Answer:
10.1 M
Explanation:
Applying,
pH = -log(H⁺).................... Equation 1
But,
[H⁺][OH⁻] = 1×10⁻¹⁴................ Equation 2
Where [H⁺] = Hydrogen ion concentration, [OH⁻] = Hydroxyl ion concentration.
From the question,
Given: [OH⁻] = 1.25×10⁻⁴ M
Substitute into equation 2
[H⁺][1.25×10⁻⁴] = 1×10⁻¹⁴
[H⁺] = 1×10⁻¹⁴/1.25×10⁻⁴
[H⁺] = 0.8×10⁻¹⁰ M
[H⁺] = 8×10⁻¹¹ M
Also, Substitute the value of [H⁺] into equation 1
pH = -log[8×10⁻¹¹]
pH = 10.1 M
Help, please I don't understand what I have to do
Answer:
Is there a picture To go with this?
Explanation:
a physical change is change
that
a, forms a substance with new composition
b, results in the formation of new properties
c, results in the formation of new substance
d, does not alther the composition of the substance
Answer:
The answer is D
Explanation:
All the other options are associated with chemical change
Answer:
D
Explanation:
when we say phisical change it is change of phisical so it does not change the composition because when we say it alther the composition it will be chemical change.
Which compound is an exception to the octet rule?
H2O
OHCI
OCCIA
CIF3
Answer:
CIF3
Explanation:
Edge completion
Which of the following is an acid-base neutralization reaction?
A) C3H8 + 5 O2 --> 3 CO2 + 4H20
B) 2 MgO + O2 --> 2 Mgo
C) Pb(NO3)2 + 2KI --> 2 KNO3 + Pblz
D) H2SO4 + 2 KOH --> K2SO4 + 2 H2O
Answer:
Explanation:
Answer: D
STRONG ACIDS:
HBr
HCl
HI
HNO3
HClO4
H2SO4
What is family and it's importance
Answer:
FAMILY:Family is defined as a specific group of people that may be made up of partners, children, parents, aunts, uncles, cousins and grandparents. An example of a family is a set of parents living with their children. The definition of family is the group of people who share common ancestors.
IMPORTANCE:Family is very important part of our everyday life. It helps us in improving our personality. It also helps us in shaping our life. It teaches us the value of love, affection, care, truthfulness and self-confidence and provides us tools and suggestions which are necessary to get success in life. Family is a place where you can be yourself. It is a place where you are accepted for what you are. This is where you are completely tension free and everyone is there to help you. Family encourages you when you are surrounded by problems. It helps you survive through tough times and bring joy and happiness into life.
I have 2.000 moles of potassium (K). How many grams of potassium chloride (KCl) can I make?
Answer:
You can make 149.1g of KCl
Explanation:
1 mole of potassium chloride, KCl, contains 1 mole of potassium, K. That means, with 2.000 moles of K we can make 2.000 moles of KCl. To solve this question we must convert these moles of KCl to mass in grams using its molar mass (Molar mass KCl = 74.5513g/mol):
Mass KCl:
2.000 moles KCl * (74.5513g / mol) =
You can make 149.1g of KClwhen 3.18g of copper(ii)oxide was carefully heated in a stream of dry hydrogen, 2.54g of copper and 0.72g of water was formed. Determine the number of moles of hydrogen atoms which combine with one mole of oxygen atoms. Show your working.
Answer:
hsbdgjvejsnshns gzjs svshs
Use the drop-down menus to match the alkanes with the correct name.
CH3CH2CH2CH2CH2CH2CH2CH3
CH3CH2CH2CH3
CH4
CH3CH2CH2CH2CH2CH2CH2CH2CH2CH3
CH3CH3
the answers are :
octane
butane
methane
decane
ethane
Answer:
✔ octane
CH3CH2CH2CH2CH2CH2CH2CH3
✔ butane
CH3CH2CH2CH3
✔ methane
CH4
✔ decane
CH3CH2CH2CH2CH2CH2CH2CH2CH2CH3
✔ ethane
CH3CH3
Explanation:
An alkane contains only carbon and hydrogen. The following are the accurate names of the compounds;
CH3CH2CH2CH2CH2CH2CH2CH3 - octaneCH3CH2CH2CH3 - butaneCH4 - methaneCH3CH2CH2CH2CH2CH2CH2CH2CH2CH3 - decaneCH3CH3 - ethaneWhat is an alkane?An alkane is a compound whose only functional group is the carbon - carbon single bond. This compounds contain only carbon and hydrogen.
The correct names of the compounds are;
CH3CH2CH2CH2CH2CH2CH2CH3 - octane
CH3CH2CH2CH3 - butane
CH4 - methane
CH3CH2CH2CH2CH2CH2CH2CH2CH2CH3 - decane
CH3CH3 - ethane
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Influences the loudness of a sound
Find the force of an object that has an acceleration of 6.7 m/s2 and a mass of 12 kg.
If we view a new moon tonight, how many weeks will pass before we view a full moon?
If we view a new moon tonight, 4 weeks will pass before we view a full moon. The sole natural satellite of Earth is the Moon.
What is moon?The sole natural satellite of Earth is the Moon. With a diameter that is around one-fourth that of the Earth, it's the fifth biggest satellite inside the solar system as well as the largest and also most massive when compared to its parent planet. The Moon is larger than any other dwarf planets of a Solar System and belongs to a planetary-mass body with a distinct rocky body, rendering this a satellite planet according to geophysical interpretations of the term.
There isn't much of an atmosphere, hydrosphere, and magnetic field there. With a surface gravity of 0.1654 g, it has a gravity that is around one-sixth that of Earth. Jupiter's moon Io is the only satellite inside the Solar System that is documented to have a higher gravity and density. If we view a new moon tonight, 4 weeks will pass before we view a full moon.
Therefore, if we view a new moon tonight, 4 weeks will pass before we view a full moon.
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how many moles of iron are in 4.8 x 10^24 atoms of iron
Answer:
7.97 moles
Explanation:
The number of moles (n) of iron (Fe) in this question can be calculated by dividing its number of atoms by Avogadro's number (6.02 × 10²³ atoms).
That is;
n = number of molecule ÷ Avogadro's number
According to this question, the number of atoms of Fe is given as 4.8 x 10²⁴ atoms.
Hence,
n = 4.8 x 10²⁴ ÷ 6.02 × 10²³
n = 4.8/6.02 × 10^(24-23)
n = 0.797 × 10¹
n = 7.97 moles
name any ten trainings that provide the opportunity of foreign employment
Answer:
• Abogado
• Administrador o conservacionista de campo
• Agrícola o agrónomo
• Apiculturísta
• Arquitecto
• Arquitecto ambiental
• Asistente de investigación
• Astrónomo
• Bioquímico
• Científico animal
• Científico avícola
• Científico de suelo
• Consejero vocacional
• Contador
• Criador animal
• Economista
• Entomólogo
• Epidemiólogo
• Farmacólogo
• Físico
• Fitogenetista
• Forestal
• Genetista
• Geoquímico
• Geofísico
• Horticultor
• Ingeniero
• Matemático (incluyendo estadístico)
• Meteorólogo
• Nutriólogo
• Profesor
• Químico
• Silviculturiasta (incluyendo forestalista)
• Terapeuta recreativo
• Topógrafo
• Trabajador social
• Urbanista (incluyendo geógrafo)
• Zoologísta
• Técnico científico de cualquiera de las siguientes disciplinas: ciencias agrícolas, astronomía, biología, química, ingeniería, silvicultura, geología, geofísica, meteorología o física
Explanation:
1.
How does light behave when it is shined on an object?
Answer:
Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. For a smooth surface, reflected light rays travel in the same direction.
Explanation:
What is Permeability
i think i put it in the wrong one..
Answer:
the state or quality of a material or membrane that causes it to allow liquids or gases to pass through it.
Which of the following is not true?
a) Staic cling or electrostatic attraction is never useful
b) lighting bolts are giant sparks caused by the build up of static charge
C) static cling cause plastic wrap to stick to your lunch
D) people who work on computer parts must reduce net the net static charges on objects to avoid damging sensetive circuits
E) static charges must be reduced in many situations to protect people and equitment
Answer: C i believe
Explanation: Common sense
Metal M has only one oxidation state and forms a compound with the formula MHCO3. Which formula is correct? A.MNO3 b.MNH4 c.M(NO3)2 d.MPO4
Answer:
The compound with the correct formula is;
A. MNO₃
Explanation:
The number of oxidation states in the metal, M = One oxidation state
The formula of the compound formed by the metal, M = MHCO₃
We note that the ion HCO₃⁻, known as hydrogen carbonate has an oxidation number of -1
Similarly nitrate, NO₃⁻ has an oxidation number of -1, therefore, the metal M can form similar compound formed with HCO₃⁻ with nitrate, and we have;
The possible compounds formed by the metal 'M' includes MHCO₃ and MNO₃.
Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices. (1) Electron loss is always associated with an increase in oxidation number. (2) An exothermic reaction occurs when the energy required to break bonds in reactants is less than the energy released by bond formation in the products. (3) The concentrations of pure liquids and pure solids are never included in an equilibrium constant expression because such concentrations never change.
Answer:
Electron loss is always associated with an increase in oxidation number- True
An exothermic reaction occurs when the energy required to break bonds in reactants is less than the energy released by bond formation in the products. True
The concentrations of pure liquids and pure solids are never included in an equilibrium constant expression because such concentrations never change. True
Explanation:
Oxidation implies loss of electrons. When a specie looses electrons, its oxidation number increases. For instance; Fe(s) -----> Fe^2+(aq) + 2e implies an increase in oxidation number of Fe from 0 to +2.
In an exothermic reaction, the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products.
We do not include the concentrations of pure liquids and pure solids in the equilibrium constant expression because the concentration of these do not change significantly throughout the reaction.
15.0 g of potassium chlorate is melted so that it will then decompose. What mass of oxygen is produced assuming all of the original potassium chlorates fully decomposes?
Answer:
5.875 g of Oxygen
Explanation:
We must first balance our decomposition equation KClO3 -> K + ClO3
The amount of oxygen in CLO3 is 3 times the original. We begin by converting 15g of KClO3 to moles. 15 / (39.1 + 35.45 + 3(16) ) = 0.122 mols.
Then we go to moles of oxygen,
.122 * 3 = 0.367 mols of Oxygen
Then to grams of Oxygen
.367 * 16 = 5.875 g
What will the pH of 1.50 L of pure water water be if 2.0 mL of 4.0 M HCl is added? By how much has the pH changed? What will the pH of the solution in part b be if 2.0 mL of 4.0 M HCl is added? By how much has the pH changed?
Answer:
Part A
pH ≈ 2.273
Part B
ΔpH ≈ -4.726
Part C
pH ≈ 1.973
Part D
ΔpH ≈ -0.301
Explanation:
Part A
The pH of a solution is given by the negative concentration of hydrogen ions in the solution
2.0 mL = 0.002 L
The number of moles of HCl in 2.0 mL of 4.0 M HCl is given as follows;
1 Liter of 4.0 M HCl contains 4.0 moles of HCl
2.0 mL = 0.002 L 4.0 M HCl contains 0.002 L/(1 L) × 4.0 M = 0.008 moles of HCl
The concentration of 0.008 moles in 1.50 L is given as follows;
Concentration = The number of moles/(The volume in liters)
∴ The concentration of 0.008 moles in 1.50 L, C = 0.008 moles/(1.5 L + 0.002 L)
∴ The concentration of 0.008 moles in 1.50 L, C ≈ 0.00533 moles/liter = 0.00533 M HCl
Given that HCl is a strong acid, we have that HCl dissociates completely to give equal number of H⁺ and Cl⁻ ions;
The number of moles of [H⁺] in the solution = 0.00533 moles
The pH of the solution = -log[H⁺]
∴ pH = -log[5.33 × 10⁻³] ≈ 2.273
The pH of the 1.5 L of pure water will be approximately 2.273
Part B
The pH of the pure water has changed from neutral (pH = 7) tp pH = 2.273
The change in pH is ΔpH = 2.274 - 7 = -4.726
ΔpH ≈ -4.726
Part C
When 2.0 mL of the 4.0 M HCl is added, the solution above, we have;
C = (0.008 + 0.008)/(1.5 + 0.002 + 0.002) ≈ 1.06383 × 10⁻²
The concentration of the solution becomes, C ≈ 1.06383 × 10⁻² mole/liter
The pH becomes, pH = -log(1.06383 × 10⁻²) ≈ 1.973
Part D
The amount by which the pH has changed, ΔpH ≈ 1.973 - 2.274 = -0.301.
someone, please help me find the missing planets
Answer:
planet A: Saturn
planet B: Mars
planet C: Venus
planet D: Uranus
Explanation:
Answer:
A is Saturn
B is Mars
C is Venus
D is Neptune
Explanation: Saturn is known for its rings and it's the 6th planet on the Solar System. Mars is indeed quite red and it is in the inner comet belt
C is Venus because a day is longer than a year on Venus and D is Neptune because it's a blue and green gas giant.
Give two examples of an ionic compound. Chemical name and chemical structure.
Considere un elemento "X" que posee como valencias 2, 4 y 6. En su nomenclatura tradicional, considerando la valencia cuatro, ese compuesto debería considerar la terminación:
Answer:
"ite"
Explanation:
Se sabe que los elementos del grupo 16 de la tabla prioritaria muestran estados de oxidación o valencias de 2,4 y 6 respectivamente, dependiendo del compuesto formado.
Por ejemplo, el azufre forma los siguientes compuestos;
sulfato de sodio (el azufre tiene una valencia de 6)
Sulfito de sodio (el azufre tiene una valencia de 4)
Sulfuro de sodio (el azufre tiene una valencia de 2)
Por lo tanto, en compuestos en los que exhiben una valencia de 4, la terminación común es "ite"
Answer:
ite
Explanation:
Hope this helps
Read the scenario and match the symbiotic relationship.
Question 1 options:
commensalism
mutualism
parasitism
1.
Nitrogen-fixing bacteria get a place to live and food in the roots of plants while helping the plant
2.
Bromeliads are plants that live in the tall trees in the rainforest. The tree is not harmed by them.
3.
Ticks can attach to the skin of humans or other mammals. The ticks feed on the blood to grow.
Answer:
__3__parasitism-Ticks can attach to the skin of humans or other mammals. The ticks feed on the blood to grow.
__1__mutualism-Nitrogen-fixing bacteria get a place to live and food in the roots of plants while helping the plant.
__2__commensalism-Bromeliads are plants that live in the tall trees in the rainforest. The tree is not harmed by them.
Explanation:
The word that describes each statement would be mutualism, commensalism, and parasitism respectively.
What is symbiosis?It is a form of interaction involving two organisms of different species.
There are different types of symbiotic interactions:
Commensalism: one of the organisms gains from the other. The other organism neither gains nor gets hurt from the interaction.Mutualism: both interacting organisms benefit from the relationship without losing in any way.Parasitism: One organism, the parasite, benefits while the other, the host, is harmed. This often leads to the death of the host.More on symbiotic relationships can be found here:https://brainly.com/question/3350498
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Different relative positions of the sun, the moon, and Earth have different effects on Earth's oceans. Which model shows the positions of the sun, the moon, and Earth that have the greatest effect on ocean tides?
Answer:
b
Explanation:
Answer:
it is j.
Explanation:
Brainliest if correct!!!!!
Determine which of the following statements is true.
A. A catalyst causes equilibrium to be reached faster without changing the position of the equilibrium.
B. A catalyst causes the reaction to move more slowly so that the equilibrium position can be precisely adjusted.
C. A catalyst raises the activation energy of a reaction.
D. A catalyst speeds up the rate of the forward reaction which moves the equilibrium towards the products.
Answer:
A
Explanation:
A catalyst speeds up a reaction by lowering the required activation energy, so it's not B. Like previously stated, the catalyst lowers the activation energy required, so it's not C either. This leaves us with A. Just to double check, does a catalyst speeds up a reaction? Yes! So like it says in A, a catalyst causes the equilibrium to be reached faster. Have a nice day! :)
Catalysts speed up a chemical reaction by causing equilibrium to reach quickly while maintaining the equilibrium's position. Thus, option A is true.
What are catalysts?
A catalyst increases the reaction rate by decreasing the activation energy of the reaction. As the minimum energy required by the reactants for the reaction is decreased the rate of the formation of products increases.
During the reaction, the catalyst remains unchanged and does not undergo any chemical change. It can increase the reaction rate of both irreversible and reversible reactions.
In an equilibrium reaction, the catalyst can increase the rate of both forward and reverse reaction by reaching the reaction equilibrium at a faster rate and can move the reaction toward the products as well as a reactant.
Therefore, the catalyst causes equilibrium to be reached faster.
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Set up the conversion chart below to find how many molecules are in 4.6 moles of ammonium nitrate (NH4NO3
)?
Answer: There are [tex]27.701 \times 10^{23}[/tex] molecules in 4.6 moles of ammonium nitrate [tex](NH_{4}NO_{3})[/tex].
Explanation:
According to the mole concept, there are [tex]6.022 \times 10^{23}[/tex] molecules present in 1 mole of every substance.
Hence, the number of molecules present in 4.6 moles of ammonium nitrate are calculated as follows.
[tex]4.6 \times 6.022 \times 10^{23}\\= 27.701 \times 10^{23} molecules[/tex]
Thus, we can conclude that there are [tex]27.701 \times 10^{23}[/tex] molecules in 4.6 moles of ammonium nitrate [tex](NH_{4}NO_{3})[/tex].
KMnO4 ->K20 +Mno +02
If an object is not accelerating, you can be sure that
A. its speed is 0 m/s.
B. it has a mass of 0 kg.
c. the net force acting on it is O N.
Answer:
A
Explanation:
It's not moving so it would be going 0 meters per second
Answer:
I think its A
Explanation:
A gas has a volume of 1.22L at 179K. Once heated, the same gas now has a volume of 6.1L at 285K and 1.34atm. What was the original pressure of the gas?