115 mL of a 2.35 M potassium
fluoride (KF) solution is diluted with 1.28 L of water. What is the new concentration in molarity?
? M KF

Answers

Answer 1

The new concentration : = 0.194 M

Further explanation

Given

115 mL(0.115 L) of a 2.35 M Potassium  fluoride (KF)

1.28 L of water

Required

The new concentration

Solution

Dilution is the process of adding solvent to get a more dilute solution.

The moles(n) before and after dilution are the same.

Can be formulated :

M₁V₁=M₂V₂  

M₁ = Molarity of the solution before dilution  

V₁ = volume of the solution before dilution  

M₂ = Molarity of the solution after dilution  

V₂ = volume of the solution after dilution

V₂=0.115 + 1.28 = 1.395 L

Input the value :

M₂ = (M₁V₁)/V₂

M₂ = (2.35 x 0.115)/1.395

M₂ = 0.194

Answer 2

Answer: 0.194

Explanation:


Related Questions

Energy of motion is called ________energy *

Answers

Kinetic energy
.............

Answer:

Kinetic - Kinetic energy is the energy of motion

Explanation:

Thermal energy - heat energy

Potential energy - energy that is stored

Hope this helped!

Have a supercalifragilisticexpialidocious day!

1. A dry, empty bottle is placed in an ice bath. After the air inside the bottle is cooled off, a balloon is placed
over the opening. The bottle with the balloon is then placed in very hot water and the balloon inflated. Why
did the balloon inflate?

Answers

Answer:

hot air rises and expanded the balloon

Explanation:

thats it.

The hot air rises and expanded the ballon. This is as the air in the bottle cools down, the molecules of the air slow down and take up less space because they move closer together. The air then moves out of the balloon and back into the bottle, causing the balloon to deflate.

Atmosphere
B
Ocean
Land
с
Which arrow or arrows represents a change of state from a liquid to a gas caused by the
sun's energy?
A. arrow A
B. arrow B
C. arrow A and arrow B
D. arrow B and arrow C

Answers

I can’t see the arrows but it would be evaporation so water to air

Complete the following sentence: In a reaction containing two reactants, if one of the reactants is in excess, the other reactant is known as the ______ reactant.

Answers

Answer:

excess reactant

Explanation:

The excess reactant is the reactant in a chemical reaction with a greater amount than necessary to react completely with the limiting reactant. It is the reactant(s) that remain after a chemical reaction has reached equilibrium.

In a reaction containing two reactants, if one of the reactants is in excess, the other reactant is known as the limiting reactant which decides the yield of the reaction.

What is limiting reactant ?

In a reaction, all the reactants have to be in correct stoichiometry to complete the reaction. To achieve the mole ratio of the reactants is very much important for the completion of a reaction.

If a reactant is insufficient in amount, then the reaction will stop as soon as this reactant is consumed. Hence, this reactant determine the yield of the product. This reactant which is not in correct stoichiometry for the complete reaction is called the limiting reactant.

The reactant which is excess in quantity thus does not have a role in the yield of the reaction is called the excess reactant. Whatever, the concentration of this reactant in extra, the reaction does not proceed after the consumption of limiting reactant.

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Please help with this

Answers

i’m not 100% sure but ( 1 , 4 , 3 , 2 )

The Aufbau Principle describes that
O electrons with the same spin cannot occupy the same orbital.
electrons will occupy single orbitals within and energy level before doubling up
electrons fill lower energy levels first before occupying higher energy levels.
O electrons in the same level have the same amount of energy

Answers

Answer:

electrons fill lower energy levels first before occupying higher energy levels.

Explanation:

The Aufbau's principle describes that electrons fill lower energy levels first before occupying higher energy levels.

In writing the electronic configuration of atoms, the Aufbau's principle is one of the most important principles to consider.

It states that "sublevels with with lower energies are filled up before those with higher energies".

Sublevels do not fill up in numerical order.

Ionic bonds form between _____ which form positively charged ions and _____ which form negatively charged ions.

Answers

ionic bonds form between metals which form positively charged ions and nonmetals which form negatively charged ions.

Which three elements have the most similar chemical properties?
1.
Ar, Kr, Br
2
K, Rb, Cs
3.
B, C, N.
4.
O, N, Si

Answers

Answer:

2.

Explanation:

Beacuse they are all group 1 metals. All have the same boiling, melting point and reactivity due to one electron in its outer shell.

Potassium(k), rubidium(Rb), and cesium(Cs) are the three elements from the given list that have the most similar chemical properties.

Therefore the correct answer is option 2.

What is the atomic number?

The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.

While the atomic mass of an atom is the sum of the total number of protons and the number of neutrons present inside of any atom.

From the list of elements, potassium (k), rubidium (Rb), and cesium (Cs) are the three that share the most chemical similarities.

Thus, option 2 is the right response.

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What does microbiome do to your cells?

Answers

Here’s what I found Hope I helped ;)

Some students believe that teachers are full of hot air. If I inhale 2.1 liters of gas at a temperature of 200 C and it heats to a temperature of 370 C in my lungs, what is the new volume of the gas?

Answers

Answer:

2.86L

Explanation:

Given parameters:

V1  = 2.1L

T1  = 200°C  = 200 + 273  = 473K

T 2  = 370°C  = 370 + 273  = 643K

Unknown:

V2  = ?

Solution:

Since pressure is constant, we apply the Charles's law;

           [tex]\frac{V1}{T1}[/tex]   =  [tex]\frac{V2}{T2}[/tex]  

V is volume

T is the temperature

1 is the initial state

2 is the new state

                [tex]\frac{2.1}{473}[/tex]    = [tex]\frac{V2}{643}[/tex]  

                 V2  = 2.86L

Which technique helps you become more resoureful

Answers

Answer:

There is an abundance of technology to help students become more resourceful and productive. For example, mind mapping can help kids better understand problems and devise plans by visualizing connections, outlining different sides of issues, and determining next steps.

Explanation:

Reading books or studying .
Set concrete goals. To become successful faster, you first need a road map for your career. ...
Establish a routine, and stick to it. ...
Find a mentor. ...
Streamline your routine. ...
Learn how to say no. ...
Be smart about money. ...
Learn from your mistakes.

A student increases the temperature of a 673 cm^3 balloon from 275 K to 460 K.

Assuming constant pressure, what should the new volume of the balloon be?

Round your answer to one decimal place.

Answers

Answer:

1125.75 cm³

Explanation:

We are given;

Initial volume; V1 = 673 cm³

Initial temperature; T1 = 275 K

Final temperature; T2 = 460 K

From Charles law, we can find the new volume from;

V1/T1 = V2/T2

V2 = (V1 × T2)/T1

V2 = (673 × 460)/275

V2 = 1125.75 cm³

Which three elements are combined in lithium sulfate ?

Answers

Answer:

jsidndnxjxixdjdbsjsjdidnsjdjdidndjd

6. A father rabbit had long ears while the mother rabbit had short ears. Which of these statements
explains why one of the baby bunnies could have long ears?
a
The baby bunny inherited its copies of the gene for ear length from its father and not from
its mother. Those genes connect together to make its ears long.
b
The baby bunny inherited its copies of the gene for ear length from its father and not from
its mother. Just like its father's genes, those genes instruct for proteins that connect in
ways that make its ears long.
С
The baby bunny inherited one copy of the gene for ear length from its father and one copy
from its mother. That gene combination instructs for proteins that connect in ways that
make long ears.
d
The baby bunny inherited one copy of the gene for ear length from its father and one copy
from its mother. Those genes connect together to make its long ears.

Answers

Answer:

D if I’m correct

Explanation:

Which job title describes a person with a career in green energy?

Answers

Answer:

Natural resource professional

Explanation:

The job title that describes a person with a career in green energy is a hydroelectric technician. The correct option is c.

What is green energy?

Green energy is renewable energy and these energies are produced by renewable resources. Renewable resources are the resources that will not be reduced, and these natural resources are present, and these energies can reproduce again by these resources.

The hydroelectric technician is the person who checks the technical problems of a hydroelectric power plant. Hydroelectricity is produced by water.

This is a renewable resource, and it does not produce any kind of pollution, So a hydroelectric technician will be a job title that describes a person with a career in green energy.

Therefore, the correct option is c., hydroelectric technician.

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The question is incomplete. Your most probably complete question is given below:

Elevator installer

sewing machine operator

hydroelectric technician

animal trainer

16.
As the elements in Group 17 on the Periodic Table
are considered from top to bottom, what happens
to the atomic radius and the metallic character of
each successive element?
A. The atomic radius and the metallic character
Aboth increase.
B. The atomic radius increases and the metallic
character decreases.
C. The atomic radius decreases and the metallic
character increases.
D. The atomic radius and the metallic character
both decrease.

Answers

Answer:

Explanation:

When going from top to bottom in any group of the periodic table, the atomic radius always tends to increase

What does the pH of a solution represent?


A. The pH represents the partial pressure of hydrogen gas.


B. The pH tells how quickly a reaction reaches equilibrium.


C. The pH indicates how acidic or basic a solution is.


D. The pH is an indicator of the salt content of a solution.

Answers

Answer:

The pH indicates how acidic or basic a solution is.

Explanation:

i just took the test and got it right.

pH of a solution is the measure of how acidic or basic the solution is. It is determined based on the H+ ion concentration in the solution. Hence, option C is correct.

What is pH?

pH of a solution is the measure of the H+ ion concentration in a solution. It determines the acidity or basicity of the solution. Mathematically it is the negative logarithm of H+ ions concentration.

pH = - log [H+]

A pH scale can be used to determine the acidity or basicity of a solution. If the basicity is 7, then the solution is neutral. If the pH is less than 7 then the solution is acidic and a pH above 7 is basic solution.

Red- green color in pH scale represent the acidic solution where green is neutral and cyan to dark blue color is given by bases. Using a litmus paper the acidity can be checked based on these color change.

To find more on pH, refer here:

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Determine the number of valence electrons for each of the following:
O
Cs
Ca
Se2-
Na+
C
N
Al
He

Answers

O has 6
Cs has 8
Ca has 2
Se2 has 18
Na+ has 1
C has 4
N has 5
AI has 3
He has 2
There those are the answers!!!

Please help me!!! 12 points :)

Answers

I hope you get the answer your looking for :)

what is the correct answer !

Answers

The answer for this question is A!

Answer:

Hi there, The correct answer is, OPT A

Explanation:

Please mark as the brainliest

How to calculate the number of molecules in 18g of H2O

Answers

We, know molecular mass of water is, M = 16 g/mol .

Given mass of water, m = 18 g.

We know, number of moles is given by :

[tex]n = \dfrac{18\ g}{16 \ g/mol}\\\\n = 1.125\ moles[/tex]

Now, 1 mole of any compound contains 6.022 × 10²³ molecules.

So, number of moles in 1.125 moles of water is 1.125 × 6.022 × 10²³ =

6.77 × 10²³ molecules.

Hence, this is the required solution.

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Q26. Aqueous sodium oxalate (C204)2- and aqueous lead (II) nitrate react to product solid
lead (II) oxalate and aqueous sodium nitrate.
3.
I need Balanced chemical equations

Answers

Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + 2NaNO₃(aq)

Further explanation

Given

Word equation

Required

Balanced equation

Solution

Convert to skeleton equation

Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + NaNO₃(aq)

Balanced equation

Give a coefficient

Na₂C₂O₄(aq) + aPb(NO₃)₂⇒bPbC₂O₄(s) + cNaNO₃(aq)

Make an equation

C, left = 2, right =2b⇒2b=2⇒b=1

Na, left = 2, right = c⇒c=2

O, left = 4+6a, right = 4b+3c⇒4+6a=4b+3c⇒4+6a=4.1+3.2⇒6a=6⇒a=1

The equation becomes :

Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + 2NaNO₃(aq)

how does the concentration of sodium thiosulphate affect the rate of reaction in between hydrochloric acid and sodium thiosulphate​

Answers

Answer: C

Explanation:

I know because i did it.

LOOK AT THE PICTURE!! i’ll mark as brainliest!!

Answers

Answer:

c

Explanation:

First I’d go with Cl-Cl. Second I would go with sodium iodide

_____ are bits and pieces of material that end up in a body of water.

Answers

Answer:

sediments

Explanation:

why does condensation not occur on the outside of a warm glass of water?

Answers

Answer:

its called vapor. It can hold so much than colder eater based on the weather. For example if its cold it can heat up faster but if its hot it will maybe stay the same

why are cells small?​

Answers

Answer:

you know what i really dont know but imagine if they were huge

Explanation:

Because if a cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume.
They are also small so they can maximize the ratio of surface area to volume. Smaller cells have a higher ratio which allows more molecules and ions move across the cell membrane per unit of cytoplasmic volume.

basically cells are small because they need to be able to get the nutrients in and waste out quickly.

Charles's law describes the relationship of the volume and temperature of
gas at a constant mass and pressure. According to this law, what would
happen to the volume of the gas if its temperature increased from 150 K to
300 K?

A. The volume would increase from 150 mL to 300 mL.
B. The volume would be reduced by half.
C. The volume would decrease by 150 mL.
D. The volume would double.

Answers

Answer:

Charles's law is: When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion. So the volume would increase

A 5.0 g sample of metal was heated to a temperature of 100.0 °C then placed into a calorimeter containing 35 mL of water at 20.0°C.
The final temperature was 26.5°C What is the specific heat capacity of the metal?

Answers

The specific heat capacity of the metal : c = 2.59  J/g °C

Further explanation

Given

5 g sample

35 ml water = 35 g

Required

The specific heat capacity of the metal

Solution

Heat can be formulated :

Q = m.c.Δt

Q in = Q out

Q absorbed = Q released

Q water = Q metal

35 g x 4.184 J/g °C x (26.5-20)= 5 x c x (100-26.5)

951.86 J = 367.5 x c

c = 2.59  J/g °C

5. Solve the following crossword puzzle.


a. Maximum energy generation in India is done using ........ energy.

b. energy is a renewablesource of
energy.

c.Solar energy can be called.... energy.

e. ......... energy of water in dams is used for generation of electricity.

Answers

Answer:

I think it is b

Explanation:

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