the atomic number of an element is......

Answer:

Empirical formula is C₂H₆O.

Explanation:

Empirical formula:

It is the simplest formula gives the ratio of atoms of different elements in small whole number

Given data:

Percentage of hydrogen = 13.3%

Percentage of carbon = 52.0%

Percentage of oxygen = 34.7%

Empirical formula = ?

Molecular formula = ?

Solution:

Number of gram atoms of H = 13.3 / 1.01 = 13 .17

Number of gram atoms of O = 34.7 / 16 = 2.17

Number of gram atoms of C = 52.0 / 12 = 4.3

Atomic ratio:

            C                     :          H             :           O

           4.3/2.17            :     13.17/2.17     :       2.17/2.17

            2                      :        6               :        1

C : H : O = 2 : 6 : 1

Empirical formula is C₂H₆O.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

n = 46 / 158

The relative molecular mass of compound is not correct.

Answer:

In the middle of every atom is the nucleus. The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. D. No Charge

Explanation:

Answer:

C & D

Explanation:

Just took quiz and got it right! Hope this helps! <3

Answer:

cow, sheep, goats, deer, elk

Answer:

paper chromatography is an analytical method used to separate colored chemicals or substances.It is primarily used as a teaching tool,having been replaced by other Chromatography methods ,such as thin layer chromatography.

Answer:

Wait so what is the answer, before any one says any thing I knw this is Not a question so plz don't say nothing about it.

Explanation:

Particles in a solid are closer than they are in a liquid or gas which are farther apart. Conduction involves the collision of particles in more dense materials.For example, solids conduct thermal energy faster than liquids or gases because the particles are closer and collide frequently.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

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the answer is  photosynthesis

Answer:

It’s b

Explanation:

I just did it on usatestprep

The valence electrons are shared between both atoms in covalent bonding while the valence electrons are completely transferred in ionic bonding. Hence, option B is correct.

A chemical bond is what holds atoms together in molecules.

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

In the given diagram covalent bond is taking place.

Hence, option B is correct.

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Answer:

to validate the law of conservation of mass as total no. of reactants must be equal to the total no. of products

Answer:

Active Transport

Explanation:

In cellular biology, active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.

Answer:

active

Explanation:

i got it right

Answer:

See explanation

Explanation:

Two structures are pictured in the image attached, structure 2 is a more stable structure for TeF₄ or TeCl₄ since the lone pair in the structure is present at an equatorial position. Note that the structure of the compound is based on a trigonal bipyramid but of the structure type AX4E, where the lone pair could be positioned at axial or equatorial positions as shown in the images attached.

As a result of repulsion between electron pairs, the bond distance between Te - X(axial) is greater than Te-X (equatorial). This implies that the Te - X(axial) bonds are longer than Te - X(equatorial) bonds.

In answering the question, we must take cognisance of the fact fluorine is more electronegative than chlorine. This implies that fluorine will draw more electron density towards itself than chlorine and this shortens the bond length.

The structures of the both compounds are based on a trigonal bipyramid with a bond angle of 90° for axial position and 120° for the equatorial position.

Owing to the greater electo negativity of fluorine, both the fluorine F-axial and F-equatorial bonds of TeF4 are shorter than the Cl-axial and Cl-equatorial bonds of TeCl4. Hence the axial and equatorial angles in TeF4 are smaller than the axial and equatorial bond angles in TeCl4 due to the greater electro negativity of the fluorine atom.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of liquid = 53 mL

density = 2.12 g/mL

We have

mass = 2.12 × 53

We have the final answer as

Hope this helps you

Answer:

Explanation:

In order to find the volume when the pressure is changed to 5.30 atm we use Boyle's law which is

[tex]P_1V_1 = P_2V_2 \\[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\ [/tex]

From the question

P1 = 2.82 atm

V1 = 1.79 L

P2 = 5.30 atm

So we have

[tex]V_2 = \frac{2.82 \times 1.79}{5.3} \\ = 0.9524150943...[/tex]

We have the final answer as

Hope this helps you

Answer:

21

Explanation:

Formula;

Mass number = number of protons + number of neutrons

= 9 + 12

= 21

Answer: A. Protons

Explanation:

Answer:

a. molarity

e. molality

h. density

b. weight percent

g. volume percent

Explanation:

Molarity is defined as the number of moles of substance dissolved in per  liter of solution (moles/Liter). It is also called molar concentration of the solution.

Molality is defined as the number of moles of substance dissolved in one kg or kilogram of solvent and its SI unit is mol/kg.

Density is defined as the mass divided by its volume.

density =mass/volume

Weight percent is defined as the division of mass of a solute to the mass of the total solution, multiplied by 100. To calculate the weight percent or mass percent, both mass of a solute and the mass of a solution is required to express the concentration of a solution.

Volume percent is defined as the ratio of the volume of the solute to the volume of the total solution multiplied by 100.

Answer:

1.11 M

Explanation:

M₁V₁ = M₂V₂

Step 1: Define

Molarity₁ = 2.50 M

Volume₁ = 0.890 L

Molarity₂ = unknown

Volume₂ = 2.00 L

Step 2: Substitute and Evaluate for M₂

(2.50 M)(0.890 L) = (M₂)(2.00 L)

2.225 = M₂(2.00 L)

M₂ = 1.1125 M

Step 3: Simplify

We are given 3 sig figs.

1.1125 M ≈ 1.11 M

Answer:

Option e is correct

The heat required to increase the temperature of copper metal by 1 degree is 0.754 j .

Explanation:

Given data:

specific heat of copper = 0.377 j/g.°C

Heat required to increase temperature = ?

Mass of copper = 2.00 g

Change in temperature = 1°C

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Q = m.c. ΔT

Q = 2 g× 0.377 j/g.°C × 1°C

Q = 0.754 j

The heat required to increase the temperature of copper metal by 1 degree is 0.754 j .

Answer:

The wavelength of wave is 0.33 ×10²⁰ m.

Explanation:

Given data:

Frequency of wave = 9.12×10⁻¹² Hz

Wavelength of wave = ?

Solution:

Formula:

Speed of light = wavelength × frequency

c = λ × f

λ = c/f

This formula shows that both are inversely related to each other.

The speed of light is 3×10⁸ m/s

Frequency is taken in Hz.

It is the number of oscillations, wave of light make in one second.

Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.

Now we will put the values in formula.

λ = 3×10⁸ m/s  / 9.12×10⁻¹² Hz

Hz = s⁻¹

λ = 0.33 ×10²⁰ m  

The wavelength of radiation is 0.33 ×10²⁰ m  .

Incomplete question. I inferred you want the term that fits this definition.

Answer:

A Worldview

Explanation:

Having a Worldview refers to an individual's perception or the way one thinks about the world, influenced by their attitudes and values.

This view of the world is made up of a person's views and beliefs which form their expectations about the world in which they live.

Answer:

It has 32 neutrons

Explanation:

Answer:

A polar molecule does not have an even distribution of electrons. ... Therefore Chloroform is a polar molecule because it does not have an even distribution of molecules, and one end is more negatively charged (Cl) than another (H).

Explanation:

Answer : The mass percent of Al in the alloy is 85.9 %.

Explanation : Given,

Mass of sample of an alloy  = 1.1181 g

Mass of [tex]H_2[/tex] = 0.1068 g

Molar mass of [tex]H_2[/tex] = 2 g/mol

Molar mass of [tex]Al[/tex] = 27 g/mol

First we have to calculate the moles of [tex]H_2[/tex].

[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]

[tex]\text{Moles of }H_2=\frac{0.1068g}{2g/mol}=0.0534mol[/tex]

Now we have to calculate the moles of [tex]Al[/tex]

The balanced chemical equation is:

[tex]2Al+2NaOH+6H_2O\rightarrow 2Na[Al(OH)_4]+3H_2[/tex]

From the reaction, we conclude that

As, 3 moles of [tex]H_2[/tex] produced from 2 moles of [tex]Al[/tex]

So, 0.0534 mole of [tex]H_2[/tex] produced from [tex]\frac{2}{3}\times 0.0534=0.0356[/tex] mole of [tex]CaCl_2[/tex]

Now we have to calculate the mass of [tex]Al[/tex]

[tex]\text{ Mass of }Al=\text{ Moles of }Al\times \text{ Molar mass of }Al[/tex]

[tex]\text{ Mass of }Al=(0.0356moles)\times (27g/mole)=0.9612g[/tex]

Now we have to calculate the mass percent of Al in the alloy.

Mass percent of Al in alloy = [tex]\frac{\text{Mass of Al}}{\text{Mass of sample of an alloy}}\times 100[/tex]

Mass percent of Al in alloy = [tex]\frac{0.9612g}{1.1181g}\times 100[/tex]

Mass percent of Al in alloy = 85.9%

Therefore, the mass percent of Al in the alloy is 85.9 %.

Answer:

The right answer is A, "Change of matter."

Explanation:

The formation of gas, color change,  and precipitate forming are the 3 main chemical changes that are evidence of a new substance being produced. A change of matter is not. Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties.

Answer:

[tex]C_{26}[/tex][tex]H_{21}[/tex][tex]O_{10}[/tex]

Explanation:

We are given the following percentages:

Carbon ------ 62.4%

Hydrogen ------------ 4.19%

Oxygen ---------------- 33.2%

Now, let's take a 100g sample of this compound

since percentages are calculated out of 100, you will notice that the mass of the elements in the sample is the same as their percent composition

So we have:

Carbon -------- 62.4 grams

Hydrogen ----------- 4.19 grams

Oxygen ------------ 33.2 grams

With this information, we can calculate the number of moles of the respective elements in the given compound

Moles of Carbon (mass = 12u):

Given mass / Molar mass = 62.4 / 12 = 5.2 moles

Moles of Hydrogen (mass = 1u):

Given mass / Molar mass = 4.19 / 1 = 4.2 moles (approx)

Moles of oxygen (mass = 16u):

Given mass / Molar mass = 33.2 / 16 = 2 moles

The ratio of moles of the respective elements in our compound:

(Moles of Carbon)  :    (Moles of Hydrogen)   :  (Moles of Oxygen)

5.2   :     4.2   :    2

Which can be written as:    [tex]C_{5.12} H_{4.2} O_{2}[/tex]

We are almost done but there is one problem, the formulas of compounds we see have whole numbers and not decimals

So, we will multiply all 3 of the numbers by the smallest number possible to get whole number ratios

Since there are 2 numbers we need to take care of and both of them have 2 in the decimal place,

we can multiply by 5 to get whole number ratios

So we get:

26   :    21   :    10

Therefore the molecular formula of the compound:

[tex]C_{26}H_{21}O_{10}[/tex]

Answer:

The concentration of bromic acid (HBrO₃) is 0.069 moles/L

the concentration of hydrofluoric acid (HF) is 0.345 moles/L

Explanation:

(a) The balanced chemical equation for the reaction is

BrF₅ + 3H₂O → HBrO₃ + 5HF

The chemical equation is balanced

(b) To determine the concentration of each acids,

First, we will determine the different volume of the acids yielded

The solution volume is 783 mL = 0.783 L

From the balanced chemical equation,

1 mole of BrF₅ produces 1 mole of HBrO₃

Likewise, 1 mole of BrF₅ will produce 5 moles of HF

From the question,

5.40×10⁻² moles of bromine pentafluoride (BrF₅) reacted;

Hence, 5.40×10⁻² moles of HBrO₃ will be produced

and 5 × 5.40×10⁻² moles of HF will be produced.

Number of moles of HBrO₃ produced = 5.40×10⁻² moles

and Number of moles of HF produced = 2.7 × 10⁻¹ moles

From the formula,

Number of moles (n) = Concentration (C) × Volume (V)

Then,

Concentration (C) = Number of moles (n) / Volume (V)

For bromic acid (HBrO₃)

n = 5.40×10⁻² moles

Volume = 0.783L

Hence,

C = 5.40×10⁻² moles / 0.783L

C = 0.069 moles/L

This is the concentration of bromic acid (HBrO₃)

For hydrofluoric acid (HF)

n = 2.7 × 10⁻¹ moles

V = 0.783L

Hence,

C = 2.7 × 10⁻¹ moles / 0.783L

C = 0.345 moles/L

This is the concentration of hydrofluoric acid (HF)

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 0.5 g/cm³

1 mL = 1 cm³

5 mL = 5 cm³

volume = 5 cm³

The mass is

mass = 0.5 × 5

We have the final answer as

Hope this helps you

Answer:

1. Cells contain DNA that is passed cell to cell during cell divison.

2. Cells are similiar in chemical composition and reactions that maintin homeostasis.

3. All basic chemical and physiological functions are carried out inside the cell.

4. Cell activity depends on the oragnelles withen the cell.

Hope this helps!

Answer:

No

Explanation:

The solubility of a solid in water refers to the amount of that solid that dissolves in water.

It is not possible to calculate the solubility of the solid because the student threw away the first precipitate that formed. We already have the volume of water, but having lost some mass of precipitate, it has become impossible to accurately determine the solubility.

Hence the answer provided above.