Solutions b.) 0.10 M HC₃H₅O₃ and c.) 0.10 M HC₃H₅O₃ and 0.10 M NaC₃H₅O₃ are buffers.
A buffer is a solution that resists changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid.
Solution b.) 0.10 M HC₃H₅O₃ contains acetic acid (CH₃COOH), which is a weak acid. By itself, this solution can act as a buffer since it can partially dissociate to release H⁺ ions and maintain pH stability.
Solution c.) 0.10 M HC₃H₅O₃ and 0.10 M NaC₃H₅O₃ contains a mixture of acetic acid (weak acid) and sodium acetate (CH₃COONa, conjugate base). The presence of both the weak acid and its conjugate base enables the solution to effectively resist changes in pH, making it a buffer solution.
Solution a.) 0.10 M HCl and 0.10 M NaCl does not contain a weak acid and its conjugate base. HCl is a strong acid, fully ionizes in water, and does not have the ability to act as a buffer. Therefore, solution a is not a buffer.
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What is the empirical formula for C2H6?
ОСН
O CH3
O C2H4
O C6H18
Answer:
Option 2 is correct = CH₃
Explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number .
For example:
C₂H₆
The simplest small whole number for C₂ is one and H₆ is 3. Thus empirical formula is CH₃.
Other options are incorrect.
Some more examples:
S₂O₂
The simples positive number for S and O is 1, thus its empirical formula is SO. The 1 is usually not written with symbol in formula.
Within each energy level there are different sublevels that are created. Those electrons that have the lowest
amount of energy follow paths that are spherical in shape. Which sublevel is associated with this shape?
A)
d.
B)
f
C)
р
D)
S
4
Evidence is only useful to a scientific argument when it's:
A
Based on observation
B.
Measured in numbers
С
Relevant to the claim
D
Collected by a scientist
Answer:
relevant to the claim i think
A very disorganized scientist has lost track of some data from a recent experiment and can no longer determine what element she was working with. Now, she refers to it as element X. She knows the element has a smaller atomic radius than strontium, a larger ionization energy than phosphorus, and a smaller electronegativity than chlorine. What is the likely identity of element X?
Answer :
The element X which ha a smaller atomic radius than strontium , a larger ionization energy than phosphorous , and a smaller elctronegativity than chlorine is Nitrogen
Explanation:
Here are some properties of Nitrogen-
Atomic number of Nitrogen is 7 Atomic mass of nitrogen is 14.0067 g.mol -1Nitrogen is a popular non-metal gas that is usually colourless, odourless, tasteless and often diatomic. In its outer shell, it has five electrons, but in most compounds, it is trivalent. Applications- In the manufacture of ammonia, the greatest single commercial use of nitrogen is as a part, subsequently used as fertilizer and to produce nitric acid. Liquid nitrogen (often referred to as LN2) is used as a refrigerant for the freezing and transport of food items, for the protection of bodies and for the reproduction of food products. Nitrogen is a constituent in all living tissues and comprises 78 percent of the Earth 's atmosphere. Nitrogen, since it is a component of DNA and, as such, is part of the genetic code, is an integral element of life.Hence , the X element is NITROGEN.
Which of the following has the lowest boiling point?
O HF
NaCl
O MgCl2
O CH4
Answer:
sheshhhhhhhh naci
Explanation:
The baseball player hits a ball of 0.145 kg about 38.8 m to second base with a force of 40 N. What is the acceleration?
Answer:
275.9 m/s2
Explanation:
a = 40N ÷ 0.145 kg
Answer:
275.9 m/s2
Explanation:
275.9 m/s2
PLEASE HELP!! It’s the last day to get the assignment in!!
What are some signs
scientists look for to
indicate that a chemical
change may have
occurred?
Answer:
Explanation:
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change. Or Light is given off, a permanent color change occurs, gas is given off, heat is given off, and a precipitate is formed
how many atoms of nitrogen (N) are in this compound?
3 Pb(NO3)4
Answer:
12 nitrogen atoms
Explanation:
This is essentially 3 molecules of Lead (IV) Nitrate, And since there were originally 4 nitrogen atoms in this single ionic compound, there are now 12 total
What makes an isotope radioactive?
PLease help quick
Answer:
Many elements have one or more isotopes that are radioactive. These isotopes are called radioisotopes. Their nuclei are unstable, so they break down, or decay, and emit radiation. ... A: The nucleus may be unstable because it has too many protons or an unstable ratio of protons to neutrons.
Layers: Earth as ___: Sun
A) Milky Way galaxy
B) zero gravity
C) solid surface
D) gas
Answer:
C solid surface
Explanation:
Answer:
c
Explanation:
thrust i THINK ok well bye
Convert 3.02 x 1024 molecules of carbon (C) to moles.
Answer:
5.02 mol C
Explanation:
Step 1: Define
Avagadro's Number - 6.02 × 10²³ atoms, molecules, formula units, etc.
Step 2: Use Dimensional Analysis
[tex]3.02(10)^{24} \hspace{3} molecules \hspace{3} C(\frac{1 \hspace{3} mol \hspace{3} C}{6.02(10)^{23} \hspace{3} molecules \hspace{3} C} )[/tex] = 5.01661 mol C
Step 3: Simplify
We have 3 sig figs.
5.01661 mol C ≈ 5.02 mol C
Which of earth’s layers is responsible for creating the earth’s magnetic field
Answer:
Explanation:
The core makes the Magnetic field around the Earth:)
HURRY
(send a picture if you can)
Explanation:
The first is Oxygen (O) between N and F
After F, the next is Neon (Ne)
Before Mg, it is Sodium (Na)
Between Al and P, it is Silicon (Si)
Potassium (K) is the last one, between S and Ar
Italian salad dressing ....
1)element
2)compound
3)solution
4)mechanical mixture
Answer:
compound
Explanation:
Once you mix it you cant take it back apart
Carbon-14 has a half-life of approximately 5700 years. How much of a 1000g sample will be left undecayed and still radioactive after 11,400 years?
A: 1000g
B: 500g
C: 250g
D: 125g
Answer:
option C is correct (250 g)
Explanation:
Given data:
Half life of carbon-14 = 5700 years
Total amount of sample = 1000 g
Sample left after 11,400 years = ?
Solution:
First of all we will calculate the number of half lives passes during 11,400 years.
Number of half lives = time elapsed/ half life
Number of half lives = 11,400 years/5700 years
Number of half lives = 2
Now we will calculate the amount left.
At time zero = 1000 g
At first half life = 1000 g/2 = 500 g
At second half life = 500 g/2 = 250 g
Thus, option C is correct.
How many molecules of NH3 are present in 107.1 g?
Answer:
37.94 × 10²³ molecules of ammonia.
Explanation:
Given data:
Mass of ammonia = 107.1 g
Number of molecules = ?
Solution:
First of all we will calculate the number of moles of ammonia.
Number of moles = mass/molar molar mass
Number of moles = 107.1 g/ 17 g/mol
Number of moles = 6.3 mol
Now we will use the Avogadro number to calculate the number of molecules.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
6.3 mol × 6.022 × 10²³ molecules / 1mol
37.94 × 10²³ molecules of ammonia.
what happens when balloon filled with CO2 is released in air
Which particle has a negative charge?
A. A beta particle
B.
An aluminum ion
C.
An alpha particle
D.
A lithium ion
Answer: A
Explanation: Beta particles have a charge of -1
What is the electron configuration for Selenium? *
1s²2s²2p⁶3s²3d¹⁰3p⁶4s³4p³
2s³2p⁶3s³3p⁶4s³3d¹⁰4p⁶
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴
1s²2s³2p⁶3s²3p⁶3d¹⁰4s²4p⁴
Explanation:
The electronic configuration of Selenium(Se) is 1s22s22p63s23p63d104s24p4 we remove electron .the electron configuration is1s22s22p63s23p63d104s24p4
the correct anwser is C
The electron configuration for Selenium is: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴.
Therefore, option c is correct.
What is electronic configuration ?The electronic configuration of an element is the filling of electron from lower energy level to the higher energy level. This is according to the Aufbau's principle.
Selenium has 34 electrons. The electronic configuration of Selenium can be determined by filling the electrons in increasing order of energy levels and sub-levels.
The electronic configuration of Selenium can be written as:
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴
Here, 4s is more energetic than 3d and thus occupies first.
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At what point is the electric field around the positive charge the weakest?
Answer:
A
Explanation:
as u move away from static charge the electric field intensity decreses
If a mass of a cube were 48.0g and its volume 24.0 cm3 what would its density be
Answer:
The answer is 2 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 48 g
volume = 24 cm³
We have
[tex]density = \frac{48}{24} \\ [/tex]
We have the final answer as
2 g/cm³Hope this helps you
Work is the transfer of energy through motion. Force and distance are in the same direction
A. True
B. False
Answer:
True
Explanation:
what does mechanical energy mean?
Answer:
Mechanical energy is basically the energy of movement
For example, if I am running, im using Mechanical energy
What is true of all matter? *
A. It has mass
B. It can be seen
C. It exists only as a solid
D. It maintains its shape and size
Answer:
A
Explanation:
what is the molecular formula of sodium sulphate
chemical and physical properties of calcite
Answer:
Chemical Classification Carbonate
Explanation:
What is the percent composition of sulfur in SO2?
(32.1 g + 16.0 g + 16.0 g)
O A.
X 100%
32.1 g
32.1 g
B.
X 100%
(16.0 g + 16.0 g)
(32.1 g)(6.02 x 1023)
100 g
32.1 g
D.
X 100%
(32.1 g + 16.0 g + 16.0 g)
Answer:
Explanation:
5.0.4 percent
Answer:
its D y'all
Explanation:
When using evaporation/boiling, it is
important to remember that the only
thing retained is the
a) solid
b) gas
c) liquid
Which structure is located between the auricle and the eardrum? O stirrup O ear canal O auditory nerve Ocochlea
Answer:
The structure that is located between the auricle and the eardrum is the ear canal.
Explanation:
The ear canal, or external ear canal, is a a tubular hole about 30 mm long that runs from the auricle to the eardrum, forming part of the external ear.
Its function is to conduct sound, in the form of vibrations, from the outside to the eardrum. It also has the function of producing a viscous secretion called cerumen, capable of trapping dust particles and small foreign bodies.
Other options are not correct because:
Stirrup is located in the middle ear, along with the anvil and hammer. Cochlea is in the inner ear and continues with the auditory nerve.Answer:
ear canal
Explanation:
9. In what year does the Russian chemist Dimitri Mendeleev started the
development of the periodic table, arranging chemical elements by atomic
mass?
A. 1866
B. 1867
C. 1868
D. 1869
10. How many elements are there in the formula: Ca(OH).
B. 3
C. 7
D. 8
Answer:
a
9. In what year does the Russian chemist Dimitri Mendeleev started the
development of the periodic table, arranging chemical elements by atomic
mass?
A. 1866
B. 1867
C. 1868
D. 1869✓
10, this explanation maybe help you
Answer:
5
Explanation:
Ca is 1 since there is no subscript and O and H each have 2 because the subscript 2 is outside the parenthesis.
i. e. 1 Ca + 2 O + 2 H = 5 atoms
Hope this helps
