Chemistry High School

What is the Ka of a 0.0981 M
solution of hydrocyanic acid
(HCN) with a pH of 6.00?
Ka = [?] x 10!?)

Answers

Answer 1

Answer:

Attached picture

Ka = [?] x 10

1.02 x 10^-11 = [?] x 10

[?] = 1.02 (I'm assuming you're asking this)

(If not then divide the 10)

What Is The Ka Of A 0.0981 Msolution Of Hydrocyanic Acid(HCN) With A PH Of 6.00?Ka = [?] X 10!?)
Answer 2

Answer:

The answer is 1.02x10^-11

Explanation:

Fill in the box 1.02 and then -11

Related Questions

One advantage to using nuclear power is —

it produces no air pollution

it is hard to store and dispose of the waste

the expense of constructing nuclear reactors

the threat of an accident

Answers

it produces no air pollution

Answer:

it produces no air pollution

2LiBr Pb(NO3)
2 → PbBr2 2LiNO3

Answers

Is this a complete question?

26) Is the constant speed that a falling object eventually reaches when air 3 points
resistance builds up and prevents further acceleration *
Speed of Gravity
Terminal Velocity
Acceleration
Drag speed

Answers

Answer:

terminal velcity

Explanation:

Question 1 (1 point) How many stars are in our solar system? A. About 20.000 B. About 300,000 C. One D. About 5,000 ​

Answers

Answer:

C. one star

Explanation:

Of course our solar system has one unique star which is the sun while others have atleast two which are called binary solar

What happened when you mixed the two substances together? The substances changed into different substances. The substances changed into different substances. The substances did not change into different substances. The substances did not change into different substances. I am not sure if the substances changed into different substances. I am not sure if the substances changed into different substances.

Answers

Answer:

is this a poem or something?

In addition to showing the ratio of atoms in a molecule, what else do the subscripts in a formula tell us?​

Answers

Answer:

See explanation

Explanation:

Usually, when we write a chemical formula for any compound or other chemical specie, we use subscripts to;

Indicate the ratio of atoms of each element present in the compound or chemical specieShow the number of atoms of each element present in the compound or chemical specie.

Hence, the subscripts written after chemical formulas have more than one function as described above.

In H2SO4 for instance, there are two hydrogen atoms, one sulphur atom and four oxygen atoms as shown in the chemical formula.

A bicycle tire holds 1.50 L of air at 5atm and 20.0 °C. How many moles of air is this?
If the average mass of air is 29.0 g/mol, what is the mass of air in the tire?​

Answers

Answer:

9.05 g

Explanation:

PV=nRT

Use the ideal gas equation. Substitute values.

P = 5 atm

V = 1.50 L

n = ?

R (gas constant) = 0.08206 L-atm/mol-K

T = 20.0°C

*Always convert °C to K.

T = 20.0° + 273 = 293K

Substitute values.

(5 atm)(1.50 L) = n(0.08206 L-atm/mol-K)(293K)

n = (5 atm)(1.50 L) / (0.08206 L-atm/mol-K)(293K)

n = 0.3119335... mol

Convert to grams with the given average mass of air.

0.3119335... mol x (29.0 g/1 mol) = 9.05 g

Burning a candle melts the wax, but also burns the wick. Explain how burning a candle involves both physical and chemical changes.

Answers

Answer:

Burning of the candle is both physical and chemical change. Burning of the candle melts the wax and hence physical state of wax has changed from solid to liquid.  

Again the wax combines with the atmospheric oxygen and changes to carbon dioxide, heat and light.  

Thus both the changes are accompanied by the burning of the candle.

Explanation:

hope this helps!

~mina

someone help me on these two 2

Answers

Answer:

Question 4 is- Solubility

Question 5 is- Suspension

Hopes this helps >:D

Mass number symbol =

Answers

Answer:

A is the symbol of mass number.

Explanation:

→ Mass number (A) = Protons + Neutrons

It is the required formula. The symbol of the mass number is A.

Answer:

The letter A

Explanation:

In a 0.879 M potassium permanganate (KMnO4) aqueous solution, what is the SOLUTE?

Answers

Answer:

Potassium Permanganate

Explanation:

A solution is defined as the mixture of two or more substances. The substance that is in big proportion is called as Solvent, the substance that is in low amount is called as Solute.

In an aqueous solution, the solvent is the water. As the aqueous solution is 0.879M KMnO4, the solute is:

Potassium Permanganate

the formula equation of Acetylene + oxygen ----> carbon dioxide + water ​

Answers

Answer:

The final balanced equation is : 2C2H2+5O2→4CO2+2H2O.


Which of the following pictures is a chemical change, and which is a
physical change? Explain in the boxes next to the picture.

Plz explain

Answers

Answer:

left is chemical because its chemicals, and right is physical because the ice cream is melting and thats physical

Explanation:

HELP ME ASAPPP plsss

Answers

Don’t download that I’ll help D

PLEASEEEEEEEEEEEEE HELP You get 28 points

1. _____are muscles that you control, for example, your bicep.

2. ________muscles are muscles that you DO NOT consciously control, for example, your heart.

3. Tendons are _______ that connect muscles to joints.

Answers

What is the answer choices
1. Skeletal Muscles
2. Smooth
3. Tissues

How do plants respond to seasonal changes

Answers

Answer

Plants can respond to the change of season by losing their leaves, flowering, or breaking dormancy. Plants go through seasonal changes after detecting differences in day length.

Explanation:

(06.05 LC)
Why is it important to maintain records of the procedures of an experiment?
points)
Multiple Choice

Answers

to make it possible for others to replicate the experiment:)

How many molecules are in
6.0 moles of methane (CH4)?

Let's begin by setting up our equation.

What belongs in the green box?

6.0 moles CHA

A. 1 mole CH4
B. 6.02 x 1023 molecules CH4

Answers

It’s B
Because 6.02

When a small piece of sodium metal is dropped into a beaker of water, hydrogen gas (H2) and a solution of sodium hydroxide (NaOH) are products. The solution becomes warm.

Answers

Answer:

The reaction is exothermic as the solution becomes warm.

Explanation:

Hello there!

In this case according to the described reaction between sodium metal and water, we can write up the chemical equation whereas the products turn out to be sodium hydroxide and hydrogen gas:

[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]

Moreover, these reactions are known to be highly exothermic, for that reason the solution becomes warm as the reaction releases heat as it goes to completion.

Best regards!

Which of these would be found in a wetland?
Mrs. Cornell and vultures
Cattails and salamanders
Maple trees and cats
Oak trees and squirrels

Answers

Answer:

jwjsjdjdhdvjeiejjrjrje

What is the activation energy of this reaction?

50 kJ
100 kJ
150 kJ
200 kJ

Answers

Answer:

50 kJ

Explanation:

Activation energy is between the energy of reactants and the peak of the curve.

200 kJ - 150 kJ = 50 kJ

The correct answer is 50kJ

What is Activation Energy?The least amount of energy required to activate atoms or molecules to a state in which they can undergo a chemical reaction is known as Activation Energy.

What is the activation energy of this reaction? The activation energy of this reaction is the energy released between reactants and productsIn graph the activation energy is difference between Reactants and the peakTherefore, 200-150=50KJ

Hence 50KJ is activation energy

Learn more about Activation energy on

https://brainly.com/question/26724488

#SPJ2

what is the mass of 2.31 x 10^23 formula units of SrF2?

Answers

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 40.51 g is the mass of 2.31x10²³ formula units of SrF[tex]_2[/tex].

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample.

Given number of atoms= 2.31x10²³atoms

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

Substituting the values

mole= 2.31x10²³÷ 6.022×10²³

mole = 0.38 moles of SrF[tex]_2[/tex]

mass of SrF[tex]_2[/tex]= moles of SrF[tex]_2[/tex] × Molar mass of SrF[tex]_2[/tex]

mass of SrF[tex]_2[/tex]= 0.38  × 106.6184

mass of SrF[tex]_2[/tex] = 40.51 g

Therefore, 40.51 g is the mass of 2.31x10²³ formula units of SrF[tex]_2[/tex].

To know more about mole, here:

https://brainly.com/question/15209553

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1. A student wants to find how many calories are in a peanut. Describe in detailed complete sentences how they can test this using a can with
150g of water and a thermometer.

Answers

Answer: 65 cal

Explanation: they have to find the weight of the peanuts on a scale and per grams. Then put them in water . You should be able to get the calories

Madison is heating two different liquids. For each liquid, she wants to compare the temperatures at which gas bubbles form, rise, and begin to escape. What physical property is Madison using to compare the liquids?Immersive Reader boiling point conductivity melting point solubility

Answers

Answer:

I think its boiling point conductivity

Answer: boiling point

Explanation:

Got it right

Numbers 15-21

HELP PLEASE!!

Answers

I wish I could help you, but I cannot see your paper. Please re-upload so I can help you : )
Re upload the pic I can’t see it ://

Which of the following is another term for eruptions of gas on the sun's surface?
A. nuclear fusion
B. sunspots
C. coronas
D. solar flares

Answers

Answer:

D

Explanation:

Enthalpy of

CH4(g) + 2NO2(g) -> N2(g) + CO2(g) + 2H2O(l)

Answers

Answer:

-177.9 kJ.

Explanation:

Use Hess's law. Ca(s) + CO2(g) + 1/2O2(g) → CaCO3(s) ΔH = -812.8 kJ 2Ca(s) + O2(g) → 2CaO(s) ΔH = -1269.8 kJ We need to get rid of the Ca and O2 in the equations, so we need to change the equations so that they're on both sides so they "cancel" out, similar to a system of equations. I changed the second equation. Ca(s) + CO2(g) + 1/2O2(g) → CaCO3(s) ΔH = -812.8 kJ 2CaO(s) → 2Ca(s) + O2(g) ΔH = +1269.8 kJ The sign changes in the second equation above since the reaction changed direction. Next, we need to multiply the first equation by two in order to get the coefficients of the Ca and O2 to match those in the second equation. We also multiply the enthalpy of the first equation by 2. 2Ca(s) + 2CO2(g) + O2(g) → 2CaCO3(s) ΔH = -1625.6 kJ 2CaO(s) → 2Ca(s) + O2(g) ΔH = +1269.8 kJ Now we add the two equations. The O2 and 2Ca "cancel" since they're on opposite sides of the arrow. Think of it more mathematically. We add the two enthalpies and get 2CaO(s) + 2CO2(g) → 2CaCO3(s) and ΔH = -355.8 kJ. Finally divide by two to get the given equation: CaO(s) + CO2(g) → CaCO3(s) and ΔH = -177.9 kJ.

What statement best explains how life functions a unicellular organism are carried out?​

Answers

Answer:

The structures in the cell work together to perform its life functions

Explanation:

Answer:

What statement best explains how life functions a unicellular organism are carried out?​

Explanation:

The energy needed to overcome intermolecular forces is called?

Answers

Answer:

vaporization.

Explanation:

what is the chemical equation for

3fe(s)+4h2o(l)→fe3o4(s)+4h2(g)

Answers

i don’t pay attention to science

Answer:

3fe s )+ 4h2o G )= fe3o4 s )+ 4h2 G

Explanation: 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (i) Iron metal is getting oxidised. (ii) Water is getting reduced. (iii) Water is acting as reducing agent.

Explanation:

i make a search

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