Avogadro’s number is the number of particles in one mole of a pure substance, true or false?

Answer:

On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Answer:

See explanation.

Explanation:

Are you literally posting your entire you chemistry homework on this site, one question at a time? Anyways, the heat death refers to the second law of thermodynamics and entropy. Heat is constantly flowing from warmer to cooler objects and never the other way around. This heat flow increases entropy, which is constantly increasing. The universe will eventually disperse all of its heat energy away to continuously increase entropy and reach a limit as the temperature reaches 0 K at which point all molecular motion will cease and so will the life of the universe.

Answer:

hypothesis on the ultimate fate of the universe, which suggests the universe would evolve to a state of no thermodynamic free energy and would therefore be unable to sustain processes that increase entropy.

Explanation:

Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.

the maximum quantity of a substance that will dissolve in a certain quantity of water at a specified temperature.

From the Solubility Graph of NaCl , we can see that the solubility of NaCl at 10 C is around 36.5gm/L.

If it is cooled down to saturation we will see the precipitate forming and that will be equal to the difference of solute present and the solubility.

As it is given that 50gm of solute is present

The precipitate will be 50- 36.5 gm, = 13.5 gm.

Therefore Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.

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Answer:

bottom :)

Explanation:

Question: How Many Protons, Neutrons, And Electrons Are In A Neutral Atom Of Copper, Cu, With An Atomic Number Of 29 And Mass Number Of 64? A. Protons = 64, Neutrons = 29, Electrons = 29 B. Protons = 35, Neutrons = 29, Electrons = 35 C.

Answer:

5.158 mol/L

Explanation:

To find the molarity, you need to use the formula:

Molarity (M) = moles / volume (L)

You have been grams sodium carbonate. You need to (1) convert grams Na₂CO₃ to moles (via molar mass), then (2) convert moles Na₂CO₃ to moles HCl (via mole-to-mole ratio from equation), then (3) convert mL to L (by dividing by 1,000), and then (4) use the molarity equation.

Steps 1 - 2:

2 HCl + 1 Na₂CO₃ ----> 2 NaCl + H₂O + CO₂

6.5287 g Na₂CO₃         1 mole            2 moles HCl
--------------------------  x  -------------  x  -------------------------  =  0.12318 mole HCl
                                      106 g           1 mole Na₂CO₃

Step 3:

23.88 mL / 1,000 = 0.02388 L

Step 4:

Molarity = moles / volume

Molarity = 0.12318 mole / 0.02388 L

Molarity = 5.158 mole/L

**mole/L is equal to M**

Answer:

2.77g of [tex]AlCl_{3}[/tex] can be produced.

Explanation:

Use stoichiometry.

Balanced equation: [tex]3Al + 3NH_{4} ClO_{4}[/tex] ⇒ [tex]Al_{2} O_{3} + AlCl_{3} +3NO + 6H_{2} O[/tex]

[tex]NH_{4} ClO_{4} : AlCl_{3}[/tex]

      3        :     1                        **[tex]n=\frac{m}{M}[/tex]

 0.0623**   :    [tex]x[/tex]                        [tex]n=\frac{7.32}{117.49}[/tex]   = 0.0623

      [tex]3x=0.0623\\x=0.020767[/tex]

[tex]n=\frac{m}{M}[/tex]    

[tex]m=nM[/tex]

m= (0.020767)(133.34)

m= 2.77g                                  

Answer:

3-methyl pentane

Explanation:

The longest chain of carbons is 5, so it will have the prefix pent-.

The first branch is on the 3rd carbon, and it is a 1 carbon branch. This means the branch will be called 3-methyl.

Now to find the suffix we need to count the carbons and the hydrogens. There are 6 carbons and 14 hydrogens, which follows the formula for an alkane ([tex]C{_n}H{_{n+2}}[/tex]). This gives it the suffix -ane.

Now we can name the compound:

3-methyl pentane

That is the answer

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Oil drop on waxed paper is less dispersed since it has non-polar interactions therefore occurs circular in shape.

Polar interactions are the strong and long-range interactions between molecules that are based on electrostatic attraction.

In this case, the shape of this drop with the shape of the water drop on the waxed paper is that the oil drop on waxed paper is less dispersed since it has non-polar interactions

Also, oil and water do not have any interactions so the oil drop is more dispersed and occurs to be oval in shape.

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Answer:

O2 is limiting reactant

Explanation:

4 x Al = 107.924 gm

6 x O  = 95.994  gm

     you need ALMOST as many grams of O2 as Aluminum....

          you are short of O2  <======the limiting reactant

The atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.

The total distance from the nucleus of an atom to the outermost orbital of its electron is known as its atomic radii or atomic radius.

As we go down the group, the number of orbits or shell increases.

Hence, atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.

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[tex]~~~~~\text{pH} + \text{pOH} = 14\\\\\implies \text{pOH} = 14- \text{pH}\\\\\implies \text{pOH} = 14 - 11.8\\\\\implies \text{pOH} = 2.2\\\\\text{Now,}\\\\~~~~~~~\text{pOH}= -\log\left[\text{OH}^{-1}\right]\\\\\implies \left[\text{OH}^{-1} \right] = 10^{-\text{pOH}} = 10^{-2.2}~ = 0.006309~M\\\\\text{Hence the concentration of OG}^{-1}~ \text{is 0.006309~M}[/tex]

Answer:

C

Explanation:

Because NH3 has 8 valence electrons, and Hydrogen can only have 1 bond

The statements which best describe beta decay are: option 1, 2 and 4.

A beta particle can be defined as an isotope which typically undergoes radioactive decay through the emission of a radiation with a -1 charge.

Based on scientific information and records from radioactivity, we can infer that the statements which best describe beta decay are:

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Answer:

1,2,4

Explanation:

Answer:

What happens when a piece of hot metal is dropped in room temperature water. Over time the metal will cool and the water will heat up. Eventually the two objects will have the same temperature. They are then said to be in thermal equilibrium with one another.

Explanation:

i hope this helps you!!

The strategy for balancing the equations is by looking at the number of atoms on each side of the equation and adding coefficients to the molecules.

A balanced equation is an equation for a chemical reaction where the number of atoms for each element in the reaction and the total charge is the same for the reactants and the products,

A strategy that will help balance equations more quickly is balancing by inspection. Here, you look at how many atoms you have on each side of the equation and add coefficients to the molecules to balance out the number of atoms.

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Cyclohexenone is a useful starting material for drug synthesis. For each reaction. The major additional product for the reactions are respectively given as;

This is further explained below.

Generally, An electrophile is simply defined as a species of a chemical compound that may receive an electron pair from a carbonyl group in order to establish chemical bonds.

In conclusion, It is common practice to add 1,4 significance to the alkene of asymmetric nucleophiles when using organocuprate reagents in the process at the top.

Grignard reagents often add 1,2 to the carbonyl of asymmetric carbonyl compounds in the bottom reaction

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Cyclohexenone is a useful starting material for drug synthesis. For each reaction. The major additional product for the reactions are respectively given as;

A soft electrophile

A hard electrophile

Generally, An electrophile is simply defined as a species of a chemical compound that may receive an electron pair from a carbonyl group in order to establish chemical bonds.

In conclusion, It is common practice to add 1,4 significance to the alkene of asymmetric nucleophiles when using organocuprate reagents in the process at the top.

Grignard reagents often add 1,2 to the carbonyl of asymmetric carbonyl compounds in the bottom reaction

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The density of the liquid in the bottle will be 0.665 g/mL

Mathematically, density is given as:

Density = mass/volume

Mass of liquid = mass of bottle + liquid - mass of empty bottle

                       = 6.3 - 4.24 = 2.06 g

volume of liquid = 3.100 mL

Density of liquid = 2.06/3.100 = 0.665 g/mL

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Answer:

2-methylbutane

Explanation:

First, you want to identify the largest number of sequential carbons. In this case, the parent chain is made up of 4 carbons. This makes the base name, butane.

Next, you want to identify any branches. There is a branch made up of 1 carbon, and these are referred to as a methyl group. The lowest possible carbon on the parent chain this branch is attached to is the second carbon.

When you put these factors together, you are left with the name: 2-methylbutane.

Molarity=Moles of solute/Volume of solution in L

So

Mads of Iodine

An engineer's solution to a problem would involve designing shatter-resistant windows for a car.

An engineer is a person who applies the knowledge of science to design tools and equipment which are used to solve the problems facing man.

An engineer specializes in the scientific field of engineering.

Some tools or devices produced by engineers are machines and vehicles such as cars and aeroplanes.

Therefore, an engineer's solution to a problem would involve designing shatter-resistant windows for a car.

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Taking into account the reaction stoichiometry, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.

In first place, the balanced reaction is:

CaO + H₂O → Ca(OH)₂

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 stoichiometric reaction 1 mole of Ca(OH)₂ is produced by 1 mole of CaO, 2 moles of Ca(OH)₂ are produced by how many moles of CaO?

[tex]moles of CaO=\frac{2 moles of Ca(OH)_{2}x1 mol of CaO }{1 mole of Ca(OH)_{2}}[/tex]

moles of CaO= 2 moles

Finally, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.

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Answer:

See below ~

Explanation:

The respective pairs are :

× Ribose ⇒ The sugar of RNA

× Double helix ⇒ Structures of DNA

× Watson & Crick ⇒ Proposed the double helix model

× Base pair ⇒ Adenine - Thymine pair

× Cytosine ⇒ The nucleotide pair of Guanine

The amount, in mL, of the concentrated acid required, would be 1.1875 mL

From the dilution equation:

m1v1=m2v2 where m1 and m2 = molarity before and after dilution, and v1 and v2 = volume before and after dilution.

m2 = 0.285M, m1 = 12.0M v2 = 50.0 mL

v1 = m2v2/m1 = 0.285x50/12 = 1.1875 mL

Thus, 1.1875 mL of the acid would be taken and diluted with water up to the 50 mL mark.

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Kinetic energy in different forms occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.

Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.

Kinetic energy (water) to electric energy (dam) as the hydroelectric dam works.

Then, as the current travels from the plant to your crib, electric energy to heat energy (wire resistance).

Then, when you are using the dryer electric energy to heat energy (hot air) and sound energy (air particles vibrate due to the heat energy).

Therefore, Kinetic energy in different forms occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.

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Answer: (2)

Explanation:

There are 16 oxygen atoms on the reactant side but only 10 on the products side.

Answer:

d the average kinetic energy of the particles

Linking monomers together to form a polymer .This chemical reaction also forms water molecules.

This is a type of reaction which involves the linking of two or more monomers to form a polymer.

Dehydration reaction forms water molecules as part of the product thereby making it the most appropriate choice.

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