125 grams of HCl are used. Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g). What is the percent yield if 1.2 moles of hydrogen are actually produced?

Since the reaction is not spontaneous at room temperature, the ΔH will be positive.

They are reactions that require no additional effort in order for them to take place under certain conditions.

For spontaneous reactions, the change in the energy of the system, otherwise known as ΔH, is always negative. On the other hand, reactions with positive ΔH are non-spontaneous.

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Answer:

Option B and A

Explanation:

Answer: 0.699 M

Explanation:

[tex]M_{A}V_{A}=M_{B}V_{B}\\(0.750)(46.6)=M_{B}(50.0)\\M_{B}=\frac{0.750)(46.6)}{50.0}=\boxed{0.699 \text{ M}}[/tex]

Answer:

Parts per million - Option B

Explanation:

Is it possible to explain this ?
Hope this helped and have a good day

Answer: b parts per million

Explanation:

Answer:

B

Explanation:

The answer is sunlight solar cells directly convert the sunlight into electricity

Answer:

B

Explanation:

Sunlight, or solar energy is the type of energy which is not used by a turbine to generate electricity.

Answer:

It is repelled ( pushed away from the larger ball)

Explanation:

Like charges repel.

Opposites attract.

Gravitational force is the force of attraction. This kind of force forms an action-reaction in a situation.

Gravitational force is the force present that is directly proportional to the masses and inversely to the square of the distance present from the center of the masses.

It is independent of the medium and remains constant in any matter whether it is water, air, or soil. It is conservative and is a central force that obeys Newton's law of motions.

Therefore, the gravitational force follows the action and reaction.

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Explanation:

To a reaction to be occured

The formula is

IE is internal energy of reactant and AE is activation energy and TE is threshold energy .

So option D is correct

Answer:

5095 JULLITET LI\

Explanation:

Answer:

B.C5H12 that is pentane

Explanation:

hydrocarbon has only hydrogen and carbon atoms

Answer:

CH2

Explanation:

We are given that a compound is 14.40% hydrogen and 85.60% carbon.

Let the mass of the substance be 100g.

Mass of the hydrogen: 14.40% of 100 = 14.40 g

Mass of the carbon: 85.60% of 100 = 85.60 g

Now, let's find the moles of hydrogen:

[tex]14.40 g*\frac{1 mole}{1gH} = 14.40 mole[/tex]

Moles of carbon:

[tex]85.60g*\frac{1 mol}{12gC} = 7.13mol[/tex]

Let's put these in a ratio and simplify:

7.13 mole C: 14.40 mole H

1 mole C: 2 mole H

Therefore, the empirical formula of this compound is CH2.

Hope this helps!! If you have any questions about my work, please let me know in the comments!

Answer:

Look at the pH level.

Explanation:

The best way to determine whether a solution is acidic or basic is to look at its pH level. The pH of a solution is a number between 0 and 14.

If a solution has a pH of less than 7, then it is acidic.

If a solution has a pH of 7, then it is neutral.

If a solution has a pH of greater than 7, then it is basic.

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Answer:

Blank = rodent(s)

Explanation:

Rodents are by far the largest group of mammals.

Staggered conformers are lower in energy than eclipsed conformers , Option A is the right answer.

The arrangement of atoms in molecule such that  the dihedral angle formed is 60 degree is called Staggered Conformation and the arrangement of atoms in which the dihedral angle is 0 degree is called Eclipsed Confirmation

Among the given statements

The statement that best describe the stability of Staggered Conformers and eclipsed conformers is Staggered conformers are lower in energy than eclipsed conformers .

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The number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.

The number of moles in the formula units of a substance is calculated by dividing the formula unit by Avogadro's number.

According to this question, 3.20 x 10² formula units are in calcium iodide. The number of moles is as follows:

no of moles = 3.20 x 10²² ÷ 6.02 × 10²³

no of moles = 0.53 × 10-¹

no of moles = 0.053 moles

Therefore, the number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.

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The rate of a reaction that follows the rate law: rate = k[A]m[B]n, is A. 4.5 (mol/L)/s.

The rate of reaction is the speed by which the reactions happening.

The given values are k=1.5.

[A]=1M

[B]=3m

m=2

n=1

The formula is v = k[A] ˣ [B] y

v = 1.5 x 1 ² x 3¹ = 4.5  (mol/L)/s

Thus, the correct option is A. 4.5 (mol/L)/s.

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Answer:

Calcium reacts with Oxygen to form Calcium Oxide

Explanation:

Reactant: Calcium reacts with Oxygen to form Calcium Oxide

Products: Calcium + Oxygen

Chemical equation: Ca + 02> CaO

Organic compounds including carboxylic acids are named uisng IUPAC nomenclature technique.

A carboxylic acid is an organic acid that contains a carboxyl group (C(=O)OH) attached to an R-group.

The general formula of a carboxylic acid is R−COOH or [tex]RCO_2H[/tex], with R referring to the alkyl, alkenyl, aryl, or other group.

Following are the names of given struture ;

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The gas molecules move between the system and the surroundings follow PV=nRT.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.

In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.

The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

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Answer:

See explanation.

Explanation:

I highly suggest you watch OChem Tutor's videos on IUPAC nomenclature because the actual naming would take a lot of time to teach in text-based format. But here is how to name them:

1) I think there are two seperate pictures for number 1. The molecule on the left is 1-pentene and the one on the right is 4-methyl-1-pentene. If the whole thing is one molecule but there is just a bond missing where the red marker numbers are, that molecule would be 9-methyl-1,6-decadiene.

2) 4-methyl-2-pentene

3) 2,4-octadiene

4) 1,5-nonadiene

5) 2,5-dimethyl-3-hexene

6) 3,6-dimethyl-2,4-heptadiene

7) 2,5,5-trimethyl-2-hexene

Answer:

what is super hard?

Explanation:

what?

The measure of the randomness of the system is the change in the entropy. The mixing of two gases and decomposition of the solid will increase the entropy.

Entropy is the disorderliness and the randomness of the system when the thermal energy is not present in a sufficient amount to initiate the reaction. In system A, when two gases are mixed then the entropy increases as the number of gaseous molecules increases.

In system B, when a solid powder gets decomposed to form a solid product and a gaseous product the entropy increases as along the solid particles the gas is also produced.

Therefore, in both the systems the entropy increases.

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The volume of excess oxygen will 2.28 L

From the equation of the reaction:

[tex]CH_4(g) + 2O_2(g) --- > CO_2(g) + 2H_2O(g)[/tex]

The mole ratio of the two reactants is 1:2.

1 mole of gas at STP = 22.4 L

Mole of 29.2 L of methane at STP = 29.2/22.4 = 1.3 moles

Mole of 63.3 L of oxygen at STP = 63.3/22.4 = 2.8 moles.

Thus, oxygen is in excess because 1.3 x 2 = 2.6 moles is needed to react with 1.3 moles methane.

Excess mole of oxygen = 2.8 - 2.6 = 0.2 moles

Volume of 0.2 moles at STP = 22.4 x 0.2 = 2.28 L

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A chemical reaction involves an interaction between two or more species to yield a product.

A chemical reaction involves an interaction between two or more species to yield a product.

The following is the classification of the reactions based on type;

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Answer:

.334 M

Explanation:

Ca Cl2 is calcium chloride

Ca = 40.078 gm/mole

Cl = 35.45 gm/ mole

    40 . 078 + 2 * 35.45 = 110.978 gm/mole    for Ca Cl2

28.9 gm  / 110.978 gm/mole   = .260 moles CaCl2

.260 moles/ .78 liter = .334 M

In a sunny day, the plant makes use of water through photosynthesis and transpiration.

Photosynthesis is defined as the process by which green plants, which has chlorophyll, makes use of water and carbondioxide in the presence of sunlight as energy to form oxygen and glucose.

Transpiration is the movement is of water out of the plant through its pores located on the leaves, roots and stem. This process is increased in sunny seasons.

Therefore, In a sunny day, the plant makes use of water through photosynthesis and transpiration.

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Answer:

in transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change.

Explanation:

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