Answer:
At the equivalence point, equal amounts of H+ and OH– ions will combine to form H2O, resulting in a pH of 7.0 (neutral). The pH at the equivalence point for this titration will always be 7.0, note that this is true only for titrations of strong acid with strong base.
Explanation:
How much energy, in kJ, is released when 27.0 grams of water is cooled from 112C to -15C?
Answer: Q
=
−
53
,
796.6
J
Explanation is right here instead
The equation for heat is
Q
=
m
(
t
f
−
t
i
)
C
p
Q = heat in Joules
m = mass in grams
t
f
= final temp
t
i
= initial temp
C
p
= Specific Heat Capacity
For this problem
Q
=
?
?
?
m
=
275
g
t
f
=
38.4
o
C
t
i
=
85.2
o
C
C
p
=
4.18
j
g
o
C
Q
=
275
g
(
38.4
o
C
−
85.2
o
C
)
4.18
J
g
o
C
Q
=
275
g
(
−
46.8
o
C
)
)
4.18
J
g
o
C
Q
=
−
53
,
796.6
J
The negative Joule value means heat is being lost in an exothermic reaction.
Explanation:
In an experiment using a calorimeter, the following data was obtained:
Mass of calorimeter + water .............150g
Mass of calorimeter ……………………...100g
Final temperature of water …………… 55oC
Initial temperature of water …………. 25oC
What is the total number of Joules absorbed by the water?
Based on the data provided from the experiment using the calorimeter, the heat absorbed by water is 188.1 Joules
What is a calorimeter?A calorimeter is an equipment used in the laboratory to enthalpy change of a reaction.
A calorimeter is insulated to ensure no heat losses or gain from the surroundings.
To determine the Joules of heat absorbed by water, the formula below is used:
Heat absorbed = mass × specific heat capacity × temperature differenceSpecific heat capacity of water = 4.18 J/g.°C
Heat absorbed by water = 15 × 4.18 × (55 - 25)
Heat absorbed by water = 188.1 Joules
Therefore, the heat absorbed by water is 188.1 Joules.
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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).
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.
Which hydrogen of 1-chloropent-2-ene shows the largest chemical (downfield) shift in its nmr spectrum?
The hydrogen of 1-chloropent-2-ene shows the largest chemical shift is C2 or C3 because they are more de-shielded than they have the largest chemical shift value.
Which hydrogen of 1-chloropent-2-ene shows the largest chemical shift in its nmr spectrum?Generally, There is the biggest chemical shift at C2 or C3 due to the fact they are connected through the pi- bond and range is about 4.5 - 6 ppm and C1 has a range of about 3.5 due to Cl- ion.
In conclusion, C2 or C3 is more de-shielded than they have the largest chemical shift value.
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What is the relationship between the electron configuration of an element and the period in which that element appears in the periodic table?.
Answer:
The links are: the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in. the number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.
Explanation:
How much heat will be absorbed in
boiling 5 grams of ice at 100°c and
at 1 atm?
___________ in the stomach are responsible for the mechanical digestion that takes place there.
What do dark read areas indicated on the map?
Answer: Classifies cultural features, such as populated areas, main roads, and boundaries, on older maps.
Can someone please help me? :( giving brainliest
Answer:
A and C
Explanation:
I chose these answers because a longer range of time would give a better representation of the climate.
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
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.
1) What happens when the pressure above the surface of a liquid is equal to the vapor
pressure of the liquid? Explain.
2)If the pressure on the surface of water in the liquid state is 30 kPa, the water will
boil at what temperature?
3) What is the vapor pressure of ethanol at its normal boiling point?
4) As the pressure on a liquid is changed from 100. kPa to 120.0 kPa, what happens to the
boiling point? Explain your answer.
5). Which substance has the lowest vapor pressure at 75°C?
(1) water (3) ethanoic acid
(2) propanone (4) ethanol 5 _____
6). According to Reference Table H, what is the vapor pressure of propanone at 45°C?
(1) 22 kPa (3) 70. kPa
(2) 33 kPa (4) 98 kPa 6 _____
7). The boiling point of a liquid is the temperature at which the vapor pressure of the liquid is equal to the pressure on the surface of the liquid. What is the boiling point of propanone if the pressure on its surface is 48 kilopascals?
(1) 25°C (3) 35°C
(2) 30.°C (4) 40.°C 7 ________
8) A liquid boils when the vapor pressure of the liquid equals the atmospheric pressure on the surface of the liquid. Using Reference Table H, determine the boiling point of water when the atmospheric pressure is 90. kPa. _____________
Table F: Solubility Guidelines
1. Based on the Solubility Guidelines chemistry reference table, a saturated solution of
Which salt would be most concentrated?
A) ZnCl2 B) AgCl C)BaSO4 D) PbCrO4
Explain your answer.
________________________________________________________________________
2. Based on the Solubility Guidelines chemistry reference table, which saturated solution
would be the least concentrated?
A) barium sulfate B) sodium sulfate C) potassium sulfate D) lithium sulfate
Explain your answer.
________________________________________________________________________
3. Solutions of AgNO3 (aq) and KCl (aq) are mixed. Will a visible reaction occur? Fill in
the missing parts to the reaction and explain your answer.
AgNO3(aq) + KCl(aq) ___________ + ____________
________________________________________________________________________
4. Which solution will undergo a double replacement reaction with Na2CO3 (aq) to produce
a white solid substance?
A) CaCl2 (aq) B) LiCl (aq) C) KCl (aq) D) NH4Cl (aq)
5. In the laboratory, a student mixes aqueous solutions of NiSO4 and NaOH. What will be
the result of this experiment?
________________________________________________________________________
When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling of liquid will begin.
What happens when atmospheric pressure is equal to the vapor pressure of liquid?When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling will begin. The bubbles formation started to the liquid molecules which have gained enough energy to change to the gaseous phase.
The vapor pressure of ethanol is 5.95 kPa at 20.0 °C, and its vapor pressure is 53.3 kPa at 63.5 °C.
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Convert −55 ◦C to Kelvin
Answer:
-459.67 good luck and hope you pass
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
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
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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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:
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.
NEED HELP ASAP PLEASE !!!
Explanation:
H2S is the limiting reagent
H2S= 1/8 (least value)
O2= 1/4
what do you get when you mix H2O And Co3987b2
Answer:Potassium metal reacts very rapidly with water to form a colourless solution of potassium hydroxide (KOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.
Explanation:
Which ecosystem is more likely to become unstable one with many kinds of plants and animals or one with few kinds?
Answer:
One with a few kinds is more likely to become unstable.
Explanation:
A lack of biodiversity means there is a lower chance of them having traits that enable them to adapt to a changing environment. A lack of biodiversity is usually caused by humans. It could be the result of habitat loss, invasive species, overexploitation, pollution, or climate change.
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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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
fast please 20 points
Answer:
Horse SS and Horse Ss
Explanation:
The horse look the same except for Horse ss
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:
Which statement about London dispersion forces is true?
The London dispersion force is "the weakest intermolecular force"
A student adds 0. 0030 mol of hcl to 100 ml of a 0. 10 m solution of a r2nh, a weak base. The ph of the solution is found to be 11. 10
Since an acidic salt solution is produced when a strong acid neutralizes a weak base, the pH of the salt solution formed when HCl is added to R2NH will be less than 7.
What is a neutralization reaction?A neutralization reaction is the react ion between an acid and a base to form salt and water only.
Neutralization reactions can either produce a neutral solution, an acidic solution or an alkaline solution at equivalence point.
When a strong acid is added to a weak base, the pH of the salt solution formed will be less than 7.
Therefore, the pH of the salt solution formed when HCl is added to R2NH will be less than 7.
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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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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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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