The hydronium ion concentration [H₃O⁺]=7.826 x 10⁻⁶
Further explanationIn general, the weak acid ionization reaction
HA (aq) ---> H⁺ (aq) + A⁻ (aq)
Ka's value
[tex]\large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}}[/tex]
Reaction
HCN(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CN⁻ (aq)
0.125
x x x
0.125-x x x
[tex]\tt Ka=\dfrac{[H_3O^+][CN^-]}{[HCN^-]}[/tex]
[tex]\tt 4.9\times 10^{-10}=\dfrac{x^2}{0.125-x}\approx \dfrac{x^2}{0.125}\\\\x^2=6.125\times 10^{-11}\\\\x=7.826\times 10^{-6}[/tex]
What term describes the ability of something to float on water
A) density
B) buoyancy
C) magnetism
D) solubility
Answer: (B) Buoyancy
Explanation: Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy
Answer:
[tex]\boxed {\tt B. \ Buoyancy}[/tex]
Explanation:
Let's define each answer choice.
A. Density
The amount of mass in a certain spaceB. Buoyancy
The tendency of an object to float on a fluid/waterC. Magnetism
The ability of objects to product attracting or repulsing fieldsD. Solubility
The ability to dissolveThe definition that matches "the ability for something to float on water" is buoyancy. Therefore, the correct answer is B. Buoyancy
Which types of particles are charged and located within the nucleus of an atom?
a. protons and electrons
b. neutrons
c. electrons
d. protons
The size or strength of something, like a force.
Velocity
Acceleration
Magnitude
Direction
The size or strength of something like a force is acceleration. Thus, option b is correct.
What is force?
In general language we can say that push or pull is called force.
According,to newton second law of motion force is rate change of momentum it means
F= d/dt×(mxv)
Where m is mass and v is velocity
But in general case mass is constant.
So ,Force
F= mxd/dt×(v)
Since we know that rate change of velocity is acceleration.
Then we can say that
F= mass x acceleration
S.I unit of force is Newton
1 Newton = 1kg×m/sec^2.
Force and acceleration is a physical quantity which have both i.e magnitude and direct it means both are vector quantity. According,to newton second law of motion force is rate change of momentum it means
F= d/dt×(mxv)
Therefore, the size or strength of something like a force is acceleration. Thus, option b is correct.
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Order the steps required to extract a dichloromethane solution with aqueous hydrochloric acid.
Transfer the "Organic Layer" back to the empty separatory funnel.
b. Add an equivalent volume of aqueous acid to the dichloromethane layer in the separatory funnel.
h. Label this beaker "Aqueous Layer".
Remove the cap.
Label the beaker "Organic Layer".
Make sure the stopcock is closed.
Repeat all steps. Drain the bottom layer into a labeled beaker.
C. Cap the separatory funnel with a glass or Teflon stopper.
e. Place the separatory funnel back in the Iron ring.
Remove the funnel from the iron ring and shake vigorously to mix the layers, periodically venting to release pressure. Drain the remaining liquid into a labeled beaker. Suspend a separatory funnel using an iron ring and ring stand. g.
Allow the layers to physically separate in the funnel. Transfer the organic (dichloromethane) layer to the funnel.
The formatting of the question is a bit scrambled: I'm not sure if there are separate steps that have been unintentionally consolidated into a seemingly discrete step, nor am I sure which letters actually correspond with which step(s). So, for clarity's sake, I treated every sentence as its own step and arranged all of them accordingly. Hopefully, you can then reorganize them according to the labeled steps as you have been provided.
Suspend a separatory funnel using an iron ring and ring stand. Make sure the stopcock is closed. Transfer the organic (dichloromethane) layer to the funnel. Add an equivalent volume of aqueous acid to the dichloromethane layer in the separatory funnel. Cap the separatory funnel with a glass or Teflon stopper. Remove the funnel from the iron ring and shake vigorously to mix the layers, periodically venting to release pressure. Place the separatory funnel back in the Iron ring. Allow the layers to physically separate in the funnel. Remove the cap.Drain the bottom layer into a labeled beaker. Label the beaker "Organic Layer". Drain the remaining liquid into a labeled beaker. Label this beaker "Aqueous Layer". Transfer the "Organic Layer" back to the empty separatory funnel. Repeat all steps.Notes:
The letters have been replaced with numbers only to clarify the order of the steps. No changes were made to the steps themselves, including any stylistic errors.A very few set of sequential steps might be interchangeable, but the steps as separated and organized above is in accordance with standard liquid-liquid extraction protocol.Determining which layers are the "organic" and "aqueous" layers (i.e., whether the organic/aqueous layer, or vice-versa, is on the bottom/top ) is a nontrivial step; for this reason, when actually doing such extractions, the beakers (or whatever vessel) into which the layers are drained at any step are sometimes labeled "top layer" and "bottom layer" in case you misidentify which layers are, in fact, the organic and aqueous layers. Oftentimes, the organic layer is on top of the aqueous layer as many common organic solvents are less dense than water. Halogenated organic solvents, like dichloromethane, are one of the exceptions, and so will generally comprise the bottom layer.How are ionic compounds named? (APEX!)
A. A number is given in parentheses after each elements name to indicate the number of atoms
B. The name of the first element is followed by that of the second element, the latter of which ends in -ide
C. The name of each element is followed by a To indicate the number of atoms
D. A prefix is used which each elements name, and the second element is change the end in -ine
The ionic compounds are named as The name of the first element is followed by that of the second element, the latter of which ends in -ide. Hence Option (B) is the correct.
What are Ionic Compound ?
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding.
The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.
For example, KCl, an ionic compound that contains K+ and Cl- ions, is named potassium chloride.
Therefore, The ionic compounds are named as The name of the first element is followed by that of the second element, the latter of which ends in -ide. Hence Option (B) is the correct.
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Use the solubility rules from the Lab 4 introduction and your knowledge of qualitative separation schemes from the lab to answer the following questions.
The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag+, K+, NH4+, Hg22+, Pb2+, Mg2+, Sr2+, Ba2+, Cu2+, Al3+ and Fe3+.
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl? (Hint: HCl is a source of chloride ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(b) After the addition of HCl, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2SO4? (Hint: H2SO4 is a source of sulfate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(c) After the addition of H2SO4, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2CO3? (Hint: H2CO3 is a source of HCO3− and carbonate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(d) Choose one of the cations above and write the net precipitation reaction that occurs. (Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer.)
Cu2+(aq) + (CO3)2-(aq) → CuCO3(s)
Your answer contains an improperly or incompletely formatted chemical formula. Your answer contains improper superscript or subscript
Answer:
Explanation:
a ) silver chloride AgCl and lead chloride PbCl₂ Hg₂Cl₂ , are not dissolved in ware
so Ag⁺ and Pb⁺² Hg₂ ⁺² will precipitate out .
b ) BaSO₄ , SrSO₄ are insoluble
Ba⁺² and Sr⁺² will precipitate out .
c )
Al₂( CO₃)₃ , Fe₂(CO₃)₃ , CuCO₃ insoluble .
Al⁺³ and Fe⁺³ and Cu⁺² will be insoluble .
d )
2Fe⁺³(aq) + 3CO₃⁻²(aq) = Fe₂(CO₃)₃ (s)
Please help, I will give brainliest
The energy associated with motion is
a. kinetic energy
b. elastic potential energy.
c. gravitational potential energy.
d. nuclear energy
Answer:
Kinetic Energy
Explanation:
The form of energy associated with the motion, position, or shape of an object is called mechanical energy. An object's mechanical energy is a combination of its potential energy and its kinetic energy. The basketball has both potential energy and kinetic energy.
1. The elements in a compound
a. Combine by reacting with each other
b. Join in a specific ratio
c. Can be separated using chemical means
d. All of the above
Answer:
d.All of the above
Explanation:
They can do all of the above
In order for an organism to survive, what must it do?
stay healthy
select a habitat
regenerate
reproduce
Answer:
Stay Healthy/ A
Explanation: k12
Answer: stay healthy
Explanation: got it in k12 have a g day
WILL GIVE BRANLIEST‼️
Answer:
its c
Explanation:
Answer:
The answer is.......... C!
Explanation:
Studying the solar system helps scientists learn about the universe. Why might a scientist use a model to represent the solar system? A. The actual solar system moves too slowly B. The actual solar system is too large O C. The actual solar system is too simple D. The actual solar system is too small
Answer:D- the actual solar system is too large
Explanation: just took the quiz
Answer: The actual solar system is to large.
Explanation: well it's not because its to small and definitely not because it's too simple. and because it moves slowly doesn't make sense. so its B. hope this helps :)
U
Question 13
4 pts
Using the formula Na + Cl2 --> NaCl, if 3.93 moles of chlorine are combined
with excess* sodium, how many moles of sodium chloride will be made? Note
that in this question, excess means extra or as much as you need.
Answer:
7.86 moles of sodium chloride are produced.
Explanation:
Given data:
Moles of chlorine = 3.93 mol
Amount of sodium = excess
Moles of sodium chloride formed = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
Now we will compare the moles of sodium chloride with chlorine.
Cl₂ : NaCl
1 : 2
3.93 : 2×3.93 = 7.86
Chlorine is limiting reactant that's why we compare the NaCl with only number of mole of chlorine.
Thus, 7.86 moles of sodium chloride are produced.
A gas in a large syringe has a volume of 300ml at 45°C. The temperature is lowered to 30°C. What is the new volume of the gas in the syringe? (N and p are constant). Hint:Convert temperature to kelvin before calculating (°C+273=K)
Answer:
V1=300ml
V2= x ml
T1= 45 Celsius
T2= 30 celcius
Do the math....
you will get
318x=90900
divide by 318
x=285.8 ml (rounded)
Explanation:
you have to add 45 and 30 (separately because the temp. has to be in kelvin) to 273... so V2 equals 2858.8 ml
Which statement best describes the nuclear model of the atom. A) negative charges dispersed in a positively charged cloud B) positive charges dispersed in a negatively charged cloud C) small, dense positive nucleus surrounded by a diffuse negatively charged cloud D) small, dense negative nucleus surrounded by a diffuse positively charged cloud
Answer:
D.) small, dense negative nucleus surrounded by a diffuse positively charged cloud
Explanation:
I am not 100% sure but the reason I think this is the answer is because Protons and Neutrons are in the nucleus. Protons being positively charged and neutrons being negatively charged. Again, I do not know for sure, but I think D is the answer.
The statement that best describes the nuclear model of the atom is C) small, dense positive nucleus surrounded by a diffuse negatively charged cloud.
The atom is made up of 3 kinds of particles: protons, neutrons and electrons.
Protons (positive charge) and neutrons (zero charge) are in the nucleus, which concentrates 99% of the mass of the atom in 1% of the space. This is why is it positive and very dense.
Electrons (negative charges) are orbiting the nucleus in diffuse negatively charged clouds known as orbitals.
The statement that best describes the nuclear model of the atom is C) small, dense positive nucleus surrounded by a diffuse negatively charged cloud.
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Earth is a single interconnected system. True False
Answer:
True
Explanation:
Earth is a single interconnected system but it can be subdivided into smaller systems.
Which of the following elements would be expected to have the highest electronegativity?
1. As
2. Li
3. P
4. Al
5. Ge
Answer:
option (3) P is the correct answer.
Explanation:
electronegativity of As is 2.0
electronegativity of Li is 1.0
Electronegativity of P is 2.1
Electronegativity of Al is 1.5
electronegativity of Ge is 1.6
So P (phosphorus) would be expected to have highest electronegativity.
Electronegativity measures the Capability of an atom to pull the shared paired of electrons.
Electronegativity is determined by the following factors
nuclear charge.
the number and the location of different electrons inside the atomic shells.
Explain why non ionic compounds are soluble in water ?
10)
Identify the correct formula for hydrochloric acid.
A)
HCL
B)
HCLO
HCLO4
D)
H2C1
What is the end
result of a chemical reaction?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
The end of a chemical reaction is the product.
What is a chemical reaction?
A chemical reaction contains a reactant that reacts to form products. The reactant can be more than two, and the product can be two or more.
Food spoiling is a chemical reaction because it has an unpleasant odor, taste, and color change. Fruits undergo a chemical shift as they ripen. For instance, both the texture and color may change.
When we balance a chemical process, the number of moles or atoms on the left must match the amount on the right. Thus, the atoms participating in such a chemical process are discovered to have mass.
Chemical elements are uncontaminated by impurities or other elements and are pure substances made up of just one type of atom. They are found in the crust of the earth. Carbon, hydrogen, and oxygen are some examples.
Therefore, the end is the product.
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What is a product made from nonrenewable resources?
a shirt made from natural plant fibers
a bookshelf made from wood
a nail made from the metal iron
a paintbrush made from horse hair
Answer:
C. a nail made from the metal iron
Explanation:
I did the test.
The product made from non-renewable resources is nail made from the metal iron.
What are nonrenewable resources?Non renewable resources are materials that do not replenish themselves but they are easily exhausted or diminished after a period of time.
Therefore, The product made from non-renewanleable resources is nail made from the metal iron.
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how many oxygen atoms are there in six dinitrogen monoxide molecules? express your answer as an integer
Answer:
6 oxygen atoms
Explanation:
Step 1: Given data
Number of dinitrogen monoxide molecules (N₂O): 6
Number of oxygen atoms (O): ?
Step 2: Calculate the appropriate ratio
The ratio of dinitrogen monoxide molecules to oxygen atoms is 1:1.
Step 3: Use the ratio to calculate the number of oxygen atoms
6 molecule N₂O × (1 atom O/1 molecule N₂O): 6 atom O
What is the molar mass of an unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 °C?
Answer:
48.9 g/mol
Explanation:
n=(atm x v)/(.08206 x 298)
The molar mass of the gas 49.0 g/mol.
Given:
Unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 °C.
To find:
The molar mass of an unknown gas.
Solution:
The mass of gas = m
The volume of the gas =V
The molar mass of the gas = M
The density of the gas = d = 2.00 g/L
[tex]d=\frac{m}{V}[/tex]
The pressure of the gas = P
The temperature of the gas T = 25.0 °C = 25.0+273.15 K=298.15 K
The ideal gas equation:
[tex]PV=nRT\\\\PV=\frac{\text{Mass of gas(m)}}{\text{Molar mass of gas(M)}}RT\\\\PM=\frac{m}{V}RT \\\\PM=dRT\\\\1 atm\times M=2.00 g/L\times 0.0821 atm L/molK\times 298.15 K\\\\M=\frac{2.00 g/L\times 0.0821 atm L/molK\times 298.15 K}{1 atm}\\\\M=48.96 g/mol \approx 49.0 g/mol[/tex]
The molar mass of the gas 49.0 g/mol.
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why do we fill balloons with helium gas instead of oxygen gas
Answer: cause oxegeon is harmful then helium
Explanation:
does hydrogen builds all the acids??
Answer:
hydrogen builds many acids but not all
Which of the following is an example of a reaction that you've seen in your everyday life?
Question 5 options:
Ice melting
Salt dissolving
Water freezing
Fire burning
Answer:
water freezing
Explanation:
i think so
This image represents what?
A) Atom of nitrogen
B) mixture of nitrogen atoms
C) compound containing nitrogen
D) molecule of diatomic nitrogen
Answer:
IT’S D)molecule of diatomic nitrogen
Explanation:
Thx to the person above though..........
Answer:
D
Explanation:
A system initially has a pressure of 12 atm and a volume of 9 L. What is the volume if the pressure is decreased to 6 atm?
Answer:
The answer is 18 LExplanation:
In order to find the volume , we use the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question
P1 = 12 atm
V1 = 9 L
P2 = 6 atm
We have
[tex]V_2 = \frac{12 \times 9}{6} = \frac{108}{6} \\ [/tex]
We have the final answer as
18 LHope this helps you
1. Why is the metal heated in a dry test tube rather than just putting it straight into the boiling water?
Answer:
Students heat up a metal sample by placing it into a test tube suspended in boiling water. Since the water is boiling, the metal evnetually reaches the same temperature as the boiling water: 100oC. ... Putting the metal sample directly into the water – obviously – gets it wet.
The metal is heated in a dry test tube in order to measure the capacity of the metal.
When performing a chemical experiment, it is important to
Have your materials readyMake sure that the mixtures and elements are in the right amountTry as much as possible to have a controlled experimentInstead of putting the metal straight into the boiling water, it is necessary to measure the capacity by heating it in a dry test tube first.
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which common substance is an acid?
Answer:
sulfuric acid, phosphoric acid, and nitric acid, citric acid
Explanation: