A coulomb is a measure of

Answer: Hello Luv.......

Find the pH of a 0.0025 M HCl solution. ... The hydronium ion concentration can be found from the pH by the reverse of the ... 8.34 = - log [H3O+].

Explanation:

Calculate the pH of the solutions below. 1. ... a) [H+] = 1.0 x 102 M OH-]= 1 x 10-2M aad ... What is the pH of a 7.98 x 10-2 M solution of HNO3 (nitric acid). ... Find the hydronium ion concentration [H3O+] from the pH of the following solutions.

Hope this helps. Sorry if wrong.

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Answer:

The heat absorbed is calculated by using the specific heat of water and the equation ΔH=cp×m×ΔT. 4. Water is vaporized to steam at 100oC. The heat absorbed is calculated by multiplying the moles of water by the molar heat of vaporization. To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in temperature

Explanation:

H2O as an oxidant only

Given

Reaction

2 Na + 2 H2O → 2 NaOH + H2

Required

The function of water in the equation

Solution

Water : oxidizing agent

Na : reducing agent

Na⁰ → Na⁺ (oxidation)

H⁺- → H⁰ (reduction)

Acids and bases according to Bronsted-Lowry

Acid = donor (donor) proton (H⁺ ion)

Base = proton (receiver) acceptor (H⁺ ion)

If water is acting as an acid it should only give 1 H +, so that becomes:

H₂O (l) ⇔ OH⁻ (aq) not H₂

Answer:

lungs

Explanation:

To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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Answer:

Reversible reaction

Explanation:

Based on the percentage composition of the bleach solution, The number of moles of NaOCl in the bleach solution is 0.00447 moles.

The mass of bleach present in the given volume of bleach solution is determined from the formula given below as follows;

Volume of solution = 5.00 mL

The density of solution = 1.111 g/mL

Mass of bleach solution = 5.0 * 1.111

Mass of bleach solution = 5.555 g

The active compound in bleach is NaOCl

Mass of NaOCl in the bleach solution = 6.00% * 5.555 g

Mass of NaOCl in the bleach solution = 0.333 g

Molar mass of NaOCl = 74.5  g/mol

Moles of NaOCl in the bleach solution = 0.333 / 74.5

Moles of NaOCl in the bleach solution = 0.00447 moles

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The volume of ammonia would be produced by this reaction 4.56mL of nitrogen were consumed is 9.13 mL of ammonia.

Volume is a unit used to describe how much space a substance or thing takes up. It is a real thing with a physical value that can be measured in liters, milliliters, cubic meters, or cubic centimeters.

The chemical equation for the reaction of nitrogen and hydrogen gases to produce ammonia gas is as follows:

N₂ + 3H₂ → 2NH₃

The balanced equation's stoichiometry states that 2 moles of ammonia are created when 1 mole of nitrogen combines with 3 moles of hydrogen. This indicates that nitrogen and ammonia have a mole ratio of 1:2.

We must first estimate how many moles of nitrogen were reacted in order to calculate the volume of ammonia created. The ideal gas law allows us to do the following:

PV = nRT, where R is the gas constant, n is the number of moles, P is the pressure, V is the volume, and T is the temperature.

We can assume that the pressure is constant and cancel it out because the gases are not contained:

V = nRT/P

The volume of 1 mole of gas is 22.4 L at standard temperature and pressure (STP), which are 0°C and 1 atm. As a result, the amount of nitrogen that reacted was:

n(N2)  = 4.56 mL × (1 L/1000 mL) × (1 mol/22.4 L) × 0.000204 moles.

As nitrogen and ammonia have a mole ratio of 1:2, the amount of ammonia produced is calculated as follows: n(NH₃) = 2 × n(N₂) = 0.000408 moles

In order to calculate the volume of ammonia produced, we can once more utilize the ideal gas law:

V(NH₃) = n(NH₃) × V(molar)= 0.000408 moles × 22.4 L/mol = 0.00913 L.

The amount of ammonia produced, rounded to three significant digits, is 9.13 mL = 0.00913 L. Hence, the answer is: 9.13 mL of ammonia.

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Answer: 2SeO2(s)+O2(g)+2H2O(l)→2H2SeO4(aq)

Explanation:

Start with the unbalanced equation by writing chemical formulas for each of the reactants and products:

SeO2(s)+O2(g)+H2O(l)→H2SeO4(aq)

Count the number of each atom on each side of the equation to determine whether the equation is balanced:

Reactants: 1 Se atom, 5 O atoms, 2 H atoms

Products: 1 Se atom, 4 O atoms, 2 H atoms

Balance the number of oxygen atoms by adding a coefficient of 2 to aqueous selenic acid on the products' side of the reaction. Then, balance the hydrogen atoms by adding a coefficient of 2 to liquid water on the reactants' side of the reaction. Finally, balance the selenium atoms by adding a coefficient of 2 to solid selenium dioxide on the reactants' side of the reaction to give the following balanced equation:

2SeO2(s)+O2(g)+2H2O(l)→2H2SeO4(aq)

The balanced chemical equation for this reaction is

\(\rm2SeO_2(s) + O_2(g) + 2H_2O(l) \rightarrow 2H_2SeO_4 (aq)\)

A balanced chemical equation is defined as a chemical reaction in which the number of atoms of each elements in the reaction and the total charge is same for both the reactants and the products.

It involves the addition of stoichiometric coefficients of the reactants and products.

Selenic acid is majorly used in protecting and changing the color of steel, especially the steel parts on firearms.

Thus, the balanced chemical equation for this reaction is

\(\rm2SeO_2(s) + O_2(g) + 2H_2O(l) \rightarrow 2H_2SeO_4 (aq)\)

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7.11 × 10⁻⁴ is the solubility (in M) of PbCl\(_2\) in a 0.15 M solution of HCl. The Ksp of PbCl\(_2\) is 1.6 x 10⁻⁵.

The capability of a material, the solute, to combine with another material, the solvent, is known as solubility in chemistry. Insolubility, or the solute's inability to create such a solution, is the opposite attribute.

The amount of each of the solute within a saturated solution—a solution whereby no more solute is able to be dissolved—is typically used to gauge the degree of a substance's solubility in a particular solvent.

PbCl\(_2\) ⇌ Pb\(_2\)⁺(x) + 2Cl⁻ (2x)

HCl ⇌H⁺ (0.15M) + Cl⁻ (0.15M)

Ksp = {Pb\(_2\)⁺} {Cl⁻}²

Ksp = {x} {2x+ 0.15}²

2x<0.15

Ksp = {x} {0.15}²

x = 7.11 × 10⁻⁴

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Answer:n a  red blood cell, the control center is the nucleus. A mitochondria is not a nucleus. It is another organelle that produces energy for the cell.

Explanation:

Answer:

Earth is not an inertial reference frame because the Earth rotates and is accelerated with respect to the Sun.

Answer:

density =mass/volume

Explanation:

p=m/v

p means raw

m means mass

v means volume.

The Voltage is the pressure from the electrical circuit of the power source that passes the current.

The Voltage is defined as the pressure from the electrical circuit of the power source that will passes the charged electrons that is the current through the conducting loop, it will enable them to do work  because of the illuminating the light. The in simple terms is : voltage = pressure, and it is denoted as the volts and the symbol is the V.

The voltage is described as the force that causes the flow of the charged particles. The Voltage is also called as the electromotive force.

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9. The specific heat capacity of the metal is approximately 0.47 J/g°C, 10. The specific heat of the metal is approximately 0.52 J/g°C.

9-To determine the specific heat capacity of the metal, we can use the formula:

q = mmetal × cmetal × ΔTmetal + mwater × cwater × ΔTwater

where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

cmetal = q/(mmetal × ΔTmetal)

q = mwater × cwater × ΔTwater = (250.0 g) × (4.184 J/g°C) × (27.2°C - 24.3°C) = 3111.8 J

mmetal = 125.0 g

ΔTmetal = 27.2°C - 100.0°C = -72.8°C

cmetal = 3111.8 J/(125.0 g × -72.8°C) ≈ 0.47 J/g°C

10- To solve for the specific heat of the metal, we need to account for the heat capacity of the calorimeter as well. The heat transferred from the metal to the water is given by:

q = (mmetal × cmetal + Ccalorimeter) × ΔT + mwater × cwater × ΔT

cmetal = (q - Ccalorimeter × ΔT)/(mmetal × ΔT)

q = (1000.0 g) × (4.184 J/g°C) × (26.5°C - 24.9°C) = 1253.44 J

Ccalorimeter = 1101 J/°C

mmetal = 750.0 g

ΔT = 26.5°C - 100.0°C = -73.5°C

cmetal = (1253.44 J - 1101 J/°C × -73.5°C)/(750.0 g × -73.5°C) ≈ 0.52 J/g°C

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The mole ratio to determine the number of moles of oxygen needed to react with 3.2 moles of C₄H₁₀ (Butane) will be 20.8 (O₂) : 3.2 (C₄H₁₀ )

It is a conversion factor between compounds in a chemical reaction, that is derived from the coefficients of the compounds in a balanced equation.

The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.

According to the given chemical equation ;

2C₄H₁₀ + 13 0₂ → 8 CO₂ + 10 H₂O

2 moles of Butane (C₄H₁₀) consumes 13 moles OF O₂ therefore, 3.2 moles butane will consumes ;

Moles of 0₂ consumed by 3.2 moles butane = 13/2 x 3.2 = 20.8

Hence, The mole ratio to determine the number of moles of oxygen needed to react with 3.2 moles of C₄H₁₀ (Butane) will be 20.8 (O₂) : 3.2 (C₄H₁₀)

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Answer:

Conduction

Explanation:

I took the course

Answer:

B. conduction

The percent by mass of the lithium in the compound is 18.78%. Option C

We know that the percentage has to do with the amount of the element that can be found in the compound. We can be able to obtain this when we  find the molar mass of the compound and then obtain the mass of the element in the compound.

Hence;

Molar mass of the compound = [2(7) + 12 + 3(16)]

= 14 + 12 + 48

= 74 g/mol

The we have the mass of the lithium in the compound as 14

Thus we then have;

Percent of lithium = 14/74 * 100/1

= 18.78%

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The mass (in grams) of fluorine gas, F₂ required to produce 219.79 grams of colbalt (ii) fluoride, CoF₂ is 86.17 grams

We'll begin by writing the balanced equation. This is given below:

CoCl₂ + F₂ -> CoF₂ + Cl₂

From the balanced equation above,

96.93 g of CoF₂ were obtained from 38 g of F₂

Now, we shall determine the mass of fluorine, F₂ needed to produced 219.79 g of colbalt (ii) fluoride, CoF₂. This is shown below::

From the balanced equation above,

96.93 g of CoF₂ were obtained from 38 g of F₂

Therefore,

219.79 g of CoF₂ will be obtain from = (219.79 × 38) / 96.93 = 86.17 g of F₂

Thus, the mass of fluorine, F₂ needed is 86.17 g

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The incorrect option woud be B, since the period number of an atom means the number of shells present around the nucleus of this element, and not the number of electrons in the innermost orbit

Answer:

x= 300m , 38s

answer is 7.9

Answer:

speed=distance/time

Explanation:

speed=300/38

=7.8947368421

to the nearest tenth=7.9

Answer:

.

Explanation:

.

Answer:

matter i think

Explanation:

matter i am pretty sure

The law that allows calories to be determined by heat (energy) transfer from one substance to another, but it is never destroyed is first law of thermodynamics.

Energy cannot be generated or destroyed, only changed in form, according to the basic law of thermodynamics.

Hence first law of thermodynamics justify the given statement.

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Answer:

247 ml

Explanation:

How many mL of 0.150 M HF solution are required to produce 0.0370 moles of HF 0.150 moles/ liter = 0.150/1000 moles/ml =0.000150 moles/ml

0.000150 x ? = 0.0370 moles HF

? = 0.0370/0.000150 = 247 ml

check

247 ml = 247/1000 L = 0.247

(0.247) x (0.150) =0.370 check

Answer:

if you are asking matter then

Explanation:

Matter is defined as anything that has mass and takes up space (it has volume).

Answer: metal turn orange and weaker as it gets oxidised

Explanation:

Answer:

The surface of earth sits on plates that move over time because of the pressure build up underneath.When the pressure releases the pressure goes through the cracks of the plates (Or Earth) pushing them apart causing earthquakes and volcano eruptions.

Explanation: Science

Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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Answer:

0.286 moles

Explanation:

i hope this is helpful for you

Answer: NH3 = 9/5    H20= 9/2

Explanation:

Mr of NH3 = 17g/mol

Mr of H20 = 18g/mol

NH3 = 30.6g divide by 17g/mol = 1.8 mol

                                                      = 9/5

H20 = 81.3g divide by 18g/mol = 4.5 mol  

                                                     = 9/2