1. Isotopes of the same element vary in
the number of
present in the
nucleus.
A.neutrons
B.protons
C.electrons

Answer:

164g

Explanation:

3×23+31+16×4

≈69+31+64

≈164.0 g

The molar mass of sodium phosphate, [tex]\rm Na_3PO_4[/tex] is 163.94 g/mol. The correct answer is option C.

Molar mass of a compound is the sum of atomic mass of each atom present in the molecule.

The molar mass of sodium phosphate, [tex]\rm Na_3PO_4[/tex], can be calculated by adding the atomic masses of the constituent atoms.

The atomic masses of sodium (Na), phosphorus (P), and oxygen (O) are 23 g/mol, 31 g/mol, and 16 g/mol, respectively.

Therefore, the molar mass of one molecule of sodium phosphate is:

= 3(Na) + 1(P) + 4(O)

= [tex]\rm (3 \times 23\ g/mol) + 31\ g/mol + (4 \times 16 \ g/mol)[/tex]

= 164.0 g/mol

Therefore, the molar mass of sodium phosphate ([tex]\rm Na_3PO_4[/tex]) is option C. 163.94 g/mol.

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Answer:

2Sb^(+3) (aq) + 3S^(-2) (aq) = Sb_2•S_3

Explanation:

First of all, let us balance the equation to give;

2Sb(OH)3 (s) + 3Na2S (aq) = Sb2S3 + 3NaOH

Now, we can observe the presence of positive Sodium ions (Na+) and negative hydroxyl ions (OH-) on both left and right sides of the equation.

Now, the two ions will cancel out. These ions are not really involved in the overall reaction and thus do not require being written in the overall equation. Hence, the overall net ionic reaction can now be written as:

2Sb^(+3) (aq) + 3S^(-2) (aq) = Sb_2•S_3

Answer:

58.44 g of NaCl are needed.

Explanation:

Given data:

Mass of NaCl needed = ?

Volume of solution = 200 mL (200/1000 =0.2 L)

Molarity of solution = 5 M

Solution:

We will solve this problem through molarity formula.

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Now we will put the values.

5 M = moles of solute / 0.2 L

Moles of solute = 5 mol/L × 0.2 L

Moles of solute = 1 mol

Mass of sodium chloride:

Mass = number of moles × molar mass

Mass = 1 mol × 58.44 g/mol

Mass = 58.44 g

Thus, 58.44 g of NaCl needed.

Answer:

The wavelength of these photons will become longer. The energy of each of these photons will become lower.

Explanation:

Light can be considered as electromagnetic waves. The wavelength of a wave is equal to the minimum distance between two troughs (lowest points) in this wave. On the other hand, the frequency of a wave is equal to the number of wavelengths that this wave travels in unit time.

Assume that the speed of light stays the same. The distance that this beam of light travels in unit time will be the same. However, with a lower frequency, there would be fewer wavelengths in that same distance. Therefore, the size of each wavelength will become longer.

If [tex]c[/tex] represent the speed of light and [tex]f[/tex] represents the frequency, then the wavelength would be:

[tex]\displaystyle \lambda = \frac{c}{f}[/tex].

The energy [tex]E[/tex] of each proton of a beam of light is proportional to the frequency [tex]f[/tex] of the light. Let [tex]h[/tex] denote Planck's Constant. The numerical relation between [tex]E\![/tex] and [tex]f\![/tex] would be:

[tex]E = h\, f[/tex].

Therefore, if the frequency [tex]f[/tex] of this light becomes smaller, the energy [tex]E[/tex] of each of its proton will also become proportionally lower.

Answer:

4.254g

Explanation:

Explanation:

Actual yeild is equal 75.1% of the theoretical yeild

(75.1/100)×3.12

= 2.34312

approximately = 2.34 g.

Answer:

See image attached

Explanation:

a)

The full reaction mechanism of step 1 was obtained from Bartleby and attached to this answer. The steps involved in the reaction are:

1) Loss of Br- and formation of a carbocation

2) Attack of CH3CN on the carbocation

4) Formation of a quaternary nitrogen intermediate

5) Attack of water on the quaternary nitrogen intermediate

6) Loss of the water molecule

5) Formation of the amide product

b)

i) sodium hydroxide

ii) HCl

Answer: Filled and half filled orbitals are stable

Answer:

Silver phosphate or silver orthophosphate is a light sensitive, yellow, water-insoluble chemical compound composed of silver and phosphate ions of formula Ag3PO4.

Chemical formula: Ag3PO4

Molar mass: 418.574 g/mol

Solubility in water: 0.00065 g/100 mL

Crystal structure: cubic

Explanation:

Answer:

Yes

Explanation:

A molecular compound is that one which is composed of molecules formed by atoms of two or different elements. A pentacosane is an alkaline made of unbranched chain of 25 carbons atoms. It has applications in plant metabolite. The molecular formula of pentacosane is C₂₅H₅₂

Yes, pentacosane is a molecular compound.

A molecular compound is formed when two or more nonmetal atoms bond together by sharing electrons. In the case of pentacosane, it is composed of carbon and hydrogen atoms bonded together in a specific arrangement.

Pentacosane has the chemical formula C25H52, indicating that it consists of 25 carbon atoms and 52 hydrogen atoms. The carbon and hydrogen atoms in pentacosane form covalent bonds by sharing electrons.

Each carbon atom in pentacosane is bonded to four other atoms, either carbon or hydrogen. This creates a long chain of carbon atoms with hydrogen atoms attached to them.

Molecular compounds, such as pentacosane, are typically nonpolar, meaning they do not have a positive or negative charge. This is because the electronegativity of carbon and hydrogen is similar, resulting in an even sharing of electrons in the covalent bonds.

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Answer:

just read the explanation.

Explanation:

1.Maintaining a healthy, perennial plant cover.

2.Mulching.

3.Planting a cover crop – such as winter rye in vegetable gardens.

4.Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.

Hope this helps. :)

The correct answer is B: Temperature and activation energy are the factors that affect the rate constant according to the Arrhenius equation.

According to the Arrhenius equation, which describes the relationship between the rate constant (k) of a chemical reaction and temperature, changing the factors of temperature and activation energy will affect the rate constant.

The Arrhenius equation is given by:

k = A * e^(-Ea/RT),

where k is the rate constant, A is the pre-exponential factor or the frequency factor, Ea is the activation energy, R is the ideal gas constant, T is the temperature in Kelvin, and e is the base of the natural logarithm.

From the equation, it is evident that the rate constant is directly influenced by temperature and activation energy. Increasing the temperature results in a higher rate constant, as the exponential term in the equation becomes larger. This is because higher temperatures provide more kinetic energy to the reacting molecules, leading to more frequent successful collisions and increased reaction rates.

Similarly, the activation energy affects the rate constant. A higher activation energy results in a lower rate constant, as the exponential term becomes smaller. Activation energy represents the energy barrier that reactant molecules must overcome to form products. A higher activation energy implies a slower reaction rate. option(B)

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Answer:

liquid

Explanation:

because when you see the particles inside of it, there are going to be less particles than a solid because there are more compact particles together

A. Chloroplasts

B. The cell wall and the vacuole

C. Vacuoles

D. The mitochondrion

The given blanks are filled with chlorophyll, cell wall and vacuole, chloroplasts, and mitochondria.  

• By the process of photosynthesis, the organisms, which comprises the pigment chlorophyll, this pigment convert the energy from the light into the chemical energy that can be stored in the form of sugars.  

• The cell wall and the vacuoles present in the cells of plants helps it to maintain shape and integrity.  

• The organelle within the plant, that is, chloroplasts works to store pigments and food. It stores pigment, that is, chlorophyll that converts light energy into the usable chemical energy.  

• The mitochondria by the process of cellular respiration converts the food into the usable form of energy. The mitochondria are found in all the plants and animals and are considered as converters.  

Thus, the correct answer of A is chlorophyll, B is cell wall and vacuole, C is chloroplasts, and D is mitochondria.  

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Answer:

Gt

Explanation:

The partial pressure of [tex]N_2[/tex]is 165.6 kPa and the partial pressure of [tex]H_2[/tex]is 434.4 kPa.

To calculate the partial pressures of [tex]H_2[/tex]and [tex]N_2[/tex]in the 10dmcube container, we need to use the ideal gas law equation, which states that the pressure of a gas is directly proportional to its number of moles and temperature, and inversely proportional to its volume.

First, we need to calculate the number of moles for each gas. Since we are given the volume of each gas and the volume of the container, we can use the formula:

Number of moles = Volume / Molar volume

The molar volume is the volume occupied by one mole of a gas at a given temperature and pressure. At standard temperature and pressure (STP), the molar volume is 22.4 L/mol.

For [tex]N_2[/tex], the number of moles is 2 dmcube / 22.4 L/mol = 0.089 mol
For [tex]H_2[/tex], the number of moles is 5 dmcube / 22.4 L/mol = 0.223 mol

Next, we can calculate the partial pressures of each gas using the formula:

Partial pressure = (Number of moles / Total number of moles) * Total pressure

The total pressure is the sum of the pressures of each gas:

Total pressure = Pressure of N2 + Pressure of [tex]H_2[/tex]

Given that the pressure of N2 is 100 kPa and the pressure of [tex]H_2[/tex]is 500 kPa, we have:

Total pressure = 100 kPa + 500 kPa = 600 kPa

Now we can calculate the partial pressure of [tex]N_2[/tex]:

Partial pressure of [tex]N_2[/tex]= (0.089 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 165.6 kPa

Similarly, we can calculate the partial pressure of [tex]H_2[/tex]:

Partial pressure of H2 = (0.223 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 434.4 kPa

Therefore, the partial pressure of [tex]N_2[/tex]is 165.6 kPa and the partial pressure of [tex]H_2[/tex]is 434.4 kPa.

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Answer:

But its only 5 points, not 10

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 100 g

volume = 20 mL

So we have

[tex]density = \frac{100}{20} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

electron revolving in a shell is associated with a definite amount of energy. The energy changes when it jumps to another shell that is so say when it goes from one level of energy level to another. Thus shell also gives the energy of a electron besides its location and are therefore called energy levels.

Answer:

Sodium has a strong affinity for water and reacts violently with water to produce hydrogen gas. Since hydrogen is highly combustible, it will immediately catch fire. As a result, the fire will spread instead of getting extinguished.    ok

Explanation:

Explanation:

The correct formula for calcium fluoride is CaF2 (with two fluoride ions per calcium ion). Therefore, 2.25 moles of CaF2 contains:

- 2.25 moles of Ca2+ ions (since there is one calcium ion for every molecule of CaF2)

- 2 x 2.25 = 4.50 moles of F- ions (since there are two fluoride ions for every molecule of CaF2)

So, in total, 2.25 moles of CaF2 contains 2.25 moles of Ca2+ ions and 4.50 moles of F- ions.

Answer:

3 × 10²⁰ molecules C₉H₃O₄

Explanation:

Step 1: Define

Avagadro's Number: 6.02 × 10²³ atoms, molecules, formula units, etc.

Molar Mass C - 12.01 g/mol

Molar Mass H - 1.01 g/mol

Molar Mass O - 16.00 g/mol

Molar Mass C₉H₃O₄ - 175.12 g/mol

Step 2: Use Dimensional Analysis

[tex]0.1 \hspace{3} g \hspace{3} C_9H_3O_4(\frac{1 \hspace{3} mol \hspace{3} C_9H_3O_4}{175.12 \hspace{3} g \hspace{3} C_9H_3O_4} )(\frac{6.02(10)^{23} \hspace{3} molecules \hspace{3} C_9H_3O_4}{1 \hspace{3} mol \hspace{3} C_9H_3O_4} )[/tex] = 3.43764 × 10²⁰ molecules C₉H₃O₄

Step 3: Simplify

We are give 1 sig fig.

3.43764 × 10²⁰ molecules C₉H₃O₄ ≈ 3 × 10²⁰ molecules C₉H₃O₄

Answer:

98g

Explanation:

h=1*2=2

s=32

0=16*4=64

64+32+2=98

Answer:

i think its a mixture because it has different things mixed with it like chocolate, marshmallows and other stuff

Explanation:

Answer:

D

Explanation:

Protons have pretty much nothing to do with reactions, but electrons affect reactions because that is how elements bond. A neutral sodium atom has 11 electrons while a neutral neon atom has 10 electrons, meaning D is correct.

Sodium is more likely to react with another element than an element such as neon because sodium has one more electron than neon. Thus, option D is correct.

Silver is a shiny metal that conducts electricity very well. It can be molded into thin sheets it means it can spread into a like a sheet and these type of properties is known as malleability.

Potassium is dull and brittle it means that it can't be change into sheet when you try to change in sheet it will break and these properties are called as brittlness and when it is has been dissolved into water, which it does quite easily. Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting points and boiling points.

Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6. The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .

Therefore,Sodium is more likely to react with another element than an element such as neon because sodium has one more electron than neon. Thus, option D is correct.

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Explanation:

2 V2O5 --> 4 V + 5 O2

from the formula, you know that

2 mol V2O5 give 5 mol O2

then 5.50 mol V2O5 will give

(2 mol V2O5)/(5 mol O2)=(5.50 mol V2O5)/(x mol O2)

(x mol O2)=(5.50 mol V2O5)×(5 mol O2)/(2 mol V2O5)

x mol O2 = 13.75

(16×2)g o2 / 1 mol o2 = x g o2 / 13.75 mol o2

32g o2 × 13.75 mol o2 / 1 mol o2 = x g o2 = 440g o2

hope it was helpful!

Answer:

I could help but I don't understand the question

Explanation: