How can we preserve esters in reactions involving alcohols? a. Use a strong acid catalyst b. Use a strong base catalyst c. Use a weak acid catalyst d. Use a weak base catalyst

Answer:

Electrical energy is the product of power multiplied by the length of time it was consumed. So if we know how much power, in Watts is being consumed and the time, in seconds for which it is used, we can find the total energy used in watt-seconds. In other words, Energy = power x time and Power = voltage x current.

The amount of current the electric motor having a power of 240 W Will draw from the 24 V supply is 10 A

This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:

Power (P) = voltage (V) × current (I)

P = IV

From the question given above, the following data were obtained:

Voltage (V) = 24 V

Power (P) = 240 W

Current (I) = ?

P = IV

240 = I × 24

Divide both sides by 24

I = 240 / 24

I = 10 A

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a substance that can’t be broken down into another substance.

Answer:

A dipole exists when there are areas of asymmetrical positive and negative charges in a molecule. Dipole moments increase with ionic bond character and decrease with covalent bond character.

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) is equal to the moles of solute per litre of solution.

In this instance, the volume of the solution is 1250 mL, and the molarity of KC1 is 0.75 M. The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) times the number of litres in the solution equals 0.75 M times (1250 mL/1000 mL/L) or 0.9375 moles of KC1.

Consequently, 0.9375 moles of KC1 are present in 1250 mL of 0.75 M KC1. It is significant to remember that a solution's molarity is a measurement of the amount of a solute present in a given volume of the solution.

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The substance reduced in the reaction is: A) Cr2​O72−​ (chromium in the +6 oxidation state).

In the given reaction, the substance that undergoes reduction is Cr2​O72−​ (chromium in the +6 oxidation state). Reduction is characterized by a decrease in oxidation state or the gain of electrons.

By analyzing the balanced chemical equation, we can observe that the reactant Cr2​O72−​ transforms into the product Cr3+, indicating a decrease in the oxidation state of chromium from +6 to +3.

This reduction process involves the transfer of electrons to chromium, causing a reduction in its oxidation state. The other species in the reaction, such as S2​O32−​, H+1, H−1, and S4​O6​2−, do not exhibit a change in their oxidation states and are not undergoing reduction. Therefore, Cr2​O72−​ is the substance that is reduced in the given reaction.

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Answer:

reactants

Explanation:

Answer:

What happens is...

Explanation:

Specifically, it allows your neurons, or nerve cells, to reorganize. When you sleep, your brain's glymphatic (waste clearance) system clears out waste from the central nervous system. It removes toxic byproducts from your brain, which build up throughout the day. This allows your brain to work well when you wake up.

The electrons present in the valence shell of an atom are responsible for the reactivity of atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

There are seven (7).

Explanation:

Since 5 digits are not zero and they're before the zero, they're automatically sig figs.

Since there's a sig fig (#4) after the zero, zero and the # 4  are also sig figs.

Added together, they're are seven

Answer:

look

Explanation:

diffculte ou my good i need help too

The polarity of water is a critical property that enables it to dissolve and transport ions, such as sodium and potassium, to the heart cells, which are essential for proper cardiac function.

The property of water that allows it to carry ions to the heart is its polarity. Water is a polar molecule, which means it has a partial negative charge near the oxygen atom and a partial positive charge near the hydrogen atoms. This polarity allows water molecules to interact with and dissolve ionic compounds, such as sodium and potassium ions, which are crucial for the proper functioning of heart cells. In the bloodstream, sodium and potassium ions are transported by the water molecules.

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Answer:

1.) Write 2 points of difference between water molecule and hydrogen molecule.

• Water molecule associates through hydrogen bonding while hydrogen molecule associates through weak vanderwaal's forces of attraction.

• Water molecule is heavier with greater molecular mass [ 18 grams ] than hydrogen molecule [ 2 grams ].

2.) Differentiate between homogeneous and heterogeneous mixture.

• Homogeneous mixture is a mixture where molecules combine uniformly and adhesive forces are greater than cohesive forces while heterogeneous mixture is a mixture where molecules are non-uniformly combined and cohesive forces are greater than adhesive forces.

\(.\)

Answer:

weight of H₂O formed = 2.3 grams H₂O (2 sig. figs.)

Explanation:

Rxn:                  CH₄(g)         +      2O₂(g)          =>     CO₂(g)           +  2H₂O(g)

Given:                 1.16g                   4.16g                     3.52g                  ? (g)

Moles:         1.16g/16g·mol⁻¹    4.16g/32g·mol⁻¹    3.52g/44g·mol⁻¹

                     = 0.0725mol.        = 0.13mol.             = 0.08mol.    => ? (moles)

Limiting Reactant: Divide each mole value by related coefficient of balanced standard equation (that is, balanced with coefficients in lowest whole number ratios). The smaller value is the limiting reactant.

                    0.0725/1                   0.13/2                0.080/1

                    = 0.0725                 = 0.065              = 0.080

Limiting Reactant is O₂(g) => 0.065 is smaller value after dividing each mole value by related coefficient of balanced equation.

NOTE: When working problem, however, one must use the mole value calculated from given amount in grams. That is, in this case 0.13 mole O₂. The 'divide by related coefficient and check smaller value' is ONLY for identifying the limiting reactant. This trick works for ALL general chemistry problems.

Moles H₂O formed: Since the coefficient of the limiting reactant (O₂) equals the coefficient of water (H₂O), then the moles of water formed is 0.065 mole H₂O.

Weight (in grams) of H₂O formed:

Grams H₂O = moles H₂O  x  formula weight H₂O

                   = 0.13 mole H₂O  x  18 g H₂O/mole H₂O

                   = 2.34 g H₂O  (calculator answer)

                   = 2.3 g H₂O  (final answer should be rounded to  2 sig. figs.)                                                                                                                                        => form of final answer should be based on data in final computation having the least number of sig. figs.                                      

Review: Sequence of calculations

       =>  moles of limiting reactant / coefficient of same cpd. in std. equation               = unknown (X) / coefficient of same (unknown) cpd. in std. equation

       => cross multiply and solve for unknown (X)

       => L.R.(moles) / eqn. coef. of L.R. = X / eqn. coef. of X  

       => (L.R.(calc'd moles)(eqn. coef. of X) = (X)(eqn. coef. of L.R.)

       => X (in moles) = (L.R.(calc'd. moles)(eqn. coef. of X) / (eqn. coef. of L.R.)

        => grams = moles x formula wt.                                                                

        => volume (L) = moles x std. volume (= 22.4L/mole)                                  

        => #particles = moles x Avogadro's Number (= 6.02 x 10²³ parts/mole)

Answer:

the partial pressure of bromine gas is 0.186 atm

Explanation:

Answer:

C rusting iron

Explanation:

water evaporating and melting is an example of physical change it doesn't change the H2O composition of the atoms, rubbing water on paper doesn't change any atoms or molecules. so the only answer that leaves is rusting iron because when an iron nail comes into contact with water and is then exposed to the air, it rusts, forming a brown-red substance. This process changes the chemical composition of the original substance.

The main plant structure that provides most of the water necessary for photosynthesis is the root system.

The root system of a plant is responsible for absorbing water from the soil. It consists of roots that extend deep into the ground, allowing the plant to access water from underground sources such as groundwater or moisture in the soil. Through a process called osmosis, water moves into the roots and is transported to the rest of the plant, including the leaves where photosynthesis takes place.

The water absorbed by the roots provides the necessary hydration for the photosynthetic process, allowing plants to produce glucose and oxygen using sunlight and carbon dioxide. Thus, the root system plays a vital role in providing most of the water required for photosynthesis in plants.

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The ability of glass to behave in some kind of a superplastic manner and to experience extremely large uniform elongations above high temperatures is a feature that makes it possible to produce bottles.

The term "material" describes something that is used to create another item. Cloth or any other item formed of matter that exists throughout the physical world can be referred to as material. As just a noun and also an adjective, "material" has several more meanings.

Metals, polymers, plus ceramics are the three main categories of materials. Steel, fabric, and ceramics are a few examples of them. These classes often have quite distinct origins, traits, and uses.

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The balanced equation for the given reaction is:

CaF2(s) → Ca(s) + F2(g)

This equation indicates that one molecule of calcium fluoride (CaF2) decomposes into one molecule of calcium (Ca) and one molecule of fluorine gas (F2). The equation is balanced because the number of atoms of each element is equal on both sides of the equation.

The water level in the graduated cylinder would rise to a new volume after placing the piece of brass in it.

When you place the piece of brass in the water, it displaces an amount of water equal to its own volume. This is because objects submerged in a fluid displace a volume of fluid equal to their own volume.

The density of brass is typically around 8.5 g/ml. Since the mass of the brass is given as 105 g, we can use the density formula (density = mass/volume) to find the volume of the brass.

By rearranging the formula, we get volume = mass/density. Plugging in the values, we find that the volume of the brass is approximately 105 g / 8.5 g/ml = 12.35 ml.

So, when you place the brass in the graduated cylinder, it displaces 12.35 ml of water. Therefore, the water level in the cylinder would rise to a new volume of 50 ml + 12.35 ml = 62.35 ml.

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

The chemist weighed out 101. g of sodium. The number of moles of sodium she weighed out is approximately 2.32 moles.

To calculate the number of moles, we divide the given mass of sodium by its molar mass. The molar mass of sodium is 22.99 g/mol.

Number of moles = Mass of sodium / Molar mass of sodium

Number of moles = 101 g / 22.99 g/mol

Number of moles ≈ 2.32 mol

Rounding to 3 significant digits, the number of moles of sodium is approximately 2.32 mol. Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal that belongs to the alkali metal group on the periodic table. Sodium is abundant in nature and is commonly found in compounds such as sodium chloride (table salt), sodium carbonate (washing soda), and sodium hydroxide (caustic soda).

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a) 1.16 grams of O₂ will be formed from 3.76 grams of KClO₃.

b) The grams of KClO₃ needed to make 30.0 grams of KCl is 37.7 grams.

c) The grams of KCl formed from 2.73 grams of KClO₃ is 1.21 grams.

a) Calculate the molar mass of KClO₃:

Molar mass of KClO₃ = (2 * K) + Cl + (3 * O) = (2 * 39.10) + 35.45 + (3 * 16.00) = 122.55 g/mol

Determine the number of moles of KClO₃:

Moles of KClO₃ = mass of KClO₃ / molar mass of KClO₃ = 3.76 g / 122.55 g/mol

Use the stoichiometric ratio from the balanced equation: According to the balanced equation, 2 moles of KClO₃ produce 3 moles of O₂.

Moles of O₂ = moles of KClO₃ * (3 moles of O₂ / 2 moles of KClO₃)

Convert moles of O₂ to grams: Mass of O₂ = moles of O₂ * molar mass of O₂ = moles of O₂* 32.00 g/mol

Substituting the calculated values: Mass of O₂ = (3.76 g / 122.55 g/mol) * (3 mol O₂ / 2 mol KClO₃) * 32.00 g/mol ≈ 1.16 grams of O₂

b) Calculate the molar mass of KCl:

Molar mass of KCl = 39.10 g/mol + 35.45 g/mol = 74.55 g/mol

Determine the number of moles of KCl: Moles of KCl = mass of KCl / molar mass of KCl = 30.0 g / 74.55 g/mol

Since the stoichiometric ratio between KClO₃ and KCl is 1:1, the number of moles of KClO₃ required will be the same as the number of moles of KCl.

Convert the moles of KClO₃ to grams: Mass of KClO₃ = moles of KClO₃ * molar mass of KClO₃

Substituting the calculated values: Mass of KClO₃ = (30.0 g / 74.55 g/mol) * 122.55 g/mol ≈ 37.7 grams of KClO₃

c) Calculate the molar mass of KClO₃ as done in part (a).

Determine the number of moles of KClO₃: Moles of KClO₃ = mass of KClO₃ / molar mass of KClO₃ = 2.73 g / 122.55 g/mol

Since the stoichiometric ratio between KClO₃ and KCl is 1:1, the number of moles of KCl formed will be the same as the number of moles of KClO₃

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Answers

condensed structure:

CH₃(CH₂)₃CH₃

molecular formula:

C₅H₁₂

IUPAC name:

pentane

Answer:

D

Explanation:

Reduction refers to gain in electrons. Hence it is D

Oxidation occurs when the element loses electrons. Hence A is wrong

Answer:

2.7

Explanation:

Density= mass/volume

= 1.35/0.500

= 2.7

Answer:

c i think

Explanation:

Start by setting up your materials you would put one plant in mulch and one without. After 2-3 weeks of proper care of the plants you record your findings, did the plant grow more without without the mulch?