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Question 5 options:

Oxygen


Calcium


Boron


Neon

Answer:

Explanation:

In an acid-catalyzed epoxide ring-opening reaction, there is a formation of two intermediate in the reaction. The first stage involves the protonation of oxygen in the epoxide. The stage is followed by the attraction of water molecules onto the more substituted carbon atom in the epoxide ring. The stepwise reaction mechanism can be seen in the image attached below.

Answer:

29.7g of NO are present

Explanation:

With volume, absolute temperature and pressure we can determine moles of ammonia and oxygen that reacts. With these moles we can determine limiting reactant and moles (And mass) of nitrogen monoxide produced as follows:

Moles Ammonia:

PV = nRT

PV/RT = n

1.26atm*33.7L / 0.082atmL/molK*296.3K = 1.748 moles ammonia

Moles Oxygem:

PV = nRT

PV/RT = n

1.26atm*41.3L / 0.082atmL/molK*296.3K = 2.142 moles oxygen

Based on the chemical reaction, 1 mole of NH3 reacts per mole of O2 producing 1 mole of NO.

Thus, limiting reactant is ammonia and moles of NO produced are = Moles of ammonia added = 1.748mol NH3

Mass Ammonia:

1.748mol NH3 * (17g/mol) =

Answer:

The heat energy required to boil 94.15 g of ethanol is 77.7679 kJ.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three.

If the relationship between the magnitudes is direct, the following formula must be followed:

a ⇒ b

c ⇒ x

Then: [tex]x=\frac{c*b}{a}[/tex]

It is called "heat of vaporization" to the energy necessary to change 1 gram of substance in solid state, to liquid state, without changing its temperature. In this case, the heat of vaporization of ethanol is 0.826 kJ / g, that is, 0.826 kJ of energy is required to change 1 gram of substance from solid state to liquid state. The thermal energy required to boil 94.15 g of ethanol can be calculated using the following rule of three: if 0.826 kJ is required to change 1 gram of ethanol, to change 94.15 grams, how much energy does it require?

[tex]energy=\frac{94.15 grams*0.826 kJ}{1 grams}[/tex]

energy= 77.7679 kJ

The heat energy required to boil 94.15 g of ethanol is 77.7679 kJ.

The heat energy in joules required to boil the ethanol is 77.77 kJ.

The given parameters;

The heat energy in joules required to boil the ethanol is calculated as follows;

[tex]Q = m\times \Delta H_{vap}[/tex]

Q = 94.15  x  0.826

Q = 77.77 kJ

Thus, the heat energy in joules required to boil the ethanol is 77.77 kJ.

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Answer:

D atom

Explanation:

The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms

Answer:

an insulator is right answer

Explanation:

i hope it is helpful for you

The new volume = 542.6 ml

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

V₁=591 ml

T₁=20+273=293 K

T₂=-4+273=269 K

[tex]\tt V_2=\dfrac{V_1.T_2}{T_1}\\\\V_2=\dfrac{591\times 269}{293}\\\\V_2=542.6~ml[/tex]

Electronic configuration of x will be1s² 2s² 2p⁶ 3s² 3p⁶ 4s² and electronic configuration of y will be 1s² 2s² 2p⁴.

Given,

Atomic number of x = 20

Atomic mass = 40

Atomic number of y = 8

Atomic mass of y= 16

Electronic configuration, sometimes referred to as electronic structure or electron configuration, is the arrangement of electrons in orbitals that surround an atomic nucleus.

A standardized notation is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital. For instance, the electronic structure of carbon, which has an atomic number of 6, is 1s² 2s² 2p².

So, According to the question-

As we already know that atomic number equals number of electrons.

Hence,

Electronic configuration of x = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Electronic configuration of y = 1s² 2s² 2p⁴

The given question is erroneous , the correct question should be-

Elements x and y are represented as x: atomic number 20, atomic mass 40 and y: atomic number 8 , atomic mass 16 for each of the elements write the electronic configuration using the s, p, d and f notations.

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Liquids have fixed volume but no fixed shape. ...

Liquids flow from higher to lower level.

Liquids have their boiling points above room temperature, under normal conditions.

Answer:

4.44 x 10^14 Hz

Explanation:

The frequency of light is 0.00148 Hz. This can be determined y using the value of wavelength.

It is defined as the reciprocal of the wavelength.

Frequency =  1 /  wavelength

Given:

Wavelength = 675 nm

To find:

Frequency=?

On subsituting the values:

f= 1/ 675 nm

f=0.00148 Hz

Thus, the frequency of light is 0.00148 Hz.

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The result of the calculation to the proper number of significant figures will be 31.6.

There are certain rules guiding significant figures in mathematical operations.

Following the first rule:

1.4 + 15 + 7.15 + 8.003 = 31.553

The participating number with the lowest significant digit after the decimal is 1.4 with just one significant digit. Thus, the final answer would be 31.6.

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The de Broglie wavelength of the bullet travelling at 1265 miles per having a mass of 6.45 g is 6.13 x 10⁻³³ m

De Broglie wavelength is the relation between the momentum and mass of an object. It is inversely proportional to its force. The de Broglie wavelength of an object is given by

                                                       λ = h

                                                             p

where,

λ = De Broglie wavelength

h = Planck's constant

p = momentum = mass x velocity

First, we will convert velocity fro miles per hour to m s⁻¹

Velocity = 1265 miles per hour

1 mile = 1.60 km

1265 x 1.60 = 2024

It is multiplied by     1       to convert into m s⁻¹

                            60 x 60

It gives = 16.86 m s⁻¹

Mass is converted from gram to kilogram

m = 6.45 g = 0.00645 kg or 6.45 x 10⁻³ kg

The momentum of bullet is p, which is

 p = mv

 p = 0.00645 kg x 16.86 m s ⁻¹

 p = 0.108 kgms⁻¹

λ = h

     p

where,

h is planck's constant = 6.63 x 10⁻³⁴ m²kg⁻¹

p is the momentum = 0.108 kgms⁻¹

λ is the de Broglie wavelength

putting the values,

λ = 6.63 x 10⁻³⁴ m²kg⁻¹

              0.108 kgms⁻¹

λ = 6.13 x 10⁻³³ m

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Answer:

5.2 × 10²² particles NaCl

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

5.0 g NaCl

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Na - 22.99 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol

Step 3: Convert

[tex]5.0 \ g \ NaCl(\frac{1 \ mol \ NaCl}{58.44 \ g \ NaCl} )(\frac{6.022 \cdot 10^{23} \ particles \ NaCl}{1 \ mol \ NaCl} )[/tex] = 5.15229 × 10²² particles NaCl

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

5.15229 × 10²² particles NaCl ≈ 5.2 × 10²² particles NaCl

Percentage error is defined as the difference between estimated value and the factual value in the comparison to the factual value and is expressed as a chance.

In other words, the percent error is the relative error multiplied by 100.

Formula of the percentage error :

δ = | actual value - expected value / expected value | × 100 %

Now,

Value obtained in the laboratory, actual value = 1.42 g/cm

Expected value of syrup, expected value = 1.37 g/cm

% error = 1.42 - 1.37 / 1.37 * 100 %

= 1.036 - 1 * 100 % { rounding off }

= 1.04 - 1 * 100 %

= 0.04 * 100 %

= 4 %

% Error = 4 %

Hence, the student % error is 4 % error

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Answer:

One atom of that element like helium neon and other Noble gases

Explanation:

Answer:

Explanation:

The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. An example is all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1.

Answer:

3.0 x 10²⁴molecules

Explanation:

Given parameters:

Number of moles of compound  = 5moles

Unknown:

Number of molecules  = ?

Solution:

A mole is substance that contains the Avogadro's number of particles;

   1 mole  = 6.02 x 10²³ molecules

   5 moles of the compound will give 5 x 6.02 x 10²³ molecules

                = 3.0 x 10²⁴molecules

The volume in cubic millimeters of a 3.54 carat diamond, given that the density of diamond is 3.51 g/mL is 0.202mL.

The volume of a substance can be calculated by dividing the mass by the density of the substance. The formula is as follows:

Volume = mass ÷ density

According to this question, a 3.54 carat diamond has a density of diamond is 3.51 g/mL. The volume is calculated as follows:

708 milligrams is equivalent to 0.708grams

Volume = 0.708g ÷ 3.51g/mL

Volume = 0.202mL

Therefore, the volume in cubic millimeters of a 3.54 carat diamond, given that the density of diamond is 3.51 g/mL is 0.202mL.

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The  the precipitate : Al(OH)₃(s)

The spectator ions : 3Cl⁻ and 3K⁺

Reaction

AlCl₃ + 3KOH → Al(OH)₃ + 3KCl

From solubility rules :

Compounds of OH− are insoluble except Compounds of Li +, Na +, K +, Rb +, Cs +, NH₄⁺ , Sr²⁺, and Ba²⁺

Compounds of Cl−, Br−, I− are soluble except Ag⁺, Hg₂²⁺, Pb²⁺

So the  the precipitate : Al(OH)₃(s)

net ionic reaction

AlCl₃ + 3KOH → Al(OH)₃ + 3KCl

Al³⁻+3Cl⁻+3K⁺+3OH⁻⇒Al(OH)₃(s)+3K⁺+3Cl⁻

Remove the spectator : 3Cl⁻ and 3K⁺

Al³⁻(aq)+3OH⁻(aq)⇒Al(OH)₃(s)

Answer:

superstition

Explanation:

Answer:

About 0.573g Cr

Explanation:

Answer:

-It is considered the modern atomic model.

-It describes the probable locations of the electrons

Explanation:

edge 2020

The correct answer is:

The electron cloud model is another name used to describe the modern wave mechanical model of the atom.

It is the atomic model introduced by Erwin Schrodinger in 1927 based on the principles of quantum mechanics. It was an advancement over the Bohr model of the atom.

In this model, the atomic orbital is described as a region in space where there is a high probability of finding an electron. Hence, the electron is not found in specific orbits according to the Bohr model, rather, we describe the probability of finding the electron. This is the contemporary approach to the study of atomic structure.

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Answer:

0.121

Explanation:

for reverse reaction use the receprocal of 8.24

Answer:

ΔT = 66.06°C

Explanation:

Given data:

Mass of iron = 750 g

Heat absorbed = 22000 j

Change in temperature = ?

Solution:

Specific heat capacity:

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

specific heat capacity of iron is 0.444 J/g.°C

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

By putting values,

22000 j = 750 g × 0.444 J/g.°C × ΔT

22000 j = 333 J/°C × ΔT

ΔT = 22000 j  /333 J/°C

ΔT = 66.06°C

Answer:

See explanation

Explanation:

On a certain day, our teacher came to class with a container having some salt, some sand and a few pieces of iron in it. She was about to introduce a lesson on separation of mixtures.

Then she held a large bar magnet close to the mixture and shook it, the pieces of iron were attracted by the magnet and separated from the mixture.

Next, she poured some water into the mixture and the salt dissolved. She got a filter paper and separated the solution from the sand.

Then she heated the solution to dryness in an open crucible and the salt was recovered.

Answer:

nuclear energy

Explanation:

heat and light is due to release of energy due to nuclear fusion in the sun

Answer:

Chemical energy

Explanation:

Answer:

15 is the answer your welcome

Answer:

a

Explanation:

contains subatomic particles named the proton,neutron and electron

An atom is the smallest particle of a substance that can take part in a chemical reaction. It is composed of subatomic particles.

The statements that best describe an atom are;

Atoms of elements are the smallest particle of the element. According to the law of conservation of mass, atoms of elements retain their identity in a chemical reaction.

An atom is composed of a massive inner core having neutrons and protons and then a cloud of charge hovering over this dense inner core.

The atom has no net charge because the number of protons and electrons are exactly equal.

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Answer: 311kpa

Explanation:

The two cell components that have the same function but for different chemical components are lysosome and peroxisome (option A).

Lysosomes are organelles found in all types of animal cells which contains a large range of digestive enzymes capable of splitting most biological macromolecules.

On the other hand, peroxisomes are intracellular organelle found in all eukaryotes which is the source of the enzymes that catalyze the production and breakdown hydrogen peroxide, and are responsible for the oxidation of long-chain fatty acids.

Lysosomes and peroxisomes are two membrane-bound organelles that perform digestive function, however, they differ in the molecules they break down.

Therefore, the two cell components that have the same function but for different chemical components are lysosome and peroxisome.

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