2. The change in internal energy for the expansion of a gas sample is -4750 J. How much work is done if the gas sample loses 1125 J of heat to the surroundings? Is this work done by the gas or done by the surroundings?

Answer:

Explanation:

It is because they contain ethyl alcohol and they are inflammable. The perfume contains alcoholic substances like the ethyl alcohol or the ethanol. After reaching the flash point,the combustion of ethanol takes place inside the bottle and the internal combustion created pressure causes explosion.

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Answer:

because they contain ethyl alcohol and they are inflammable.

Answer:

The answer to your question is given below

Explanation:

8. The equation for the reaction is given below:

Mg3N2 + H2O –> Mg(OH)2 + NH3

Number of reactant atoms before balancing:

Mg = 3

N = 2

H = 2

O = 1

Number of product atoms before balancing:

Mg = 1

N = 1

H = 5

O = 2

Now, let us balanced the equation.

Mg3N2 + H2O –> Mg(OH)2 + NH3

There are 3 atoms of Mg on the left side and 1 atom on the right side. It can be balance by putting 3 in front of Mg(OH)2 as shown below:

Mg3N2 + H2O –> 3Mg(OH)2 + NH3

There are 2 atoms of N on the left side and 1 atom on the right side. It can be balance by putting 2 in front of NH3 as shown below:

Mg3N2 + H2O –> 3Mg(OH)2 + 2NH3

There 2 atoms of H on the left side and a total of 12 atoms on the right side. It can be balance by putting 6 in front of H2O as shown below:

Mg3N2 + 6H2O –> 3Mg(OH)2 + 2NH3

Now the equation is balanced.

Number of reactant atoms after balancing:

Mg = 3

N = 2

H = 12

O = 6

Number of product atoms after balancing:

Mg = 3

N = 2

H = 12

O = 6

9. When methane react with steam, carbon dioxide and hydrogen gas are produced as shown below:

CH4 + H2O –> CO + H2

Now, let us balance the equation. This is illustrated below:

There are a total of 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2 as shown below:

CH4 + H2O –> CO + 3H2

Now the equation is balanced.

Answer:

Q = mass x sph x temp change

temp change = Q/(mass x sph)

Temp change =57/(22 x .903)

Temp Change = 2.97 ∘C

Temp change 3.0 ∘C

or

We can use the heat equation,

Q = mcΔT

Where Q is the amount of energy transferred (J), m is the mass of the substance (g), c is the specific heat (J g⁻¹ °C⁻¹) and ΔT is the temperature difference (°C).

The given data

 Q = 52 J

 m = 28.4 g

  c = 0.903 J g⁻¹ °C⁻¹

ΔT = ?

By applying the formula,

 52 J = 28.4 g x 0.903 J g⁻¹ °C⁻¹ x ΔT

   ΔT = 2.03 °C

Hence, the temperature change of aluminium during the heating process is 2.03 °C.

Answer:

A central C is double bonded to an O, and single bonded to 2 H

Explanation:

Methanal, also known as formaldehyde, is a chemical compound used to preserve dead biological specimens for further study. It is called formalin when in a solution and it helps keep specimens in a fresh state by hardening the tissues of the specimen involved.

Formaldehyde is a gaseous compound that has an aldehyde functional group i.e. -CHO and has a chemical formula, H-CHO or CH2O as described in the question that a central C is double bonded to an O, and single bonded to 2 H (see attached image for structural formula).

The chemical for the preservation of biological specimens has consisted of central C with a double-bonded O and two single-bonded hydrogens. Thus, option A is correct.

The biological compound that has been used to preserve biological specimens has been methanal. It has been the simplest aldehyde. The chemical formula of formaldehyde, also known as methanal has been H-CHO.

The structure of formaldehyde has been consisted with single bond between H and C. The central carbon has been associated with a double bond between the C and O, with single-bonded H.

Thus, the chemical for preservation of biological specimen has been consisted of central C with a double-bonded O and two single-bonded hydrogens. Thus, option A is correct.

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Answer:

Explanation:

Here, V1=900cm3, V2=300cm3

T1=(27+273)K=300K, T2=?

Applying Charles's law,

V1T1=V2T2

∴T2=V2T1V1=300cm3×300K900cm3=100K

=100−273=−173∘C

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Answer:

A chemical element

Explanation:

A chemical element consists of only one type of atom.

Answer:

D. 5,170 J

Explanation:

Answer:

4.08 grams

Explanation:

Essentially, we're looking for the mass of HCl that "matches" 3.26 grams of magnesium hydroxide.

First, convert 3.26 grams of [tex]Mg(OH)_2[/tex] into moles by dividing by the molar mass. The molar mass of [tex]Mg(OH)_2[/tex] is 24.3 + 16 * 2 + 1 * 2 = 58.3 g/mol. So, 3.26 grams is equal to:

3.26 g ÷ 58.3 g/mol = 0.0559 mol [tex]Mg(OH)_2[/tex]

Notice that from the chemical equation, magnesium hydroxide and hydrochloric acid (HCl) have a ratio of 1 to 2. In other words, for every 0.0559 moles of [tex]Mg(OH)_2[/tex], there are 0.0559 * 2 = 0.112 moles of HCl.

Finally, convert moles of HCl to grams by multiplying 0.112 by the molar mass, which is 1 + 35.45 = 36.45 g/mol:

0.112 mol HCl * 36.45 g/mol = 4.08 g HCl

The answer is thus 4.08 grams.

~ an aesthetics lover

Answer:

there is an increase by 0.18 V in the cell voltage.

Explanation:

The given equation of the reaction can be well written as

[tex]2AgCl_{(s)} + Zn _{(s)} \to 2Ag_{(s)} + 2 Cl^- _{(aq)}+ Zn^{2+}_{(aq)}[/tex]

By application of Nernst Equation ; we have the expression

[tex]E_{cell} = E^0- \dfrac{0,059}{n}log (\dfrac{[product]}{[reactant]})[/tex]

here in the above equation;

n = number of electrons transferred in the equation of the reaction

n = 2

Also;

[tex]E^0 = E_{cathode} - E_{anode}[/tex]

[tex]E^0 = E_{Ag^+/Ag} - E_{Zn^+/Zn}[/tex]

[tex]E^0 = +(0.80 \ V) - (-0..76 \ V)[/tex]

[tex]E^0 = (0.80 \ V +0..76 \ V)[/tex]

[tex]E^0 = 1.56 \ V[/tex]

If the zinc ion concentration is kept constant at 1 M; we have:

[tex]E_{cell} = E^0- \dfrac{0.059}{n}log (\dfrac{[product]}{[reactant]})[/tex]

[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log ({[Zn^{2+} ]}{[Cl^{2-}]})[/tex]

[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log (1)[/tex]

Since log(1) = 0

Therefore;

[tex]E_{cell} = 1.56\ V[/tex]

When the chlorine ion concentration is decreased from 1 M to 0.001 M; we have;

[tex]E_{cell} = E^0- \dfrac{0.059}{n}log (\dfrac{[product]}{[reactant]})[/tex]

[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log ({[Zn^{2+} ]}{[Cl^{2-}]})[/tex]

[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log ({[1*0.001^2}]})[/tex]

[tex]E_{cell} = 1.56 - 0.0295 \ * \ log ({[1*10^{-6}}]})[/tex]

[tex]E_{cell} = + 1.737 \ V[/tex]

The change in voltage = [tex]E_{cell} - E^0[/tex]

=( 1.737 - 1.56 )V

= 0.177 V

≅ 0.18 V

Thus; from the following observation; there is an increase by 0.18 V in the cell voltage.

The voltage of the cell increased by 0.18 V.

The equation of the reaction is; 2AgCl(s) + Zn(s) → 2Ag(s) + 2Cl– + Zn2+

We know that;

E°cell = 1.36 - (-0.76) = 2.12 V

If the cells are both at 1M concentration the Ecell = E°cell = 2.12 V

When the concentration of Cl- decreased from 1 M to 0.001 M

Ecell =  E°cell - 0.0592/n log Q

Substituting values;

Ecell = 2.12 V -  0.0592/2 log (1 × (0.001)^2)

Ecell = 2.298 V

Increase in voltage = 2.298 V - 2.12 V = 0.18 V

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Answer:

smaller volume ⇒ Crowded particles ⇒ More collisions  ⇒ Higher pressure

Explanation:

Smaller the volume , more crowed the particles . Then the particles will have rapid collisions so the free mean path is decreased , hence the pressure will be increased as follows

[tex]P=\frac{K_bT}{\sqrt{2}\pi d^2\lambda }[/tex]

where λ is mean free path , P is pressure .

The sequence the represent the relationship between pressure and volume of an ideal gas is: smaller volume right arrow Crowded particles right arrow More collisions right arrow Higher pressure

The kinetic molecular theory made five postulates which are used to explain the behaviour of gases.

From the postulates, he uses the kinetic molecular theory to explain Boyle's Law because the majority of a gas's volume in space is usually empty and may be compressed.

So, when a gas is compressed without affecting its temperature, the average kinetic energy of the gas particles remains constant. The particles continue to flow at the same rate, but the container has reduced.

As a result, the particles go from one end of the container to another in less time. This suggests they're hitting the barriers (collision) more frequently. Each and every increase in the frequency of collisions with the walls, thus, results in an increase in the gas's pressure.

Hence, as the volume of a gas decreases, the pressure of the gas increases.

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Answer: The concentration of hydrogen ion is 2.5 x 10∧-3.

Explanation:

It is well known that; pH + pOH = 14

∴ pH + 11.40 = 14

  pH = 14 -11.40 = 2.60

Remember that,

pH = - Log [ H+ ]

2.60 = - log [H+]

To get the  hydrogen ion concentration, we take the anti-log of 2.60.

[H+] = Antilog 2.60 = 2.5 x 10∧-3.

Answer: The chemical formula for lead (II) iodide is [tex]PbI_2[/tex]

Explanation:

Lead (II) iodide is a ionic compound because it are formed by transference of electrons between metals and non metals.The bond formed between a metal and a non-metal is always ionic in nature.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

The nomenclature of ionic compounds is given by:

1. Positive is written first followed by the oxidation state of metal in roman numerals in square brackets.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

The chemical formula for lead (II) iodide is [tex]PbI_2[/tex]

Answer:

399

Explanation:

Pb(SO4)2 contains 1 atom of Pb, 2 atoms of S and 8 atoms of O. So, atomic mass of Pb(SO4)2 is 207 + 64 + 128 = 399 u. Therefore, molar mass of Pb(SO4)2 is 399 g/mol.HOPE THIS helps. Good Luck

Answer:

The molar mass of Pb(SO₄)₂ is 399.32.

Explanation:

To find the molar mass of Pb(SO₄)₂, you have to find the molar mass of each individual element that makes up the compound.

Let's start by figuring out how many of each element is present in the compound.

Pb (lead) - 1

S (sulfur) - 2

O (oxygen) - 8

(SO₄)₂ is a polyatomic ion. It is written in parentheses followed by a subscript of 2. This means that there are two sulfate ions in the compound. So, the number of sulfur atoms and oxygen atoms doubles. (1 × 2 = 2) and (4 × 2 = 8).

Next, look up the molar mass of each element on a periodic table and multiply it by the number of atoms present.

Pb - 207. 2 × 1 = 207. 2

S - 32.06 × 2 = 64.12

O - 16.00 × 8 = 128

Lastly, add up them all together to get the molar mass.

207. 2 + 64.12 + 128 = 399.32

Answer:

A is the answer.

Explanation:

The sound wave is a longitudinal wave which travels in the form of compression and rarefaction . The point where the particles are closer to each other is called compression and the point where the particles are far apart from each other is called rarefaction.

Answer:

Amplitude

Explanation:

Amplitude describes the displacement of the medium's particles. The higher the amplitude, the more dense it is, and the lower the amplitude, the less dense it is.

Pitch is incorrect because it describes the sound

Volume is incorrect because it describes the sound.

Wavelength is incorrect because it describes the distance between a period of a wave.

Answer:

[tex]\large \boxed{\text{0.88 L}}[/tex]

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]

Data:

[tex]\begin{array}{rcrrcl}p_{1}& =& \text{1.34 atm}\qquad & V_{1} &= & \text{ 0.56 L} \\p_{2}& =& \text{0.85 atm}\qquad & V_{2} &= & ?\\\end{array}[/tex]

Calculations:  

[tex]\begin{array}{rcl}\text{1.34 atm} \times \text{0.56 L} & =& \text{0.85 atm} \times V_{2}\\\text{0.750 L} & = & 0.85V_{2}\\V_{2} & = &\dfrac{0.750}{0.85}\\\\& = &\textbf{0.88 L}\\\end{array}\\\text{The balloon's new volume is $ \large \boxed{\textbf{0.88 L}}$}[/tex]

To calculate the actual heat, I'd use calorimetric to weigh a sample mass. I 'd calculate the mass of a material sample. At a specified temperature, I will heat the material. I should position the heated material inside a calorimeter for coffee cup containing an initially established mass of water. I 'd wait for the weather to stabilize and then measure the difference in weather. To assess the sum of energy consumed, I will use the increase in water temperatures. For measure real heat I will use the sum of energy per material, weight, and temperature shift.

-------------------------------

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With all care,

07x12!

Answer:

-I would use calorimetry to determine the specific heat.

-I would measure the mass of a sample of the substance.

-I would heat the substance to a known temperature.

-I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature.

-I would wait for the temperature to equilibrate, then calculate temperature change.

-I would use the temperature change of water to determine the amount of energy absorbed.

-I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.

Answer:Supersaturated

Explanation:The answer is supersaturated because supersaturation is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature. It is supersaturated because there is already a sugar solution and adding another sugar is more than the maximum amount of solute.

Answer:

TiCl2

Explanation:

Mass of the chloride of titanium= 1.31 g

Mass of titanium= 0.528 g

Therefore mass of chlorine = 1.31-0.528 = 0.782 g

To determine the empirical formulae of the titanium chloride, divide the mass of each element by its relative atomic mass and divide through by the lowest ratio.

Ti- 0.528/48 = 0.011, Cl- 0.782/35.5 = 0.022

Ti- 0.011/0.011 , Cl- 0.022/0.011

Ti- 1, Cl-2

Hence the required empirical formula is TiCl2

Answer:

The body of the refrigerator isn’t made of magnetic material.

Explanation:

Same reason why a magnet doesn't stick to a paper or a plastic is the reason behind why Jack's refrigerator is acting out because may be it isn't made of magnetic materials like iron, steel etc, but rather made up of non magnetic things like porcelain, wood etc.

Answer:

D. Two or more elements or compounds that are mixed together but not chemically bonded.

Explanation:

Mixture is unique as it is not chemically bonded and individual entities such as elements or compounds keep their unique identities.

Answer:

Mixture consists of two or three elements or compounds that are mixed together but not chemically bonded.

Answer:

NH3 is the molecular formula of ammonia

Explanation:

i hope this will help you :)

C.

move electrons from anode to cathode

Step-by-step Explanation

Electrical potential is the amount of energy that is available to move electrons from anode to cathode

Answer:

move electrons from anode to cathode

Explanation:

Plato

Answer:

A. can travel through empty space

Explanation:

it is said dat electro magnetic waves or radiation travels through the vacuum of space

Answer:

all of the above. Because, Y'know, electromagnetic radiation is like that.

Answer:

according to quantum physics newtons 3rd law is in the state of nuclear power things so the answer is c

Explanation:

according to quantum physics newtons 3rd law is in the state of nuclear power things so the answer is c

Electrovalent compounds are those that are created when one or more electrons are transferred from one atom to another inside the compound. NaCl is an electrovalent substance because it shares an electron with other compounds to produce them.

A material created by chemically joining two or more distinct components. Examples of compounds are table salt (NaCl), which is generated from the elements sodium and chloride, and water (H2O), which is created from the components hydrogen and oxygen.

One carbon atom and two oxygen atoms combine to form carbon dioxide. One carbon dioxide molecule contains four covalent connections. Because neither carbon nor oxygen are metals, we can infer that carbon dioxide is a covalent molecule.

Pure substances known as compounds are created chemically when two or more elements are combined in a specific mass proportion. Chlorine and sodium combine to form sodium chloride (common salt).

Thus, sodium chloride is called an electrovalent compound whereas carbon dioxide is called covalent compound.

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Answer:

40.47 g Al

Explanation:

In 1 mol of Al, there are 26.98 grams of Al, so Al is 26.98 g/mol.

Simply multiply 1.5 by 26.98 to get your answer.

Answer:

a. KBr

b. CaO

c. MgCl₂

d. NaF

e. NH₃

Explanation:

a. 2K + Br₂ = 2KBr

b. 2Ca + O₂ = 2CaO

c. Mg + Cl₂ = MgCl₂

d. 2Na + F₂ = 2NaF

d. N₂ + 3H₂ = 2NH₃

Answer:

amoeba is the unicellular organism which can be seen by only microscope but not with our nacked eyes

Answer:

An amoeba often called an amoeboid, is a type of cell or unicellular organism which has the ability to alter its shape, primarily by extending and retracting pseudopods Amoebae do not form a single taxonomic group; instead, they are found in every major lineage of eukaryotic organisms. Amoeboid cells occur not only among the protozoa, but also in fungi, algae, and animals.

name of parts of ameoba

3 parts – the cytoplasm, plasma membrane and the nucleus. The cytoplasm can be differentiated into 2 layers – the outer ectoplasm and the inner endoplasm. The plasma membrane is a very thin, double-layered membrane composed of protein and lipid molecule

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Answer:

Ka = 9.2x10⁻⁷

Explanation:

The equilibrium of carbonic acid in water is:

H₂CO₃ ⇄ HCO₃⁻ + H⁺

Where Ka is defined as:

Ka = [HCO₃⁻] [H⁺] / [H₂CO₃]

The equilibrium concentration of the species is:

[H₂CO₃] = 1.9x10⁻² - X

[HCO₃⁻] = X

[H⁺] = X

As pH is -log[H⁺]

3.88 = -log[H⁺]

1.318x10⁻⁴ = [H⁺] = X

Replacing:

[H₂CO₃] = 1.9x10⁻² - 1.318x10⁻⁴ = 1.8868x10⁻²

[HCO₃⁻] = 1.318x10⁻⁴

[H⁺] = 1.318x10⁻⁴

Replacing in ka equation:

Ka = [1.318x10⁻⁴] [1.318x10⁻⁴] / [1.8868x10⁻²]

Answer: 9.2 x 10^-7

Explanation:

Answer:

The mass of nickel is 48μg

Explanation:

Parts per billion is a way to describe small concentrations and is defined as the ratio between μg of solute and kg of solvent.

If a solution of nickel in propanol is 20ppb, contains 20μg of nickel in 1 kg of propanol.

Thus, a sample of 2.4kg of propanol will contain:

2.4kg × (20μg nickel / 1kg) = 48μg nickel