Answer:
[OH⁻] = 0.00524
Explanation:
Given that,
The value of pOH of a solution is 2.28
We need to find the [OH-] in a solution. We know that,
[tex]pOH=-\text{log}[OH^-][/tex]
Put all the values,
[tex]2.28=-\log[OH^-]\\\\=0.00524[/tex]
So, the value of [OH-] in a solution is equal to 0.00524.
How speak fluent English.
Answer:
practise, because it helps you get comfortable in speaking english
and there is also a quote that says "practise makes perfect"
Explanation:
HOPE IT HELPS
How does natural selection contribute to total biodiversity?
Answer:
Natural selection says that either they evolve differently and increase their biodiversity or they die. Both wouldn't have enough food to survive so animals with those traits would become less and less common. ... Natural Selection can also decrease the biodiversity.
Answer: Increase their biodiversity or they die
Explanation:
Both wouldn't have enough food to survive so animals with those traits would become less and less common. ... Natural Selection can also decrease the biodiversity.
so no one go help me wit my chemistry huh
Answer:
depends...
on how difficult it is
Which is NOT a way to accelerate an object? *
2C2H2 + 5O2 → 4CO2 + 2H2O
Which of the following statements would be correct if one mole of C2H2 was used in this reaction? (5 points)
a
One mole of oxygen was used in this reaction.
b
Five moles of oxygen were used in this reaction.
c
Four moles of carbon dioxide were produced from this reaction.
d
Two moles of carbon dioxide were produced from this reaction.
Answer:
d. Two moles of carbon dioxide were produced from this reaction
Explanation:
The given chemical reaction can be written as follows;
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
From the above chemical reaction, we have;
Two moles of C₂H₂ reacts with five moles of O₂ to produce four moles of CO₂ and two moles of H₂O
We have;
One mole of C₂H₂ will react with two and half moles of O₂ to produce two moles of CO₂ and one mole of H₂O
Therefore, in the above reaction, when one mole of C₂H₂ is used, two moles of CO₂ will be produced.
A gas cylinder contains exactly 15 moles of oxygen gas (O2). How many molecules of oxygen are in the cylinder
Answer:
Explanation:
The answer is 9.03 × 10²⁴ molecules.
Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance.
Make the proportion.
6.02 × 10²³ molecules per 1 mol
x per 15 mol
6.02 × 10²³ molecules : 1 mol = x : 15 mol
x = 6.02 × 10²³ molecules * 15 mol * 1 mol
x = 90.3 × 10²³ molecules
x = 9.03 × 10 × 10²³ molecules
x = 9.03 × 10²³⁺¹ molecules
x = 9.03 × 10²⁴ molecules
A fertilized egg, or a
, is formed from the fusion of egg and sperm.
How does the Theory of Plate Tectonics explain the location of same fossils at Points A and B?
To calculate the percentage of people who have a particular allele population studies are conducted to collect data.true or false
Determine the pressure inside a television picture tube with a volume of 3.50 L that contains
2.00 X 10^-5 g of nitrogen gas at 22°C.
The pressure inside the television tube containing 2×10¯⁵ g of N₂ at 22 °C is 4.94×10¯⁶ atm
How to determine the mole of fluorine gasMass of N₂ = 2×10¯⁵ gMolar mass of N₂ = 2 × 14 = 28 g/mol Mole of N₂ =?Mole = mass / molar mass
Mole of N₂ = 2×10¯⁵ / 28
Mole of N₂ = 7.14×10¯⁷ mole
How to determine the pressure Volume (V) = 3.5 LTemperature (T) = 22 °C = 22 + 273 = 295 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 7.14×10¯⁷ molePressure (P) = ?The pressure inside the television tube can be obtained by using the ideal gas equation as follow:
PV = nRT
Divide both side by V
P = nRT / V
P = (7.14×10¯⁷ × 0.0821 × 295) / 3.5
P = 4.94×10¯⁶ atm
Learn more about ideal gas equation:
https://brainly.com/question/4147359
In the ideal gas law, the variable n represents
O the ideal gas constant
O number of Joules
O the number of moles
O the number of neutrons
Answer:
C: The number of moles
Explanation:
The ideal gas law is simply the general gas equation for a hypothetical gas and the formula for this ideal gas law is simply;
PV = nRT
Where;
P is pressure
V is volume
n is amount of substance in moles
R is ideal gas constant
T is temperature
Looking at the options, the correct answer is option C.
6/10
For the following reaction:
CO + CuO - Cu + CO2
40 g of carbon oxide is reacted with 90 g of copper oxide.
Which is the limiting reactant?
(Molar mass of CO = 28 g/mol, molar mass of CuO = 80 g/mol)
a: CO2
b: CuO
c: CO
d: Cu
Answer:CuO
Explanation:
The limiting reagent is the reactant which usually determines when the reaction will stop. The limiting reagent depends on the mole ratio, not on the masses of the reactants present. Here the limiting reactant is .The correct option is B.
The reactant which is entirely used up in a reaction is defined as the limiting reagent. The exact quantity of the reactant which is needed to react with another element can be obtained from the reaction stoichiometry.
Here the masses are converted into moles as:
Moles of CO = 40 / 28 = 1.42
Moles of CuO = 90 / 80 = 1.12
Divide the moles obtained with the coefficients to find the limiting reagent. The smaller number is the limiting reagent.
So CuO is the limiting reagent.
Thus the correct option is B.
To know more about limiting reagent, visit;
https://brainly.com/question/26905271
#SPJ1
HELP !!! WITH CHEMISTRY QUESTION
React with metal : property of acidic solutions.
PH > 7 : property of basic solutions.
Feels slippery: property of basic solutions
PH = 7: property of neutral solutions.
Tastes sour : property of acidic solutions.
more H+ ions than : property of acidic
OH- ions solutions.
OH- ions & H+ ions : property of neutral
present in equal solutions
amount
PH< 7 : property of acidic solutions.
conducts : property of acid solutions,
electricity property of basic solutions,
in Water property of acid & base
solutions
Tastes bitter : property of basic
solutions.
Which reaction represents natural nuclear
decay?
A) 4N+ He → 30 H
B) KC1O3 + K+ + C103
C) 335 U → He + 331 Th
D) H+ + OH- + H2O
Answer:
answer is d
i hope this helps you
The reaction that represents natural nuclear decay is 335 U → He + 331 Th, i.e., option C.
What is a nuclear decay reaction?Nuclear reactors continue to operate by enclosing the nuclear fission process.
Even after fission has stopped, radioactive decay of fission products and transuranic elements formed in a reactor produces heat.
Fission reactions can be moderated in order to increase fission or unmoderated in order to breed more fuel.
The reaction that represents natural nuclear decay is
335 U → He + 331 Th.Thus, the correct option is C.
For more details regarding nuclear decay reaction, visit:
https://brainly.com/question/10757669
#SPJ2
What is an example of an ionic bond and why
Answer: An example is NaCl which exist as a ionic compound which has an ionic bond
Explanation: First of all , ionic bonds is the bond formed when a metal and a non metal reacts together.
in sodium chloride it contain sodium and chlorine IONS which are charged particles. the charged particles which are the ions are held together with these force of attraction hence creating such ionic bonds between them
so Na ions and the Cl ions are held together by their ions
Na± and the Cl±
HOPE THIS HELPS IF YOU NEED MORE EXPLANATION FELL FREE TO COMMENT IN THE COMMENT SECTION!!!
All of the following describe the unique role of water except-
Water is polar and cannot dissolve nonpolar compounds such as oil
Water is considered a universal solvent because it can dissolve more substances than any other liquid.
Water is nonpolar and can dissolve nonpolar compounds such as oil
Water has the ability to form hydrogen bonds
Which of the following is a base?
a. AgO
b. HF
c. Ca(OH)2
d. NaCl
Answer:
c. Ca(OH)2
Explanation:
I took the test ;)
In chemistry, bases are substances that react with an acid to yield salt. Calcium hydroxide (Ca(OH)₂) is a base as it is a hydroxide of metal. Thus, option c is correct.
What are bases?Bases are solutes that react with acidic substances to produce water and salt. It comprises substances with hydroxide ion that reacts with hydrogen ion of acid to complete the neutralization reaction.
The carbonates, oxides, and hydroxides of metals make the base that has a pH range of below 7 up to 14. The alkalinity of the substance depends on the ability to release the hydroxide ions in the solution.
Calcium hydroxide (Ca(OH)₂) is a base as it contains OH⁻ ions that are characteristic of bases. On the other hand, NaCl is salt and HF is an acid.
Therefore, Ca(OH)₂ is a base.
Learn more about base here:
https://brainly.com/question/8069088
#SPJ5
!!URGENT URGENT URGENT!! 100 POINTS!!!!!!!!!! If anyone gives me a wrong answer or any other bull you will be reported immediately. Did anyone do the Equilibrium lab 07.06 for Chemistry FLVS? If so I need it URGENTLY my DBA is tomorrow and I will change your writing to mine I'm very good at that I promise just PLEASE HELP ME!!!!!!!!!!
Answer:
is it the one where the objective was : To observe the changes in equilibrium when different components are added or taken away.
If you want to eat foods that contain less additives, what could you do?
A.
Stay away from packaged foods.
B.
Stay away from fresh fruits and vegetables.
Answer: the answer is a
Explanation:
always eat fresh fruits and veggiies.
Equal volumes of solutions with pH = 2 and pH=12 is mixed. Calculate the pH of the resulting solution?
Answer: The pH of resulting solution is 14.
Explanation:
pH of a solution is the negative logarithm of concentration of hydrogen ions.
If two or more solutions are mixed together then pH of the resulting solution is calculated as the sum of pH of all the solutions.
As pH of a given solution is 2 and pH of another solution is 12. Therefore, pH of the resulting solution is calculated as follows.
[tex]pH = pH_{1} + pH_{2}[/tex]
where,
[tex]pH_{1}[/tex] = pH of solution 1
[tex]pH_{2}[/tex] = pH of solution 2
Substitute the values into above formula as follows.
[tex]pH = pH_{1} + pH_{2}\\= 2 + 12\\= 14[/tex]
Thus, we can conclude that the pH of resulting solution is 14.
PLEASEEEEE HELP ME!! Describe in detail, one biome including at least two plants and two animals
indigenous to that biome.
Answer:
An example of 1 biome is the the grassland biome. The 2 plants that are indigenous or native to that biome are buffalo grass and ryegrass. In addition, the 2 animals that are indigenous to the grassland biome are gazelles and prairie dogs.
Explanation:
There are 5 types of biomes: aquatic, grassland, forest, desert and tundra. However, these biomes can be more specific for example, an aquatic biome can include freshwater and marine biomes.
Hope this helps!
Need help with my science
PLESE answer
Answer:
1. food
2.energy
3.digestion
4. system
5. mouth
6.chewed
7.
8. saliva
9swallow
10 oesophagus
11 stomach
12
13 acid
14. small intestine
15. absorbed
16
17large intestine
18 waste
sry there are some i am not sure
If I add 200 mL of water to 600 mL of 16 M HNO3 what will the solution's final molarity be?
12M HNO3
Explanation:
A 600-ml solution of 16M nitric acid contains
16M HNO3 × 0.6 L = 9.6 m HNO3
so by increasing the volume by 200 ml the molarity of the solution becomes
Molarity = (9.6 mol HNO3)/(0.800 L)
= 12M HNO3
What is the mole fraction of ethanol (C2H5OH) in a solution of 47.5 g of ethanol in 850 g of water?
Answer:
0.021
Explanation:
that's the answer because I just did an exam that included this question and then the miss explained to me why this was the answer, but don't worry am 100% sure the answer is 0.021 .
The mole fraction of ethanol in a solution of 47.5 g of ethanol in 850 g of water is 0.021.
How we calculate the mole fraction?Mole fraction of any substance present in solution will be calculted by dividing the moles of sample to the total moles of solution.
Moles will be calculated as:
n = W/M , where
W = given mass
M = molar mass
Moles of ethanol will be calculated as:
n = 47.5g / 46.07g/mol = 1.03 moles
Moles of water will be calculated as:
850g / 18g/mol = 47.18 moles
Total moles of solution = 1.03 + 47.18 = 48.21 moles
Mole fraction of ethanol in water will be calculated as:
mole fraction = 1.03 / 48.21 = 0.021
Hence, mole fraction is 0.021.
To know more about mole fraction, visit the below link:
https://brainly.com/question/25468666
At 289 K, a sample of gas has a volume of 42.0 cm3. What volume does the gas occupy at 342 K? (12.5 Points)
Answer: [tex]49.7\ cm^3[/tex]
Explanation:
Given
At temperature [tex]T_1=289\ K[/tex]
Volume is [tex]V_1=42\ cm^3[/tex]
and the temperature changes to [tex]T_2=342\ K[/tex]
At this temperature volume is [tex]V_2[/tex]
Consider Pressure remains the constant
[tex]\therefore \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\\Rightarrow V_2=V_1\times \dfrac{T_2}{T_1}\\\\\text{Insert values}\\\\\Rightarrow V_2=42\times \dfrac{342}{289}\\\\\Rightarrow V_2=49.7\ cm^3[/tex]
The volume at this temperature is [tex]49.7\ cm^3[/tex]
How many atoms of O are required to form 2 moles of H2SO4?
Answer:
4 oxygen atoms
Explanation:
Answer: One sulphuric acid ( H2SO4 ) molecule has 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.
How far above earth is the international space station
Answer:
248 miles
Explanation:
At an average altitude of 248 miles (400 kilometers) above Earth, the space station is the third brightest object in the sky.
I can't seem to figure out how to set up charts so there's just a screenshot of the question in the file attached :) Thank's for any help!!
Answer:
See Explanation
Explanation:
Volume of base used = (31.79 - 1.6) + (32.12 - 0.98) + (42.87 -13.21)/3 = 30.34 cm3
Volume of acid used = (24.86 - 0.42) + (24.11 - 0.11) + (27.67 -3.42)/3 = 24.23 cm3
For trial 1= number of moles of HBr = 24.44/1000 * 0.3 = 0.0073 moles
For trial 2= number of moles of HBr = 24/1000 * 0.3 = 0.0072 moles
For trial 3= number of moles of HBr = 0.0089 moles
HBr(aq) + KOH(aq) -----> KBr(aq) + H2O(l)
One mole of base is required to neutralize one mole of acid.
From CAVA/CBVB =nA/nB
CAVAnB = CBVBnA
CB = CAVAnB/VBnA
CB = 0.3 * 24.23 * 1/30.34 * 1
CB = 0.24 moldm-3
number of moles of KOH = concentration * volume
number of moles = mass/molar mass
molar mass of KOH = 56 g/mol
mass/56 = 0.24 * 30.34/1000
mass = 0.24 * 30.34/1000 * 56
mass =0.408 g of KOH
A compound formed with potassium and bromine that can detect blood in a stain by reacting with it to form distinctive crystals
Answer:
Potassium Bromide
Explanation:
not sure but i think thats it
I WILL MARK BRAINLY WHOLE SLIDE