Classify each of the following as ionic or molecular, and name each: a. fepo3 b.cl2o7 c.br2 d.ca3(po4)2 e.pcl3 f.al(clo2)3

The density of the iron, given the data from the question is 7.85 g/mL

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

The following data were obtained from the question:

The density of the iron can be obtained as follow:

Density = mass / volume

Density of iron = 15 / 1.91

Density of iron = 7.85 g/mL

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The molarity of a solution of KIO3 is dissolved in enough water to make 250.0 ml of solution is 0.1595.

Molarity is the measure of the concentration of any solute per unit volume of the solution.

M = {n}{V}

The molar mass of KIO3 is  214.001

Given the mass is 853.5 mg

First, we calculate the number of moles

moles = mass / molar mass

853.5 / 214.001 = 3.988

Now, molarity can be calculated

The number of moles is 3.988

The volume is 250.0 ml

Putting the values in the formula

M =  3.988  / 250.0 = 0.1595

Thus, the molarity is 0.1595.

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Henderson's Hasselbalch equation for the propanoic acid

[tex]solution \: is \: pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]

This is called known as the Henderson- Hasselbalch equation which relates the pH of an acid aqueous solution with the acid dissociation constant.

[tex]pH=pK _{a } + log \frac{Conjugate \: base}{acid}[/tex]

The Henderson-Hasselbalch equation is derived from the definition of the acid dissociation constant as follows.

Consider the hypothetical compound HA in water.

[tex]HA +H _{2}O→ H _{3} O ^{ + } + A^{ - } [/tex]

The acid dissociation constant of HA,

[tex] [H _3O ^{ + }] = K _a \times \frac{HA}{[A ^{ - } ] }[/tex]

[tex]log [H _3O ^{ + }] = logK_a+log\frac{HA}{[A ^{ - } ] }[/tex]

Multiply both sides of the equation by -1.

[tex]-log[H_3O ^{ + }]=-logK_a-log\frac{HA}{[A ^{-} ] }[/tex]

[tex]pH=pK _{a }+log \frac{[A ^{ - } ] }{HA}[/tex]

[tex][HA] = [A-][/tex]

[tex]pH =pKa +log1[/tex]

[tex]pH = pKa + 0[/tex]

pH=pKa

pKa value of compounds can be determined experimentally using its relation with pH.

According to the Henderson-Hasselbalch equation, when the concentrations of the acid and the conjugate base are the same, i.e when the acid is 50% dissociated, the pH of the solution is equal to the pKa of the acid.

[tex]pK _{a } \: value \: for \: propanoic \:acid \: = 4.874[/tex]

[tex]Let \: propanoic \: acid \: be \: HA.[/tex]

[tex]Let \: propionate \: be \:A ^{ - } .[/tex]

So Henderson-hasselbalch equation for the propanoic acid solution is,

[tex]pH=pK _{a } + log \frac{[A ^{ - } ] }{HA}[/tex]

[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]

Therefore, Henderson's Hasselbalch equation for the propanoic acid solution is

[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}.[/tex]

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Solid calcium carbide, cac2, reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, c2h2

CaC2(s)+2H2O(l)→Ca(OH)2(aq)+C2H2(g)

A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. All components appear as one phase in the solution.

Examples of solutions include salt water, rubbing alcohol, and sugar dissolved in water. If you mix salt and water and look closely, you will not see any salt particles and you will have a homogeneous mixture.

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After being made in glycolysis and the krebs cycle the nadh and fadh2 bring the electrons to: ATP.

NADH and FADH2 molecules formed during Glycolysis and biological processes carry their electrons to the electron transport chain. The electron transport chain creates a proton gradient that ultimately ends up in the assembly of an outsized amount of ATP.

High-energy electrons are released from NADH and FADH2, and they move along electron transport chains, like those employed in photosynthesis. because the high-energy electrons are transported along the chains, a number of their energy is captured.

Both NADH and FADH2 donate two electrons to the electron transport chain, so theoretically they must make the identical amount of ATP.

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The mass of liquid mercury that can fill glass tube is 680.365 gm.

We know that ,

Volume of cylinder = π[tex]r^{2} h[/tex]

where r is the radius of cylinder and h is the height

Here diameter of glass tube is 16mm

Thus the radius r = 8 mm

                           = 0.8 cm

Volume of glass tube = π [tex]0.8^{2}[/tex][tex]*25[/tex] [tex]cm^{3}[/tex]

Density of mercury given is [tex]13.53gm/cm^{3}[/tex]

We know that

Density =  Mass / Volume

∴ [tex]13.53gm/cm^{3}[/tex]  =  Mass/ π[tex]0.8*0.8 * 25[/tex]

Mass =  13.53 *π0.8*0.8*25

         = 680.36 gm

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Scattering occurs when particles or large gas molecules present in the atmosphere interact with and cause the electromagnetic radiation to be redirected from its original path. How much scattering takes place depends on several factors including the wavelength of the radiation, the abundance of particles or gases, and the distance the radiation travels through the atmosphere. There are three (3) types of scattering which take place.

Scattering is a term used in physics to describe a broad vary of physical processes where moving particles or radiation of some form, such as light or sound, are compelled to deviate from a straight trajectory with the aid of localized non-uniformities (including particles and radiation) in the medium thru which they pass by.

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Hydrogen bonds occur between neighboring amino acids in a secondary structure in creating alpha helices and beta pleats.

Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.

Protein is composed of amino acid linked with peptide bond, secundary structure can be α-helices and beta pleated sheet.

In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone.

Fluorine atom has greater electronegativity than oxygen atom in carbony group, so the hydrogen bond with hydrogen atom is shorter and strands are closer.

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Convincing evidence that entropy increased when the wall was removed, when the distribution of ball speeds evened out, and there was no longer a significant difference in distributions between the two boxes.

Entropy is just a measure of disorder and affects all aspects of our daily lives. If you add more energy by heating the gas, the amount of various possibilities for arranging the energy over the molecules increases.

For example, when a hot object is placed up-to-date with a chilly object, heat flows from the warmer one to the Entropy, never spontaneously from colder to hotter. If heat were to go away from the colder object and pass to the warmer one, energy could still be conserved.

The Second Law indicates that thermodynamic processes, i.e., processes that involve the transfer or conversion of warmth energy, are irreversible because all of them lead to a rise in entropy. Entropy measures what quantity thermal energy or heat per temperature.

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Answer:

The volume that a 200 g gold sample would have is 10.36 mL.

Step-by-step explanation:

In this case it is known that the density of gold is 19.3 g / mL. This indicates that in 1 mL there are 19.3 g. Then the following rule of three can be applied: if 19.3 g is contained in 1 mL, how much volume is 200 g of gold?

volume= 10.36 mL

Chlorhexidine and alexidine are: used in mouthrinses and are effective against plaque formation.

Chlorhexidine is a disinfectant and antiseptic. It is used for preventing dental plaque, treating yeast infections of the mouth and cleaning wounds.

Chlorhexidine interacts with components of toothpaste and forms salts of low solubility and antibacterial activity.

Alexidine is an antimicrobial agent, used in mouth washes as antiplaque cleaner. It is better for use than chlorhexidine because it is relatively non-toxic

Chlorhexidine and alexidine were synthesized in 1950s.

They inhibit a dental plaque formation by 70%.

Dental plaque is a biofilm of microorganisms that grows in the mouth.

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At room temperature, the halogens show all the states of matter.

Halogens are the elements of the periodic table that belong to group number 17 and are non-metals. Fluorine and chlorine are gaseous at room temperature, bromine exists as liquid, whereas iodine and astatine are solid in nature. The halogens are highly electronegative and reactive in nature.

States of matter are the physical form in which a substance can exist. There are three states of matter: solid, liquid and gas. Fluorine and chlorine have weak forces of attraction between their molecules at room temperature, hence gaseous. Bromine has little stronger intermolecular force that prevents its evaporation and hence a liquid. The molecular weight of higher halogens is large with strong forces molecular forces and hence are solids.

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The first location of chemical and mechanical digestion is the stomach. This statement is false.

Digestion is the breaking down of large insoluble food molecules into smaller water-soluble food molecules so that they can be absorbed into the aqueous plasma. In certain organisms, these small substances are absorbed from the small intestine into the bloodstream. Digestion is important for breaking down food into nutrients that the body uses for energy, growth, and cell repair that it needs to survive.

The digestive system has many forms. A basic distinction is made between internal and external digestion. External digestion evolved early in evolutionary history, and most fungi still rely on it. During this process, enzymes are secreted into the organism's environment, where organic substances are decomposed and some of the products diffuse back into the organism. Animals have a tube (alimentary canal) where internal digestion takes place. This is more efficient as more decomposition products can be trapped and the internal chemical environment can be more effectively controlled.

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The technique that is used to separate chemical mixtures by solubility is evaporation.

Solubility is defined as the process by which a substance called solute is able to dissolve in a solvent to form a solution.

Evaporation is an example of separation technique that helps in the separation of two substances based on their solubility.

Other examples of separation technique include the following:

When two substances form a solution, both can be separated into its different constituents through heating the solution in the process of evaporation.

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The atomic number of oxygen is 8. The mass number of an oxygen atom with 7 neutrons is 15.

Atomic mass is the average mass of the atom. It is measured in atomic mass units, that is Dalton. The mass number is calculated by the number of neutrons and atomic number.

The atomic number is the number of protons present in the atoms. The atomic number of oxygen is 8

The mass number can be calculated by adding those units

atomic number + number of neutrons

Mass number = 8 + 7 = 15

Thus, the mass number of an oxygen atom with 7 neutrons is 15.

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The earthquakes distributed on the map on the fault lines at edge of tectonic plates.

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Yes, it can be used for either an ion or a part of a molecule.

Ions are any atom or molecule having a net electrical charge. A proton's charge, which is generally believed to be positive, is equal to and opposite to the charge of an electron, which is supposed to be negative. It has the ability to either gain or lose one electron, allowing it to change into an ion. It can join a molecule because it can form covalent bonds with other atoms to finish a full valence shell.

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A hydrogen atom can become either an ion or a part of a molecule. It can become an ion because it can lose or gain an electron. It can become an element of a molecule because it can form covalent bonds with other atoms to gain a full valence shell.

Ions are any atom or molecule having a net electrical charge. A proton's charge, which is usually believed to be positive, is adequate to and opposite to the charge of an electron, which is meant to be negative.

It has the ability to either gain or lose one electron, allowing it to vary into an ion. It can join a molecule because it can form covalent bonds with other atoms to end a full valence shell.

Why do two hydrogen atoms combine to make a molecule?

Hydrogen has number 1. So it's one electron and 1 proton. So to finish it's octet it need one more electron. So, to become stable it forms hydrogen molecule by sharing it's electron with another H atom and thus forms a chemical bond .

Is hydrogen an ion or neutral atom?

Hydrogen is that the smallest chemical element. it's one proton and one electron, making it neutral. However, the ions of atom are charged species.

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The required force is 280 N.

We must subtract our individual forces in order to calculate the net force.

In general, whenever forces act on an object in opposite directions-the net force is equal to the difference between the two forces.

To calculate the net force, one force is subtracted from the other. therefore, here

325 N is force 1 to the right.

45 N is force 2 to the left.

Force 1 - Force 2 is the net force.

net force= 325N - 45N

net force= 280 N

So the required force is 280 N.

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The net force of the runner would be 280 N.

Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!

Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"

h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w

Sodium bicarbonate or beta-alanine used to improve anaerobic performances exert their effect on the slow rate of decrease of creatine phosphate.

Anaerobic means "with the air" and refers to the body's use of oxygen to produce energy. This typically includes exercises that last longer than 2 minutes. Continuous "steady state" exercise is done with aerobic exercise. Anaerobic means "without air" and refers to the body's ability to produce energy without using oxygen.

Examples of aerobic exercise include swimming laps, running, or cycling. Anaerobic exercise involves a rapid burst of energy and is performed with maximum effort in a short period of time. Examples include jumping, sprinting, and lifting heavy objects. "Walking is a great aerobic exercise. It's thought to be weight-bearing and good for bone strength and health," he says. Oftentimes, people feel unwell and want to lose weight and get fit, but think they need a gym membership to exercise.

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Answer:

Metals react with acids to form hydrogen gas with a pop sound and non metals do not react with acids. This is because a substance undergoing react with acids, donates electrons to the H+ ions produced by the acids. But non metals acceptor of electrons and hence they do not donate to the hydrogen ion of the acid. As a result they don't react with dilute acid but there are some exceptions.

The number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

Atomic number of an element is the number of protons in an atom of the element while the atomic mass is the sum of the protons and neutrons in the atom.

The electron number is equal to the number of protons in a neutral atom.

According to this question, the isotope of an element has an atomic number of 79 and a mass number of 200.

Therefore, the number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

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Plants promote mechanical and chemical weathering but inhibit erosion because of root

Plants can cause mechanical weathering their roots grow into rocks and crack them and when plants cause chemical weathering there roots release acid or other chemicals, onto rocks, which then forms cracks, and breaks apart. as plant roots take in nutrients, they remove elements from the minerals. This causes a chemical change in the rock but inhibit erosion because plants break up earthen materials as they take root, and can create cracks and crevices in rocks that's why they inhibit erosion

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When we half the quantities of reactants and products in a reaction, the value of the equilibrium constant remains the same.

Formula:

K = [P]/[R]

Here, [P]  is the concentration of the product.

[R] is the concentration of reactant.

[R]2= 1/2×[R]1 and [P]2 = 1/2×[P]1

K1 =  [P1] / [R1]

K2 = [P2] / [R2]

K2/K1 = [P2] / [R2]  ÷ [P1] / [R1]

K2/K1 = [P2] / [R2] x [R1] / [P1]

K2/K1= 1/2×[P]1 ÷ 1/2 [R1] x [R1] / [P1]

K2=K1 = 1/2  ÷ 1/2

K2/K1 =  1/2 x 2/1

K2 / K1 = 1

K2 = K1

Thus, the value of the equilibrium constant remains the same.

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3.45g sulfuric acid will be present in the mixture after the reaction is complete.

H₂SO₄ (aq) + Pb(CH₃COO)₂ (aq) ⇌ PbSO₄ (s) + 2 CH₃COOH (aq)

1 mole of sulphuric acid reacts with 1-mole lead(II) acetate to give 1-mole lead(II) sulfate and 2-mole acetic acid.

Mass of lead acetate reacting = 5.00g

Mass of sulphuric acid reacting = 5.00 g

Now, calculating the no. of moles of each reactant involved:

No. of moles = [tex]\frac{Given mass of substance}{Molar mass of substance}[/tex]

Moles of sulphuric acid = [tex]\frac{5.00g}{98.08g}[/tex]  

                                       = 0.510 mol

Moles of lead acetate = [tex]\frac{5.00g}{325.29g}[/tex]

                                    = 0.0158 mol

Thus,  0.0158 moles of lead acetate will react with 0.0510 moles of sulphuric acid to give 0.0158 moles of lead sulfate and 0.0158 × 2 = 0.0316 moles of acetic acid.

Therefore, only 0.0158 moles of sulphuric acid will react.

So, the remaining moles = 0.510 - 0.0158

                                         = 0.0352 mol

Remaining mass of sulphuric acid = 0.0352 × 98.08

                                                        = 3.45g

Hence, 3.45g sulfuric acid will be present in the mixture after the reaction is complete.

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Solutions of sulfuric acid and lead (II) acetate react to form solid lead (II) sulfate and a solution of acetic acid, 5.00 g of sulfuric acid, and 5.00 g of lead(II) acetate are mixed. Calculate the number of grams of sulfuric acid present in the mixture after the reaction is complete.

When phosphate is added to ADP to form the energy-storing molecule ATP, this is often often known as phosphorylation and, since water is additionally produced, this reaction is additionally considered a condensation reaction.

What are phosphorylation and condensation?

Phosphorylation could also be a condensation reaction that is important for the functioning of sugars, lipids, and proteins and is critical when it involves regulating the function of enzymes. one among the simplest phosphorylation reactions in nature is the phosphorylation of glucose which is the first step in glycolysis.

What happens when a phosphate molecule is added to ADP?

When the cell has extra energy (gained from breaking down food that has been consumed or, within the case of plants, made via photosynthesis), it stores that energy by reattaching a free phosphate molecule to ADP, turning it back to ATP. The ATP molecule is simply like a rechargeable battery.

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In the formation of ammonia, nitrogen shares three electrons in a covalent bond with three hydrogen atoms

We can see  that nitrogen has five electrons on its outermost shell. It is able to accept three electrons and share them with another atom in order to form a covalent bond.

In the formation of ammonia, nitrogen shares three electrons in a covalent bond with three hydrogen atoms to give the compound [tex]NH_{3}[/tex]. This explains why the bond that exists in the ammonia molecule is a covalent bond.

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E-mail is usually a poor choice for the distribution of sensitive electronic files because e-mail is saved on that server which transfers it.

What is E-mail?

Electronic mail, also known as email or e-mail, is a way for individuals to communicate with one another using electronic devices. At a time when "mail" solely referred to physical mail, email was therefore developed as the electronic (digital) equivalent of, or counterpart to, mail (hence the prefix e- + mail).

In many realms of business, trade, government, education, entertainment, and other aspects of daily life in most countries, an email address is now frequently seen as a vital and necessary element.Later, email developed into a ubiquitous (very popular) communication method.

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The correct answer is option a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.

Scientific knowledge is the knowledge that has been acquired and tested using the scientific method. Scientific knowledge may also comprise the observation and classification of facts to establish verifiable knowledge gained through induction and hypothesis.

A hypothesis is a proposed explanation for an event that can be tested. Hypotheses, or tentative explanations, are typically generated within the context of a scientific theory. A widely accepted, rigorously investigated and verified explanation for a collection of observations or a phenomenon is what is known as a scientific theory. The basis of all scientific knowledge is a scientific theory.

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Scientific knowledge results from the interaction of scientists who are investigating natural phenomena. Which of these ​BEST describes how a scientific explanation becomes widely accepted?

a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.

b) It is debated by the scientific community.

c) A hypothesis is tested repeatedly and the results of the tests are debated.

d) A hypothesis is tested repeatedly and the results are mostly supported by scientific investigations.