Assuming that the reaction is unimolecular on both reactant and product sides such that:
HA + OH- --> A- + H2O
Therefore the amount of A- left is:
mmol HA = 9.00 - 3.00 = 6.00
mmol A- = 3.00
pKa = - log Ka = 5.25
Calculating for pH:
pH = 5.25 + log 3.00/6.00
To calculate the resulting pH of a solution made by mixing 9.00 mmol of HA and 3.00 mmol of a strong base, you need to determine the concentrations of the acid and base, calculate the concentration of the resulting solution, find the pOH using the concentration of the conjugate base, and finally convert the pOH to pH.
Explanation:The pH of the solution can be calculated using the concentrations of the acid and the base. We can assume that the strong base reacts completely with the acid, so the resulting solution will contain only the conjugate base and water. Since we know the concentrations of the acid and base, we can determine the moles of each and calculate the new concentrations of the resulting solution. Finally, we can use the concentration of the conjugate base to find the pOH and then convert it to pH.
Given:
moles of HA = 9.00 mmol
moles of strong base = 3.00 mmol
Total volume of solution = unknown
Let's assume the total volume of the solution is 1 L for easier calculations. The concentration of the acid (HA) is 9.00 mmol / 1 L = 9.00 mM. The concentration of the conjugate base (A-) is also 9.00 mM since the acid and base react in a 1:1 ratio. The pOH of the solution can be calculated using the concentration of the base:
pOH = -log([OH-])
Since the concentration of the base is 9.00 mM, the pOH = -log(0.009) = 2.05
The pH of the solution can be calculated by subtracting the pOH from 14:
pH = 14 - pOH = 14 - 2.05 = 11.95
Therefore, the resulting pH of the solution is approximately 11.95.
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It is thought that long-term memory never can get filled up. the term used to describe the capacity of long-term memory is ________.
Final answer:
The term used to describe the capacity of long-term memory is 'unlimited' or 'limitless' due to its potentially infinite capacity for storing information for extended periods.
Explanation:
The term used to describe the capacity of long-term memory is unlimited or limitless. Long-term memory (LTM) is a type of memory storage that can hold information for extended periods, ranging from days to years. Long-term memory differs from short-term memory in that it possesses a potentially infinite capacity; there is no known limit to what we can remember. Although the ability to retrieve information from LTM can be affected by various factors, such as consolidation and interference, the storage capacity itself is considered vast.
Write a balanced equation for the formation of one mole of nacl(aq) from its elements
A balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].
What are elements?Elements are defined as a substance that is entirely made up of the same kind of atoms, all of which have the same amount of protons in their nuclei. Every element has characteristics. Conductivity, magnetism, melting and boiling points, color, state of matter, and other characteristics are among these. The periodic table of elements is divided into sections, each of which contains groups of elements having related properties.
Balanced equation is defined as a chemical equation where the amount of each element's atoms on each side of the equation is equal and the mass is preserved. The law of conservation of mass stipulates that mass cannot be generated or destroyed, hence a chemical equation must always be in balance.
Thus, a balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].
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What are elements 90-103 called on the periodic table?
The elements 90 to 103 on the periodic table are called the Actinide series. They are part of the 'f-block' and are all radioactive. Some well-known actinides are Uranium and Plutonium.
Explanation:The elements numbered 90 to 103 on the periodic table are known as the Actinide series. These elements, which include Th (Thorium, 90) to Lr (Lawrencium, 103), are part of the 'f-block' and are often shown separately from the main body of the periodic table.
It is important to note that all of the actinides are radioactive, and some are not naturally occurring but synthesized in laboratories. The most well-known of these is probably U (Uranium, 92) and Pu (Plutonium, 94), commonly used in nuclear reactors and weapons.
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How many protons are in Florine whose atomic number is 9 and atomic mass is 19? *
9
10
19
28
Which two ions will MOST LIKELY bond? A. bromine ion and iodine ion B. lithium ion and chlorine ion C. sodium ion and potassium ion D. calcium ion and magnesium ion
Final answer:
Sodium ion and potassium ion are the two ions that are most likely to bond due to their positive charges.
Explanation:
The two ions that are most likely to bond are sodium ion and potassium ion. Both sodium and potassium are alkali metals in Group 1 of the periodic table and have a single electron in their outermost energy level. When they lose this electron, they form positively charged ions (cations). Since sodium has a +1 charge and potassium has a +1 charge, these ions are attracted to each other through electrostatic forces, forming a bond.
Would it make a difference if calcium bromide solution, cabr2, were used rather than sodium bromide solution?
What is the expected outcome of adding a catalyst to a chemical reaction?
a.the reaction will speed up.
b.chemical equilibrium will not be reached.
c.the reaction will slow down.
d.no change will occur?
Part
b.1. eliseo couldn't find the 6 m hcl and so used 6 m hno3 for testing the metals instead. his logic? both are strong acids. explain how the results of the experiment would have been different.
An atom of aluminum with a mass number of 24 and an atomic number of 13 has a total of
An atom of aluminum with a mass number of 26 and an atomic number of 13 has a total of 13 protons and electrons and 13 neutrons.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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To find the number of neutrons in an atom, subtract its _____.
Explanation:
It is known that an atom consists of protons, neutrons and electrons. Both protons and neutrons are located inside the nucleus of an atom whereas electrons revolve around the nucleus.
Atomic number is the total number of protons present in an atom. On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.
That is, Atomic mass = no. of protons + no. of neutrons
no. of neutrons = atomic mass - no. of protons
Therefore, we can conclude that to find the number of neutrons in an atom, subtract its number of protons from atomic mass.
In which orbital does an electron in a copper atom experience the greatest effective nuclear charge?
Steel is an alloy of one or more elements combined with which metal
What process uses atomic particles of carbon and uranium to determine exact age?
Answer:
Radioactive dating
Explanation:
Which of the following statements best describes the Aufbau principle?
Which noble gas has the greatest atomic number?
Rn
Ar
Xe
Kr
The two jovian planets that contain the highest proportions of hydrogen compounds are ___________.
Jupiter and Saturn contain the highest proportions of hydrogen compounds. They are primarily composed of hydrogen and helium with hydrogen being the dominant element, and their atmospheres house several hydrogen-based gases and complex hydrocarbons.
Explanation:The two Jovian planets that contain the highest proportions of hydrogen compounds are Jupiter and Saturn. These planets, known as the gas giants of our solar system, consist primarily of hydrogen and helium, with hydrogen being the more abundant element. Jupiter and Saturn's high gravitational force has compressed the gases in their interior until the hydrogen becomes a liquid, earning them the often misleading label of 'gas planets'.
However, the bulk of both planets consists of compressed, liquefied hydrogen, so they could more accurately be referred to as 'liquid planets'. This hydrogen-rich composition has influenced the chemistry of the outer solar system. Subsequently, the atmospheres of these planets are heavily populated with hydrogen-based gases such as methane (CH4) and ammonia (NH3), or more complex hydrocarbons.
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Which element in Group 1 has the greatest tendency to lose an electron?
The electron configuration of the element chlorine ends in.
A. 3s2.
B. 3p6.
C. 3s23p5.
D. 3s23p7.
What is the relationship between the number of protons and the number of electrons in an atom?
What is a reasonable estimate for the radius of an atom?
Answer is: 1 × 10⁻¹⁰ meter or 0.0000000001 meter.
The atomic radius is a measure of the size of the atom.
It is distance from the center of the nucleus of atom to the boundary of electron cloud.
The radius of atoms is between 30 and 300 pm (10⁻¹² m) or between 0.3 and 3 angstroms (10⁻¹⁰ m).
The radius generally decrease along each period of the Periodic table.
Round the following answer correctly. 5.40m x 3.21m x 1.871m = 32.431914 m^3
The raw result of 32.431914 m³ should be rounded to 3 significant figures. Therefore, it becomes 32.4 m³.
Identify Significant Figures:
5.40 m has 3 significant figures.3.21 m has 3 significant figures.1.871 m has 4 significant figures.Calculate the Raw Product:
The raw product of these measurements is 5.40 m x 3.21 m x 1.871 m = 32.431914 m³ (as given).
Determine Significant Figures for Final Answer:
When multiplying, the result should have the same number of significant figures as the measurement with the fewest significant figures. In this case, that is 3 significant figures (from 5.40 m and 3.21 m).
13. What is the difference between a solution and a heterogeneous mixture? Give an example of
each.
(4 points)
Answer:
The macroscopic appearance is different.
Explanation:
The two (solution) and heterogeneous mixture are actually mixtures. These are made up of one of two pure substances in gaseous and liquid phases.
However, the difference lies in the macroscopic level of the particles.
A heterogeneous mixture is made of different substances. For example, when powdered milk is added to water, the mixture is a white substance, or colloidal mixture. The mixture is a heterogeneous in the sense that is all liquid; however, the mixture is not the same color as water. Thus, there is not complete dissolution.
A solution is the same throughout. An example is dissolving sugar into water. The solution is colorless throughout. The difference is that the sugar and water have formed a solution whose properties are not visible to the naked eye.
Living things transform kinetic energy into potential chemical energy in the
Electrons have almost no mass. True False
TRUE is the perfect answer
What is the electronic configuration of a selenium atom (se)?
Answer:
[tex]1s^{2}2s^{2}2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]
Explanation:
For this exercise is necessary to know the atomic number of Se, which is 34 and indicate the numbers of electrons that has this atom.
For the electronic configuration you just need to follow the direction of the arrow indicated in the attached image, which shows the distribution of the electrons in the atomic orbitals, until complete the 34 electrons that has the selenium atom. The super index indicates the number of electrons in a specific atomic orbital. Then the electron configuration of selenium atom is:
[tex]1s^{2}2s^{2}2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]
Which property of isotopes makes them suitable for determining the dates of ancient artifacts? atomic number of the isotope rate of decay of the isotope radiation from the isotope stable nature of the isotope
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What is a possible pH of acid rain?
7.0
6.9
4.3
10.5
the answer is 4.3.....
When balancing a chemical equation, the number of h atoms in 2 ch4 is eight?
Which of the following elements is a gas at room temperature?
fluorine (F)
sulfur (S)
mercury (Hg)
iodine (I)
Electrons move about the nucleus of an atom in regions called what?