which one of the following aqueous solutions will have a ph of 2.00 at 25 °c? (kw = 1.01 ´ 10–14) question options: a) 10.0 m kcl b) 10.0 m hbr c) 0.010 m hcl d) 2.0 m naoh e) 0.020 m hno3
Answers
The pH of a 0.010 M HCl solution is 2.00, which is the same as the pH specified in the question. The correct answer is option C) 0.010 M HCl.
The pH of the aqueous solution is determined by the formula pH = -log[H+], where H+ represents the hydrogen ion concentration of the solution. The pH of the solution indicates how acidic or basic it is. A pH value of 7 represents neutrality, while a pH value less than 7 is considered acidic, and a pH value greater than 7 is considered basic.The question is asking which of the following aqueous solutions will have a pH of 2.00 at 25 °C.
We must first consider that the pH scale ranges from 0 to 14, with 0 being the most acidic and 14 being the most basic. Therefore, a pH of 2.00 indicates a very acidic solution. The value of Kw represents the ionization constant of water and is equal to 1.01 × 10-14 at 25°C. The correct answer is option C) 0.010 M HCl, which is the only solution that can produce a pH of 2.00.
The hydrogen ion concentration of a 0.010 M HCl solution is calculated by using the formula H+ = √(Kw/HCl). The H+ concentration in a 0.010 M HCl solution is 1.00 × 10-2, and the pH of a 0.010 M HCl solution can be calculated using the formula pH = -log[H+].
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Related Questions
which statement describe a species adapting to changes in it’s environment?
Answers
Answer: Example: The water in a species envirmoent suddenly becomes more acid therefore, the species adapts it's body to become more resistent and tolerate to chemicals.
This might also give it an adavantage to the species who have not yet adapted to the change
Explanation: There are three type of adaptions. 1) Structural 2) Behavioral 3) Physiological
I need help with question 2 please help quickly this is due in 3 hours! For this activity,
you need to find reliable Internet or library sources about energy resources. You will
research their advantages and disadvantages. Advantages are positive impacts, or
benefits. Disadvantages are negative impacts. Resources include coal, oil, natural gas,
nuclear power, biomass, wind, hydropower, geothermal energy, and solar energy. Their
positive and negative effects can depend on how they are obtained and the pollution they
cause when used. Their effects may also depend on how much the resource we use.
How much we use a resource can be described by its per capita consumption.
I
Part 1: Identifying Sources (5 points)
2. Identify three websites you will use to start your research. If you use other websites to
complete the research questions in Part 2, add them to this list. Cross out any websites
that don't end up helping you complete the activity. (3 points)
Answers
Coal is abundant and cost-effective, providing stable energy.
Coal extraction damages the environment, and burning it releases high levels of CO2 and air pollutants. Oil has high energy density and infrastructure, but its combustion contributes to climate change and spills cause environmental harm.
Natural gas emits less CO2, is versatile, and is abundant, but extraction techniques like fracking can harm ecosystems and water resources. Nuclear power produces large amounts of electricity without CO2 emissions but faces concerns about radioactive waste disposal and safety risks. Biomass is renewable but competes with food production and can release emissions.
Wind, solar, hydro, and geothermal offer renewable sources, but their scalability, intermittency, and land use impacts vary. Per capita, consumption affects the magnitude of their environmental effects.
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20 POINTS !!!!
What is a homogeneous mixture?
Answers
a sample of an unknown isotope decays according to the figure. what is the half-life?
Answers
In order to determine the half-life of an unknown isotope, we need to examine its decay curve. The half-life of an isotope is the amount of time it takes for half of the sample to decay.
We can see that the initial activity is 100%. After one half-life has passed, the move has decreased to 50%. After another half-life, the action is 25%. After a third half-life, the movement is 12.5%, and so on. To find the half-life, we need to determine how much time it takes for the activity to decrease to half its initial value. In this case, we can see that the activity decreases from 100% to 50% after one half-life has passed.
Therefore, the half-life of the unknown isotope is the time it takes for one-half of the sample to decay, which is equal to the time it takes for the activity to decrease to half of its initial value. From the figure, we can estimate that the half-life is approximately 3 hours. In summary, the half-life of the unknown isotope is the time it takes for half of the sample to decay, and in this case, it appears to be approximately 3 hours.
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What is this answer helpp
Answers
The answer is the properties of noble gas. The following correct two answers are :-
A colorless and odorless gasNon-reactiveThe noble gases are colorless, odorless, tasteless, and nonflammable under popular conditions. They have been once categorized institution zero in the periodic table because it become believed they'd a valence of zero, meaning their atoms can't combine with the ones of other elements to form compounds.
The most considerable property of the noble gases, group 18 is their state of being inactive. They occur in low concentrations within the surroundings. They locate makes use of as inert atmospheres, neon signs and symptoms, and as coolants. The 3 heaviest noble gases react with fluorine to form fluorides.
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b
Identify a compound composed of
molecules
Answers
Answer:
nitrogen oxides and hydrogen
An organic compound was analyzed and found to contain 70. 6% carbon, 5. 9% hydrogen, and 23. 5% oxygen by mass. Additionally, the molar mass of the compound was experimentally determined to be 136 g/mole. What is the molecular formula for the compound? how many grams of mgcl 2 would be required to prepare 250 ml of a 0. 8 m solution of that solute in water? please report your answer to two digits after the decimal place.
Answers
The correct answer is C8H8O2.
What is organic compound?Organic combinations are a substance that contains covalently- bonded carbon and hydrogen and often with other ingredients. Organic compounds examples are benzoic Acid, aromatic mixtures, benzoic aldehyde, propanoic acid, butanoic acid, malonic acid, amines, heterocyclic compounds, VOC, benzoic acid, and diethyl malonate.organic compound, any of a large class of chemical combinations in which one or more atoms of carbon are covalently linked to atoms of other elements, most generally hydrogen, oxygen, or nitrogen. The few carbon-containing combinations not categorized as organic comprise carbides, carbonates, and cyanides.Organic compounds important to human functioning include carbohydrates, lipids, proteins, and nucleotides. These mixtures are said to be organic because they include both carbon and hydrogen.To learn more about organic compound, refer to:
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Why does water dissolve polar crystals like potassium permaganate?
water is polar
water is nonpolar
water is neutral
water has more density
Question 2
Help plz
Answers
Answer:
is water polar? dissolves in water because the energy released when bonds form between the K+ ion and the negative end of the neighboring water molecules and between the MnO4- ion and the positive end of the solvent molecules compensates for the energy it takes to separate the K+ and MnO4- ions. dissolves in water because the energy released when bonds form between the K+ ion and the negative end of the neighbor
Explanation:
a student prepares a solution by combining 100 ml of 0.30 m hno2(aq) and 100 ml of 0.30 m kno2(aq). which of the following equations represents the reaction that best helps to explain why adding a few drops of 1.0 m hcl(aq) does not significantly change the ph of the solution?
HNO2 + HâO NO + HâO k(aq) + Cl(aq) â KCl(s) HNO3(aq) - H*(aq) + NO, (aq) C H(aq) + OH (aq) â H20(1) H(aq) + NO2 (aq) â HNO2(aq)
Answers
The equation that best helps to explain why adding a few drops of 1.0 M HCl(aq) does not significantly change the pH of the solution is: HNO2(aq) + H+(aq) ⇌ NO2-(aq) + H2O(l)
HNO2 is a weak acid, and when it reacts with water, it forms the H+ ion and the NO2- ion. The reaction is reversible, and the acid dissociation constant (Ka) for HNO2 is relatively small, indicating that HNO2 does not ionize completely in water. When a few drops of HCl are added to the solution, H+ ions are introduced, which shifts the equilibrium towards the reactants, producing more NO2- ions. However, since HNO2 is a weak acid, the pH of the solution does not change significantly.The other equations listed are not directly related to the reaction of HNO2 with HCl or do not involve the formation of NO2-, which is the species that is most affected by the addition of HCl to the solution.
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What should the IUPAC name for a binary covalent compound lack? prefixes Roman numerals an -ide ending the name of a nonmetal.
Answers
The IUPAC name for a binary covalent compound will lack roman numerals.
Binary covalent compound comprises of two elements which forms a
compound through the sharing of electrons.
The sharing of electrons is referred to as covalent bonding and naming such
compounds require prefixes such as mono-, di- , tri- etc.
The standard method of naming these compounds should be with the
prefixes and not with the roman numerals.
An example is carbon(IV)oxide which is wrong in IUPAC naming.
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Answer:
B
Explanation:
Just did the test on edge 2021
When should a lab coat, safety goggles, and gloves be worn in the laboratory?
always, no exceptions
always, unless the teacher instructs otherwise
only when the teacher says to wear them
never in chemistry labs
Answers
Answer: the answer is a
Explanation:
you should always keep lab coat on when in lab
Answer:
its A. chemistry labs have a lot of things that can hurt you, even with just a few drops . its one of the most dangerous experiment types you do in science. even if your not doing an experiment but your in the room you should have on protection in case of a spill or something. it is always impotent to have safety gear on. even more so in chemistry
Examine the chemical reaction.
C3H8+—>4H2O+3CO2
What coefficient of Oz should be added so the number
of atoms of oxygen is conserved on both sides of the
reaction equation?
i don’t know if this is chemistry
Answers
Answer:
5
Explanation:
What do both plants and animal cells break down for energy?
Answers
Answer:
both plant and animal cells must break down food molecules to get energy from them
how many carbon atoms are in C6H14N4O2
a.4
b.2
c.6
d.14
Answers
Answer:
6
Explanation:
Answer:
6
Explanation:
C6
Carbon 6
Explain why rinsing your hands in lemon juice would make them less slick.
Answers
Answer:
Washing your hands with lemon juice does not have any beneficial effects.
Explanation:
washing with lemon juice does not protect against any major diseases.
a tank contains 8l of water in which is dissolved 32 g (grams) of chemical. a solution containing 2 g/l of the chemical flows into the tank at a rate of 4 l/min, and the well-stirred mixture flows out at a rate of 2 l/min. determine the amount of chemical in the tank after 20 minutes. show all work and setup.
Answers
A tank contains 8l of water in which is dissolved 32 g (grams) of chemical. a solution containing 2 g/l. The amount of chemical in the tank after 20 minutes is 98.66 g.
Given that:
rate r1 = 4 L/min
rate r2 = 2 L/min
concentration c1 = 2 g/L
V(0) = 8 L
A(0) = 32 g
the equation is given as :
ΔV = r1 Δt - r2Δt
dV/dt = 2
integrating the condition , we get
V(t) = 2(t+4)
ΔA = c1r1 Δt - c2r2 Δt
dA/ dt = 8-2c2
c2 = A/ V
dA/dt = 8 - 2A/ V
now by putting the value of V, we get
dA / dt + 1 / t + 4 A = 8
linear equation has integrating factor :
I = e^ ∫ 1/( t + 4) dt = t + 4
d [ ( t + 4)A] / dt = 8 (t + 4)
(t+ 4 )A = 4(t + 4)² + c
A(t) = (1 / t + 4 ) [ 4(t + 4)² + c]
A(0) = 32 means c = 64
A(20) = (1/6) [(24)² + 16]
= 296 / 3
= 98.66 g
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Why the planets are arranged as they are in our solar system.
Answers
Answer:
The order and arrangement of the planets and other bodies in our solar system is due to the way the solar system formed. Nearest the Sun, only rocky material could withstand the heat when the solar system was young. For this reason, the first four planets—Mercury, Venus, Earth and Mars—are terrestrial planets.
Explanation:
Which of the following best describes an exothermic reaction?
O A chemical reaction that absorbs heat from its environment
O A chemical reaction that releases heat into its environment
O
A chemical reaction that absorbs and releases heat
Answers
Answer: A chemical reaction that releases heat into its environment
Explanation:
the exothermic process is a process or reaction that releases energy, (usually in the form of heat but also in light, electricity, or sound) into its environment
ex:
think of ice freezing, to change from a liquid to a solid it must release heat to lower it’s temperature to reach its freezing point
Investigate: note the empty jars on the shelf that can be filled by using the slider. set the amount to 2.000 moles of carbon (mol c), then press start. each jar holds exactly one mole of carbon. your goal is to determine the mass in grams of two moles of carbon.
before you can find the mass, what do you need to know?
turn on show molar mass. what is the molar mass of carbon?
what do you think the mass of 2.000 moles of carbon will be?
drag the jars to the balance. what is the mass of 2.000 moles of c?
Answers
Before finding the mass of 2.000 moles of carbon, we need to know the molar mass of carbon.
By turning on the show molar mass feature, we can see that the molar mass of carbon is 12.01 g/mol. To determine the mass of 2.000 moles of carbon, we need to multiply the number of moles by the molar mass. Therefore, the mass of 2.000 moles of carbon will be 24.02 grams (2.000 mol x 12.01 g/mol). By dragging the jars to the balance, we can verify that the mass of 2.000 moles of carbon is indeed 24.02 grams. To determine the mass of 2.000 moles of carbon, you need to know the molar mass of carbon. The molar mass of carbon is 12.01 g/mol. To find the mass of 2.000 moles of carbon, multiply the moles by the molar mass: 2.000 moles * 12.01 g/mol = 24.02 g. Therefore, the mass of 2.000 moles of carbon is 24.02 grams. When you drag the jars to the balance, the mass should be 24.02 grams.
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1 point
Given the unbalanced equation below. When the equation is correctly
balanced what is the coefficient in front of O2?*
Al(s) + O2(g)
O2(g) →_Al2O3(s)
1)6
2. 2
3. 3
4. 4
Answers
Answer:
bbecause it make the answer
When the volume of a gas is
changed from 250 mL to 425 mL, the temperature will change from 137°C to_____°C.
Answers
Answer:
\(\boxed {\boxed {\sf 232.9 \textdegree C}}\)
Explanation:
This question asks us to find the temperature change given a volume change. We will use Charles's Law, which states the volume of a gas is directly proportional to the temperature. The formula is:
\(\frac {V_1}{T_1}= \frac{V_2}{T_2}\)
The volume of the gas starts at 250 milliliters and the temperature is 137 °C.
\(\frac{250 \ mL}{137 \textdegree C}= \frac{V_2}{T_2}\)
The volume of the gas is increased to 425 milliliters, but the temperature is unknown.
\(\frac{250 \ mL}{137 \textdegree C}= \frac{425 \ mL}{T_2}\)
We are solving for the new temperature, so we must isolate the variable T₂. First, cross multiply. Multiply the first numerator and second denominator, then multiply the first denominator and second numerator.
\(250 \ mL * T_2 = 137 \textdegree C * 425 \ mL\)
Now the variable is being multiplied by 250 milliliters. The inverse of multiplication is division. Divide both sides of the equation by 250 mL.
\(\frac{250 \ mL * T_2}{250 \ mL}=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}\)
\(T_2=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}\)
The units of milliliters (mL) cancel.
\(T_2=\frac{ 137 \textdegree C * 425 }{250 }\)
\(T_2= \frac{58225}{250} \textdegree C\)
\(T_2=232.9 \textdegree C\)
The temperature changes to 232.9 degrees Celsius.
The substance that speed up the digestion stop working when they have been boiled, what does asim need to put in a fourth test tube to test this in his experiment?
Answers
He needs to put some pancreatic blood in a test tube to test for the functioning of digestion enzymes produced by the pancreas.
The objective of this experiment is to identify the substrates and substances.
An enzyme is a substance that acts as a catalyst to speed up a biochemical process. They also help in to speed up the digestion process.
The main the purpose of this experiment is to check why these enzymes aren't working properly. A pancreatic blood test needs to be done in a test tube to find out the reasons.
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What is the theoretical yield of H 20 that can be obtained from the reaction of 4.5 g H 2 and excess O 2?
2H 2(g) + O2(g) → 2H 20(g)
4.5 g
40.8
80.g
9.0 g
81g
Answers
Answer:
9.0g
Whabshsbzhz sbsj dhbxjsbxjz sbsbbsbsjs
Explanation:
cause I believe
What do electron capture and positron emission have in common?
Answers
Answer:
They both keep the mass number the same while bringing the atomic number down 1
Explanation:
Answer:
They both keep the mass number the same while bringing the atomic number down 1.
Thank the person above or below! Whoever said this answer just wanted to answer it so I could keep my streek, sorry!
According to the following map, what is a type of mineral found in Mexico?
a | Bauxite
b | Copper
c | Gold
d | Zinc
Answers
Answer:
B) copper
Explanation:
According to the map, iron, silver, and copper are found in Mexico. That makes B) copper your answer, as it is the only one that shows up for both the answer choices as well as the map.
The answer is d but can anyone explain why and if not don't answer
Answers
Answer:
because the reaction can always be accelerated by heat
The two
stages of photosynthesis in plants showing their chemical reactions
Answers
Answer:
absorption of light and Carbon Fixation
Explanation:
i need help balancing the equation and number 4
Answers
Explanation:
I hope this helps answer your questions
silver has an atomic mass of 107.868 amu. silver has two common isotopes. one of the isotopes has a mass of 106.906 amu and a relative abundace of 51.881%. a. what is the % abundance of the other isotope. b. what is the mass if the other isotope.
Answers
A. The abundance of the 2nd isotope is 48.119%
B. The mass of the 2nd isotope is 108.905 amu
Let the 1st isotope be A
Let the 2nd isotope be B
A. Determination of the abundance of the 2nd isotope
Abundance of isotope A = 51.881%.
Abundance of isotope B =?Abundance of B = 100 – A
Abundance of B = 100 – 51.881
Abundance of B = 48.119%B. Determination of the mass of the 2nd isotope
Atomic mass of silver = 107.868 amu.
Mass of 1st isotope (A) = 106.906 amu
Abundance of isotope A (A%) = 51.881%.
Abundance of isotope B (B%) = 48.119%
Mass of 2nd isotope (B) =?\(atomic \: mass = \frac{mass \: of \:A \times \:A\%}{100} + \frac{mass \: of \:B \times \:B\%}{100} \\ \\ 107.868 = \frac{106.906\times \ \: 51.881}{100} + \frac{mass \: of \:B \times \:48.119}{100} \\ \\ 107.868 = \: 55.464 + 0.48119 \times mass \: of \:B \\ \\ collect \: like \: terms \\ \\ 0.48119 \times mass \: of \:B = 107.868 - 55.464 \\ \\ divide \: both \: side \: by \: 0.48119 \\ \\ mass \: of \:B = \frac{107.868 - 55.464 }{0.48119} \\ \\ mass \: of \:B =108.905 \: amu \\ \\ \)
Therefore, the mass of the 2nd isotope is 108.905 amu
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which of the following pairs of species would generate a salt derived from a weak acid and a weak base? select the correct answer below:
a. HI and K3PO4 b. HBr and KCH3COO
c. H2O and NaOH d. NaNO2 and H2CO3
Answers
NaNO2 and H2CO3 (d), this is because NaNO2 is derived from a weak acid (nitrous acid) and a strong base (NaOH), while H2CO3 is derived from a weak base (carbonate) and a weak acid (H2O + CO2).
When NaNO2 and H2CO3 react, they will form a salt that is derived from a weak acid and a weak base. It is important to note that HI and K3PO4 would form a salt derived from a strong acid and a strong base, HBr and KCH3COO would form a salt derived from a strong acid and a weak base, and H2O and NaOH would form a salt derived from a strong base and a weak acid.
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