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Answer:

H3PO4 (phosphoric acid) is weak acid

Explanation:

This is because weak acid is an acid that ionizes only slightly in an aqueous solution.

a. The circulatory system in fish is one-directional while it is two-directional in humans.

b. P has a high concentration of carbon dioxide and low oxygen concentration whereas Q has high oxygen concentration and low carbon dioxide concentration.

The circulatory system is the system of organism and tissues which help to transport blood and other fluids through the body of a living organism.

The organs of the circulatory system include:

a. In the given diagram sowing the circulatory system of man and the fish, it can be seen that the direction of blood flow in the fish is one way through the heart. However, in humans, the direction of blood flow is two-way through the heart.

b. The gas in P has a high concentration of carbon dioxide and low oxygen concentration. However, the gas flowing through Q has high oxygen concentration and low carbon dioxide concentration.

In conclusion, the circulatory system is important in the exchange of gases in the body.

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Explanation:

composition and interaction of matter included in the study of chemestry

Answer:

1.18 x 10⁵

Explanation:

3.14 x 10⁻² / 2.65 x 10⁻⁷ = 1.18 x 10⁵

When performing division, the final answer should have the same number of significant figures as the number with the smallest number of sig figs. In this case, both of the given numbers have 3 sig figs, meaning the final answer should have this many as well.

Once balanced, the coefficient of HCl in the following reaction: Mg + HCl → MgCl2 + H2 is 2 (option B).

A chemical reaction is said to be balanced when the number of moles of each atom of an element on both sides of the equation is the same.

According to this question, magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen gas as follows:

Mg + HCl → MgCl2 + H2

However, to balance the equation, we make use of coefficients, which are numbers placed in front of a compound to make the number of moles of atoms equal.

The balanced equation is as follows:

Mg + 2HCl → MgCl2 + H2

Therefore, once balanced, the coefficient of HCl in the following reaction: Mg + HCl → MgCl2 + H2 is 2.

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(i) Make ammonia number of atoms on reactant side is 8 and on product side is 8. (ii) Separate water number of atoms on reactant side is 6 and on product side is 6. (iii) Combust methane number of atoms on reactant side is 9 and number of atoms on product side is 9.  

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

(i) Make Ammonia

First we have to write the balanced chemical equation

             N₂ + 3H₂ → 2NH₃

Reactant side              Product side

N = 2                             N = 2

H = 6                             H = 6

So total number of atoms on product and reactant side is 8.

(ii) Separate Water

First we have to write the balanced chemical equation

            2H₂O → 2H₂ + O₂

Reactant side              Product side

H = 4                             H = 4

O = 2                             O = 2

So total number of atoms on product and reactant side is 6.

(iii) Combust methane

First we have to write the balanced chemical equation

       CH₄ + 2O₂ → 2H₂O + CO₂

Reactant side              Product side

C = 1                             C = 1

H = 4                            H = 4

O = 4                            O = 4

So total number of atoms on product and reactant side is 9.

Thus from the above conclusion we can say that For each balanced reaction, the total number of atoms are

Reaction                            Total number of atoms

                                     Reactant side           Product side

Make Ammonia                   8                               8

Separate Water                   6                               6

Combust Methane              9                               9

Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: For each balanced reaction, indicate the total number of atoms in the table below.

Reaction                            Total number of atoms

                                     Reactant side           Product side

Make Ammonia            _________              __________

Separate Water            _________              __________

Combust Methane       _________              __________

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Answer:

C.) [tex]K = {[CO_{2} ]^{2} [H_2O] }[/tex]

Explanation:

The general equilibrium expression looks like this:

[tex]K = \frac{[B]^b[C]^{c} [D]^{d} }{[A]^{a}} }[/tex]

In this expression,

-----> K = equilibrium constant

-----> uppercase letters = formulas

-----> lowercase letters = balanced equation coefficients

Solids are not included in the expression, so Ca(HCO₃)₂(s) and CaO(s) should be left out. The products should be in the numerator and the reactants are in the denominator. This makes the expression:

[tex]K = \frac{[B]^b[C]^{c} [D]^{d} }{[A]^{a}} }[/tex]                                  <----- Equilibrium expression

[tex]K = {[CO_{2} ]^{c} [H_2O]^{d} }[/tex]                             <----- Insert gaseous formulas

[tex]K = {[CO_{2} ]^{2} [H_2O] }[/tex]                               <----- Insert coefficients

Answer:

SO2(g) + O2(g) SO3(g) (needs to be balanced. Balance it by placing a 1/2 in front of the 02.) This is a 5-sig-fig problem, so when you calculate your molar masses, you must use all of the sig figs available to you from the periodic table. That's how you can get this problem correct. Melissa Maribel likes to round the numbers from the periodic table, and usually that is ok. But for problems where you have many sig figs, your molar masses from the periodic table must have at least as many sig figs as your data. Therefore, for each oxygen atom, please use 15.9994 g/mol. For each sulfur atom, please use 32.066 g/mol. Thank you.

Answer:

7.1029 gms of O2

Explanation:

First balance the equation to get

2 SO2  + O2 ====>  2 SO3

Mole weight of sulfur dioxide gas

 S   +   2 O  ==   32.066 + 2 * 15.999   = 64.064 gm/mole  ( 5 signif digits)

     28.442 gm / 64.064 gm/mole = .44396 mole  of SO2 ( 5 sig digits)

From the balanced equation, you can see you need 1/2 as many moles of O2   as  SO2:

mole weight of O2  =   2 * 15.999 = 31.998 gm / mole   ( 5 sig digits)

   now you need    1/2  of  .44396 moles of this

              1/2  * .44396  * 31.998 = 7.1029  gm    ( 5 sig digits)

Fatty acids are the building blocks of the fat in our bodies and in the food we eat.

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The pH of the solution when no base is added is 0.424.

An aqueous solution's acidity or basicity can be determined using the pH scale. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.

The chemical formula of hypochlorous acid is HClO.

1 mole of HClO produces 1 mole of hydrogen ions and 1 mole of fluoride ions.

KOH (aq) + HClO (aq) → KClO (l) + H2O (l)

To calculate the pH of the solution when no base is added, we use the equation:

[tex]p_{H} = - log {H}^{+}[/tex]

We are given:

[tex]H^{+} = 0.376 M[/tex]

Putting values in the above equation, we get:

[tex]p_{H} = - log (0.376)[/tex]

[tex]p_{H}[/tex] = 0.424

Hence, the pH of the solution when no base is added is 0.424

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D. The option that is NOT an example of a colligative property is salt water dehydrates someone that drinks it.

Colligative properties are the physical changes that result from adding solute to a solvent.

Colligative Properties depend on how many solute particles are present as well as the solvent amount, but they do NOT depend on the type of solute particles, although do depend on the type of solvent.

One important thing to note is that colligative property is going to change the melting point or the boiling point of a substance.

Thus, the option that is NOT an example of a colligative property is salt water dehydrates someone that drinks it.

The correct option is D.

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Hydrochloric acid would best be described as a Arrhenius acid, Lewis acid and Brønsted-Lowry acid (option B).

Arrhenius acid is any substance that dissociates in an aqueous solution to form hydrogen ions (H+) or proton.

On the other hand, a Brønsted-Lowry acid is any substance that can donate a proton or hydrogen ion to another substance.

Hydrochloric acid (HCl) can be categorized as an Arrhenius acid and Brønsted-Lowry acid because it has the ability to donate H+ and increase the hydrogen ion concentration of an aqueous solution.

Also, Lewis cids are the chemical substances that are able to accept electron pairs.

Therefore, Hydrochloric acid would best be described as a Arrhenius acid, Lewis acid and Brønsted-Lowry acid.

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The amount of NaOH by mass the jar contains will be 183.2 g

The percent by mass of NaOH in the oven-cleaning solution is 40.0%.

This means that for every 100 g of the cleaning solution, there would be 40 g of NaOH.

Now, the jar in question contains 458 g of this solution which is 40.0% NaOH by mass.

The amount of NaOH in the jar can be calculated as:

             40/100 x 458 = 183.2 g

This means that 458 g of the oven-cleaning solution that is present in the jar contains 183.2 g of NaOH.

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Answer:

80 ml

Explanation:

Moles to start =  .04 L * .6 M/L = .024 moles

   this is how much must be in the final dilution

         .2 moles / liter * x liter  = .024 moles

                x = .024 / .2 = .12   liter final volume

           start with   . 040    then add .080   to get .12 liter

  .080 liter = 80 ml

Answer:

D.) reducing agent

Explanation:

Oxidized chemicals gain electrons. In order to gain these electrons, another chemical must lose electrons. So, the chemical (which will be oxidized) acts as a reducing agent, causing the other chemical to be reduced and lose electrons.

Answer:

No.

Explanation:

HI is more polar than HF

Answer:

1.) aqueous lithium sulfate + aqueous calcium iodide ---> aqueous lithium iodide + solid calcium sulfate

2.) Li₂SO₄ (aq) + CaI₂ (aq) ------> 2 LiI (aq) + CaSO₄ (s)

Explanation:

This appears to be a double-displacement reaction. In these reactions, the cation of one compound swaps with the cation of another.

Therefore, lithium swaps with calcium. The new products are lithium iodide (LiI) and calcium sulfate (CaSO₄). Lithium iodide is soluble in water, whereas calcium sulfate is generally not.

The word equation (including the states of matter):

aqueous lithium sulfate + aqueous calcium iodide ---> aqueous lithium iodide + solid calcium sulfate

An equation is balanced when there is an equal amount of each element on both sides of a reaction. If these amounts are unequal, you can add coefficients to modify the quantities of particular molecules.

The unbalanced equation:

Li₂SO₄ (aq) + CaI₂ (aq) ------> LiI (aq) + CaSO₄ (s)

Reactants: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine

Products: 1 lithium, 1 sulfur, 4 oxygen, 1 calcium, 1 iodine

The balanced equation:

Li₂SO₄ (aq) + CaI₂ (aq) ------> 2 LiI (aq) + CaSO₄ (s)

Reactants: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine

Products: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine

Answer:

6 bonding electrons are needed.

The equilibrium constant, k of the reaction in which case, the concentrations of the given reactants and products are as indicated is; Choice A; K = 3.1 x 10⁵

It follows from above that the concentrations of the reactants and products are as follows; [H2] = 0.10 M, [N2] = 0.10 M, and [NH3] = 5.6 M at equilibrium.

Hence, the equilibrium constant of the reaction in discuss is;

K = [5.6]²/[0.10]³[0.10]

k = 5.6² × 10⁴

k = 3.136 × 10⁵

K = 3.1 × 10⁵.

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If there was an inverse relationship between the temperature and the volume, our daily lives change because in high temperature things will contract.

If there was an inverse relationship between the temperature and the volume then with increasing temperature decrease occur in the volume of a substance. If this type of relationship is present in the world, the objects will contract when the temperature is high and expand when the temperature is low which make the solid materials expand at winter and contract at summer season.

So we can conclude that if there was an inverse relationship between the temperature and the volume, our daily lives change because in high temperature things will contract.

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Answer:

B.) Adhesion

Explanation:

A.) is incorrect. Viscosity is a measure of internal friction that affects the fluidity of a liquid.

B.) is correct. Adhesion is the ability of water to stick to other substances (which are not water).

C.) is incorrect. Surface tension is the tension created by the bonds of the surface particles.

D.) is incorrect. Density is a ratio that compares mass to volume.

Answer: [tex]\Large\boxed{m=8.5~g}[/tex]

Rounded to the nearest 2 significant figures

Explanation:

Given information

Volume of Solution = 417 mL

Molarity of Solution = 0.327 M (mol / L)

Given molecular weight

Mg (Magnesium) = 24 g / mol

F (Flourine) = 19 g / mol

Total Weight (MgF₂) = 24 + 2 × 19 = 62 g /mol

Given formula

m = V × M × n

Convert the unit of volume to Liter

1 L = 1000 mL

417 mL = 417 / 1000 = 0.417 L

Substitute values into the given formula

m = (0.417) × (0.327) × (62)

Simplify by multiplication

m = 136.359 × 62

[tex]\Large\boxed{m=8.5~g}[/tex]

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Answer:

13.0 L

Explanation:

To find the volume, you need to use the Ideal Gas Law:

PV = nRT

In this equation,

-----> P = pressure (kPa)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas constant (8.314 kPa*L/mol*K)

-----> T = temperature (K)

After converting the temperature from Celsius to Kelvin, you can plug the given values into the equation and simplify to find "V". The final answer should have 3 sig figs to match the sig figs of the given values.

P = 855 kPa                                  R = 8.314 kPa*L/mol*K

V = ? L                                           T = 26.0 °C + 273.15 = 299.15 K

n = 4.47 moles

PV = nRT

(855 kPa)V = (4.47 moles)(8.314 kPa*L/mol*K)(299.15 K)

(855 kPa)V = 11117.48496

V =  13.0 L

Answer:

copper - 52 (or Cu - 52)

⁵²Cu

Explanation:

Isotopes are different atoms of the same element that differ in the number of neutrons. Therefore, you can determine which element this is by examining the number of protons. All atoms with 29 protons are copper (Cu).

The mass number is the total number of protons and neutrons in an atom. Therefore, the mass number of this isotope is 52 (29 + 23 = 53). When writing an elemental symbol, the mass number is found on the top left.

As such, the name of this isotope is copper - 52 (or Cu - 52) and the symbol is ⁵²Cu.

Answer:

1.33 x 10¹⁵ Hz

Explanation:

You can find the frequency using the following equation:

f = c / λ

In this equation,

-----> f = frequency (Hz)

-----> c = speed of light (3.0 x 10⁸ m/s)

-----> λ = wavelength (m)

Before we can plug the values into the equation, we need to convert the wavelength from nm to m.

 225 nm                 1 m
----------------  x  --------------------  =  2.25 x 10⁻⁷ m
                           1 x 10⁹ nm

f = c / λ

f = (3.0 x 10⁸ m/s) / (2.25 x 10⁻⁷ m)

f = 1.33 x 10¹⁵ Hz

The frequency of a wave can be calculated using the wavelength and and speed of light. The frequency of a wave with 225 nm is 1.33 × 10¹⁵ Hz.

Frequency of a wave is the number of wave cycles per second. It mathematically taken as the inverse of time taken to travel and it have a unit of s⁻¹ other than Hz.

The wavelength of an electromagnetic wave is the distance between two consecutive crests or troughs.Wavelength and frequency are in inverse relationship. For a longer wavelength the frequency will be lower.

Higher frequency waves are more energetic than longer wavelengths. Thus energy and frequency are in direct proportion

It is given that the wavelength of the electron is 225 nm. Consider the electron behaving as wave and the frequency v can be calculated using the speed of light c as follows:

[tex]v = C/\lambda[/tex]

  = (3 ×10⁸ m/s) /(225 ×⁻⁹ m)

   = 1.33 × 10¹⁵ Hz.

Hence, the frequency of an electron with a wavelength of 225 nm is 1.33 × 10¹⁵ Hz.

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Answer:

40 ml

Explanation:

boyles law

Pi Vi = PƒVƒ

4 * 20 = 2 * Vƒ

40 ml = Vƒ

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The maximum allowable annual dose of radiation has been set at 1000 uSv by the worldwide commission on radiological protection. At this threshold or lower, there is no risk.

What is S(sievert)?

Here are some details concerning the risks increasing radiation levels cause to our health:

Therefore the correct choice is an option (A).

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Answer:

Answer D

Explanation:from founders Edtell :

A dose of 1000 uSv is believed to carry a 1/100,000 risk of getting cancer over 40 years due to your exposure to radiation. The average dose is around 2400 uSv.

Answer:

Empirical Formula = MgO

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Explanation:

Elements = Mg O

Mass/ 0.6g/ 0.4g/

RAM 24 16

= 0.025 0.025

Divide by

the smallest = 0.025/ 0.025/

value. 0.025 0.025

Mole ratio = 1 : 1

Empirical Formula = MgO