Which of these is an example of a resistor?
A
a battery, which has a positive and negative terminal

B
a light bulb that impedes the flow of electricity

C
an electrical charge moving at a constant rate

D
a conductive path that forms a closed loop

Answer:

0.23 mass percent

Explanation:

The molar mass of Fe(NO3)3 is 241.9 g/mol and the molar mass of NaCl is 58.5 g/mol. This means that for every 1 mol of Fe(NO3)3, there are 4.14 mol of NaCl. In a 0.456 gram sample, this would be 0.01098 moles or 109 mg of Fe(NO3)3 and 0.456 * (4.14 mol / 1 mol) = 1.892 grams or 1892 mg of NaCl

Based on the optical rotation equation, the specific rotation of the compound is -27.73 °C*mL/g*dm,

The optical rotation equation looks like this:

α = [α] * c * l

α - measured optical rotation (-2.67°)
[α] - specific rotation of the compound, temperature, and wavelength used, usually in °C, although more accurately in °C*mL/g*dm

c - concentration of the compound in g/mL (9.63 g / 200 mL = 0.04815 g/mL)

l - length of the polarimeter cell in dm (20.0 cm = 2.00 dm)

If we transform the equation we get:

[α] = α / (c * l) = -2.67° / (0.04815 g/mL * 2.00 dm) = -27.73 °C*mL/g*dm

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Answer: It could help them navigate on a ship

Explanation:

The very light weight of carbon tube makes it far more stronger than steel.

Aside the fact that carbon fibre has more strength than its respective steel, its durability is also an important property which makes it of better use. This implies that it can be used over a long period of time.

However, the great advantage it has over steel or any other metal is that it is very cheap to produce or manufacture.

Carbon is a chemical element found in the group 4 of the periodic table. It has atomic number of 6, valence electrons of 4, proton number of 6, neutron number of 6 and has 6 electrons.

In conclusion, carbon fibre is more stronger than steel in all characteristics including its safety.

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The half-life of the Uranium-235, given that 25% of it is remaining in the rock is 713 million years

We know that half life is the time taken for half of a substance to decay.

Thus, to obtain the half life of the Uranium-235, we shall calculate the number of half lives that has elapsed while in the rock. This can be obtained as follow:

2ⁿ = N₀ / N

2ⁿ = 100 / 25

2ⁿ = 4

2ⁿ = 2²

n = 2

Knowing that 2 half lives has already elapsed, we shall determine the half-life of the Uranium-235. This can be obtained as follow:

t = n × t½

Divide both sides by n

t½ = t / n

t½ = 1.426 / 2

t½ = 713 million years

Therefore, we can conclude that the half-life is 713 million years

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The third value which will make the average absorbency normal lies in the range of 4.6 ml and 10.6 ml.

It can be determined using the following calculation,

The first two values of absorbency are 6.2 ml and 7.2 ml

Also, the absorbency of a towel is considered normal if it can hold between 6 and 8 ml. So obviously the third value will lie within the same range. Let the third value be ‘X’.

‘X’ lies between 6 and 8

The average absorbency of the third reading will be 6.2 + 7.2 + X/3

So combining these two

6 < 6.2 + 7.2 + X /3 < 8

6 < 13.4 + X/3 < 8

Multiplying by 3

18 < 13.4 + X < 24

Subtracting by 13.4

18 - 13.4 < X < 24 - 13.4

4.6 < X < 10.6

Hence the third reading of average absorbency lies between 4.6 ml and 10.6 ml.

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Compounds are made up of two or more bound elements.

Here, H2O, CO2, CH4 are Compounds.

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I know the question says [tex]5.88\times10[/tex] meters, but I'm assuming the exponent wasn't copied because the wavelength of yellow light is around eight orders of magnitude smaller. This calculation is done with the assumption that [tex]\lambda = 588 \text{ nm} = 5.88\times 10^{-7} \text{ m}[/tex].

The speed of light is the wavelength multiplied by the frequency:

[tex]\lambda\nu = \text{c}[/tex]

Then you can rearrange and solve

[tex]\nu=\dfrac{\text{c}}{\lambda}=\dfrac{3.00\times 10^8 \text{ m/s}}{5.88\times10^{-7} \text{ m}} = 5.10\times10^{14} \text{ s}^{-1} \text{ or Hz}[/tex]

Stable isotopes tend to have a very different amount of protons to neutrons because the ratio of protons and neutrons is nearly 1 or less than 1.5, whereas the number of protons and neutrons in unstable isotopes is greater than 1.5

Isotopes of elements are atoms of the same elements having the same number of protons but different numbers of protons.

Isotopes of elements may either be stable isotopes or unstable isotopes.

Stable isotopes are isotopes whose nuclei do not spontaneously decay and emit nuclear particles as well as radiation. Stable isotopes usually have a proton and neutron ratio that is less than 1 : 1.5.

Unstable isotopes are isotopes whose nuclei spontaneously decay and emit nuclear particles as well as radiation. Unstable isotopes usually have a proton and neutron ratio that is greater than 1 : 1.5.  The spontaneous decay of unstable isotopes is due to the presence of the excess neutrons in the nucleus of the atom.

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Melting ice is an example of an endothermic reaction because it absorbs heat.

When ice melt it convert into water , the phase transition from solid to liquid. In solid phase the particles are held together with strong force of attraction. when it changes to liquid , the intermolecular attraction between particles will become weak and this is due to energy is absorbed by the system. The changes takes place only when the ice absorbed heat from its surrounding. when the heat is absorbed during the reaction it is called as Endothermic reaction. while when heat is release during the reaction it is called as exothermic reaction.

Thus, The Melting ice is an example of an endothermic reaction because it absorbs heat.

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Answer: Element Sodium (Na), Group 1, Atomic Number 11, s-block, Mass 22.990. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Explanation:

Answer: The no of electron and protons are equal therefore it is equal.

Answer:

The number of electrons and protons will be equal.

Explanation:

When you have a neutral atom, the protons, neutrons and electrons are all the same amounts, that's what makes it a neutral charge.

** Hope this helps!

600grams of ping-pong balls is equal to 0.204doz of ping-pong balls.

When table tennis became a competitive sport, celluloid replaced the original primary ping pong ball material of cork as the industry standard.

Throughout the 1900s, these 38mm-diameter balls served as the industry standard for table tennis. We didn't notice a significant difference in the production of ping pong balls until the year 2000.

As we know,

1 doz of ping pong balls = 2.94×10^3 g

thus, 2.94×10^3g of ping pong balls = 1 doz

1 g of ping pong balls = 1/2.94×10^3 doz

600 g of ping-pong balls = 600/2.94×10^3 doz

= 0.204 doz

Hence, 600grams of ping-pong balls is equal to 0.204doz of ping-pong balls.

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Answer:12

Explanation:

The chemical formula is C₆H₄Cl₂, where the Chlorines are bonded to opposite sides of the benzene ring (because of steric strain) and each of the double bonded Carbons have a Hydrogen attached to them.

4 properties of metals are high melting points, good conductors of electricity, good conductors of heat, high density

Metal is the any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light

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The temperature of the system in equilibrium is 301.96 K.

The equilibrium temperature of the system depends on the heat released from both gold and water. The total heat received by the system will equal to total heat released by objects. It should follow

Q released = Q received

The heat can be defined by

Q = m . c . ΔT

where Q is heat, m is mass, c is the specific heat constant and ΔT is the change in temperature.

The given parameters are

m1 = 62.5 g = 0.0625 kg

T1 = 650 K

m2 = 165 g = 0.165 kg

T2 = 298 K

c1 = 126 J/kgK

c2 = 4200 J/kgK

Lets assume that the value of equilibrium temperature is T. Hence,

Q released = Q received

m1 . c1 . ΔT1 = m2 . c2 . ΔT

0.0625 . 126 . (T1 - T) = 0.165 . 4200 . (T - T2)

0.0625 . 126 . (650 - T) = 0.165 . 4200 . (T - 298)

5118.75 - 7.875T = 693T - 206514

700.875T = 211632.75

T = 301.96 K

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Adding deionized water into a solution containing ions will affect the electrical conductivity of the solution because the ions in the solution will be attracted to the water molecules.

Deionized water is water that has had its ions removed. This means that it will not conduct electricity.It will cause the ions to be more spread out in the solution, which will decrease the electrical conductivity of the solution. When deionized water is added to a solution containing ions, the electrical conductivity of the solution will be reduced. The reason for this is that the ions in the solution will be attracted to the water molecules, and this will reduce the number of ions that are available to conduct electricity.

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Cells in unicellular and multicellular organisms perform the tasks needed for life as unicellular and multicellular organisms have various cell functions. A multicellular organism has cells that are specialized to execute various tasks that work together to maintain the organism as a whole, as opposed to a unicellular organism that depends entirely on one cell to carry out all of its duties.

Bacteria, protists, and yeast are examples of unicellular creatures. A paramecium, for instance, is a unicellular organism with a slipper-like form that is found in pond water. Food vacuoles are organelles that are used to digest the food that is ingested from the water. In order to maintain the health of the cell and, by extension, the organism, nutrients from the food move through the cytoplasm to the nearby organelles.

Multicellular creatures have more than one cell, and groupings of cells can differentiate to perform diverse, specialized tasks. Early in a person's development, cells in the body start differentiating to become numerous types of cells, including blood cells, nerve cells, skin cells, muscle cells, and others. Under a microscope, it is simple to see how these cells differ from one another. Each type of cell adopts a specific form to best suit its function since its structure and function are related.

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Answer:

Cell phones combine phone technology with computer technology, and the pairing has made an unprecedented amount of information available to humans all over the world.

Answer:

Synthetic polymers are inexpensive to recycle.

Answer:

It's A

Explanation:

This mutation most likely affect the squirrel population : if the trait is favorable , it will be passed on to offspring over many generations, resulting in a population of darker squirrels.

Mutation can be defined as the changes in genetic material that is a change in DNA this lead to change in gene segment. mutation includes various factors such as UV light or mistakes during DNA replication . mutation leads to genetic variation in species. Mutation which offers survival advantage are favored by natural selection.

Thus, This mutation most likely affect the squirrel population : if the trait is favorable , it will be passed on to offspring over many generations, resulting in a population of darker squirrels.

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The final volume of the gas is[tex]$1184 \mathrm{~mL}$[/tex]

This problem is based on the concept of work done in a thermodynamic process.

Thermodynamics is the science which deals with heat and work and the properties of substances. It also provides a relation between heat and work.

In thermodynamics, the work done is given by

[tex]W=-P \Delta V.[/tex]......(1)

Here, W is the work done,

[tex]$\Delta V$[/tex]

is the net change in volume and the negative sign indicates that the work has been done by the system.

This equation is expanded and written as:

[tex]$$W=-P\left(V_{\text {final }}-V_{\text {initial }}\right) .......(2)$$[/tex]

Here,

is the final volume and

[tex]$V_{\text {final }}$[/tex]

is the initial volume.

Generally,

Vinitial

760 torr [tex]$=101325 \mathrm{~Pa}$[/tex]

The pressure is given as,

783torr

Convert units of pressure as follows:

[tex]$$\begin{gathered}P=\frac{101325 \mathrm{~Pa}}{760 \text { torr }} \times 783 \\=10^5 \mathrm{~Pa}\end{gathered}$$[/tex]

The volume is given as,

[tex]$72.9 \mathrm{~mL}$[/tex]

Convert units of volume as follows:

[tex]$$\begin{gathered}V_{\text {initial }}=72.9 \mathrm{~mL} \times \frac{10^{-6} \mathrm{~m}^3}{1 \mathrm{~mL}} \\=72.9 \times 10^{-6} \mathrm{~m}^3\end{gathered}$$[/tex]

A quantity can be represented in various units. These units are related to each other by some certain values. But the calculation is done only in SI units.

Hence, conversion of these units is necessary.

Work done is given is given by the equation (2).

Substitute [tex]$111.1 \mathrm{~J}$[/tex] for

as

[tex]$10^5 \mathrm{~Pa}$[/tex]

for

and

[tex]$72.9 \times 10^{-6} \mathrm{~m}^3$[/tex]

for

[tex]$V_{\text {initial }}$[/tex]

in equation (2).

[tex]$$\begin{gathered}111.1 \mathrm{~J}=-10^5 \mathrm{~Pa}\left(V_{\text {final }}-72.9 \times 10^{-6} \mathrm{~m}^3\right) \\111.1 \mathrm{Pam}^3=-10^5 \mathrm{~Pa}\left(V_{\text {final }}-72.9 \times 10^{-6} \mathrm{~m}^3\right) \\V_{\text {final }}=1\left(111 \times 10^{-6}+72.9 \times 10^{-6}\right) \mathrm{m}^3 \\=1184 \times 10^{-6} \mathrm{~m}^3\end{gathered}$$[/tex]

Hence,

[tex]$$\begin{gathered}V_{\text {final }}=1184 \times 10^{-6} \mathrm{~m}^3 \times \frac{1 \mathrm{~mL}}{10^{-6} \mathrm{~m}^3} \\=1184 \mathrm{~mL}\end{gathered}$$[/tex]

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Of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation two carbons are fully oxidized to CO₂, while four carbons remain in acetyl groups.

Pyruvate is a compound containing 3 carbon molecules formed from the first stage of glycolysis. One glucose molecule is reduced to two pyruvate molecules in the cytosol of the cell. The pyruvate then enters the matrix of the mitochondria, where pyruvate oxidation takes place.

Pyruvate oxidation is the reaction that connects glycolysis to the citric acid cycle or the Kreb's cycle. In eukaryotic cells, it occurs in the matrix of the mitochondria, but in prokaryotic cells, it occurs in the cytoplasm.

First, a carboxyl group is removed from the pyruvate. This carboxyl group is reduced to carbon dioxide (CO₂). The two-carbon molecule from the pyruvate called an acetyl is then attached to an organic compound called Coenzyme A (CoA), forming acetyl-CoA. This acetyl-CoA is the end product of pyruvate oxidation and acts as fuel for the next stage of cellular respiration, the citric acid cycle.

Thus, at the end of pyruvate oxidation, two carbon atoms of the 6 carbons in the starting glucose molecule are oxidized to two molecules of CO₂, while the remaining four carbons are in acetyl-CoA.

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p+=12   n°=14  e- =10 , The species that is represented here is ;

Mg2+.

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Percent composition of an organic compound and Empirical formula of an organic compound this information can be obtained from a combustion analysis.

The empirical formula of a compound can be determined through combustion analysis, but the chemical formula cannot be (other techniques can though). Once known, the empirical formula can be used to determine the chemical formula. Combustion analysis involves burning an organic compound that has a mixture of the elements C, H, N, and S. The mass of the combustion products is then recorded. This knowledge allows us to determine the empirical formula of the original chemical.  The empirical formula of sulfur monoxide, abbreviated SO, and disulfuric dioxide, abbreviated S2O2, are two straightforward examples of this idea. The solenoid is a particular kind of electromagnet, and its function is to produce a controlled magnetic field through a coil twisted into a compact helix. In the figure below, the solenoid is depicted. A wire coil serves as the solenoid, and a soft iron plunger serves as the piston.

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Some historians think that drinking wine from lead-glazed vases contributed to the fall of the Roman Empire.

Rome played a significant role in the history of wine. The first people to have an impact on winemaking on the Italian peninsula were the ancient Greeks and Etruscans.

Scientific advancements and an expanding understanding of winemaking were both brought about by the expansion of the Roman Empire. Rome had a significant impact on the history of today's important wine-producing regions in France, Germany, Italy, Portugal, and Spain.

Because the Romans believed that wine was a daily necessity, the beverage was "democratic" and widely available to everyone, including slaves, peasants, and aristocrats, both men and women. To ensure a consistent supply of wine for Roman soldiers and colonists, viticulture and wine production spread throughout the empire.

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Acid protonates the hydroxyls of the starting material, turning them into a better leaving group.

A salt is a compound formed when the negative ions from an acid combine with the positive ions of a base.

Neutralization is a chemical reaction between an acid and a base that takes place in a water solution, the products of which are water and salts.

NaOH (aq) + HCl (aq) → NaCl (aq) + H₂O (l)

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In this question, we have to determine the way in which an electron move from a ground state to an excited state, and the way this occurs is by absorbing energy, when the right amount of energy hits the electron, this electron will jump to a higher energy level. Therefore the answer will be the 1st option

One improvement to the filtration assembly is the presence of glass rod as glass rod  helps in negation of adhesion between glassware and the supernatent.

Filtration is defined as a process  by which solid  particles which are present in liquid or gaseous medium are allowed to be removed  using a filter medium which retains the particles but allows the liquid to pass through.

The requirements  for filtration are a filter medium ,fluid containing particles , a mechanical device usually a filter and a driving force.The filter media is classified depending on the pore size of particles which are to be filtered.

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The concentration of C is found to be 0.0739M on establishment of equilibrium using the equilibrium constant.

The ratio of the concentration of the products to the concentration of the reactants, each increased to their respective stoichiometric coefficients, is the equilibrium constant of concentration (denoted by Kc) of a chemical process at equilibrium.

Any equilibrium reaction has an equilibrium constant that is determined by the ratio of the concentrations of the chemicals on the right to the concentrations of the substances on the left. Keep in mind that the products are always listed before the reactants when writing a ratio.

Molarity of A = No. of moles / volume

Molarity of A = 0.370 / 1L = 0.370M

[tex]Kc = \frac{[C] [D]}{[A]^2}[/tex]

Kc = [tex]\frac{(x)(x)}{(0.290 - 2x)^2}[/tex] = 0.270

[tex]0.08x^2[/tex] – 0.3132x + 0.022707 = 0

x = 0.0739M

Result:

The concentration of C is 0.0739M once equilibrium is established.

The complete and correct question is in the image.

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