What mass of ethanol, C2H5OH a nonelectrolyte, must be added to 10.0 L of water to give a solution that freezes at −10.0°C? Assume the density of water is 1.0 g/mL. Kf of water is 1.86°C/m.

Answer:I think it would be the third one.

Explanation:

Exothermic refers to chemical interactions that aerobic respiration. Combustion reactions release higher energy. Endothermic refers to atoms and molecules that either use or absorb reactive power.

A chemical process known as an endothermic releases energy as heat or light. It is an endothermic reaction's opposite. Chemical equation expressed as reactants + products + energy. An reaction mechanism is one in which electricity is given off as light or warmth.

A response is deemed to be exothermic if it produces heat while also undergoing a net decrease in basic enthalpy change. Samples include those type of combustion, iron rust, including water froze. Exothermic processes are those that discharge heat and energy into the surroundings.

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Answer:

1187   ( four   S.D. )

Explanation:

(433.621 - 333.9) × 11.900         333.9 has only 4 S.D.      answer should only have 4 S.D

= 1186.6799 = ~  1187     with 4 Significant Digits

The balanced chemical equations of the reactions are given below:

1. Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)

2. 2 Li (s) +  2 H₂O (l) ----> LiOH (aq) + H₂ (g)

A balanced chemical equation is an equation in which the number of moles of atoms of elements in a given reaction is equal to the sum of the number of moles of atoms of each element that is produced.

A balanced chemical equation is in accordance with the law of conservation of mass which states that matter can neither be created nor destroyed.

When balancing chemical equations, numerical coefficients are added in front of moles of atoms of an element or moles of a given compound taking part in the reaction.

The balanced chemical equation of the reaction of magnesium and water as well as the reaction of lithium and water is given below:

Magnesium and water:

Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)

Lithium and water:

2 Li (s) +  2 H₂O (l) ----> LiOH (aq) + H₂ (g)

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Answer:

This would be 3S^1.

Explanation:

It  would be 3s^1 because that is how the orbitals are formed.

It would be form lowest to highest: s,p,d,f.

Then it would go to highest, 2 =s, 6=p, d =10, f= 14.

So, it would be: 1s2, 2s2, 2p6, 3s2.

Since 3s2 isn't on here, then 3s1 would become the answer.

When the moving car brakes to the stop the kinetic energy of car will be converted to the heat energy.

The mechanical brake will be applies to the friction force and it convert the kinetic energy of the car into the thermal energy that which then dissipates on atmosphere. The process of the braking will follow the principle of the conservation of the energy.

The conservation of the energy is the principle, that is expressed in its the most general form, and it is the first law of the thermodynamics. The first law of thermodynamics explains that "the energy of the universe remains the same."

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This question is incomplete, the complete question is :

A car in motion has kinetic energy. A moving car is suddenly stopped. Why does the car stop? Where did the energy go?

Answer: 8 (feet)

Explanation:

24 inches = 2 feet

48 inches = 4 feet

12 inches = 1 foot

To find volume you do Base * Width * Height

2*4*1 = 8

Hope this helps!

The correct answer is  8 (feet).

How to calculate ?

Therefore, 2*4*1 = 8

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The reaction that would most likely require the use of an inert electrode is a reaction involving highly reactive substances or species that can react with or be oxidized by the electrode material itself.

One such reaction that often requires the use of an inert electrode is the electrolysis of aqueous solutions containing halide ions (Cl-, Br-, I-). When halide ions are electrolyzed, they can undergo oxidation at the anode, resulting in the formation of halogen gas (Cl2, Br2, I2). However, these halogens are highly reactive and can react with many common electrode materials, such as metals, leading to unwanted side reactions.

To prevent these undesired reactions, an inert electrode, usually made of materials such as platinum, gold, or graphite, is employed. Inert electrodes do not react with the halogen gases formed during electrolysis, allowing the desired reaction to take place without interference from the electrode material itself.

For example, in the electrolysis of a sodium chloride (NaCl) solution, chloride ions (Cl-) can be oxidized at the anode to form chlorine gas (Cl2). To ensure that the chlorine gas is produced without any reactions involving the anode material, an inert electrode like platinum or graphite is used.

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Answer: 1.5 moles of CO2

Explanation:

3 moles of Fe and 2 moles of CO2. This is because the amount of moles of each reactant is given, and they are reacting in a 1:1 molar ratio, meaning that the number of moles of each product will also be in a 1:1 molar ratio. Therefore, 3 moles of Fe2O3 will produce 3 moles of Fe, and 1.5 moles of CO will produce 1.5 moles of CO2.

Answer:

1 mole of Fe203 react with 1.5

Explanation:

The balanced chemical equation is:Fe2O3 + 3CO → 2Fe + 3CO2According to the stoichiometry of the equation, 3 moles of Fe2O3 react with 3 × 1.5 = 4.5 moles of CO. However, since only 1.5 moles of CO are available, it is limiting the reagent, and Fe2O3 is in excess.Thus, the amount of CO consumed will be limited by 1.5 moles, and the amount of Fe2O3 consumed will be calculated as:3 moles Fe2O3 × (1.5 moles CO / 3 moles CO) = 1.5 moles Fe2O3According to the balanced equation, for every 3 moles of CO consumed, 2 moles of Fe and 3 moles of CO2 are produced. Therefore, the amount of Fe and CO2 produced can be calculated as:2 moles Fe × (1.5 moles CO / 3 moles CO) = 1 mole Fe3 moles CO2 × (1.5 moles CO / 3 moles CO) = 1.5 moles CO2So, the reaction produces 1 mole of Fe and 1.5 moles of CO2.

Answer:

42.64 M

Explanation:

Step 1: Given data

Step 2: Convert the volume of the solution to liters

We will use the relationship 1 L = 1,000 mL.

\(189.98 mL \times \frac{1L}{1,000mL} = 0.18998L\)

Step 3: Calculate the molarity of the solution

The molarity is equal to the moles of solute divided by the liters of solution.

\(M= \frac{8.1mol}{0.18998L} = 42.64 M\)

Answer:

No

Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride

Answer:

C. Golden rice enriched with vitamin A

Explanation:

U can use molar ratio of

Li : Li2SO3

2 : 1

so 3.33÷2=1.665 so 1.67 moles

then u can use the

moles = mass ÷ mr

= 12.33÷ 100.08

= 0.123 moles of CuSO3 then use the molar ratio

CuSO3 : Cu

1:1

so 0.123 moles of cu

hope this make sense:)

To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

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1) It means that the wine is 15 ABV (alcohol by volume) or the ethanol in the wine solution is 15 % v/v. It has 15 ml of pure ethanol in 100 ml of wine.

2) If in 100 mL of wine we have 15 mL of alcohol, we can use that relationship to find the volume of alcohol in 1 L.

Concentration of ethanol = 15 ml of ethanol/100 mL of wine = 15 ml of ethanol/0.10 L of wine

Volume of ethanol = 1 L of wine * 15 ml of ethanol/(0.10 L of wine)

Volume of ethanol = 150 mL

3) We know that the density is 0.8 g/cm³ or 0.8 g/mL

Density = mass/volume

mass of ethanol = density of ethanol * volume of ethanol

mass of ethanol = 0.8 g/mL * 150 mL

mass of ethanol = 120 g

4) The fermentation reaction that is used to produce etanol in wine is this one:

glucose ---> ethanol + carbon dioxide

C₆H₁₂O₆ ------> 2 C₂H₅OH + 2 CO₂

The first step to find the answer is to convert the mass of ethanol into moles of it using the molar mass.

atomic mass of C = 12.01 amu

atomic mass of H = 1.01 amu

atomic mass of O = 16.00 amu

molar mass of ethanol = 2 * 12.01 + 6 * 1.01 + 1 * 16.00

molar mass of ethanol = 46.08 g/mol

moles of ethanol = mass of ethanol /(molar mass of ethanol)

moles of ethanol = 120 g/(46.08 g/mol)

moles of ethanol = 2.60 moles

Let's consider the % yield.

% yield = actual moles of ethanol/(theoretical moles of ethanol) * 100

theoretical moles of ethanol = actual moles of ethanol/(% yield) * 100

theoretical moles of ethanol = 2.60 moles/75 * 100

theoretical moles of ethanol = 3.47 moles

C₆H₁₂O₆ ------> 2 C₂H₅OH + 2 CO₂

According to the equation of the reaction 2 moles of ethanol are produced by 1 mol of glucose. We will use that conversion to find the moles of glucose necessary to produce 3.47 moles of ethanol.

moles of glucose = 3.47 moles of C₂H₅OH * 1 mol of C₆H₁₂O₆/(2 moles of C₂H₅OH)

moles of glucose = 1.735 moles

And finally we can convert those moles into grams using the molar mass of glucose (C₆H₁₂O₆).

atomic mass of C = 12.01 amu

atomic mass of H = 1.01 amu

atomic mass of O = 16.00 amu

molar mass of glucose = 6 * 12.01 + 12 * 1.01 + 6 * 16.00

molar mass of glucose = 180.18 g/mol

mass of glucose = moles of glucose * molar mass of glucose

mass of glucose = 1.735 moles * 180.18 g/mol

mass of glucose = 313 g

Answer: 313 g of glucose should be used.

The balanced form of the nuclear equation is as follows; 249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n.

A nuclear equation is process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

According to this question, Californium element is a reactant to produce dubnium and a neutron as products.

However, the law of conservation of mass must be fulfilled by ensuring the mass and atomic numbers of elements in reactant and product side are the same.

249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n

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The compound which represents the molecular formula with a scale factor of 2 is \(C_6H_8O_6\) . The correct answer is option A

The empirical formula of a compound gives the simplest whole-number ratio of the atoms present in the compound. To obtain the molecular formula, we need to know the actual number of atoms in the molecule.

To find the molecular formula with a scale factor of 2, we need to multiply the subscripts in the empirical formula by 2.

Therefore, the molecular formula with a scale factor of 2 would be:

\(C_3H_4O_3\) × \(2\)  = \(C_6H_8O_6\)

So option A is the correct answer.

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Answer: B) Ten moles of sodium hydroxide and five moles of hydrogen gas will be produced

Explanation: Got it right on USATestPrep

2 HCl(aq) + Sr(OH)₂(aq) → SrCl₂(aq) + 2 H₂O(l).

Complete neutralization occurs when strong acids such as hydrochloric acid and HCl are mixed with strong bases such as sodium hydroxide and NaOH. Strong acids and strong bases decompose or completely dissociate into their constituent ions when dissolved in water. When a strong acid reacts with a strong base, the resulting salt is neither acidic nor basic.

Neutral. For example, when HCl hydrochloric acid a strong acid reacts with NaOH a strong base the resulting salts are sodium chloride and water. In a neutralization reaction, an acid reacts with an equimolar amount of base to form salt and water. An example would be the reaction between a strong acid and a base. The sodium chloride formed is the result of the neutralization reaction.

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Answer:

Explanation: Liquid Chromatography  

I'm sorry if i'm wrong

Answer:

9

Explanation:

Answer:

9

because i studied this

The number of atoms :

C = 6 x 5 x 10²¹ = 3 x 10²²

H = 12 x 5 x 10²¹ = 6 x 10²²

O =  6 x 5 x 10²¹ = 3 x 10²²

Given

1.5 g glucose(C₆H₁₂O₆)

Required

The number of atoms

Solution

mol of glucose(MW=6.12+12.1+6.16=180 g/mol) :

mol = mass : MW

mol = 1.5 : 180

mol = 0.0083

Number of molecules = 0.0083 x 6.02 x 10²³ = 5 x 10²¹

There are 6 C, 12 H and 6 O, so number or atoms :

C = 6 x 5 x 10²¹ = 3 x 10²²

H = 12 x 5 x 10²¹ = 6 x 10²²

O =  6 x 5 x 10²¹ = 3 x 10²²

The reaction time decreases as the temperature increases of the reaction mixture increases.

A sample record of results is:

An increase in temperature leads to an increase in reaction rate or a decrease in reaction time.

The increase in temperature provides more thermal energy to the reactant molecules, which leads to an increase in the average kinetic energy of the molecules. As a result, more reactant molecules have sufficient energy to overcome the activation energy barrier and undergo successful collisions, leading to an increased reaction rate.

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Based on the description of the potential energy diagram provided, the diagram made by the student appears to be correct.

The potential energy diagram represents the energy changes that occur during a chemical reaction. In an endothermic reaction, the products have higher potential energy than the reactants, meaning energy is absorbed from the surroundings.

The curve line on the graph indicates the energy changes throughout the reaction pathway. It starts at a higher level, representing the initial potential energy of the reactants. As the reaction progresses, the potential energy decreases, indicating the formation of products with lower potential energy.

The broken horizontal line from point X on the y-axis to the point where the curve begins represents the activation energy (Ea) of the reaction. Activation energy is the energy barrier that must be overcome for the reactants to convert into products.

Point X on the y-axis indicates the potential energy of the reactants at the start of the reaction, and the broken line shows the energy required to initiate the reaction.

The broken horizontal line from point Y on the y-axis to the point where the curve ends represents the potential energy of the products. Point Y represents the potential energy of the products at the end of the reaction.

Overall, the student's diagram correctly represents an endothermic reaction, showing the potential energy changes, the activation energy, and the final potential energy of the products. The curve line starts at a higher level (representing the higher potential energy of the reactants) and ends at a slightly lower level (representing the lower potential energy of the products).

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When the reaction of  Grignard reagent reacted with methanol will yield a tertiary alcohol. Therefore, Option C tertiary alcohol is correct.

Contains a carbon-metal link, Grignard reagents are chemicals used in catalysis. They generally result from the anhydrous reaction of magnesium metal with an alkyl or aryl halide. Because of their high reactivity, Grignard reagents frequently act as nucleophiles in organic reactions.

An alkyl group from a Grignard reagent binds to the oxygen atom of methanol (CH3OH) when it interacts with the methanol, breaking the carbon-metal connection. A precursor alkoxide is created as a result. The equivalent alcohol is then produced by protonating the intermediate alkoxide.

The reaction of a Grignard reagent with methanol leads to the formation of a tertiary alcohol.

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Answer:

X represents London dispersion forces, and Y represents dipole-dipole forces.

Explanation:

Answer:

the powerhouse of the cell

Explanation:

the answer is in the image above