Given that the volume of the pure water is 480 mL and the mole of HCl added to the water is 2×10¯² mole. Therefore, the Initial and final pH of the water are:
1. The initial pH of the pure water is 7
2. The final pH of the water is 1.38
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
pH scaleThe pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.
The scale ranges from 0 to 14 indicating:
0 to 6 indicates acid 7 indicates neutral (pure water) 8 to 14 indicate basicHow to determine the molarity Volume = 480 mL = 480 / 1000 = 0.48 L Mole of HCl = 2×10¯² mole Molarity =?Molarity = mole / Volume
Molarity = 2×10¯² / 0.48
Molarity = 4.17×10¯² M
Dissociation equationHCl(aq) —> H⁺(aq) + Cl¯(aq)
From the balanced equation above,
1 mole of HCl contains 1 mole of H⁺
Therefore,
4.17×10¯² M HCl will also contain 4.17×10¯² M H⁺
How to determine the pH Hydrogen ion concentration [H⁺] = 4.17×10¯² MpH =?pH = –Log H⁺
pH = –Log 4.17×10¯²
pH = 1.38
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If we have 100ml of water at 0 degrees Celsius and it all freezes, how much energy did the water lose? Using the formula Hfus = Q/n
The amount of heat energy lost by the 100 mL of water when it all freezes is 33400 J
Data obtained from the question Volume of water = 100 mL Heat (Q) =? How to determine mass of water Volume of water = 100 mL Density of water = 1 g/mL Mass of water =?
Mass = Density ×Volume
Mass of water = 1 × 100
Mass of water = 100 g
How to determine the heat Mass of water = 100 gHeat of fusion (ΔHf) = 334 J/g Heat (Q) =?Q = m × ΔHf
Q = 100 × 334
Q = 33400 J
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Perform the following operation
and express the answer in
scientific notation.
9.2x10^7 ÷ 3.7x10^9
Answer:
coefficient green : 2.4865
exponent (yellow) : 16
Explanation:
On the moon, there is no air resistance. What forces (F) are acting on the hammer and
feather as they fall? How do you know?
Answer:
Gravitional Force
Explanation:
Every planet has a gravitational pull which attracts all objects; the moon is no exception. It says forces in the question but I know for sure gravitational force is apart of it.
zz. Compound A is crystalline, has a high melting point, and is more conductive when dissolved. Compound B is highly conductive and can be hammered into different shapes. Compound
Cis not highly conductive and is a gas. Which of these compounds is covalent?
compound A
compounds
compound
Nane at these compounds is covalent
Answer:
Compound C is covalent.
Explanation:
Among the properties of a covalent compound is that it has poor conductivity and could possibly be a gas at room temperature.
i don’t really know how to do this and need help
Answer:
Explanation:
To round the number to 3 significant figures, look at the first 4 digits: 3545 which will round to 355. The number in 3 significant figures will be 3,550,000.
[tex]\\ \sf\Rrightarrow 3545530[/tex]
[tex]\\ \sf\Rrightarrow 354553[/tex]
[tex]\\ \sf\Rrightarrow 35455[/tex]
[tex]\\ \sf\Rrightarrow 3545[/tex]
[tex]\\ \sf\Rrightarrow 355[/tex]
A student used 1.2 g of hydrate in the first trial and 1.6 g in the second trial. Explain fully why her mass percent of water will be the same for both trials even though she used more hydrate in the second trial. (Do not simply state that the mass percent is an intensive property ).
Both trials of 1.2 g and 1.6 g will have the same mass percent of water because the ratio of the salt to the water of hydration is always constant for any hydrated salt.
Water of hydrationFor every hydrated salt, the ratio of the salt to the water of hydration remains constant irrespective of the amount of salt taken for experimental analysis.
For example, assuming the mass percent of water in 10g of a hydrated salt is 40%, if 100g of the same salt is taken, the mass percent will remain 40%.
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Ancient
grew to 40 m, but are smaller today.
Answer:
Club mosses
Explanation:
hope this helps
2) Usually, when the particle size is decreased, what will happen to the rate of dissoving?
A) It will stop.
B) It will increase.
C) It will decrease.
D) It will remain constant.
A bicycle tire has a volume of 1. 0 L at 22°C. If the temperature of the tire is increased to 52°C, what is the resulting volume of the tire? Type in your answer using the correct number of significant figures. Use the formula for Charles' Law: V1 T1 = V2 T2 L.
The resulting volume of the tire would be 1.1 L
What is Charles's law?According to this law, the volume of a given gas is directly proportional to its temperature, provided that the pressure remains constant.
The law can be presented mathematically as;
[tex]\dfrac{V_1}{T_1} =\dfrac{V_2}{T_2}[/tex]
In this case, V1 = 1.0 L, T1 = 22 °C (295 K), T2 = 52 °C (325 K).
[tex]V_2=\dfrac{V_1T_2}{T_1}[/tex]V
[tex]V_2=\dfrac{1\times 325}{295}=1.1\ L[/tex]
Hence the final volume of the tire will be 1.1 L
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Which statement about London dispersion forces is true?
The London dispersion force is "the weakest intermolecular force"
How does weathering help to create soil? Please Help Asap
Weathering adds organic material to the soil.
Weathering builds up the rocks that create the deepest soil layer.
Weathering compacts small particles into larger rock pieces.
Weathering breaks parent material into smaller pieces.
Answer:
D. Weathering breaks parent material into smaller pieces.
Explanation:
I believe it is D. because weathering breaks down and loosens it into smaller pieces.
I hope it helps! Have a great day!
Muffin ^^
Answer:
Your answer would be:
D.) Weathering breaks parent material into smaller pieces.
Explanation:
Weathering breaks down and loosens the surface minerals of rock. The broken rocks are transported to another place where it decomposes and forms soil. Therefore weathering is important for soil formation. Without it, there will be likely less soil.
Have a great rest of your day
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Hello people ~
Which of the following reactions can also be termed as thermal decomposition reaction?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Double displacement reaction
Answer:
Decomposition reaction
Explanation:
When a single reactant is decomposed into two or more products that reaction is called decomposition reaction.
Thermal decomposition usually refers to exothermic reactionA lots of amount of heat is released in thisOption B is correct
What increases the rate a solute dissolves in a solvent.
Answer:
Stirring
Explanation:
Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster.
Answer:
crushing particles of solute
Explanation:
Which statement describes the BEST example of animals avoiding competition?
A.
A bee pollinates a flower.
B.
Cheetahs and lions feed on the same prey.
C.
A bird finds a spot in a tree to put a nest.
D.
A family of deer leave a crowded area of forest.
Answer:
D
Explanation:
If the deer leave the forest then they are avoiding compotation
How and Why did the Nazis dehumanized the Jews?
Topic sentence:
Text evidence:
Conclusion:
(Can someone help me out pls)
Answer:
Its because Hitler thought that there beliefs were trasha dn thought that these humans were worthless so he went out of his way to "DEHUMANIZE" them.
Explanation:
All of the following are true about scientific theories, except:
O A theory is an explanation of why
something happens.
O Theories must have been extensively
tested.
O A theory can be the result of one
scientific investigation.
O Theories are based on many
observations.
Why isn't this structure possible for an isomer of butanoic acid? Like why does the acid group always be on the end of a molecule?
It is not possible for the structure to be an isomer of butanoic acid because it consists of 5 carbon atoms.
What is an isomer of butanoic acid?An isomer of butanoic acid is a chemical compound with the same molecular formula but a different structural arrangement of its atoms.
Butanoic acid, also known as butyric acid, has the molecular formula C₄H₈O₂. It is a carboxylic acid with a straight-chain arrangement of four carbon atoms.
One isomer of butanoic acid is called isobutyric acid (2-methylpropanoic acid). Isobutyric acid has the same molecular formula C₄H₈O₂, but its carbon atoms are arranged in a branched structure.
So from the given structural formula, it is not possible for the structure to be an isomer of butanoic acid because it consists of 5 carbon atoms.
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How long does sucrose take to decompose?
Please need help with that!
Answer:
> 50h of holding at 120 °C in a sealed pan
Explanation:
The loss of crystaline structure of sucrose was reported at various temperatures, but decompose.
True or false: water is weird. Normally the solid form of a substance is more
dense/compact than the liquid form. When water freezes it forms
crystalline structures that make the molecules spread out causing ice to be
less dense than water and float. This is true of all substances.
Answer:
this would be true friend :)
Explanation:
for density, it generally goes solids, liquids, then gas in order from most dense, to least dense.
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PLS ANSWER ME QUICK!!
CaO mass is 25 grams
CO2 volume is 144 liters
CaO + CO2 = CaCO3
what is the mass of CaCO3?
Answer:
100.09 amu is the answer.
Answer:
45g
Explanation:
first we will find out which is the limiting reactant (hope you know how to find it)
Cao is the limiting reactant
so
we will find the number of moles of cao which is 0.45 mol
as according to the equation cao and caco3 have ratios 1:1 so both will have the same no. of moles
then by multiplying 0.45mol by 100 (mr of caco3) we will get the mass of caco3 which is 45g
HELP1!!!!!!!!!!!!!!!!!!!!!!!!!!!111
Answer:
I believe c
Explanation:
ohesion between water molecules contributes to __________ which allows the molecules to stick together and resist outside forces.
Answer: I believe the answer is surface tension :)
12. You want to create a 0. 55M Potassium Chloride solution. You mass 3. 00 grams of Potassium chloride
How much water is needed?
I suppose that you want to produce a 0.25 M solution of KCl
You do not want tp produce 0.25 mol of KCl.
Molar mass KCl = 39.1 + 35.45 = 74.55 g/mol
Mass of 0.25 mol KCl = 0.25 mol * 74.55 g/mol =18.64 g
To produce a 0.25 M solution of KCl = 18.64 g would require a solution volume of 1.0 L or 1000 mL
You have only 5.00 g ( NOT 5.00 gm) of KCl
Volume of solution required = 5 g / 18.64 g * 1000 mL = 268 mL solution
You dissolve the 5 g KCl in some water and then make up the final solution volume to 268 mL
This does NOT mean that you dissolve the 5 g KCl in 268 mL water .
Which sphere is the troposphere a part of?
Select one:
the geosphere
the biosphere
the hydrosphere
the atmosphere
Answer:
The atmosphere is your answer
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List five factors that can affect levels of dissolved oxygen in water:
Answer:
Aquatic life
Elevation
Salinity
Temperature
Explanation:
Aquatic life- animals living in water use up dissolved oxygen.
Elevation- the amount of oxygen in elevation increases.
Salinity- Salty water holds less oxygen than fresh water.
Temperature- cold water holds more dissolved oxygen than warm water.
How does an electron move from the ground state to an excited state?
Answer:
It goes through a process called absorption. This is when an atom absorbs the energy from its surroundings. The electrons move from the ground state to the excited state because of this process. Once the atoms absorb energy, that affects the inner development when shifting to a new state of being.
Explanation:
The process that is known as absorption is when an atom absorbs energy from its surrounding racing it's energy level causing it to go into an excited state or highly-reactive state. When an atom goes through this process, electrons absorb the energy and raise to higher energy levels, therefore raising the stage of itself. This is how it gets into a excited state.
correct answer is A
a detailed explaination would be appreciated
Answer:
yh correct answer is A
Explanation:
the reason is because
During the course of a catalytic reaction the following occurs: 1) Substrate is covalently bound and oriented with proximity to the active site residues. 2) Negative charge builds up on the substrate and is stabilized. 3) Oxidation of the enzyme followed by reduction to complete the catalytic cycle. What type of chemical species can facilitate these reactions? A) nucleophilic amino acids B) electrophilic groups C) prosthetic phosphate groups D) transition metal anions E) transition metal cations
During the course of a catalytic reaction Substrate is covalently bound and oriented with proximity to the active site residues.
The type of chemical species which can facilitate these reactions is transition metal cations.
What is an Enzyme?These are proteins that act as biological catalysts and accelerate chemical reactions.
They function by binding to the substrate and requires the use of transition metal cations which acts as cofactors.
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Writing a Scientific Argument
Write a scientific argument that answers the question Why is the liquid oxygen machine producing less liquid oxygen than normal?
State your claim and use evidence to support it. For each piece of evidence you use, explain how the evidence supports your claim or refutes another claim. Remember to explain what happened at both the macro and molecular scales.
Answer: The liquid oxygen machine is producing less liquid oxygen than normal because there's a low attraction between the molecules.
It should be noted that oxygen in its liquid state will take up less space. It can also be stored at a lower pressure than when it's in its gaseous state.
Explanation:
From the complete question, the liquid oxygen evaporates at a slightly higher The reason for this is due to the fact that they have similarly low attraction between molecules.
Place the following in order of decreasing radius.
Te2- F- O2-
Answer:
Option 2 is correct.