I need help with number 3​
the equation is 4Al+3O2=2Al2O3

Answer:

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Answer:

pH = 6.5

Explanation:

Given data:

pH of substance = ?

[OH⁻] concentration = 3.2×10⁻⁸

Solution:

pOH = -log[OH⁻]

pOH = -log[3.2×10⁻⁸]

pOH = 7.5

we know that,

pH + pOH = 14

pH = 14- pOH

pH = 14 - 7.5

pH = 6.5

Answer:

[tex][I_2]=[H_2]=0.0157M[/tex]

[tex][HI]=0.124M[/tex]

Explanation:

Hello!

In this case, for the undergoing chemical reaction, we can write the equilibrium expression as shown below:

[tex]Kc=\frac{[HI]^2}{[I_2][H_2]}[/tex]

However, since the reactions starts with 0.155 M hydrogen iodide, we need to invert the reaction as well as the equilibrium expression:

[tex]2HI\rightarrow I_2+H_2[/tex]

[tex]\frac{1}{Kc}=0.0163 =\frac{[I_2][H_2]}{[HI]^2}[/tex]

And each concentration at equilibrium in terms of the reaction extent is:

[tex][I_2]=[H_2]=x[/tex]

[tex][HI]=0.155-2x[/tex]

Thus, plugging in the new expression we write:

[tex]0.0163 =\frac{x*x}{(0.155-2x)^2}[/tex]

Which has the following valid solution for [tex]x[/tex]:

[tex]x=0.0157M[/tex]

Because the other solution is negative. Therefore, the concentration of hydrogen, iodine and hydrogen iodide at equilibrium turns out:

[tex][I_2]=[H_2]=0.0157M[/tex]

[tex][HI]=0.155-2(0.0157)=0.124M[/tex]

Best regards!

At the equilibrium, the concentration of hydrogen and iodine has been 0.0157 M each, and the concentration of HI will be 0.124 M.

The initial concentration of the reactant has been 0.155 M. From the balanced chemical equation, the ICE table will be:

         HI          [tex]\rm H_2[/tex]          [tex]\rm I_2[/tex]

I      0.155        0           0

C       -2x         x           x

E  0.155 - 2x    x          x

The value of the equilibrium constant can be given by the ratio of the concentration of products to the reactant.

The equilibrium constant for the reaction will be:

[tex]\rm k_c\;=\;\dfrac{[H_2]\;[I_2]}{[HI]^2}[/tex]

The given constant value has been for the opposite reaction. Thus the constant for the required reaction has been :

[tex]\rm \dfrac{1}{given\;k_c} \;=\;\dfrac{[H_2]\;[I_2]}{[HI]^2}[/tex]

[tex]\rm \dfrac{1}{61.5}[/tex] = [tex]\rm \dfrac{(x)\;(x)}{(0.155-2x)^2}[/tex]

0.0162 = [tex]\rm \dfrac{x^2}{(0.155-2x)^2}[/tex]

By simplyfying the equation,

x = 0.0157 M

At the equilibrium, the concentration of hydrogen and iodine has been 0.0157 M each.

The concentration of HI will be:

HI = 0.155 - 2x

HI = 0.155 - 2(0.0157)

HI = 0.124 M.          

For more information about the equilibrium constant, refer to the link:

https://brainly.com/question/10038290            

Answer:

Chromosomes

Explanation:

A karyotype is an individual's collection of chromosomes

Hope this helps!

Plz click the Thanks button :)

Jayla

Answer:

I believe the correct answer is D.

Explanation:

You are breathing in dinitrogen and dioxygen. You exhale dinitrogen and carbon dioxide. And the atmosphere contains traces of other gases. You drink water. You have a wash with water, and soap. You eat carbohydrates and proteins. You ride to work on a vehicle powered by hydrocarbons, which spits out carbon dioxide exhaust fumes, and also some nitrogen oxides. And so your exposure to chemicals is pervasive, and unavoidable.

Answer:

d

Explanation:

Answer:

Radiation you're welcome <3

Answer:

yes that should be true

Answer:

true

Explanation:

One study found there is only about one gram of gold for every 100 million metric tons of ocean water in the Atlantic and north Pacific

Answer:

1:2:1  or just 1:2

The molecular formula is C6H12O6 because one molecule actually contains 6 C, 12 H, and 6 O atoms. The simplest whole-number ratio of C to H to O atoms in glucose is 1:2:1,

Explanation:

Answer:

electrons, protons i think

Explanation:

Answer:

100.0869 g/mol

The molar mass of CaCO3 is 100.0869 g/mol. We need to add the molar masses of calcium (40.078 g/mol), carbon (12.0107 g/mol) and three oxygen atoms

Explanation:

Answer:

Chromium, calcium, and osmium

Explanation:

These elements are metals, considering this, these elements electron shells(orbitals) are further away from the nucleus, with this, their attractions are not as strong as non-metals, so some of their electrons are able to move freely.

When you accumulate many atoms, these metals can form a "sea of electrons"  because they all have loose electrons interacting with each other. This allows easy conduction of heat and electricity.

Answer:

Chromium

Calcium

Osmium

Explanation:

The elements likely conduct electricity well are chromium, calcium and osmium. As these are metals and are observed to be good conductors of heat and electricity. They have extra electrons to donate and hence flow of electrons cause them to be a good conductor of electricity. Rest iodine is a non-metals which is not good conductors of electricity. Carbon is not itself a good conductor but one of its allotrope which is graphite is a good conductor of electricity.

Answer:

SI unit

Explanation:

the base unit of volume in the SI system is the cubic meter

Answer:

wasdwsdwasdasdhjkgchkhjck

Explanation:

gkghkghklhjljkxfjy iuipfghjgykjhgklj

Answer:

change from solid to gas

Hii!! I believe the correct answer is D. can change from solid to gas. ((:

Answer:

NaCl

Explanation:

The only chemical species that shows an ionic compound is NaCl.

NaCl is an ionic compound that conducts electricity in molten state due to presence of free mobile electrons in the structure when molten.

Answer:

 it is A i took the test could i have the crown please

Explanation:

Answer:

Bent = Linear but bent due to the Lone Pairs that it contains, the more Lone Pairs the greater the bent and the smaller the degree. It is 3 atoms total.

The discussion on bent/linear shape, and its further calculation can be defined as follows:

Learn more:

brainly.com/question/2871827

Answer:

Average atomic mass  = 6.93 amu.

Explanation:

Given data:

Percent abundance of lithium -6 = 7%

Percent abundance of lithium - 7 = 93%

Average atomic mass of Li = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (7×6)+(93×7) /100

Average atomic mass =  42+ 651 / 100

Average atomic mass  = 693/ 100

Average atomic mass  = 6.93 amu.

Answer:

Neon consisted of atoms of two different masses but chemically alike. ... Movement of electrons between energy levels in atom must absurb just a certain amount energy to move to higher level can't hover between levels.

Answer:

Friction

Explanation:

Answer: I'm guessing but I think this is the answer and also what I put in mine sorry if wrong

Explanation: I think it's "B.- Slightly Acidic" srry if it's too late-

Answer:

It  remains the same

Explanation:

Answer:

D. The chemical formula

Explanation:

For example, in the compound KCl, we know that there are two elements present because you can see it in the chemical formula. We know that KCl consists of potassium and chloride ions.  

Answer:

o A copper-tin alloy

Explanation:

Answer:

as u should. candy ain't even that tempting >^<

Answer:

How about free hoodies and chocolate.....Jkjkjk.....that happened to me once then I got rap edh

Explanation:

Answer:

Yea pretty much

Explanation:

Answer:

The correct answer is - Orange light reflected from the t-shirt enters human eyes.

Explanation:

Human eyes and brain are altogether able to detect the color of the object by translating the light which is reflected by the object and transmitted by the light receptors in the eyes ad brain translate light to color.

The objects are able to absorb some colors and reflect others on the basis of their wavelength, The reflected colors are detected by our eyes and brain and objects appear to be a particular color. like here, the orange color is reflected by the t-shirt and enters in human eyes.

Answer:

its c

Explanation:

Answer:

D. The water enters an aquifer through infiltration.

Explanation:

Hope it helps you:)

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Answer:

2Al(s) + 6HCl(aq)→2AlCl3(aq) + 3H2(g)