The model shows the first three periods of the Periodic Table. Which statement BEST describes the trend in the number of protons and valence electrons across a period?
A. Across a period, elements gain a proton and lose a valence electron.
B. Across a period, elements gain a proton and gain a valence electron.
C. Across a period, elements lose a proton and gain a valence electron.
D. Across a period, elements lose a proton and lose a valence electron.

Compounds are made up of two or more bound elements.

Here, H2O, CO2, CH4 are Compounds.

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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!

Omar is facing a problem with money.

Businesses typically use earnings and revenue to describe their financial performance over a period of time. Profit and turnover are the two most valuable numbers in a company's financial statements.

Revenue is the total money a company earns from the sale of goods and services. Income is called the top line because it is at the top of the company's income statement, which also refers to the company's gross sales. Income is the income received before expenses are deducted. Turnover is also called turnover in some companies, because turnover includes potential returns from customers.

Profit, on the other hand, reflects the bottom line of the income statement and is the profit the company earned during the period. The profit indicator is entered in the net result of the profit and loss statement. When investors and analysts talk about a company's performance, they are talking about the company's net income or earnings.

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Answer:

Synthetic polymers are inexpensive to recycle.

Answer:

It's A

Explanation:

Each atom has a wide range of potential electron transitions. There is a distinct energy differential for each transition. An emission spectrum is made up of these transitions. Similar to how fingerprints are unique to individuals, these emission spectra are to each element.

What is  emission spectrum?

The electromagnetic radiation spectrum produced when an electron changes from a high energy state to a lower energy state is known as the emission spectrum of a chemical element or chemical compound. The energy difference between the two states is equal to the photon energy of the emitted photon.

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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:

53

Explanation:

Iron has atomic number of 26

so mass number is 26 + 27 = 53

Iron atoms contain 27 neutrons. It has a mass of 53.

Therefore,

Mass number= no. of proton + no. of neutrons

Atomic number= no. of proton = 26

Mass number = 26+27

= 53

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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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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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Plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.

Plasmas is defined as a type of substance in which numerous electrons freely roam around the nuclei of the atoms.

Plasma has been referred to as the fourth state of matter, alongside solid, liquid, and gas.

When one or more electrons are ripped from an atom, they form a plasma.

Thus, plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.

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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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Answer: Gains an extra electron in 2p orbitals it's option Y (1s²,2s², 2p⁶

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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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 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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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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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]

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

Mg2+.

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Phenol has a molar mass of 94.11 g/mol.It is an active ingredient in many oral anesthetics that is used in sore throat sprays.

To calculate molar mass the following steps must be followed:

1) Divide the molar mass of phenol by the molar mass of carbon. This will give you the number of moles of carbon in phenol.

2) Add the number of moles of carbon to the number of moles of hydrogen. This will give you the total number of moles in phenol.

3) Multiply the total number of moles by the molar mass of carbon.

This will give you the molar mass of phenol.

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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.

The entropy of mixing of nitrogen and oxygen gases of mole fractions of 0.78 and 0.22 respectively is -4.34 J  and the molar Gibbs energy of mixing is - 1295.7 J. Negative sign of Gibbs energy indicates that the reaction is spontaneous.

A spontaneous reaction is the one which occurs naturally  without any urge or external factor or force. Spontaneity of a reaction can be determined from the Gibbs energy of the reaction. If Gibbs energy is negative then, the reaction is spontaneous and if positive reaction will be non- spontaneous.

Entropy of mixing is calculated using the mole fractions of the two gases Xa and Xb as written as follows:

ΔSmix =  R (Xa in Xa + Xb in Xb).

Where R is the universal gas constant equal to 8.314 J/(K mol)

We have the mole fraction of nitrogen and oxygen in the reaction. Apply these values to the equation as follows:

ΔSmix  = 8.314 (0.78 ln 0.78 + 0.22 ln 0.22)

            = -4.34 J

Molar gibbs energy of mixing  =  RT (Xa in Xa + Xb in Xb).

Thus ΔGmix = TΔSmix

                     = 298 K × -4.34 J

                     = -1295.7 J.

Therefore, the reaction of mixing of nitrogen and oxygen is spontaneous.

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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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Answer:

Explanation:

The only option that would have 6 moles is 67.2 L

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

Answer: It could help them navigate on a ship

Explanation:

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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