The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What are indicators?Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.
In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.
Hence option (4) is correct.
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Carson’s class visited a hydroelectric plant on a field trip during their study of energy. The process interested him, and he had the chance to observe it in action. Explain how moving water generates electrical power, and describe where it goes.
Answer:
look in your science book
Explanation:
Hydroelectricity or hydroelectric power is the electricity generated from hydropower. It is the Hydropower which supplies one sixth of the worlds electricity. Here water in motion is used to generate the electricity.
How water generates electricity?Hydroelectricity is produced by utilizing the gravitational force of moving water. Hydropower plant requires a dam. The dam is a massive wall that blocks the flow of the river, therefore a lot of water collects behind the dam. Near bottom of the dam, there is an intake from which water is left into the dam.
The device which is used to obtain energy from the moving water is called the turbine. The turbine is connected by a shaft to the generator. When the water rotates the turbine, electrical energy is generated.
Hydropower plants also have a pumped storage where the water is kept as a reserve for periods of peak power demand.
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A box is pushed across the floor for a distance of 5 metters with a force of 50N in 5 seconds. a. how much work is done? b. what is the power. also what formulas are used.
Answer:
50W
Explanation:
The formula and is
W = F × s
(force x distance)
W= 50 N× 5 m =250 N m=250 J
Done in 5 seconds the power is
p
=
W
t
where
t
=time
p
=
250
J
5
=
50 J
/s
=50 W
Answer:
Maybe 250 newtons
Explanation:
What is required for a steady state reaction that is not required for an equilibrium reaction?.
Answer:
any thing going on within the organism its self- and is not unatural
Explanation:
Look at the diagram. What is substance X?
Enter your answer
What is substance x??
Molten cryolite is the substance which serves as an electrolyte in the diagram.
What is an Electrolyte?This is defined as a substance that conducts electricity when dissolved in water.
Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.
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Answer: Molten cryolite
Explanation: Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.
Devise a three‑step synthesis of the product from 1‑methylcyclohexene
The three step synthesis of the product from 1-methyl cyclohexane includes the addition of;
C6H5CO3H in CH2Cl2C6H5Li in etherPCC in CH2Cl2.Three step synthesis from 1 methyl cyclohexeneThe three steps reaction involves the use of Reagannts such as;
Reagent 1: C6H5CO3H in CH2Cl2.Reagent 2: C6H5Li in ether.Reagent 3: PCC in CH2Cl2.Each step in the synthesis is arranged in the order:
Step 1: Epoxide formationStep 2: Nucleophilic additionStep 3: Oxidation of OH group.Read more on three step synthesis;
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Three step synthesis of the product from 1‑methylcyclohexene includes epoxide formation, nucleophilic attack and oxidation of -OH group.
What is synthesis reaction?Synthesis reactions are those reactions in which formation of new product takes place by the rearrangement or combination of reactant molecules.
Given question is incomplete so the complete pic of the question is attached below. In the given reaction reagents 1, 2 and 3 are used is C₆H₅CO₃H in CH₂Cl₂, C₆H₅Li in ether and PCC in CH₂Cl₂ respectively.
In the tree step synthesis process, in the first step formation of epoxide takes place, in the second step attack of nucleophile on epoxide takes place and finally in the third step oxidation of hydroxyl group to ketone group takes plce.
Hence 3 step synthesis includes epoxide formation, nucleophilic attack and oxidation of -OH group.
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Consider the two‑step synthesis of 2‑hydroxy‑2,4‑dimethylpentanoic acid using the reagents provided
The two step synthesis 2‑hydroxy‑2,4‑dimethyl pentanoic acid of involves compounds as represented in the attached image.
Two step synthesis of organic compoundsFrom the task content:
It therefore follows that the Starting compound A and intermediate compound B are as represented in the attached image.
Compound A is 4-methyl pentan-2-oneRemarks: The reagents provided are, H3O, Potassium cyanide and Hydrogen cyanide.
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A chemical supply company sells sulfuric acid (h2so4) in a concentration of 4. 00 m. What volume of this solution would you need to make 12. 0 ml of a 0. 50 m h2so4 solution?
Answer:
H3CS06
Explanation:
A chemical supply company sells sulfuric acid (H3CS06) in a concentration of 4.00 M. What volume of this solution would you need to make 12.0 mL of a 0.50 M H2SO4 s…
Molarity is the ratio of a mole of the solute of the substance to the liter of solution. The volume of solution required to make 12.0 ml of 0.50 M solution is 1.5 mL.
What is molar dilution?Molar dilution is the calculation of the molarity or the volume of the unknown value from the known value. It is given as,
[tex]\rm M_{1}V_{1}= \rm M_{2}V_{2}[/tex]
Given,
Initial molarity = 4.00 M
Initial volume =?
Final molarity = 0.50 M
Final volume = 12.0 mL
Substituting values in the equation:
[tex]\begin{aligned} \rm V_{1} &= \rm \dfrac{\rm M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.50 \times 12.0 }{4.00}\\\\&= 1.5 \;\rm ml\end{aligned}[/tex]
Therefore, 1.5 ml of 4.00 M sulfuric acid must be used to make 12 ml of 0.50 M solution.
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Hurrrryyyyy pls
Based on the experiment below, what was the dependent variable?
Bean
Soil
Bean
Soil
Bean
Soil
Height 20.4 cm
Mass: 159
Height: 45.7 cm
Mass: 6.19
Height: 46.5 cm
Mass: 6.69
LI
Daily water 10 mL
A Daily water 50 mL
B
Daily water 100 mL
С
Answer:
The growth of the plant
Explanation:
The growth of the plant from the bean soil is the dependent variable I believe. This is because it could change depending on many factors for e.g. the amount of light or water
The use of evaporation and condensation to separate the partsof a mixture is called _____
Answer: Evaporation Condensation is used to seperate the parts of a mixture
Explanation: This is because it is the first order of the distilation process
The use of evaporation and condensation to separate the parts of a mixture is called distillation.
What is distillation?
Separating salt water to produce pure water and salt is an example of a simple distillation mixture.
The water begins to evaporate during the distillation process, and the vapor cools down to form pure water.
A second container is used to collect the pure water.
Thus, the use of evaporation and condensation to separate the parts of a mixture is called distillation.
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60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf v = 62.7 \ L}[/tex]
Explanation:
Given Data:
Mole = n = 3.38 mol
Temp = t = 269 K
Pressure = 1.19 atm
Gas constant = R = 0.08206 L atm K⁻¹ mol⁻¹
Required:
Volume = v = ?
Formula:
Pv = nRT
Solution:
Rearranging formula
[tex]\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(3.38)(0.08206)(269)}{1.19} \\\\v = \frac{74.6}{1.19} \\\\v = 62.7 \ L\\\\\rule[225]{225}{2}[/tex]
Cyanide and water react in a proton transfer reaction to form hydrogen cyanide and hydroxide
The proton transfer reaction between Cyanide and water can be written as; X^- + H2O -----> HX + OH^-
What is a proton transfer reaction?A proton transfer reaction is one in which a proton is moved from one chemical specie to another.It is in fact and acid - base reaction in the Brownstead - Lowry sense.
The proton transfer reaction between Cyanide and water can be written as(Let the cyanide ion be shown as X);
X^- + H2O -----> HX + OH^-
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The proton transfer reaction to form hydrogen cyanide and hydroxide is
X⁻ + H₂O → HX + OH⁻
What is a proton transfer reaction?A reaction in which a proton H⁻ is removed from one species and accepted by another species.
An example of a proton transfer is Brønsted acid reacting with a Brønsted base.
Thus, the proton transfer reaction to form hydrogen cyanide and hydroxide is X⁻ + H₂O → HX + OH⁻
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NEED HELP ASAP PLEASE !!!
Explanation:
H2S is the limiting reagent
H2S= 1/8 (least value)
O2= 1/4
Why can water molecules store energy in more ways than neon atoms?
Select the correct answer.
A. Water molecules can rotate, but neon atoms cannot.
B. Water molecules can collide with other particles more than neon atoms can.
C. Water molecules can change their speed, but neon atoms cannot.
D. Water molecules can absorb heat more easily than neon atoms can.
Answer:
B . Water molecules can collide with other particles more than neon atoms can.
A student finds that the mass of 25mL of an unknown liquid is 20.3g. What is the density of this substance?
Answer:
Explanation:
as we know density is g/ml or d=(g/ml) we will plug in the values in their respective positions and get the answer.
So the density is 0.812(round it according to the sig figs it asks for).
how many moles are needed to make 2.5 L of a 3.8 M solution?
Answer:
9.5
Explanation:
that the answer I hope am correct
___________ in the stomach are responsible for the mechanical digestion that takes place there.
Meta-bromoaniline was treated with nano2 and hcl to yield a diazonium salt. Draw the product obtained when that diazonium salt istreated with each of the following reagents:
Answer:
I believe is the correct answer
Explanation:
100bromoaniline+nano2+hcl
Convert −55 ◦C to Kelvin
Answer:
-459.67 good luck and hope you pass
What is primarily released in radioactive decay?
Answer:
When radioactive atoms decay, they release energy in the form of ionizing radiation (alpha particles, beta particles and/or gamma rays). The energy is called ionizing radiation because it has enough energy to knock tightly bound electrons from an atom's orbit. This causes the atom to become a charged ion.
Explanation:
Why is carbon dioxide a necessary part of the atmosphere.
Answer:
helps to trap heat in our atmosphere
We have more solid volatiles than our other giant members.
what planet is this or planets
Answer:
Jupiter
Explanation:
it's big and the ring around it
What do dark read areas indicated on the map?
Answer: Classifies cultural features, such as populated areas, main roads, and boundaries, on older maps.
What does the energy hill represent on an energy diagram?
A. The potential energy gained by the products when a reaction
happens
B. The potential energy the reactants have stored in molecular bonds
O C. The additional potential energy the reactants must gain in order to
react
D. The final amount of potential energy of the products of the
reaction
B.The potential energy the reactants have stored in molecular bonds
abcdefghijklmnopqrstuvwxyz
Answer:
dam aye someone give this person a medal
Explanation:
Select all the correct answers.
What do scientists use to communicate extremely small measurements?
unit prefixes
A. base units
B. physical models
C. graduated cylinders
D. scientific notation
D
This is when very large or very small numbers must be written. They come in the format or 5.43 x 10^3 or can be written as 8.26E6. The numbers will vary depending on your number.
If an object does Not explode, catch fire, or dissolve, how would you describe this object? (Three answers)
Non-combustible
eg:-glass,water,stone, Portland cement etc ...
Answer:
Noncombustible
Explanation:
Not explode means no blastsCan't catch fire hence no combustionnot dissolve means not reacts with H and OSo
Some examples are ,glass ,stone
How much heat will be absorbed in
boiling 5 grams of ice at 100°c and
at 1 atm?
Describe the process used to balance an equation?
Answer:
Explanation:
When you balance a chemical equation, you change coefficients. You never change subscripts. A coefficient is a whole number multiplier. To balance a chemical equation, you add these whole number multipliers (coefficients) to make sure that there are the same number of atoms on each side of the arrow
fast please 20 points
Answer:
Horse SS and Horse Ss
Explanation:
The horse look the same except for Horse ss
Which statement about London dispersion forces is true?
The London dispersion force is "the weakest intermolecular force"