Match the type of mechanical waves to images of particle motion. In each case, the wave moves from left to right.

Answer:

Explanation:

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The heat of combustion per gram of quinone is -25.43 KJ/g.

Given,

mass of sample = 2.300g

total heat capacity = 7.854 kJ/∘C

Temperature change = 32.09 - 24.64 = 7.45

we have to find out heat of combustion per gram of quinone.

- Q(rxn) = Q(cal) = C(cal)ΔT

Q(rxn) = -(7.854kJ/⁰C)(32.09 - 24.64)

= -58.5 KJ

Now, we will calculate heat of combustion per gram.

Q(rxn) = -58.5/2.3g = -25.43 KJ/g

negative sign denote exothermic reaction.

Thus, heat of combustion per gram of quinone is -25.43 KJ/g.

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The pOH of the substance is known to be given by the hydroxide ions. A substance has a pOH of 5.9. The [OH-] of the substance is 7.23.

By estimating the concentration of OH ions in a solution, pOH can be used to gauge both acidic or alkaline a solution is. The OH ion concentration's negative logarithm is known as pOH.

pOH = -[tex]\rm -Log_{10}[OH]^{-}[/tex]

In this problem,[tex]\rm -Log_{10}[OH]^{-}[/tex]

pOH =    ] =    [tex]\rm -Log_{10}[OH]^{-}[/tex]

- log₁₀[5.9] = 7.23

A substance has a pOH of 5.9. The [OH-] of the substance is 7.23 .

Once you get the value of pOH  we will get the value of pH.

pOH  =  14 - pH

pH = 14 - 3 = 11

An acid that is weak is [tex]\rm H_{2} S[/tex]. As a result, has a pH of 3.92.

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The equation of this straight line is equal to y = -1/2x + 1.

First of all, we would determine the slope of the straight line by using this formula:

[tex]Slope,\;m = \frac{Change\;in\;y\;axis}{Change\;in\;x\;axis}\\\\Slope,\;m = \frac{y_2\;-\;y_1}{x_2\;-\;x_1}[/tex]

By critically observing the graph, the points on the x-axis and y-axis is given by:

Points (x₁, x₂) = (0, 2)

Points (y₁, y₂) = (1, 0)

Substituting the given points into the formula, we have;

Slope, m = (0 - 1)/(2 -0)

Slope, m = -1/2

In Mathematics, the y-intercept of any graph occurs at the point where the value of "x" is equal to zero (0).

y-intercept = (0, 1)

Mathematically, the standard form of the equation of a straight line is given by;

y = mx + c

Where:

Substituting the parameters into the formula, we have;

y = -1/2x + 1.

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Human body can be both closed and open system.

Human body is closed system in sense that all its constituents are closed within human body and it can be open system in sense that the entire system includes both human body and its interacting environment.

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The wavelength of an electron moving with a velocity of 2.05×10^7 ms^−1 is 3.55×10^−11 m​.

What is de Broglie wavelength ?

In accordance with wave-particle duality, all quantum mechanical objects exhibit the De Broglie wavelength, which establishes the probability density of discovering the object at a specific location in the configuration space.

The de-Broglie equation can be used to determine an electron's wavelength.

λ= h/mv

=  6.626×10^−34 Js / 9.11×10 ^−31 kg×2.05×10^7 m/s

 =3.55×10^−11 m​

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Question:

Calculate the wavelength of an electron moving with a velocity of 2.05×10^7 ms^−1.

Well here is my explanation: 9.35 is added. Which, equals 19.45, which means the 9.35 is the granite. Now to round it up.

My answer rounds up nearing 19.451. If I am wrong, feel free to shame me!

A small piece of granite is placed into the cylinder, displacing the water to a volume of 19.45 mL. The volume is 19.451.

Volume is the three-dimensional area that a substance occupies or that is encircled by a surface. The cubic meter is the common unit of volume in the International System of Units (SI).

The liter (L) is the volume unit used in the metric system. A 10-centimeter cube has a volume equal to one liter. Gases have a volume equal to the internal capacity of the container since they fill their containers to the brim.

Containers with a designated volume or one whose internal shape is known are frequently used to measure liquids. Measuring cups, graded cylinders, flasks, and beakers are a few examples of the tools used to measure liquid volume.

Therefore, A small piece of granite is placed into the cylinder, displacing the water to a volume of 19.45 mL. The volume is 19.451.

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Answer: 2g

Explanation: 12.044 * 10^23/6.022*10^23 * 1 = 2

Answer:

The pH of the solution is 6.17.

Explanation:

To find the pH of the solution, we have to first calculate its pOH using the formula:

[tex]\boxed{\mathrm{pOH = - log_{10}[OH^-]}}[/tex]

Substituting the given value of [OH⁻] into the formula, we get:

[tex]\mathrm{pOH = -log_{10}(1.49 \times 10^{-8})}[/tex]

        [tex]= \bf 7.83[/tex]

Now that we have the value of the pOH of the solution, we can find its pH using the following formula:

[tex]\boxed{\mathrm{pH + pOH = 14}}[/tex]

∴ [tex]\mathrm{pH} + 7.83 = 14[/tex]

⇒ [tex]\mathrm{pH } = 14 - 7.83[/tex]

⇒ [tex]\mathrm{pH } = \bf 6.17[/tex]

The following are true about a theory;

A theory is an explanation that is given to a phenomenon which may have some kind of underpinning reasoning that may not necessarily be empirical. Thus a theory has withstood some kind of scrutiny but is not yet absolutely accepted as true.

Thus the following are true about theory;

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The VOC started a phase of unprofitable growth. The Netherlands was able to participate as a significant power in the European wars at the turn of the 18th century by recruiting mercenary forces and supporting its allies because its financial strength proved to be more enduring.

Antwerp served as the commercial and financial hub of the Seventeen Provinces and Northwestern Europe. In the end, Antwerp played a significant role in the uprising against the Spanish Ha Amsterdam became one of the most significant commerce hubs in the world during the 17th century Dutch Golden Age. Money was brought about by trade, and along with wealth, the arts and sciences flourished. In the end, the city that joined was designated as the "capital" of the Dutch Revolt.

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The Volume of  Na₂CO₃ solution required to obtain 0.650 moles of Na⁺ ions is 216 mL.

The number of moles sodium ions produced by the dissociation of 1 mole of Na₂CO₃ is determined from the dissociation equation of  Na₂CO₃ given below:

Na₂CO₃ (aq) → 2 Na⁺ (aq) + CO₃²⁻ (aq)

From the equation above, 1 mole of Na₂CO₃ produces 2 moles of Na⁺ ions.

Number of moles of Na₂CO₃ that will produce 0.650 moles of Na⁺ ions = 0.650/2 moles

Number of moles that will produce 0.650 moles of Na⁺ ions = 0.325 moles of  Na₂CO₃ solution.

Volume of  Na₂CO₃ solution required = 0.325/1.5

Volume of  Na₂CO₃ solution required = 0.216 L

Volume of  Na₂CO₃ solution required in mL = 216 mL

In conclusion, the volume of  Na₂CO₃ solution required  is obtained from the molarity and moles of  Na₂CO₃.

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The monoatomic ion of potassium is K+ and Oxygen is O2-

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Answer:

A chemical reaction is a process where bonds are formed between reactant elements causing interaction hence products are formed.

The two types of chemical reaction:

[tex]{ \boxed{ { \rm{ \bold{ \dashrightarrow \: reversible \: reaction}}}}}[/tex]

This is a reaction where reactants interact chemically to form respective products and also products can react to reverse the reaction (to form reactants).

An example of reaction of hydrogen and oxygen:

[tex]{ \rm{2H_{2(aq)} +O_{2(aq)} \: {}{ ^{ \dashrightarrow}_{ \dashleftarrow} \: 2H _{2}O _{(l)} }}}[/tex]

[tex]{ \boxed{ \rm{ \bold{ \dashrightarrow irreversible \: reaction}}}}[/tex]

It is a one way reaction, cannot be reversed

[tex]{ \rm{Mg_{(s)} + N _{2(g) \: }\rightarrow \: \: Mg _{3} N _{2(s)} }}[/tex]

These are  diseases that affect primarily the lungs or any other part of the respiratory system.

The term respiratory disorders refers to those diseases that affect primarily the lungs or any other part of the respiratory system. These are the diseases that prevent a person from breathing in and out normally and prevent the lungs from playing its usual role in gaseous exchange.

The respiratory disorders could be able to make a person not to be able to breathe well and it may lead to hospitalization and death of the patient of adequate treatment is not sought from an expert who could diagnose and treat such respiratory disorders.

The common types of respiratory disorders are;

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Answer: To counterbalance the negative charge on the electrons.

Explanation:

The plum pudding model

Thomson knew that atoms had an overall neutral charge. Therefore, he reasoned that there must be a source of positive charge within the atom

Thomson found that the path taken by the cathode ray could be bent towards a positive metal plate, and away from a negative metal plate. As a result, he reasoned that the particles in the cathode ray were negative.

: )

Answer: the powdered juice dissolves

Explanation: powdered juice is completely dissolved in water making it present in all the water

The number of moles of carbon in the original sample is 0.15 moles.

Let the formula of compound be CaHbOc.

The reaction when this compound undergoes combustion is as follows,

CaHbOc + O2 = CO2 + H2O

We are given that 4.50 g of compound releases 6.60 g of CO2 and 2.70 g of H2O.

First we have to calculate the moles of CO2 and H2O by dividing the given mass by their molar mass.

Moles of CO2 = 6.60/44 = 0.15 moles

Moles of H2O = 0.15 moles

The mass of carbon in CO2 = 0.15 x 12 = 1.80 g

The mass of carbon in CO2 is equal to the mass of carbon in the original sample.

Therefore, the number of moles of carbon in the original sample is 0.15 moles.

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Because the mixture's components are so dissimilar in terms of their sizes, forms, textures, and colors, the traditional method of handpicking might work best for separation.

To separate the sand from the grass and pebble mixture, use a sieve that is relatively fine (the one occasionally used in the kitchen will work well:)). Pebbles and grass will pass through the sieve without the sand.

Put the grass and pebble mixture in a beaker and add water. Based on variations in their densities, the process of sedimentation is used to distinguish grass, which floats at the top, from stones, which settle at the bottom. To restore the separated grass to its original condition, blow it dry.

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Answer:

1. Energy intensity (primary energy consumption divided by GDP) for the world and various countries. The lower the value, the less energy is used to generate economic output, so lower means more efficient in a sense.

2.Lower Your Thermostat. Adopt the habit of lowering the temperature on your thermostat while away from home.

Start a Compost Pile.

Install Low-Flow Showerheads.

Seal All Windows.

Limit Space Heater Use.

Turn Off Unnecessary Water.

Replace Incandescent Bulbs.

Unplug Unused Chargers.

54% is the calculated percent yield.

The correct answer is:

Finding the limiting reactant is the first step. To do this, we figure out how many moles there are of each ingredient and divide the answer by the stoichiometric coefficient.

3.4 g octane divided by 114.23 g/mol yields 0.030 mol octane.

0.015 mol octane/2 0.030

5.9 g O2 / 32 g/mol equals 0.18 mol O2.

0.0074 mol = 0.18 mol O2/25

The limiting reactant in this example is oxygen, which is the lower number. The value is in accordance with the reaction's theoretical yield. In a similar manner, the product is used to determine the genuine yield. 0.0636 mol CO2 is equal to 2.80 g CO2/44.01 g/mol.

0.00398 mol = 0.0636 mol CO2/16

The ratio of the two times 100 is what determines the percent yield.

% yield = 0.0398/0.0074 * 100, or 54%.

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Option B is the correct answer it is accurate, precise both .

Accuracy refers to how close average valve is to the actual valve.

a) Average of measured valve is far from the actual valve, so  neither precise nor accurate.

b) Average valve = actual valve ,so it is precise as well as accurate.

c) Average of measured valve is far from the actual valve, so neither precise nor accurate .

d) Average valve is close to only measured valve, hence measurement is accurate but not precise.

Hence option B  is correct .

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Answer:

A bed

Explanation:

Four legs up, four legs down, soft in the middle, and hard all round.

Polyethylene polymer can be changed to make it less flexible, stronger, and harder by: (a) Cross-linking the layers of polyethylene using covalent bonds.

Polyethylene is the polymer extensively used to make plastic products. It is light, versatile and flexible substance. It can be made more stiff by introducing covalent bonds to form the cross-links between the layers. The more will be the cross-links between the layers, reduced will be the length of the polymer and hence the stiffness is increased while reducing the flexibility.

Covalent bonds are the strongest type of bonds formed by the sharing of electrons between two or more atoms. The sharing is mutual between the atoms and they do not much electronegativity difference between them.

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Answer:

C.The measure of mass of a material within a given space.

Explanation:

C. The measure of mass of a material within a given space.

The ions that are formed by the ions is;

The term ion refers to a specie that is obtained by the loss or gain of electrons. A positive ion is formed by the loss of electrons while a negative ion is formed by gain of electrons.

A positive ions has more protons than electrons while a negative ion has more electrons than protons. There is only one major ion that could be formed by main group elements.

The ions that are formed by the ions is;

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Answer: 2.409 x [tex]10^{23}[/tex]

Explanation:

To find molecules, we multiply the number of moles by Avogadro's number over one mole of the element (in this case it is carbon).

[tex]4.00 C moles (\frac{6.022 x 10^{23}moleculesC }{1 C moles} )[/tex] = 2.409 x 10^23

a. The percentage relative uncertainty is 1.1 %

b. The absoulte uncertainty is ± 1.9

Since 91.3 (+-1.0) mM * (40.3 (+-0.2) mL) / (21.1 (+-0.2) mL) is in the form

R = A × B/C, the relative uncertainty is given by

ΔR/R = √[(ΔA/A)² + (ΔB/B)² + (ΔC/C)²] where

Substituting the values of the variables into the equation, we have

ΔR/R = √[(ΔA/A)² + (ΔB/B)² + (ΔC/C)²]

ΔR/R = √[(0.2 mM/91.3 mM)² + (0.2 mL/40.3 mL)² + (0.2 mL/21.1 mL)²]

ΔR/R = √[(0.002191)² + (0.004963)² + (0.009479)²]

ΔR/R = √[0.00000480 + 0.00002463 + 0.00008985]

ΔR/R = √0.00011928

ΔR/R = ± 0.0109

ΔR/R ≅ ±0.011

So, the percentage relative uncertainty % ΔR/R = ΔR/R × 100 %

= 0.011 × 100 %

= 1.1 %

So, the percentage relative uncertainty is 1.1 %

Since R = A × B/C where

So, R = A × B/C

= 91.3 mM × 40.3 mL/21.1 mL

= 3679.39 mMmL/21.1 mL

= 174.38 mM

≅ 174.4 mM

Now, the absoulte uncertainty in R, ΔR = ΔR/R × R

= ±0.011 × 174.4 mM

= ± 1.92

≅ ± 1.9

So, the absoulte uncertainty is ± 1.9

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