Is the structure of C4H6 rigid? (i.e. is it unable to rotate/move?) If not, which part of the molecule is not rigid? Try to describe the shape of this molecule.

The assumption that an atom is indestructible is refuted by the fact that it can be further split into protons, neutrons, and electrons.

However, an atom is the smallest particle involved in chemical reactions. According to Dalton, every aspect of an element's atoms is the same.

The atom is the smallest unit of matter that may be divided without generating particles with an electrical charge. It is also the smallest material with properties resembling chemical elements. As a result, the atom acts as the basic building block of chemistry. Examine various electron configurations in the electron shells that enclose the atomic nucleus of an atom.

Examine various electron configurations in the electron shells that enclose the atomic nucleus of an atom. An atom is primarily made of space. The rest is made up of a positively charged nucleus made up of protons and neutrons that is surrounded by a cloud of negatively charged electrons. The nucleus is small and dense in comparison to electrons, which are the lightest charged particles in nature.

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Answer:

q

=

−

176000

J

×

1

k

J

1000

J

=

−

176

k

J

The specific heat capacity of the metal can be calculated using calorimetric equation. The specific heat capacity of the metal is 0.499 J/g °C.

Specific heat capacity of a substance is the heat energy required to rise its temperature by one degree Celsius per one gram. It is an intensive property and thus constant for a substance.

The calorimetric equation connecting the mass m, specific heat capacity c, temperature difference ΔT  with the heat energy q is written as :

q = m c ΔT .

Given the heat energy of the metal is lost to ethylene glycol. Hence the heat energy change for both of the substance are equal and can be written as follows:

135 g × (153 -38.2 °C ) × c = 255 g × 2.43 J/g °C × (38.2 -25.7 °C)

c = [ 255 g × 2.43 J/g °C × (38.2 -25.7 °C) ] / [ 135 g × (153 -38.2 °C ) ]

  = 0.499 J/g °C.

Hence, the specific heat capacity of the metal is 0.499 J/g °C..

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of chlorine gas =1 atm

V= volume of chlorine gas =18.5L

n =number of moles of chlorine gas

T =temperature of chlorine gas =298K

R = Gas constant = 0.0821 L.atm/K.mol

1 atm×18.5L= 0.0821×n×298K

1 atm×18.5L=n×24.4

n=0.75mol

mass of chlorine=0.75mol×35.453 g/mol

                          =26.55g

Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

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a) The number of moles of LiOH in 1.0L of 0.25M LiOH is 0.25.

b)  The mole-to-mole ratio of LiOH to OH⁻ is  1:1.

c) The number of moles of  OH⁻ ions in 1.0L of 0.25M LiOH is 0.25.

d) The pH is equal to 13.39.

A mole can be defined as a unit for the measurement of a huge number of entities of atoms, molecules, ions, or other particular particles.  The number of entities constitute in one mole is equal to 6.023 × 10 ²³ which is known as Avogadro’s constant.

The dissociation of LiOH in water is as:

LiOH (aq) →  Li⁺(aq)  + OH⁻(aq)

The mole-to-mole ratio of LiOH to OH- in the balanced chemical equation is 1 : 1 as one mole of LiOH produces one mole of OH⁻ ions.

Given, the number of concentrations of LiOH solution = 0.25 M

The volume of the solution  = 1.0 L

The number of moles of LiOH = Molarity ×Volume

n = 0.25 × 1

n = 0.25 mol of LiOH

The number of moles of ions of OH⁻ from LiOH = 0.25 mol

We know that pH + pOH = 14

pH = 14 -pOH

pH = 14 - (-log [OH⁻])

pH = 14 + log (0.25)

pH = 13.39

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The number of moles of the gas is 0.016 moles

The airbag reaction is the nitrogen gas obtained by the decomposition of sodium azide and the reaction is

2NaN₃ → 2Na + 3N₂

Then it is under ideal condition

P = 1atm

V = 1L

T =  495°C or 768 K

n = ?

We have to calculate moles of nitrogen = ?

R = 0.082 atm LK⁻¹mol⁻¹

So the formula is

PV =nRT

n = PV/RT

n = 1 atm×1L/0.082 atm LK⁻¹mol⁻¹×768 K

n = 0.016 moles

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Taking into account the reaction stoichiometry, 2.778 moles of oxygen are needed to react with 100 grams of aluminum.

In first place, the balanced reaction is:

4 Al + 3 O₂  → 2 Al₂O₃

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 molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 108 grams of Al react with 3 moles of O₂, 100 grams of Al react with how many moles of O₂?

moles of O₂= (100 grams of Al× 3 moles of O₂)÷ 108 grams of Al

moles of O₂= 2.778 moles

Finally, 2.778 moles of oxygen are needed.

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The specific heat of the metal is 1.1106 J/g°C

Specific heat is the quantity of heat required to raise the temperature of one gram of a substance by one celsius degree

Here given data is

Mass of unknown metal = 23.8g

Temprature = 100°C

Mass of water = 50.0cm³ = 50 g

Temprature of water =  24.0°C

Final temprature of the system = 32.5°C

We have to find specific heat = ?

So first we determine the heat gain by water

Specific heat of water is 4.18 J/g°C

Q = mcΔT

Q =  50 g×8.5°C×4.18 J/g°C

Q = 1776.5 Joules

Then we determine the total heat lost by the unknown metal

Taking the specific heat f the metal to be x

Heat = 23.8g×67.5°C×x

1776.5 Joules = 23.8g×67.5°C×x

1776.5 Joules = 1606.5 J

x =  1606.5 J/1776.5 Joule

x = 1.1106 J/g°C

Specific heat of the metal is  1.1106 J/g°C

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Answer: 1 one is B 2 one is C 3 one is A

The sun, moon, and planets of the solar system are shown with their orbits.

The loops in Ptolemy’s

1 one

A retrograde

B geocentric

C retrograde

model, and those shown on the video, are called

2 one

A heliocentric

B geocentric

C retrograde

motion.

This phenomenon is caused by Earth’s

3 one

A faster

B slower

C larger

orbit than those of other planets.

The temperature of the silver will decrease by -828.7 °C

if it loses 982 J of heat energy

From calorimetry, we understood that heat released or lost is given by:

Q = MCΔT

Where

With the above formula, we can determine the temperature change of the silver. This is illustrated below

Q = MCΔT

-982 = 5 × 0.237 × ΔT

-982 = 1.185 × ΔT

Divide both side by 1.185

ΔT = -982 / 1.185

ΔT = -828.7 °C

Thus, the temperature will decrease by -828.7 °C

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sodium + water + - sodium hydroxide + hydrogen is the word equation  to produce sodium hydroxide and hydrogen gas.

Option B is correct.

A colorless solution of sodium hydroxide (NaOH) and hydrogen gas is created when sodium metal interacts quickly with water (H2).It is an exothermic process.

Na+ and OH- ions result from the reaction NaOH and H2O. Heat will be released because the process is exothermic. Since sodium hydroxide is regarded as a strong base, it can completely and entirely dissociate in aqueous solution.

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Answer: calcium

Explanation:

Answer:

The answer is 117.

Explanation:

There’s not really a way to calculate atomic radius. It comes from empirical data and is in the periodic table. The only way I can think of is Bohr’s radius constant.

₀ = 4₀(ℎ bar)²/_e (_e)²

Calculating atomic radius can get complicated so it’s best to leave it at this.

A Mole should not be considered a base unit in the SI system.

SI system is a metric system which is also known as the International system of units. Most of the measurements across the globe is measured by SI system. SI units are used in nearly every part of the globe, such as science, technology, mathematics and many more. The system includes coherent units known as derived units.

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Answer:

A) Warmer

Explanation:

it says above 0

The maximum possible efficiency of the heat engine that uses reservoirs at 800°C and 0°C is 74%.

Maximum efficiency is mainly calculated for heat engines.

Let the starting temperature be T1 and the 2nd temperature is T2.

Since the given temperatures are in Celcius form, we have to first convert the temperatures into Kelvin form for proper calculation of maximum efficiency.

So, T1 = 0 + 273 = 273 K

T2 = 800 + 273 = 1073 K

We know,

Maximum efficiency = (T2- T1)/T2

= (1073 - 273) / 1073

= 800 / 1073

= 0.74

= 74 %

Therefore, the maximum efficiency of the heat engine will be 74%.

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A chemist adds a buffer to a solution because the buffer can keep the pH stable when small amounts of acid or base are added. Thus, Option A is correct.

Buffer is a solution that resists the change in pH when acid or alkali is added in a small amount. Buffer is made up of weak acid and its conjugate base or a weak base and its conjugate acid. It absorbs H+ and OH- ions when strong acid or alkali is added so that the pH remains the same and neutralizes the added acid or alkali. While maintaining the pH of the solution, the pH of the buffer changes in a small amount.

Thus, a chemist adds a buffer to a solution to keep the pH constant when strong acid or base is added.

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The highest energy transition in the hydrogen atom among the following is from n=6 to n=3. Hence option d is correct.

Bohr model of atom proposed the modern atomic model based on the interpretations from quantum mechanics. According to this model, electrons are revolving around the atom through circular paths of fixed energy.

The energy of the se levels and the momentum of electrons can be determined using Bohr's equation. Electrons can transit between these energy levels. The Rydberg formula for the transition is written as follows:

[tex]\frac{1}{\lambda} = R [\frac{1}{n_{1}^2} -\frac{1}{n_{2}^2} ][/tex]

Here, R is the Rydberg constant and n1 and n2 be the first and second energy levels.

The transition n=6 to n=3 gives the higher value for this equation. Hence, this transition results highest energy absorption.

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A sample containing 4.5 g of an unknown gas. Based on the volume, temperature, and pressure of the sample, there are 0.14 moles of gas present.  the molar mass of this unknown gas is

given that :

the mass of unknown gas = 4.5 g

number of moles of unknown gas = 0.14 mol

the number of moles is given as :

number of moles = mass / molar mass

molar mass of unknown gas =  mass / moles

                                               = 4.5 / 0.14

                                               = 32.14 g/mol

Thus, A sample containing 4.5 g of an unknown gas. Based on the volume, temperature, and pressure of the sample, there are 0.14 moles of gas present.  the molar mass of this unknown gas is

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1. Baking cookies in the oven is an example of how energy is conserved.

2. Electrical energy is neither transformed nor transferred.

3. Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

Baking is the process of cooking with dry heat, particularly in an oven. It is most likely the oldest type of cooking. Bakery goods including bread, rolls, cookies, pies, pastries, and muffins are typically made with flour or meal that comes from grains of some kind.

The stages of the ingredients originally start out in distinct states (e.g., flour is solid, eggs are liquid, etc.), and they change several times as the cookies bake. When they are combined to create cookie dough, a state known as a colloid results (like a mix between solid and liquid). Eventually, the cookies reach a solid state when baking is.

Thus, Baking cookies in the oven is an example of how energy is conserved . Electrical energy is neither transferred or transformed . Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

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What do you mean by molarity?

Molarity-Molarity is a term that is used to show concentration of the solution . It is different from molality as it is expressed in mol per L , whereas molality is expressed in mol per kg.

Given:

The mole of Mgs is calculated as follows :

    Mole= Mass / Molar Mass

              = 25.7g/56.38 g/mol

              = 0.455 mol.

The molarity of Mgs solution is calculated as follows :-

            Molarity =Mole/Volume ( L )

                            =0.455mol/919ml* 1000ml/1L

                            =0.495M

Thus, the molarity of the solution is 0.495 M.

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The final solution has a strength of 2%.

Let the initial volume of solution = x unit^3

The solution is initially by 20%

Amount of solute = x*20/100

                             = x/5 unit^3

Now,  

We first diluted by 1:5

1 part of initial solution is diluted with 4 parts of diluent

For 'x' unit^3 solution,

Diluent added = 4x unit^3

Total volume of solution becomes = x+4x

                                                          = 5x unit^3

Now,

We diluted by 1:2

1 part of solution is diluted with 1 part of diluent

5x unit^3 of solution is diluted with 5x unit^3 of diluent

Final solution = 5x + 5x = 10x unit^3

Final strength = (Amount of Solute/Final solution)*100%

                       = (x/5/10x)*100%

                       = x/50x*100%

                       = 2%  

The final strength of final solution is 2%

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Answer:

c. a reaction in which oxidation numbers change

Explanation:

In an oxidation reaction there is loss of electrons whereas in a reduction reaction there is gain of electrons. Therefore, a reaction in which oxidation numbers change identifies an oxidation-reduction reaction.

Answer:

C: a reaction in which oxidation numbers change.

Explanation:

The full burning of 6.70x10-3 g of methane results in the production of 2.95872 mass of carbon dioxide.

Burning is sometimes referred to as combustion. A fuel is heated and interacts with oxygen in a combustion reaction. The three elements of fuel, heat, and oxygen required for combustion are summarized by the fire triangle.

Chemical processes that occur during combustion are frequently quite exothermic. The energy of chemical molecules generated during this reactive process is used by combustion systems to power vehicles, produce electricity, or heat a variety of uses.

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For any component: Proton count equals atomic number

Number of protons plus number of electrons equals the atomic number.

The number of neutrons is equal to the atomic number-mass number.

The quantity of protons in an element's atom is known as the atomic number. The atomic number of krypton in our illustration is 36. This indicates that the nucleus of a ruthenium atom contains 36 protons.

Every atom of ruthenium has 44 protons, which is intriguing. A Ruthenium atom cannot exist if it does not have 44 protons. A distinct element is produced by changing the number of protons in an atom's nucleus. An atom of rhodium is produced, for instance, by taking one proton away from a krypton atom.

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Any object which have less density than the mercury will float in it and which have higher density will sink on it. Here, gold has higher density than  mercury. Thus it will sink on mercury.

Density of a substance is the measure of its mass per volume. Thus it says about how much denser the substance is in a specific volume. The ratio of density of an object to the density of  water is called specific gravity.

The density of mercury is 13.4 g/ml. Any object which is less dense than mercury will float on its surface whereas, objects which have higher density than mercury will sink on it.

The density of gold is 79.3 g/ml. All other given metals iron, lead and copper have a density less than that of mercury. Hence the substance which sink on mercury is gold. Option Dis correct.

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Answer:

In each test, iron(II) sulfate and iron(III) nitrate were combined with the same substance or substances. However, the sulfate and nitrate parts of the compounds didn’t participate in any of the chemical reactions; only the iron ions reacted. Comparing the results for each pair of tests, what can you conclude about the iron(II) and iron(III) ions? i need the answer to it please do this

There are various kind of reaction like combustion reaction, displacement reaction. So to solve this problem we must be knowing the displacement reaction. Displacement reaction is taking place over here

What is displacement reaction?

Displacement reaction is a reaction in which one atom replaces other atom from a molecule on the basis of reactivity strength. The element which on the top of reactivity series displace the element that is lying below to that reactive element

According to our question the balanced equation is

FeSO₄+Zn ZnSO₄+Fe(II)

Fe(NO₃)₂+Zn      Zn(NO₃)₂+Fe(II)

In both reaction Zn is more reactive than Fe(II) and Fe(III) that is why Zn replace or displace iron ion from its compound of sulfate and nitrate. Metal displace metals. anions are displaced by anions. So, here metal is displaced by zinc.

Thus we can conclude that zinc is more reactive than iron Fe(II) and Fe(III). Displacement reaction is taking place over here

Hope this helps!

Explanation:

I can't see the questions!!