The criterion of -850mV is referenced to which electrode?
A) Calomel
B) CSE
C) silver-silver chloride
D) Zinc

The part of the system that has two outputs of energy is the bulb.

We would have to recall that on the basis of the first law of thermodynamics, it can be said that energy can not be created nor destroyed but that energy would have to be converted from one form to the other.

In this case, we can see that as the boy is cycling, there is the conversion of the mechanical energy of the boy to the heat and the light energy of the bulb as shown. These are the outputs referred to above.

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25 drops of acid is required to neutralize the 50.0 ml of 0.010m of NaOH in the experiment.

The equation of the reaction is;

NaOH(aq) + HCl(aq) ---------> NaCl(aq) + H2O(l)

We can use the titration formula;

CAVA/CBVB = NA/NB

CA= concentration of acid

VA = volume of acid

CB = concentration of base

VB = volume of base

NA = number of moles of acid

NB = number of moles of base

CB = 0.010 M

VB = 50.0 ml

CA = 0.50 M

VA = ?

NA = 1

NB = 1

Substituting values;

CAVANB = CBVBNA

VA =  0.010 ×  50.0 × 1/ 0.50 × 1

VA = 1 ml

Since the total volume of acid used is 1 ml and each drop contains 0.040 ml

The number of drops required is 1ml/0.040 ml = 25 drops

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Answer:

Therefore the answer is d) The pressure exerted by a gas in the balloon results from collisions between the gas molecules and the balloon walls.

Explanation:

2-Methyl-2-butanol reacts with hydrogen bromide via an SN2 mechanism.

The SN2 (Substitution Nucleophilic Bimolecular) mechanism is a type of reaction in which a substrate molecule is replaced by a nucleophile in a single, concerted step. In this mechanism, the nucleophile attacks the substrate from the backside, pushing the leaving group off and forming a new bond in one step. The reaction rate depends on the concentration of both the substrate and the nucleophile.

In the reaction between 2-methyl-2-butanol and hydrogen bromide, the hydroxyl group in 2-methyl-2-butanol acts as the substrate, while the bromide ion acts as the nucleophile. The bromide ion attacks the substrate from the backside, replacing the hydroxyl group and forming 2-bromo-2-methylbutane. This reaction occurs in a single step and is therefore considered an SN2 mechanism. The reaction is also stereospecific, meaning that it occurs with inversion of configuration at the stereocenter.

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The physical quantity used to qualitatively assess if a reaction is endothermic or exothermic in calorimetry is heat.

Measurements of heat transferred to or from a substance are determined using calorimetry.

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The physical quantity used to qualitatively assess if a reaction is endothermic or exothermic in calorimetry is heat.

Measurements of heat transferred to or from a substance are determined using calorimetry.

Characteristics of endothermic reaction:

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M is equal to (molar mass) (molar volume) (density).

Let's first translate the temperature into Kelvin:

T = 25°C + 273.15 = 298.15 K

The pressure will now be converted to an atm:

760 mm Hg equals 1 atm

Pressure is equal to 740 mm Hg times 760 mm Hg/atm, or 0.9737 atm.

Let's use the ideal gas law equation to determine the molar volume now:

PV = nRT

V is equal to (RT) / P is equal to (0.0821 L atm/mol K) (298.15 K) / (0.9737 atm).

V ≈ 24.93 L/mol

Now, using the provided density, let's get the molar mass:

M = (5.8 g/L) (24.93 L/mol) = (density) (molar volume)

M ≈ 144.394 g/mol

The gas's molar mass is therefore most closely associated with 144.394 g/mol.

The empirical formula for the gas, CH2, reveals the proportional proportion of hydrogen to carbon atoms in the gas. The computed molar mass, however, is considerably more than the molar mass of the empirical formula. This implies that the gas's true molecular composition must have more atoms.

We determine that the ratio is around 3.33 by comparing the molar mass of the empirical formula (14.03 g/mol) to the molar mass of the gas (46.61 g/mol). This suggests that a multiple of the empirical formula makes up the gas' molecular formula.

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Answer:

it contains most of the mass

The given statement "Resonance will only occur when the elements in the molecule keep the same formal charge" is false. Because resonance can occur even if the elements in the molecule do not have the same formal charge in each resonance structure. Option B is correct.

Resonance occurs when there are multiple ways to draw Lewis structures that differ only in the placement of electrons (i.e., the location of double bonds, lone pairs, etc.) but produce the same overall molecule. The formal charges on the individual atoms in the different Lewis structures may vary, but the overall charge of the molecule must remain the same.

For example, consider the nitrate ion (NO₃⁻). The Lewis structure for nitrate ion can be drawn in two different ways, as shown below:

O = N = O⁺ -O⁻

OR

O - N = O

|

O⁻

In the first Lewis structure, the nitrogen atom has a formal charge of +1 and each oxygen atom has a formal charge of -1. In the second Lewis structure, the nitrogen atom has a formal charge of 0 and two of the oxygen atoms have a formal charge of -1.

Hence, B false is the correct option.

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Equation showing the Mn³⁺ cation acting as an acid:

Mn³⁺+ H₂O → MnOH²⁺ + H⁺

A cation is a positively charged ion in a metal element whose formation is carried out by releasing one or more electrons from its outermost electrons to achieve stability.

The intermediate reaction is an acid-base reaction. Acid-base reactions generally produce salt and water. However, in this reaction what is formed is an anion and a conjugate acid-base cation because it uses the Bronsted-Lowry acid-base principle. Mn³⁺ acts as an acid so that it donates a proton MnOH²⁺ to H⁺ so that the species formed are MnOH²⁺ and H⁺.

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Recovery = (Weight of product recovered ÷ Theoretical yield) × 100% Recovery = (0.251 g ÷ 0.27594 g) × 100% Recovery = 91.08%Therefore, the % recovery of the reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride was 91.08%.

Diels-Alder Reaction   Diels-Alder reaction is a chemical process that joins a conjugated diene with a dienophile (a compound containing a double bond) to form a six-membered ring called a cyclohexene ring. It is a chemical reaction that can be used to make new carbon–carbon bonds. The reaction was discovered by two German scientists, Otto Diels and Kurt Alder, in 1928.In the Diels-Alder reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride, the % recovery was calculated using the following data:Weight of maleic anhydride used: 185 mg = 0.185 gVolume of diene used: 0.215 mLWeight of cyclic anhydride crystals recovered: 0.251 g% Recovery:We can calculate the percent recovery using the following formula:% Recovery = (Weight of product recovered ÷ Theoretical yield) × 100The theoretical yield of the product can be calculated from the balanced chemical equation as follows:2,3-dimethyl-1,3-butadiene + Maleic Anhydride → Cyclohexene-1,2-dicarboxylic AnhydrideThe molar mass of 2,3-dimethyl-1,3-butadiene is 68 g/mol. The molar mass of Maleic Anhydride is 98 g/mol. The molar mass of Cyclohexene-1,2-dicarboxylic Anhydride is 146 g/mol.Using these values, we can calculate the number of moles of each reactant: moles of diene used = (0.215 mL)(0.788 g/mL)/(68 g/mol) = 0.00248 mol moles of maleic anhydride used = 0.185 g/98 g/mol = 0.00189 mol The theoretical yield of cyclohexene-1,2-dicarboxylic anhydride = 0.00189 mol × 1 mol/1 mol = 0.00189 molThe theoretical yield of cyclohexene-1,2-dicarboxylic anhydride = 0.00189 mol × 146 g/mol = 0.27594 gNow, we can substitute these values into the percent recovery equation:% Recovery = (Weight of product recovered ÷ Theoretical yield) × 100% Recovery = (0.251 g ÷ 0.27594 g) × 100% Recovery = 91.08%Therefore, the % recovery of the reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride was 91.08%.

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Answer:

Sodium hydroxide

Explanation:

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Nitric acid is a proton donor. (Acids are widely known as proton donors and the other cpds are bases).

The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:

1 gal = 3.785 Liters

30.0 gal = x Liters

x = 3.785 * 30.0

x = 114 Liters

The change in internal energy of the gas is 1505.86 J.

Initial volume = V₁ = 3.20 x 10⁻² m³

Final volume = V₂ = 4.50 x 10⁻² m³

Pressure = P = 2.50 atm

Number of moles = n = 3 mol

Gas constant = R = 8.31 J/mol K

(a) Initial and Final Temperature

The temperature of the gas is given by the ideal gas law:PV = nRT

Initial Temperature :T₁ = PV₁/nR = (2.5 atm x 3.20 x 10⁻² m³) / (3 mol x 8.31 J/mol K) = 321.68 K

Final Temperature:T₂ = PV₂/nR = (2.5 atm x 4.50 x 10⁻² m³) / (3 mol x 8.31 J/mol K) = 458.83 K

(b) Work Done by the gasThe work done by the gas during the expansion can be calculated using the following equation:W = -P∆V

Where ∆V = V₂ - V₁W = -2.50 atm x (4.50 x 10⁻² m³ - 3.20 x 10⁻² m³) = -0.18125 J(c) Heat added to the gas

The first law of thermodynamics relates the change in internal energy (U) of a system to the heat added (Q) to the system and the work done (W) on the system.

∆U = Q - W

where ∆U = change in internal energy = 3/2 nR (∆T) = (3/2) x 3 mol x 8.31 J/mol K (458.83 K - 321.68 K)∆U = 1505.86 JQ = ∆U + WQ = 1505.86 J + (-0.18125 J) = 1505.67875 J(d) Change in Internal Energy

The change in internal energy of the gas can be calculated as:∆U = (3/2) nR (∆T)∆U = (3/2) x 3 mol x 8.31 J/mol K (458.83 K - 321.68 K)∆U = 1505.86 J

Therefore, the initial and final temperatures of the gas are 321.68 K and 458.83 K, respectively.

The work done by the gas during the expansion is -0.18125 J.The amount of heat added to the gas is 1505.67875 J.

The change in internal energy of the gas is 1505.86 J.

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Answer:

Dark clothing

Explanation:

Dark clothing like black absorbs/locks in heat. Since exercise is to burn and tonify our body from unwanted fat it is important to sweat. This is where heat comes in and helps you sweat

I prefer light coloured cloth to wear, as if we wear dark coloured cloth during exercise it will absorb more heat bcox of the thickness and etc etc..but when it's light coloured cloth it won't have much thickness and it's fabric is just suitable for warm places..

Answer:

0.1169g .

Explanation:

1. Multiply the concentration (0.5 mols/Liters) by the volume of solution you want (0.5 Liters) to find the moles of NaCl you need. 2. Multiply the moles of NaCl by its molar mass (58.44 g/mol) to find the grams of solute needed.

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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Answer:

I think it was a huge fish. umm not sure

Explanation:

Answer:

Explanation:

(a) Answer: Intermolecular forces

The reason for this answer is because the substance (paraffin wax) only changed it's state from solid to liquid and didn't undergo a breakage in it's covalent bond within it's carbon chain which would have produced another substance.

(b) Solid substances are generally more dense than there corresponding liquid substances because the more compact particles are (which occurs in solids), the more dense they become. They are thus more dense than liquids because liquids have there particles loosely packed and well spaced making them less dense than there corresponding solids. Hence, the solid paraffin wax was going to become less dense because it's particles moved from being tightly packed (as solids) to being loosely packed (as liquids). Density refers to mass per volume but can also be described as the level of compactness of a substance. Thus, since liquid is not as compact as solid, it can be said to be less dense than solids.

The pair that could be used to construct a single redox electrode is option E, MnO2 and Mn2+.

Explanation:

Redox electrodes are made up of two different substances, one of which is in a reduced form, and the other is in an oxidized state.

There is an exchange of electrons between the two substances in the redox reaction. In a single redox electrode, the oxidized and reduced forms of the same substance are present.

Redox reactions involve oxidation and reduction of species. Oxidation involves loss of electrons, while reduction involves gain of electrons. Here, MnO2 and Mn2+ have an element in common, i.e., Mn.

The oxidation states of Mn in MnO2 and Mn2+ are +4 and +2, respectively. MnO2 can be reduced to Mn2+ by the addition of electrons. Therefore, MnO2 and Mn2+ can be used to construct a single redox electrode.

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Answer:

the answer is A :)

Explanation:

Answer:

i am not sure but its 2 ican"t qry

Explanation:

The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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Answer:

The correct answer is D) Nerve tissue is found in the retina, the rods and cones at the back of the eye.

Explanation:

The rods and cones are photoreceptors (that is nerve cells within the eyes that can sense light) which is situated in the retina.

These photoreceptors also sense colours and send these signals into the optic nerve for transmission to the brain.

Cheers

Answer:

64.25

Explanation:

Average atomic mass = percentage × mass of all isotopes/ 100

Relative atomic mass = 80*64+15*65+5*66/100

=5120+975+330/100

=6425/100

64.25

Answer:

Always equal to the total moles of the products.

Explanation:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction equal to the mass of the reactants.

1 mole is equal to 6.023 × 10 ²³ molecules. 0.182 moles of barium are in a 25.0 g sample of barium.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

I mole of any molecule = 6.023 × 10 ²³

1 mole of barium = 137.328g

To calculate moles, divide mass by molar mass yields number of moles.

25.0g barium × 1mol barium 137.328g barium

= 0.182mol barium

Thus, 0.182 moles of barium are in a 25.0 g sample of barium.

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Provide a few solutions and explain why they should be effective. Make a succinct conclusion. Provide a succinct summary of what you wrote. A good response.

What might a solution look like?

A good example of a solution is a mixture of salt and sugar. Any solution can be broken down into different parts. Solid, liquid, and gaseous solutions can be classified as solutions based on the physical states of the solvent and solute. Both the solute and the solvent have a solid in solid solutions. For instance, mixtures of polymer and ceramic.

What various categories of water-based solutions are there?

1. Depending on whether the solution contains water or not, different kinds of solutions on water as a solvent can be divided into two categories. the mixture in which freshwater acts as just a solvent and any state of homogenous component totally dissolves in it.

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Answer:

A. The acid and base would neutralize to form an element.

Answer:

egc jnpz rof join it on google meet

A substance that can donate a proton (H+) is known as an acid, while one that can accept a proton is known as a base.

The reaction of the dihydrogenphosphate ion with water indicates that it is an amphiprotic substance:H2PO4- + H2O ⇌ H3O+ + HPO42-

The following reaction shows that the dihydrogenphosphate ion is serving as a base:H2PO4- + NH4+ → HPO42- + NH4+H+.

Summary: Hence, the dihydrogenphosphate ion serves as a base in the reaction given as H2PO4- + NH4+ → HPO42- + NH4+H+.

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