the ph of saliva is normally in the range of 6.4 to 7.0. however, when a person is ill, the person's saliva becomes more acidic. (a) when marco is sick, he tests the ph of his saliva and finds that it is 6.1. what is the hydrogen ion concentration of his saliva? (round your answer to seven decimal places.) m (b) will the hydrogen ion concentration in marco's saliva increase or decrease as he gets better? increase decrease (c) after marco recovers, he tests the ph of his saliva, and it is 6.5. was the saliva more acidic or less acidic when he was sick? more acidic less acidic

Answer:

C.. Group I element they dissolve in water to form alkaline solution

B.. Element between group II and III and most of them form coloured compound

A... Group VII element they react with metals to form salts

5p subshell of the indium atom ground state experience the lowest effective nuclear charge (Z or Zeff)

Atomic number of indium = 49

E.C of indium = [Kr]4d¹⁰5S²5p¹

The outer 3 electrons indicate that indium is a 3rd group element

In the ground state, the outer electrons of In are present in the 5s and 5p orbitals

So among 5s and 5p which will experience the lowest nuclear charge (Zeff)

The nuclear charge depends on the shape of the orbital

5s has spherical shape while 5p has DB shape

Among the spherical and DB shape, the second one experiences the lower nuclear charge.

So the answer is 5p subshell of the indium will experience the lowest effective nuclear charge (Z or Zeff)

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Answer:

Radio Waves are used for cell phone communication.

Buffer solutions are used to calibrate pH meters because they resist changes in pH. When you use a pH meter to measure pH, you want to be sure that if the meter says pH = 7.00, the pH really is 7.00. So you use solutions of known pH and adjust the meter to display those values.

What is buffer solution

When modest amounts of an acid or an alkali are introduced, the pH of a buffer solution will not change.

solutions for buffering acid

However the concentrations were, as long as they were the same, it wouldn't matter.

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Polyvinyl chloride (PVC) is mostly used for cable jackets.

PVC cable jackets can withstand heat, sunlight, weathering, oils, acid, and physical abrasion, making them an excellent choice for outdoor cable jackets. It is a thermoplastic material.

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The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.

The reaction takes place when the borax is added to the solution. when we add the borax in the solution the glue and the borax will combine and form the new substance that is flexible and the springy. The physical properties like strength, flexibility and the viscosity would change.

Thus, The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.

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The oxygen molecule is 16 times heavier than the hydrogen molecule. So, the answer is false. The molar mass of gases decide the mass of the gases.

What is molar mass?

Molar mass is the mass of the substance divided by the number of moles of that substance. The SI unit of molar mass is Kg/mol. It is an intensive property. It is the mass of the substance in 1 mole of that substance.

The molar mass of hydrogen molecule (H2) is 2 g/mol. The molar mass of oxygen molecule (O2) is 32 g/mol. The oxygen molecule is heavier than hydrogen molecule.

Therefore the oxygen molecule has a molar mass of 32 g/mol which is 16 times more than the molar mass of hydrogen molecule which is 2 g/mol. The answer is false.

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Answer:

how are you doing, please kindly help me with my homework

A 355-ml can of soda pop contains 41 g of sucrose the molarity of the solution with respect to sucrose is 0.337 M

Given that 41g of sucrose

Number of moles = amount in g/ molar mass

Number of moles= 41 g / 342.2965 g/mol

Number of moles= 0.12 moles Sucrose

Volume = 355 ml or 0.355 L

Thus,

Molarity = 0.12 moles / 0.355 L

Molarity= 0.337 M

The term "molarity of the solution" refers to how many moles of solute there are in a liter of solution. M served as its symbol. The ratio of moles of solutes per liter of solution is known as the molarity of any solution. The following formula captures it.

Molarity (M) = moles of solute/liter of solution

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Answer:

Explanation:

[He]2s²2p⁶

When a nucleus emits a positron its atomic number decreases by 1

When a nucleus emits a beta particle means positron and its atomic number decreases by 1 and its mass number remain unchanged and a proton and electron combine to form a neutron and the mass number stay the same but the atomic number decreases by 1 and very few nuclides undergo this transformation and a proton in the parent nucleus decay into a neutron that remain in the daughter nucleus and the nucleus emit a neutrino and a positron and which is a positive particle like ordinary electron in mass but of opposite charge

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The following molecules has an atom with an incomplete octet is BF₃.

the following molecules given as follows :

a) NF₃ - it follow the octet rule. all the atom present have there octet complete. the molecule is stable;

b) H2O - all the have complete octet.

c) AsCl₃ - all the atoms have 8 electron in valence shell and follow octet rule.

d) GeH₄ - thos molecule also follow the octet rule

e) BF₃ - not follow the octet and have incomplete octet. Boron atom have in complete octet.

thus, The following molecules has an atom with an incomplete octet is BF₃.

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Answer:

because ethanol is polar

Explanation:

polar dissolves in polar. Ethanol has a hydroxyl(-OH) functional group in it.

Due to the presence of a bond between electronegative atom oxygen and hydrogen, the O-H bond acquires polarity.

Hence, due to the presence of polarity in O-H bond, it forms a Hydrogen bond with water which is responsible for the responsibility of ethanol in water.

Answer:

NH3 is the limiting reactant; 51 g of excess reactant left over.

Explanation:

First, create the chemical equation for this reaction and balance it:

4NH3 + 5O2 ---> 4NO + 6H2O

Then, find the limiting reactant, but in this case using NH3:

75 g NH3 * 1mol NH3/17.04 g NH3 *  5 mol O2/4 mol NH3 * 18.02 g 02/ 1 mol O2 = 99.14 g O2 needed

Since 99.14 g of O2 is needed to react with 75 g of NH3, this means O2 is the excess reactant, since we have 150 g of O2 which is more than needed. This means that NH3 is the limiting reactant.

To find the mass of excess reactant left over, subtract the mass of O2 needed (99.14 g) from the mass used in the reaction (150 g).

150 g - 99.14 g = 50.858 g

Round to the appropriate number of sig figs:

50.858 g --> 51 g

Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :

2NH₄I   +   , Pb(CH₃COO)₂   ---->  PbI₂   +   2NH₄CH₃CO₂

The ammonium iodide, NH₄I react with lead (ii) acetate, Pb(CH₃COO)₂ to form lead(II)iodide and ammonium ethanoate.  The balanced equation is given as follows :

2NH₄I        +       Pb(CH₃COO)₂   ---->  PbI₂   +        2NH₄CH₃CO₂

ammonium      lead (ii) acetate        lead(II)iodide    ammonium ethanoate

iodide

Thus, Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :

2NH₄I   +   , Pb(CH₃COO)₂   ---->  PbI₂   +   2NH₄CH₃CO₂

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Bases that are useful for deprotonating compounds are:

NaHCO₃ or NaOH.

metal alkoxide

Sodium hydroxide

Benzene rings with carboxylic acids that are weak acids can be prepared using NaOH or NaHCO 3 due to the weakness of the carboxylic acid. deprotonated.

Metal alkoxides such as potassium tert-butoxide can be used to deprotonate benzene rings with three carbon chains attached to one carbon. Also, metal alkoxides are used because the benzene ring containing the hydroxyl group is a very weak acid.

A benzene ring with a hydroxyl group is a weak acid like a benzene ring with a carboxyl group, so it can be deprotonated with NaOH.

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Only 1 atom of chromium is present in one formula unit of sodium chromate (option C).

A chemical compound is a substance formed by the union of two or more chemical elements in a fixed ratio, the union being a chemical bond.

A chemical formula, which is a notation indicating the number of atoms of each element present in a compound, shows the type and number of atoms of elements in a compound.

According to this question, a chemical compound named sodium chromate (Na₂CrO₄) is given. This chemical formula shows that only one atom of chromium is present in the compound.

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Answer:

D. 4 atoms

Explanation:

The term chemical weathering is said to occur when water reacts with carbon dioxide to produce carbonic acid, weakening the rock.

The term weathering has to do with the breaking down of the rock. Now we know that rocks are defined as the solid part of the earth's crust. We can find the rocks either at the surface or under the earth.

The process of the breakdown of the rocks can be initiated by many processes and one of the processes is by the break down of  the rock by the hydrolysis of the minerals that can be found in the rock. This owes to the formation of acid in the rocks.

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12 moles of H₂ need to produce 8 moles of NH3 if you have plenty of N₂ .

What is a chemical reaction ?

Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.

Chemical reactions are  part of technology, culture, life . Fuel combustion, glass and pottery making, beer , and wine and cheese making are few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes occurring in the Earth's geology, atmosphere and oceans, and in all biological systems.

The balanced chemical equation is:

N2+3H2→2NH3

From stoichiometry,

2 mol of NH3

is produced from 3 mol of H2

8 mol of NH3 will be produced from = 3/2×8=12 mol of H2

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This is a balanced chemical reaction equation since the number of atoms of each of the elements is the same on both sides of the reaction equation.

We know that the term chemical reaction has to do with the kind of interaction that does occur between reactants and products. In this case, we have the reaction that exists between methane and oxygen. This is a combustion reaction.

There is one carbon atoms on the reactant side and one carbon atom on the products side. There are four hydrogen atoms of the reactants side and fur hydrogen atoms on the products side. There are four oxygen atoms on the reactants side and four oxygen atoms on the products side.

There are two oxygen molecules on the reactants side and there are two water molecules on the products side. This is a balanced chemical reaction equation.

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The pH of 10 g dm -3 HCL​ is 3. The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality.

Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

Hydrogen potentials are what PH stands for. It speaks of how many hydrogen ions are present in a solution. This serves as a gauge for the acidity or alkalinity of a solution. On a pH scale, the pH value ranges from 0 to 14.

A solution's pH is a significant indicator of its chemical composition. The pH may affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.

[ H⁺ ] = 10 − 3 M,

pH = − log [ 10 − 3 ],

pH = 3.

Thus, The pH of 10 g dm -3 HCL​ is 3.

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Answer:

All forms of hydroxides

Explanation:

The metals in Group IA (Li, Na, K, Rb, Cs, and Fr) are called alkali metals because they all form hydroxides (such as NaOH) that were once known as alkalies. The electron configurations of the alkali metals are characterized by a single valence electron.

The estimated nuclear charge on an electron in a 30 orbital of chlorine atom is 6.1

The charge that the outermost valence electrons of any many-electron atom experience is known as the effective nuclear charge. This is done by taking into account how many shielding electrons there are surrounding the nucleus. Rule of Slater: The effective nuclear charge that an electron in a multi-electron atom experiences is measured using this method. This rule states that the screening effect of the other electrons in the atom causes the actual nuclear charge an electron experiences to be smaller than the actual nuclear charge. An atom's distribution of electrons within its atomic orbitals is known as its electronic configuration.

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The organic analytical technique that is paired with the visible spectrum and cannot confirm a substances identity is Spectrophotometry.

What is Spectrophotometry?

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Answer: Active transport goes against the gradient causing it to use ATP (energy) unlike diffusion which uses passive. Two types of diffusion are simple diffusion and facilitated diffusion, whereas two types of active transport are primary and secondary active transport.

Explanation: Active energy uses more energy to function rather than diffusion which has multiple types causing it to be different from active transport. Hope this helps!!

Because of Avogardo Hypothesis, volumes can be used in gas phase reaction stoichiometry at constant temperature and pressure.

Avogadro's Law (also known as Avogadro's Hypothesis or Avogadro's Principle) is an experimental gas law that relates the volume of gas to the amount of gaseous matter present.

Avogadro's law states that "equal volumes of all gases at the same temperature and pressure have the same number of molecules". At constant temperature and pressure, (mol) of a gas is directly proportional.

For example, if two ideal gases, hydrogen and nitrogen, are mixed in equal amounts, they contain the same amount of molecules. This only happens if they are kept at the same pressure and temperature. This shows the ideal behavior of gases.

Let's look at this law mathematically: the overall law can be written as

V is directly proportional to n

or V = nK , K (a constant)

Amount of gas; “n” is the gaseous substance measured in moles. "k" is a constant defined for a specific pressure and temperature.

Comparing the same gas under different conditions, the law is : V₁/ n₁=V₂/ n₂

The equation shows that the number of moles of gas increases in proportion to the increase in gas volume. Therefore, the total number of atoms or molecules present in a given volume of gas is completely independent of the molar mass or size of the gas.

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The spot with the lowest Rf value would be the most polar one and, thus, the one that is least soluble in the stationary phase.

Does more polarity indicate a higher or lower Rf value?

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26.21g NaNO₂ is added to it to make a buffer with a pH of 3.46.

A buffer solution's pH will not change when a small amount of an acid or an alkali is added.

A buffer solution that is acidic has a pH lower than 7, to put it simply. Acidic buffer solutions are usually made by mixing a weak acid with one of its salts, usually sodium salt.

A buffer solution with an alkaline pH exceeds 7. Alkaline buffer solutions are often made by mixing a weak base with one of its salts.

moles of HNO₂ = 24.52g HNO₂ ×[tex]\frac{1 mol HNO2}{47.013gHNO2}[/tex]

moles of HNO₂ = 0.33 moles HNO₂

pKa for HNO₂,  

pKa = -log(Ka)

pKa = -log(4.0 × 10⁻⁴)

pKa = 3.39

Now, By using the Henderson-Hasselbach equation: determine the moles of NaNO₂.

Hence, both compounds (Weak base and acid) have same volume.

also use moles instead of concentrations:

pH = pKa + log ( [tex]\frac{moles NaNO2}{moles HNO2}[/tex])

moles of NaNO₂ = moles of HNO₂ × 10[tex]^{pH-pKa}[/tex]

moles of NaNO₂ = 0.33 moles × 10³°4⁶⁻³°³⁹

moles of NaNO₂ = 0.38 moles

moles of NaNO₂ to grams of NaNO₂,

= 0.38 × (68.99/1)

= 26.21g NaNO₂

amount of NaNO₂ is 26.21g.

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Answer:

3.32%

Explanation:

To calculate the percent error, you need to use the following equation:

                             | measured value - actual value  |
Percent Error  =  --------------------------------------------------  x  100%
                                              actual value

In this equation, the measured value is the amount generated after running an experiment. The actual value is the amount generated solely through calculations.

Measured Value = 233 mL

Actual Value = 241 mL

                             |  233 mL - 241 mL  |
Percent Error  =  --------------------------------  x 100%
                                        241 mL

                                 8 mL
Percent Error  =  -----------------  x  100%
                                241 mL

Percent Error  =  0.0332  x  100%  =  3.32%