Which statement describes a way electromagnetic waves are different from
mechanical waves?
A. Electromagnetic waves can travel only through matter.
B. Electromagnetic waves can carry energy over a distance,
0 0
C. Electromagnetic waves can transfer matter through empty space.
D. Electromagnetic waves can travel through empty space,

Answer:

[H₃O⁺] = 2.5 × 10⁻¹⁰ M

pH = 9.6

Explanation:

Step 1: Given data

Concentration of OH⁻ in the solution ([OH⁻]): 4.0 × 10⁻⁵ M

Step 2: Calculate the concentration of H₃O⁺ in the solution

Let's consider the self-ionization of water.

2 H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)

The ion-product of water (Kw) is:

Kw = 1.0 × 10⁻¹⁴ = [H₃O⁺] × [OH⁻]

[H₃O⁺] = 1.0 × 10⁻¹⁴/[OH⁻]

[H₃O⁺] = 1.0 × 10⁻¹⁴/4.0 × 10⁻⁵

[H₃O⁺] = 2.5 × 10⁻¹⁰ M

Step 3: Calculate the pH of the solution

We will use the following expression.

pH = -log [H₃O⁺]

pH = -log 2.5 × 10⁻¹⁰

pH = 9.6

Taking into account the definition of pH and pOH, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.

First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pH + pOH= 14

In this case, you know that [OH⁻]= 4×10⁻⁵ M. For this concentration, the pOH is calculated as:

pOH= - log (4×10⁻⁵ M)

pOH= 4.398

Then, pH can be calculated as:

pH + 4.398= 14

pH= 14 - 4.398

pH= 9.602

So, the [H₃O⁺] is calculated as:

9.602= - log [H₃O⁺]

[H₃O⁺]= 10⁻⁹ ⁶⁰²

[H₃O⁺]= 2.5×10⁻¹⁰ M

Finally, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.

Learn more:    

Answer:

burny stuff

Explanation:

Answer:

Explanation:

Majority of fuels are comprised of hydrocarbons or compounds that contain carbon and hydrogen atoms. In a perfect setting, oxygen is supposed to convert all the hydrogen to water while the carbon is transformed to carbon dioxide.

Unfortunately, achieving a perfect combustion process is near impossible in reality. Fuels burn when they react with the amount of oxygen in the air. With insufficient air, the combustion doesn’t push through normally and ends up as an incomplete or partial combustion. Instead of just carbon dioxide, water, and nitrogen, an impartial combustion process produces harmful byproducts like partially burned hydrocarbons (VOCs) and Nitrogen oxides. A loss in fuel economy also occurs because not all of the fuel is properly processed to produce energy.

Answer:

An example of geotropism is the movement of nutrients. minerals and water in a plant. This transport is accomplished by specialized parts of the plant, the xylem which is pronounced zylem and the phloem which is pronounced flowem are the straw like parts of a plant’s stem that move the stuff up and down.

Explanation:

The new volume of the gas : 103.334 ml

Boyle's Law  

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

1 kPa = 0,00986923 atm

35.3 kPa = 0,3483839 atm

at STP ( 0°C, 1 atm) with volume 36 ml changed to 35.3 kPa :

P₁=1 atm

V₁=36 ml

P₂= 0,3483839 atm

The new volume(V₂) :

[tex]\tt V_2=\dfrac{P_1.V_1}{P_2}\\\\V_2=\dfrac{1\times 36}{0,3483839}=103.334~ml[/tex]

Answer:

B: They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.

Explanation:

I took the Unit test on EDG and I got it correct

Pls mark me brainliest

Answer:

Gneiss forms by regional metamorphism from both high temperature and pressure. Quartzite and marble are the most commonly used metamorphic rocks.

Answer:

0.2 moles of CO₂  are produced

Explanation:

Given data:

Moles of CO₂ produced = ?

Moles of Na₂CO₃ react = 0.2 mol

Solution:

Chemical equation:

Na₂CO₃ + 2HCl       →     2NaCl + CO₂ + H₂O

Now we will compare the moles of CO₂ with Na₂CO₃ .

                   Na₂CO₃          :             CO₂

                       1                  :               1

                    0.2                :             0.2

Thus, 0.2 moles of CO₂  are produced.

Answer:

The advantages of using an indicator to inform pH measurements:

It gives a mathematically result of the pH, in addition, it gives the precise pH of solvent, and it also gives an idea of the straight of the solution also.

Now, the advantage of using a pH meter:

It is a rapid method to characterize between acids, bases. However, this method does not show how strong acid or base actually are, plus it tends to gives a range of acidity or basicity not quite accurate as a result.

Answer:

The magnesium ion is much smaller than the magnesium atom because magnesium atom contains more electrons as compared to magnesium ion. Explanation: ... Whereas when an atom tends to lose an electron then it acquires a positive charge and size of the atom tends to increase.

Answer:

Because it looses it two electrons to form a stable octet Ionic form..........

H2SO4(aq)+NaOH(s)----->NA2SO4 + H20

When acid and base reaction takes place, it will form salt formation takes place. I.e., neutralization reaction. H₂SO₄+2NaOH→ Na₂SO₄+ 2H₂O.

A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.

H₂SO₄ is an acid and NaOH is a base. Acid react with base to form salt and water. Salt will be neutral charge and net ionic charge is zero.

Neutralization takes place when, complete dissociation takes place. If any partial dissociation, it will form acidic salt or neutral salt.

Thus complete dissociation neutral reaction is

H₂SO₄+2NaOH→ Na₂SO₄+ 2H₂O.

To find more about acid and base, refer the link below:

brainly.com/question/3941445

#SPJ2

Answer:

24,901 x 1609.34 = 40074275

40074275/100 equals

400742.75 s

divided by 3600

111.31

Explanation:

Answer:

I can, i love chemistry

Explanation:

Answer:

Normality is the number of gram equivalents of solute divided by the volume in liters.

The molarity is the amount of moles in solute divided by the volume in liters.

Moles are the molar mass times grams if you're curious

I hope this helps and good luck!

Answer:

Molarity and normality describe the numbers (moles) of reactants or products dissolved in one liter of solution. Molarity: M = moles of solute contained in one liter of solution. ... Normality is always a multiple of molarity. It describes the “equivalent” moles of reactants involved in chemical reactions.

Explanation:

Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Gram equivalent weight is the measure of the reactive capacity of a molecule. The solute's role in the reaction determines the solution's normality. Normality is also known as the equivalent concentration of a solution.

Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.

Formula for Molar: M = [tex]\frac{n}{v}[/tex]

Answer:

Valence electrons are the electrons located on the outer shell of the atom. To determine valence electrons of oxygen you can count how many electrons ae on the last shell of it's bohr diagram.

Explanation:

1.785714286 moles

The number of moles (n) for nitrogen is: [ n=50.0÷28.0 ] = 1.785714286 moles.

(JSYK: this is all considering that only whole batches are included and fractional batches aren't)

Answer: 3 batches (72 cookies), her limiting reactant should be sugar since she only has enough to make three batches exactly, and she will also have 3/4 a cup of flour left over, 2 cups butter, and 5 eggs, in addition to the excess of baking soda and baking powder.

Hope this helps, if not, comment below please!!!

Answer:

strontium

Explanation:

Answer:

Strontium

Explanation:

This is a earth metal, calcium is a reactive metal that forms a dark oxide nitride layer when exposed to air.

Answer:

28.04g of NaClO2 must be dissolved

Explanation:

When NaClO2 and HClO2 are mixed in a solution, a buffer is produced. The pH of this buffer is obtained using H-H equation:

pH = pKa + log [NaClO2] / [HClO2]

Where pKa is -log Ka = 1.9586

And [NaClO2] and [HClO2] could be taken as moles of each compound.

Moles of HClO2 are:

250mL = 0.250L * (1.60mol / L) = 0.40 moles HClO2.

Replacing:

pH = pKa + log [NaClO2] / [HClO2]

1.45 = 1.9586 + log [NaClO2] / [0.40mol]

0.31mol = [NaClO2]

To convert these moles to mass we need to use molar mass of NaClO2: 90.44g/mol:

0.31mol * (90.44g / mol) =

Explanation:

mole=mass/Molar mass

mass= mole×molar mass

m= 1.5 × (39+55+64)

m= 1.5 × 158

m= 237g

There are 237.06 grams in 1.50 moles of KMnO4.

HOW TO CALCULATE MASS:

= 158g/mol

Learn more at: https://brainly.com/question/15743584?referrer=searchResults

Answer:

what e said

Explanation:

Answer:

Here is the answer:

Explanation:

Answer:

7

Explanation:

Answer:

GRACIAS

Explanation:

Answer:

Thnx

Explanation:

Answer:

CH₃COO⁻ + NaNO₂ → CH₃COONa + NO₂⁻      

Explanation:

When equal volumes of 0.080 M aqueous acetic acid and sodium nitrite are mixed (1:1), we have:                            

Acetic acid = CH₃COOH    

Sodium nitrite = NaNO₂

The molecular equation is:              

CH₃COOH(aq) + NaNO₂(s) → CH₃COONa(s) + HNO₂(aq)      

The ionic equation is:

CH₃COO⁻H⁺ + Na⁺NO₂⁻  → CH₃COO⁻Na⁺ + H⁺NO₂⁻            

The net ionic equation is:          

CH₃COO⁻ + NaNO₂ → CH₃COONa + NO₂⁻      

I hope it helps you!                                  

Answer:

Explanation:

complete combustion reaction of  ethane is given by the reaction

2C2H6+7O2..............4CO2+6H2O

no of moles in 34 grams of O2=34/32=1.063

7mole of O2 produced 6 moles of H2O

therefore 1.063 moles of O2 produced=1.063*6/7=0.9 moles

now 0.9 moles of H2O contain how much grams=0.9*18=16.2 grams

Answer:

None. Electrons are not in the nucleus.

Explanation:

We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.

Symbol of proton= P⁺  

Symbol of neutron= n⁰  

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral .

The atom having atomic number 16 have 16 electrons and these electrons are present out side the nucleus.

Answer:

how and why things react, like why something turns into a gas or why something explodes.

Explanation: