Answer:
Kw = 1×10⁻¹⁴
Explanation:
The product between the [H₃O⁺] . [OH⁻] talks about the
autoionization of water.
2H₂O ⇄ H₃O⁺ . OH⁻ Kw
This is an equilibrium of 2 molecules of water that produces 1 mol of hydronium and 1 mol of hydroxides.
In order to determine pH and pOH, parameters to indicate acidic or basic solutions we know:
- log [H₃O⁺] = pH
- log [OH⁻] = pOH
When [H₃O⁺] or [OH⁻] = 1×10⁻⁷ , pH or pOH = 7 (Neutral solutions)
So if we see the equation above, we have an equilibrium.
In order to determine Kw, we need [H₃O⁺] . [OH⁻]
As [H₃O⁺] and [OH⁻] = 1×10⁻⁷ , Kw = 1×10⁻¹⁴
The product of [H₃O⁺] and [OH⁻] is 1 × 10⁻¹⁴. The correct option is the first option - 1 x 10-14
The ionization constant of water, Kw, is the product of [H₃O⁺] and [OH⁻]
That is,
Kw = [H₃O⁺][OH⁻]
In pure water, [H₃O⁺] = [OH⁻] = 1 × 10⁻⁷
∴ Kw = [H₃O⁺][OH⁻] = 1 × 10⁻⁷ × 1 × 10⁻⁷
Kw = [H₃O⁺][OH⁻] = 1 × 10⁻¹⁴
Hence, the product of [H₃O⁺] and [OH⁻] is 1 × 10⁻¹⁴. The correct option is the first option - 1 x 10-14
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The pH and pOH scales represent concentrations of [H3O+] and [OH−], respectively. What are the hydronium ion concentration and the hydroxide ion concentration of pure water at 25 °C?
Answer:n
Explanation:
science helpppppppppppppppppppppppppppppppp
Answer: it should be 80g
Explanation:
A gas is collected at 20.0 °C and 725.0 mm Hg. When the temperature is
changed to 0 °C, what is the resulting pressure?
Answer:
676mmHg
Explanation:
Using the formula;
P1/T1 = P2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 725.0mmHg
P2 = ?
T1 = 20°C = 20 + 273 = 293K
T2 = 0°C = 0 + 273 = 273K
Using P1/T1 = P2/T2
725/293 = P2/273
Cross multiply
725 × 273 = 293 × P2
197925 = 293P2
P2 = 197925 ÷ 293
P2 = 676mmHg.
The resulting pressure is 676mmHg
I didn’t study for this lol if your answer correct I’ll mark ur answer brainliest
Answer:
3
Explanation:
3 is the answer is did this a little while ago
For the reaction
2 Al + 6 HCl → Al2Cl6 + 3 H2
how much hydrogen can be formed when 60 g
of aluminum reacts with excess hydrochloric
acid?
Answer in units of g.
Answer:
6.67 grams of hydrogen can be formed when 60 g of aluminum reacts with excess hydrochloric acid.
Explanation:
The balanced reaction is:
2 Al + 6 HCl → Al₂Cl₆ + 3 H₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al: 2 moles HCl: 6 moles Al₂Cl₆: 1 mole H₂: 3 molesBeing the molar mass:
Al: 27 g/mole HCl: 36.45 g/mole Al₂Cl₆: 266.7 g/moleH₂: 2 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al: 2 moles* 27 g/mole= 54 grams HCl: 6 moles* 36.45 g/mole= 218.7 gramsAl₂Cl₆: 1 mole* 266.7 g/mole= 266.7 gramsH₂: 3* 2 g/mole= 6 gramsYou can apply the following rule of three: if 54 grams of aluminum forms 6 grams of hydrogen, 60 grams of aluminum will form how much mass of hydrogen?
[tex]mass of hydrogen=\frac{60 grams of aluminum*6 grams of hydrogen}{54 grams of aluminum}[/tex]
mass of hydrogen= 6.67 grams
6.67 grams of hydrogen can be formed when 60 g of aluminum reacts with excess hydrochloric acid.
Please help with this chem question I’ll mark you brainiest. The answer isn’t A) I already tried that option.
A gas has a pressure of 500.0 Torr at 35.0 °C. What is the temperature at
standard pressure?
Answer:
466.65 K
Explanation:
Using the formula of Pressure law,
P/T = P'/T'.................... Equation 1
Where P = Intial pressure of gas, T = Initial temperature of gas, P' = Final pressure of gas, T' = Final temperature of gas.
make T' The subeject of equation 1
T' = (P'T)/P................... Equation 2
From the question,
Given: P = 500 Torr = (500×133.322) N/m² = 66661 N/m², T = 35°C = (35+273) = 308 K, P' = 101000 N/m²( Standard pressure)
Substitute these values into equation 2
T' = (101000×308)/66661
T' = 466.65 K
Gallium is a metallic element in Group III. It has similar properties to aluminium.
(a) (i) Describe the structure and bonding in a metallic element.
You should include a labelled diagram in your answer.
Answer:
Gallium has Orthorhombic and forms ionic bonds with metals
Explanation:
The structure of gallium is Orthorhombic and it has a high neutron capture cross section. It is very stable in dry air but oxidizes in moist air. It reacts with oxygen to form Ga2O3. It has a valence of III. Its electronic configuration is
Ar 3d10 4s2 4p1
It is found in the 3A group of periodic table and it mostly forms ionic bonds with metal.
Richard wrote a list of the advantages of using any one of the six simple machines. His list is below. Which statement about simple machines is not correct?
A.
Some simple machines produce an output force greater than the input force.
B.
Some simple machines produce an output force in a different direction than the input force.
C.
Some simple machines have a work output greater than the work input.
D.
Some simple machines increase the distance through which a force is applied.
Plss say just A,b,c, or d :/
Answer:
c
Explanation:
just took the test 100 on it the test is simple machines
La predicción de las propiedades de un elemento en función de la posición que ocupa en el sistema periódico es una
Answer:
Los elementos de la tabla periódica se distribuyen sobre la base de similitudes.
Explicación:
Los diferentes tipos de elementos se distribuyen en 8 grupos de tabla periódica en función de sus propiedades. Los elementos que tienen propiedades similares se colocan en el mismo grupo. Por ejemplo, el primer grupo de la tabla periódica son los metales alcalinos. Todos los metales alcalinos tienen algunas propiedades similares, es decir, un electrón en su capa más externa, alta reactividad y forma metálica, mientras que, por otro lado, los ocho elementos del grupo son gases nobles que tienen una capa más externa completa y no tienen reactividad.
Where can you find the atomic mass?
Answer:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Explanation:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Predict whether a reaction will occur when HClO and Sr(OH)2 solutions are mixed, if yes determine spectator ions in the ionic equation.
Answer:
[tex]ClO^-\\\\Sr^{2+}[/tex]
Explanation:
Hello there!
In this case, according to the reaction between hypochlorous acid and strontium hydroxide which yields stontium hypochlorite and water as a neutralization reaction:
[tex]2HClO(aq)+Sr(OH)_2(aq)\rightarrow Sr(ClO)_2(aq)+2H_2O(l)[/tex]
Thus, since HClO is a weak acid, it is not fully ionized so the complete ionic equation turns out to be:
[tex]2H^++2ClO^-+Sr^{2+}+2(OH)^-\rightarrow Sr^{2+}+2(ClO)^-+2H_2O(l)[/tex]
Whereas the spectator ions, which remain the same at both sides of the equation, are:
[tex]ClO^-\\\\Sr^{2+}[/tex]
Best regards!
How long does cream of tartar activate
How many grams of carbon dioxide are produced when 255 grams of octane (C3H18) combust?
Answer:
787.3 g of CO₂
Explanation:
The combustion of octane is this one:
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O
2 moles of octane react to 25 moles of oxygen in order to produce 16 moles of CO₂ and 18 moles of water.
The products in combustion reactions are always CO₂ and H₂O. The oxygen is always a reactant.
We convert mass to moles: 255 g . 1mol /114g = 2.24 moles
2 moles of C₈H₁₈ can produce 16 moles of CO₂
Then, 2.24 moles may produce (2.24 . 16)/2 = 17.9 moles of CO₂
We convert moles to mass:
17.9 mol . 44g/mol = 787.3 g of CO₂
pleeeassee
Carbon has unique bonding characteristics that allow it to
A
form ionic bonds with any atom to form many different molecules.
B
resist bonding with other atoms and remain a pure element.
C
form chains or rings by bonding to itself and other atoms.
D
form ionic salts that make up half of the known salts on Earth.
What volume will 1000 grams of nitrogen dioxide occupy at 380 mmHg at 0°C
0.69(78)Explanation:
Rayden is taking a Life science course in absence of Ms. Leesa and tells the students that Organelle X is where genetic information is stored.
Answer: good for him
Explanation: jk
its the dna which is in the NUCLEAS which is probably the answer
GOOD LUCK
How many electrons can be described by the quantum numbers n = 2,1 – 3?
Answer:
a maximum number of 10 electrons can share
Explanation:
How many electrons in an atom can have quantum numbers of N 3 and ML 2?
Therefore, a maximum number of 10 electrons can share these two quantum numbers in an atom.
Please help me with this net ionic chem equation
Answer:
C) H+(aq) + OH-(aq) ---》 H2O(aq)
Potato farmers in Ireland during the mid 1800s all grew the same type of potato. The potato plants were all produced as clones of one another. When a fungus infected the crop, all of the potatoes were destroyed. This occurred because these potato plants
Answer:
The crop failures were caused by late blight, a disease that destroys both the leaves and the edible roots, or tubers, of the potato plant.
What bonds might form in a carbon atom with sp2 hybrid orbitals?
O A. four single bonds
OB. a double bond and two single bonds
O c. a triple bond and a double bond
OD. a triple bond and a single bond
A comb is rubbed with a piece of wool fabric and placed next to some scraps of paper.
The paper moves toward the comb. The movement of the paper is caused by —
static electricity
magnetic attraction
mechanical energy
chemical energy
Answer: static electricity
Explanation: rubbing the comb creates. Static charge to comb
A functional group is a specific arrangement of atoms in an organic compound that is acmpavle if characteristic reactions
Is this True or false
Does not having the word (chemical )before reactions make it false
Please help i would appreciate it
Explanation:
(a) a functional group is a special group of atoms or bonds in a compound that is responsible for the chemical reactions, behavior, and characteristics of that compound. (b) Functional group is present in both the compound is alcohol (-OH).
Functional groups are specific groupings of atoms within molecules that have their own characteristic properties, regardless of the other atoms present in a molecule. Common examples are alcohols, amines, carboxylic acids, ketones, and ethers.
Key Points
Functional groups are often used to “functionalize” a compound, affording it different physical and chemical properties than it would have in its original form.
Functional groups will undergo the same type of reactions regardless of the compound of which they are a part; however, the presence of certain functional groups within close proximity can limit reactivity.
Functional groups can be used to distinguish similar compounds from each other.
Key Terms
functional group: A specific grouping of elements that is characteristic of a class of compounds, and determines some properties and reactions of that class.
functionalization: Addition of specific functional groups to afford the compound new, desirable properties.
What pressure, in atm, would be equal to 798 mmHg?
Answer:
1.05 atm
It should be 1 atm = 760 mm; therefore, 798 mm x (1 atm/760) = about 1.05 atm.
The value of pressure in atm that would be equal to 798 mmHg is 1.05 atmospheric.
What is pressure?Pressure is a physical quantity or a kind of force which is perpendicularly applied on the surface area of any object so that force is equally distributed on that surface.
Pressure will be maesured by various unit and have relation with one another.
As we know that, 1 atm = 760 mmHg
Or 1 mmHg = 1/760atm
Given quantity of pressure is 798 mmHg and we calculate this quantity by multiply this value by 1/760 and we get,
798 mmHg = 798mmHg × 1/760atm/mmHg = 1.05 atm
Hence required value of pressure is 1.05 atm.
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why is detergent called soapless soap
Answer:
Detergents are referred to as soapless soaps because they have a washing action similar to soap but do not contain the typical chemical contents of soaps, such as sodium or potassium salts of long chain fatty acids.
Explanation:
What happens when Ba (barium) and O (oxygen) combine?
Answer:
Barium reacts with oxygen when exposed to air, forming a thin passivating layer of BaO on the surface. When ingnited, barium reacts with both oxygen and nitrogen, forming a mixture of BaO, Ba 3N 2 and BaO 2.
Explanation:
Answer:
So, one ion of barium neutralizes one ion of oxygen, and so those two combine to form barium oxide, BaO .
QUE VENTAJAS TIENE PARA LA PLANTA Y EL CULTIVO LA PERMANENCIA DEL POTASIO COMO CATION MONOVALENTE (K+)?
Explanation:
Son muchos los beneficios del catión monovalente (K+) en las plantas y cultivos, mencionaremos algunos:
-Interviene en el proceso de apertura y cierre de los estomas; el catión (k+) ayuda a que los estomas puedan realizar correctamente el proceso de la fotosíntesis es decir la absorción del dióxido de carbono para producir oxígeno y agua; este proceso ayuda a que la planta pueda fabricar su propio alimento es decir transformar materiales inorgánicos en orgánicos como azúcares y carbohidratos que son aprovechables por la planta para realizar diversas funciones catalíticas como la respiración celular,la fosforilación y la síntesis de proteínas; este proceso también contribuye a que la planta pueda almacenar y retener suficiente agua lo cual ayuda a evitar el estrés hídrico en la planta.
Por lo tanto si la planta tiene una buena concentración de potasio como catión monovalente(k+); es posible que tenga un buen crecimiento y desarrollo radicular ,así mismo la calidad de los cultivos será muy buena,seran cultivos muy nutritivos y saludables. Algunos cultivos que necesitan una alta cantidad de potasio son los cítricos y el banano.
Use the scenario to answer the following question.
A group of students working in a chemistry lab is planning a procedure to neutralize 25.0mL of 2.0 M hydrochloric acid (strong acid) with 1.0 M potassium hydroxide (strong base). In their procedure they plan on adding an equal volume of the base to the acid.
What would be the expected outcome of carrying out this step as planned?
A.
The resulting pH will be equal to 7 because a strong base will neutralize a strong acid.
B.
The resulting pH will be less than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.
C.
The resulting pH will be greater than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.
D.
The resulting pH will not be able to be determined because the concentrations of the acid and base are not the same.
The expected outcome of carrying out this step as planned is :
B. The resulting pH will be less than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.
Acid and basesThe expected outcome of carrying out this step as planned is the resulting pH will be less than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.
pH may be a degree of how acidic/basic water is.
The run goes from - 14, with 7 being unbiased. pHs of less than 7 demonstrate causticity, while a pH of more noteworthy than 7 demonstrates a base.
pH is truly a degree of the relative amount of free hydrogen and hydroxyl particles within the water
Thus, the correct answer is B.
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2. Can you say that the matter which underwent a chemical change is still the
same substance as before? Why?
Answer:
No
Explanation:
A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.
The matter which underwent a chemical change is not still the same substance as before.
What is Chemical change?This is the type of change which occurs when two substances known as reactants react to form a new product.
The formation of a new product through bonding and other parameters thereby makes the substance to be different as it was before.
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Can someone please help a girl out and answer this plsss ...need this as soon as posible
Answer:
the anwser would be B obtain energy
Explanation: