The [H₃0⁺] of the solution : 1.778 x 10⁻¹² M
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
pH of solution = 11.75
the [H₃0⁺] of the solution :
[tex]\tt pH=-log[H_3O^+]\\\\11.75=-log[H_3O^+]\\\\(H_3O^+]=10^{-11.75}=1.778\times 10^{-12}[/tex]
What type of particles would be in a sample of carbon dioxide?
Nuetrons, Electrons, and Protons.
You want to calculate the average atomic mass of a sample of Nickle. There are 32 atoms of Nickle-60 and 89 atoms of Nickle-57.
What is the percent distribution of Nickle-60?
What is the percent distribution of Nickle-57?
What is the average atomic mass of the sample? Round to the correct number of decimals and include units?
Answer:
Average atomic mass = 57.79 amu
Percent contribution of Ni-60 = 26.45%
Percent contribution of Ni-5 = 73.55%
Explanation:
Given data:
Number of atoms of Ni-60 = 32
Number of atoms of Ni-57 = 89
Percent distribution of both isotopes = ?
Average atomic mass of sample = ?
Solution:
Percent contribution:
Total number of atoms = Ni-60 + Ni-57
Total number of atoms = 32 +89 = 121
Percent contribution of Ni-60 = 32/121×100
= 26.45%
Percent contribution of Ni-57 = 89/121×100
= 73.55%
Average atomic mass:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (26.45×60)+(73.55×57) /100
Average atomic mass = 1587 + 4192.35 / 100
Average atomic mass = 5779.35 / 100
Average atomic mass = 57.79 amu.
A student makes observations of a tree in a nearby forest. Which of the following observations of the
tree's characteristics would be useful in determining its identity with a dichotomous key?
A
It contains the nests of several birds.
B
Its leaves are long and narrow.
с
Its branches were recently cut.
D
It provides shade for ground brush.
The observations of the tree's characteristics would be useful in determining its identity with a dichotomous key is its leaves are long and narrow. The correct option is B.
What is an observation?Observation is a process of recognizing and recording an event or fact that frequently involves measuring it with tools. Recognizing and recording an event, or fact frequently involves measuring with tools. Field notes are written observations made while participating in field observations or immediately afterward.
They are crucial for understanding phenomena that have been seen in the field. Field notes frequently take the form of scratch notes, diaries, and notebooks. In the scientific field, observation is a crucial step.
Therefore, the correct option is B. Its leaves are long and narrow.
To learn more about observation, refer to the link:
https://brainly.com/question/13196625
#SPJ6
What is electron affinity?
Answer:
The ability of an atom to accept an electron.
Explanation:
Electron affinity is measured by observing the energy change of a substance when an electron is added to it in its neutral gas form. For example, elements that are on the far right of the periodic table (excluding noble gases) are more likely to accept electrons rather than give them up. This is why Fluorine has the highest electron affinity of all atoms on the periodic table.
Surgical instruments may be sterilized by heating at 170°C for 1.5 hours. Which of the following shows the correct conversion of 170°C to kelvins? *
A. -103 K
B. 73 K
C. 443 K
D. 621 K
The declaration that shows the correct conversion of 170°C to kelvins is 443 K. Thus, the correct option for this question is C.
How to convert degree Celcius into kelvin?The conversion of Celcius to kelvin required the utilization of the formula which is as follows:
Kelvin = Degree Celcius + 273.15.Sterilization of surgical instruments at 170°C for 1.5 hours helps in the process of elimination of contaminated or unwanted impurities from the surface of the instruments in order to conduct error-free experiments.
According to the question,
The temperature of sterilization is = 170°C.
Now, it is required to convert 170°C into kelvin.
∴ Kelvin = 170°C + 273.15 = 443.15 ≅ 443 K.
Therefore, the declaration that shows the correct conversion of 170°C to kelvins is 443 K. Thus, the correct option for this question is C.
To learn more about Sterilization, refer to the link:
https://brainly.com/question/10432738
#SPJ2
what is density? chemistry
Answer: Density means the compactness of an object
I hope this helps, and Happy Holidays! :)
The volume of a sample of gas measured at 35 C and 1.00 atm pressure is 2.00 L. What must the final temperature be in order for the gas to have a final volume of 3.00 L at 1.00 atm pressure?
Answer:
the final temperature is 465.2k
A molecule has a molar mass of 22.45 g/mol. What is the mass of 4.12*10^24 of the molecules?
Answer:
153.56g
Explanation:
Number of moles = mass/molar mass
To get the number of moles of the molecule, we divide the number of molecules contained by Avagadro's number, which is 6.02 × 10^23 molecules.
moles = 4.12 × 10^24 ÷ 6.02 × 10^23
number of moles = 0.684 × 10^(24-23)
number of moles = 0.684 × 10^(1)
number of moles = 6.84mol
If the molar mass of the molecule is 22.45 g/mol, the mass of the molecule can be calculated thus:
mass = moles × molar mass (MM)
mass = 6.84 × 22.45
mass = 153.558
mass = 153.56g
Light waves travel at different speeds through different medium. Which list shows the correct order of increasing speed of light waves in medium, from slowest to fastest?
A solids → liquids → gases
B gases → liquids → solids
C gases → solids → liquids
D liquids → solids → gases
Answer:
I think the correct answer is B
The speed of the light is different in different medium. The speed of the light is highest in vacuum. The increasing speed of light waves in medium, from slowest to fastest is gases → liquids → solids. The correct option is B.
What is light wave?A light wave is a mechanical wave. A mechanical wave is defined as the wave which is an oscillation of matter and it is responsible for the transfer of energy through a medium. There are two types of mechanical wave, they are longitudinal waves and transverse waves.
The light wave is a transverse wave. The movement of the particles is at right angles or perpendicular to the motion of the energy. The speed of the light depends on the density of the medium. The more density, less will be the speed of the wave.
The gaseous state has less intermolecular force of attraction as compared to the liquids and solids. So in gaseous state light has maximum speed.
Thus the correct option is B.
To know more about light, visit;
https://brainly.com/question/30749500
#SPJ3
its snowing RIGHT NOW yay santa!!!!
Answer:
Yay
Explanation:
could i have a heart and branliest plss
Guys I need help with this ASAP! An atom of Iron has a mass of 56 atomic mass units. What is the number of protons and the number of neutrons in the nucleus?
Answer:
protons = 26; neutrons = 30
Explanation:
protons = atomic number; neutrons = atomic mass – # of protons.
The red outlined elements have what major characteristics in common?
1 point
Metals, Nonmetals, and Metalloids
One major characteristic they have in common is they are metals.
GIVE 6 GIVING AWAY 100 IN A ROW HOPE YALL ENJOY MAKE SURE TO TELL PEOPLE ABOUT MY GOOD WORK TY
Answer:
YOURE AMAZING THANK YOU THANK YOU THANK YOU
Explanation:
4. Look at the equation below and determine what fitsI in the empty box.
14 C --> 4 N+
?
re
c. en TH
What belongs in the empty box?
A.
В.
e
D.
Answer:
Beta particles
Explanation:
A beta emission is said to occur when a neutron is converted into a proton. When a beta emission takes place, the daughter nucleus increases it's atomic number by 1. A neutrino is also produced.
Since the mass number remain the same but the daughter nucleus has it's atomic number increased by 1, then the particle is a beta particle.
WILL BE MARKED BRAINLIEST IF U ANSWER CORRECT
PLUS 30 PT
Why does DNA dissolve in water?
Why is salt added to solution of DNA and water?
How does ethanol help the precipitate form?
After a pellet is formed, is the DNA in the pellet or the supernate?
Explanation:
Because of this, DNA and RNA can easily dissolve in water. ... Adding ethanol helps the Na+ and PO3- ions come together, because ions travel easier in ethanol than water. The supernate is removed and new ethanol is added in the second washing. This removes any residual salt that remained on the pelleted DNA.
Answer:
DNA is polar due to its highly charged phosphate backbone. Its polarity makes it water-soluble (water is polar) according to the principle "like dissolves like". ... This fact makes water a very good solvent for charged compounds like salts.
Your DNA's sugar phosphate backbone is charged. By adding salt, we help neutralize the DNA charge and make the molecule less hydrophilic, meaning it becomes less soluble in water. The salt also helps to remove proteins that are bound to the DNA and to keep the proteins dissolved in the water.
It is well known that Ethanol has a lower dielectric constant than water, making it to promote ionic bond formations between the Na+ (from the salt) and the PO3- (from the DNA backbone), further, causing the DNA to precipitate.
Explanation:
Ideally DNA needs to be precipitated with pellet and should not remain in supernatant. DNA is acidic in nature and therefore, needs optimum salt concentration in the buffer to be pelleted from a solution. At very low salt concentration or without salt DNA would remain in supernatant.
What is the electron configuration for N (nitrogen)?
A. 1s22s23s23p1
B. 1s21p5
C. 1s22s22p3
D. 1s22s22p23s1
Explanation:
₇N = 1s² 2s² 2p³
Group = 15period = 2atomic mass = 14Hydride of Nitrogen = Ammoniavalency = 3Therefore,
Option C is correct ✔
someone please help me answer this i’m struggling and i will give branliest
Answer:
bottom right corner with arrows going up
Based on the activity series provided, which reactants will form products? F > Cl > Br > I CuI2 + Br2 Right arrow. Cl2 + AlF3 Right arrow. Br2 + NaCl Right arrow. CuF2 + I2 Right arrow.
Answer: Cul2 + Br2 ->
Explanation:
Answer:
i believe the answer is a
Explanation:
When chemists work with solid materials, we simply weigh out amounts of solid reagents and calculate mole amounts when thinking about stoichiometry. However, when we dissolve a solid (also known as a solute) in a solvent to form a solution, the solute becomes evenly distributed throughout the solution and we need to know how many moles of solute are present in a particular volume of solution.a) A solution is created by dissolving 13.5 grams of ammonium chloride in enough water to make 315 mL of solution. How many moles of ammonium chloride are present in the resulting solution?b) What is the molarity of the solution described above?c) To carry out a particular reaction, you determine that you need 0.0500 moles of ammonium chloride. What volume (mL) of the solution described above will you need to complete the reaction without any leftover NH4Cl?
Answer:
See the answers below
Explanation:
13.5 g of NH4Cl was dissolved in 315 mL of water.
Moles of NH4Cl present in the solution = mass/molar mass
Molar mass of NH4Cl = 54.49 g/mol
a) Moles of NH4Cl = 13.5/54.49
= 0.25 mole
b) Molarity of solution = moles of solute/volume of solution
moles of NH4Cl = 0.25
volume of solution = 315 mL = 0.315 L
molarity = 0.25/0.315
= 0.79 M
c) moles required = 0.0500 mole
molarity = 0.79 M
molarity = moles x volume
volume = molarity/moles
= 0.79/0.0500
= 15.8 L = 15,800 mL
what form of energy causes an ice cube to melt
A.mechanial
B.magnetic
C.sound
B.thermal
Answer:
Thermal
Explanation:
When something heats up its atoms become further apart making it melt when something heats up or gets heat or loses heat that's thermal energy
What's the electron configuration of an N-3 ion?
Question 17 options:
A)
[Ne]
B)
[Ar]
C)
[H]
D)
[He]
Answer:
A. since Nitrogen has 7 electrons and when it gains 3 electrons it will have 10 electrons. using short hand rule it is [Ne]
What do you have to do to break a molecule?
Answer:
Heat the molecule
Explanation:
Since most bonds require energy to form, they also give off energy when they are broken. But before most bonds break, the molecule has to be heated. Then the atoms start to move, and when they move too much, the bond breaks. Molecules that require less energy to break than they give off when broken are called fuels.
What is the correct lewis electron-dot structure for the compound magnesium fluoride?
Answer:
3.
Explanation:
The correct electron dot structure that represents the Magnesium fluoride molecule has been C.
Lewis electron dot structure has been used for the representation of the valence electrons and the bonded electrons in the compound. The electrons have been represented with the dot, thereby the structure has been termed to be the dot structure.
Magnesium has been consisted of 12 electrons with 2 valence electrons, while F has been consisted of 1 valence electron.
The bond between the Mg and F results by the attraction of the Mg electron by Fluorine that has been used for the octet completion, thereby a negative charge has been added to the F atom, while there have been 2 positive charges to the Mg atom.
Thus, the correct electron dot structure that represents the Magnesium fluoride molecule has been C.
For more information about the electron lewis dot structure, refer to the link:
https://brainly.com/question/6079983
Decide which element probably has a boiling point most and least similar to the boiling point of aluminum.
Comparing boiling point:
gallium rubidium magnesium oxygen
most similar to aluminum
least similar to aluminum
Answer:
The boiling point of gallium would be most similar to aluminum, and the boiling point of oxygen would be least similar to aluminum.
Explanation:
The atomic number of aluminum is 13, in the periodic table, magnesium lies in a similar period as Aluminum and Gallium is also present in a similar group. Thus, it can be expected that both magnesium and gallium exhibits similar boiling points with aluminum. However, gallium is a poor non-metal just like aluminum, while magnesium is a metal. Thus, it can be said that the boiling point of aluminum is more similar to gallium.
Now of the given elements, oxygen is a gas, thus, the boiling point of oxygen would be least similar to aluminum.
A compound with a formula mass of 45.08 g/mol is found to be 85.64% Carbon and the remainder Hydrogen. Find the molecular formula:
Percent yield is very important in terms of money. The higher the percent yield, the more of a product you can make. If you are working for a drug company and your theoretical yield is 120 kg, but you actually made 105 kg, what is your percent yield?
A. 8.75%
B. 114%
C. 87.50%
D. 15.00%
Answer:
87.5 %
Explanation:
Step 1: Given data
Theoretical yield: 120 kgReal yield: 105 kgStep 2: Calculate the percent yield
When working with chemical reactions, we can determine the efficience in obtaining a product measuring the percent yield. The theoretical yield is the maximum amount of product that we could obtain according to the stoichiometry, whereas the real yield is the amount of product that we actually obtain when we carry out the process. We can calculate the percent yield usign the following expression.
%yield = real yield / theoretical yield × 100%
%yield = 105 kg / 120 kg × 100%
%yield = 87.5 %
Electron transfer between redox centers in proteins is controlled by quantum tunneling. We can model the region between two redox centers as an energy barrier which the electron must cross. If the distance between the redox centers is 0.681 nm and the energy of the electron is 0.5540.554eV lower than the height of the barrier, what is the probability that the electron will successfully cross to the next redox center
Answer:
5.61 e⁻³
Explanation:
Given that:
The barrier length = 0.681 nm = 6.81 × 10⁻¹⁰
The difference between the height of the barrier & the energy of the electron is;
[tex]V - E = 0.554 \ eV (1.6 \times 10^{-19} )[/tex]
= 8.864 × 10⁻²⁰ V
where;
m = 9.1 × 10⁻³¹ kg
The probability[tex]P = e^{-2 \ kd}[/tex]
[tex]k = 2 \pi \sqrt{\dfrac{2m (V-E)}{h^2} }[/tex]
[tex]k = 2 \pi \times \dfrac{\sqrt{2 \times 9.1 \times 10^{-31} \times 8.864 \times 10^{-20}}}{6.63 \times 10^{-34}}[/tex]
k = 3.806 × 10⁹
[tex]P = e^{-2 \ kd}[/tex]
[tex]P = e^{2 \times 3.806 \times 10^9 \times 6.81 \times 10^{-10}}[/tex]
P = 0.005606
P = 5.61 × 10⁻³
P = 5.61 e⁻³
Can someone answer 4 for me please?
Which is the correctly balanced equation?
A) Cl2 + 2NaI = 2NaCl + I2
B) NaOH +HCl = NaCl + H2O2
C) 2HgO = Hg + O2
D) 2Li + H2O = 2LiOH + H2
PLS HURRY, TAKING TEST, NEED HELP NOW
Answer:
A) Cl2 + 2NaI = 2NaCl + I2
The compound iron(III) nitrate is a strong electrolyte. Write the transformation that occurs when solid iron(III) nitrate dissolves in water. Be sure to specify states such as (aq) or (s).
Answer:
Fe(NO₃)₃ (s) → Fe³⁺ (aq) + 3 NO₃⁻ (aq)
Explanation:
The iron (III) nitrate is a salt, that can be 100 % dissociated in water.
Fe(NO₃)₃ (s) ⇒ Fe³⁺ (aq) + 3 NO₃⁻ (aq)
It is not considered 100% neutral, because Fe³⁺ can release protons to water, when it is hidrated. It works similar as the Al ³⁺.
NO₃⁻ (aq) + H₂O (l) ← OH⁻(aq) + HNO₃(aq)
This reaction can not occur. Nitrate is a weak base, derivated from a strong acid, so it can't make hydrolysis.
Salt can be a little acid, because Fe³⁺ react to water to give protons, and a determined complex
Fe³⁺ (aq) + H₂O(l) ⇄ Fe(OH)²⁺ (aq) + H⁺(aq)