = 2 x 0.0145 mol = 0.0290 molAmount of aspirin produced from acetic anhydride = 2 x 0.0196 mol = 0.0392 molSince salicylic acid can produce only 0.0290 mol of aspirin, it is the limiting reagent. This means that acetic anhydride is in excess. To determine how much of the excess reactant is used, we need to subtract the amount of acetic anhydride used from the amount that was initially present. The amount of acetic anhydride used is equal to the amount of salicylic acid used, which is 0.0145 mol.

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Both polarity and bond length have an impact on the strength of an acid. But bond length has an effect on limited number of acids. So while comparing polarity has more impact on strength of the acid.

Strength of an acid is determined by how easily the acid dissociates and ionizes in water. Dissociation of acid is governed by the following factors.

1. Size of the atom

2. Electronegativity differences

3. Charge on the acid

4. Oxidation state of the central atom.

As the size increases, the bond length increases. The bond becomes weaker and dissociates easily. So the acid become stronger. This trend is usually seen in hydro halides. HCl will be a stronger acid than HF. But the bond length determines the strength of an acid only to a certain extend.

As difference in electronegativity increases, the polarity between atoms increases. So dissociation will become easier. So higher the polarity, greater the acid strength. In almost all acids, polarity determines its strength.

So polarity has more impact than bond length.

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The fundamental difference between an amorphous solid and a crystalline solid is that a crystalline solid has a definite geometric shape and pattern while an amorphous solid does not have a specific pattern.

The fundamental difference between an amorphous solid and a crystalline solid is that a crystalline solid has a definite geometric shape and pattern while an amorphous solid does not have a specific pattern. Crystalline solids have their atoms or molecules arranged in an orderly fashion with a repeating pattern, creating a three-dimensional structure that is often symmetrical. They have sharp and well-defined melting points and are highly organized.

On the other hand, amorphous solids do not have a definite shape or repeating pattern. They are disordered and random, lacking a well-defined melting point. They are often formed by rapidly cooling a liquid or by depositing molecules from the gas phase. Examples of amorphous solids include glass and rubber, while diamond and salt are examples of crystalline solids.

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Answer:

Explanation:

Here, we want to get how the final digit in a measurement is obtained

Mathematically, the final digit can be obtained by estimation

Hence, we say that the value is uncertain

The final digit is obtained by a mark or between the last mark and the next mark in a measurement

Thus, we call this value uncertain since it is estimated

The value of Avogadro's number is:

\(N = 6.02214076*10^{23}\)

So the correct option is the second one.

Avogadro's number represents the number of molecules in a mole.

The value of the Avogadro's number is such that the mass of one mole of a compound is numerically equal to the mass of that compound in daltons.

And, by definition, Avogadro's number is:

\(N = 6.02214076*10^{23}\)

With this in mind, we conclude that the correct option is the second one.

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Answer:

Explanation:

6.02x10^23

Answer: 0.834 L

Explanation:

Volume is the scalar quantity that is the space required by the solution or the substance. The volume required for the 146.3g of 3.00M NaCl is 0.834 L.

Molarity is the concentration of the solution and is given as the ratio of the moles and the volume of the solution. The volume of the solution or the solute is inversely proportional to the molarity of the substance.

Molarity is given as,

\(\rm Molarity (M) =\rm \dfrac{ Moles(n) }{\text{Volume in L}}\)

Here,

Molarity of sodium chloride = 3.00M

Mass of sodium chloride = 146.3g

Molar mass of sodium chloride = 58.44 g/mol

Substituting values in the equation:

\(\begin{aligned} \rm Molarity &= \rm \dfrac{mass}{Molar \;mass \times Volume}\\\\\rm V &= \dfrac{146.3}{ 58.44 \times 3.00}\\\\&= 0.8344 \;\rm L\end{aligned}\)

Therefore, the volume of the sodium chloride required is 0.834 L

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The specific heat capacity of the metal is 35.34 J/g/°C, if the specific heat capacity of the water is 4.18 J/g/°C.

Volume of water = 200 ml

Density of water = 1 gm/ml

So the mass of the water in coffee cup, m₁ = 200×1 = 200 gm

Initial temperature of water, T₁ = 22.1°C

Specific heat capacity of water, S₁ = 4.18 J/g/°C

Mass of the metal, m₂ = 5.1 gm

Initial temperature of the metal, T₂ = 48.6°C

Final combined temperature of both, T = 26.8°C

Let the specific heat capacity of the metal = S₂

Heat gain by the water = heat loss in the metal

S₁ × m₁ × (T-T₁) = S₂ × m₂ × (T₂-T)

4.18 × 200 × (26.8-22.1) = S₂ × 5.1 × (48.6-26.8)

3929.2 = S₂ × 111.18

S₂ = 3929.2/111.18

S₂ = 35.34 J/g/°C

So, the specific heat capacity of the metal is 35.34 J/g/°C.

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Flammability, and the ability to corrode, are examples of J chemical properties.

The ability of a chemical to burn or ignite, resulting in fire or combustion, is referred to as flammability. Fire testing determines the degree of difficulties involved required to cause a chemical to burn. Materials are typically classified as highly flammable, flammable, or non-flammable.

A chemical property is any property of a material that emerges during or after a chemical reaction; that really is, any quality that can only be established by changing a substance's chemical identity. A chemical property is the ability or inability to change one type of matter into another. Chemical properties involve flammability, toxicity, acidity, reactivity (of various kinds), and heat of combustion.

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The statement made by the student is incorrect because the solubility of a substance is usually expressed in terms of the amount of solute that can dissolve in a given amount of solvent at a particular temperature, not in terms of the amount of solution.

Therefore, the correct statement should be that the solubility of KCl at 20 o C is 36g of KCl per 100g of water (or any other specified solvent).

The statement is incorrect because it should state that the solubility of potassium chloride (KCl) at 20°C is 36g of KCl per 100g of water, not per 100g of solution. Solubility refers to the maximum amount of solute (KCl in this case) that can dissolve in a solvent (water) to form a saturated solution at a specific temperature.

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Rutherford conclusion was: Inside of the gold atom consists of empty spaces.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

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You will need to administer 30ml of potassium chloride to the patient.

To calculate the volume (ml) of potassium chloride to administer, we can use a proportion. The given label states that there are 20mEq of potassium chloride in 15ml.

Let's set up the proportion:

20mEq / 15ml = 40mEq / x ml

To solve for x, cross-multiply:

20mEq * x ml = 15ml * 40mEq

Now divide both sides by 20mEq:

x ml = (15ml * 40mEq) / 20mEq

Simplifying further, we get:

x ml = 30ml

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