The new concentration of hydroxide ions [OH-] is calculated as 1 x [tex]10^{-10}[/tex] M if the [[tex]H^{+}[/tex]] changed from [1 x [tex]10^{-7}[/tex]] to [1 x [tex]10^{-4}[/tex]] during the concentration change.
How do you determine H+ using pH?By “undoing” the common logarithm by exponentiating both sides with base 10 to obtain [[tex]H^{+}[/tex]] = 10pH.
How can I determine pH?You need to know the hydronium ion concentration in moles per litre to determine the pH of an aqueous solution (molarity). The formula pH = - log is then used to get the pH. [H3O+].
Concentration of [tex]H^{+}[/tex] ions = [[tex]H^{+}[/tex]] = 1 x [tex]10^{-7}[/tex]
When concentration of [[tex]H^{+}[/tex]] ions changed to 1 x [tex]10^{-4}[/tex] M
[[tex]H^{+}[/tex]] = 1 x [tex]10^{-4}[/tex] M
The pH of the solution will further change to:
pH = -log [[tex]H^{+}[/tex]]' = -log [1 x [tex]10^{-4}[/tex]] = 4
pH + pOH = 14
pOH = 14 - 4 = 10
And we know that:
pOH = -log [[tex]OH^{-}[/tex]]
10 = -log [[tex]OH^{-}[/tex]]
[[tex]OH^{-}[/tex]] = 1 x [tex]10^{-10}[/tex] M
Important IdeasIf the pH of the solution is known, it is possible to compute the hydrogen ion concentration in a solution, [H+], in mol L-1.
The negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 is used to calculate pH. pH equals -log10[H+]
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Find the concentration of sulfuric acid in mol/dm3 and g/dm3 given
that 25.0 cm3 of this solution reacts with 26.5 cm3 0.100 mol/dm3
sodium hydroxide solution in a titration
H2SO4 + 2NaOH → Na2SO4 + 2H2O
The concentration of sulfuric acid in mol/dm3 and g/dm3 would be 5.194 and 0.053 respectively.
Stoichiometric problemFrom the equation of the reaction, the mole ratio of the concentrated sulfuric acid and sodium hydroxide solution is 1:2.
Recall that: mole = molarity x volume
For 26.5 cm3 0.100 mol/dm3 sodium hydroxide solution, the number of moles of the solute in the solution can be calculated as:
26.5/1000 x 0.100 = 0.00265 moles
The equivalent number of moles of the concentrated sulfuric acid will be:
0.00265/2 = 0.001325 moles
Also, recall that:
Concentration in g/dm3 = mass/volume
concentration in mol/dm3 = mole/volume
For 0.001325, 25.0 cm3 sulfuric acid:
mass = 0.001325 x 98 = 0.12985 g
Concentration in g/dm3 = 0.012985/0.025
= 5.194 g/dm3
Concentration in mole/dm3 = 0.001325/0.025
= 0.053 mol/dm3
Hence, the concentration of the sulfuric acid in mol/dm3 and g/dm3 would be 5.194 and 0.053 respectively.
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use le châtelier's principle to predict how the equilibrium for the weak base methylamine responds to the indicated changes. ch3nh2(aq) h2o(l)↽−−⇀ch3nh 3(aq) oh−(aq) δH∘rxn
In the given reaction chemical equilibrium;
adding KOH will equilibrium to the leftIncreasing the temperature will shift the equilibrium to the rightWhat is the statement of Le Chatelier's principle?Le Chatelier's principle states that for a chemical system in equilibrium if an external constraint is applied o the system, the equilibrium position will shift so as to annul the effect of the constraint applied to the system.
In practical terms, this principle implies that if the forward reaction of a system in equilibrium is endothermic and the backward reaction is exothermic, adding more heat to the system will shift the equilibrium position of the reaction to favor the forward reaction.
Considering the given chemical equilibrium, the forward reaction is endothermic and results in the formation of OH⁻ ions.
Therefore, the addition of more OH⁻ will shift the equilibrium to the left whereas, the addition of heat will shift the equilibrium to the right.
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Complete question:
Use Le Châtelier's principle to predict how the equilibrium for the weak base methylamine responds to the indicated changes.
CH₃NH₂ (aq) H₂O (l) ⇄ CH₃NH₃⁺ (aq) + OH⁻ (aq) ΔH°rxn = 103 kJ/mol
1) adding KOH
2) Increasing the temperature
Which type of reaction is Mg + 2NaF --> MgF2 + 2Na?
Combination
Single Replacement
Double Replacement
Decomposition
Combustion
The reaction Mg + 2 NaF --> MgF₂ + 2Na is a single replacement reaction; option B.
What is a chemical reaction?A chemial reaction is a srecation in which atoms of elements under chemical changes to form new products.
The various types of chemical reactions include:
CombinationSingle ReplacementDouble ReplacementDecompositionCombustionA single replacement reaction is a reaction in which a single atom or a radical replaces another atom or radical in a compouds.
For example, the reaction given below is a single replacement reaction:
Mg + 2 NaF --> MgF₂ + 2NaMg replaces N ain the compound NaF.
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if you gently shake a separatory funnel containing a carboxylic acid with ethyl acetate and aq nahco3, the organic acid will be found where? (multiple answers possible)
The organic compound, carboxylic acid will be found in ethyl acetate.
What are organic compounds?Organic compounds are those compounds that are obtained naturally from living matter.
Organic compounds are mostly composed of carbon, hydrogen, and oxygen.
Organic compounds are generally covalent compounds. Hence, they are usually non-polar compounds.
Based on the principle of like dissolves like, organic compounds are usually soluble in non-polar organic solvents and insoluble in polar inorganic solvents like water.
Carboxylic acid is an organic compound.
Ethyl acetate is an organic compound.
Aqueous NaHCO₃ is an inorganic compound.
Hence, carboxylic acid will dissolve in Ethyl acetate.
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in a 1.0 l container at high temperature, 0.20 mol n2 and 0.15 mol o2 are allowed to react. set up the expression for qc. each reaction participant must be represented by one title. do not combine like terms
The concentration of NO is obtained as 3.5 * 10^-3 M.
What is the value of NO?We can see from the question that the equation of the reaction has been give. We need to recall that the equilibrium constant shows us the extent to which the reactants have been converted into products.
The more the conversion of the reactants to products, the larger the magnitude of the equilibrium constant. We can now use the values as we have them to find [NO]
If Kc = 4.10 * 10^-4
4.10 * 10^-4 = [NO]^2/[[tex]N_{2}[/tex]] [[tex]O_{2}[/tex]]
[NO] = √4.10 * 10^-4 * 0.2 * 0.15
[NO] = 3.5 * 10^-3 M
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H. Determine which of the following electron configurations are not valid: State which
rule has been violated.
16)
17)
1s 2s 2p 3s 3p 4s²4d0 4p³
1s 2s 2p 3s³3d³
18) [Ra] 7s²5f
19) [Kr] 5s 4d05p³
20) (Xe
19) [Kr] 5s 4d05p³ is the electron configuration that is not valid and in which the configuration rule has been violated amongst all the options
What is Electronic Configuration?In both the cases of atomic physics and quantum chemistry, this term electron configuration talks about the distribution of electrons of an atom or molecule in any atomic or molecular orbitals.
What is the formula for electron configuration?The formula for it is [tex]2n^2[/tex], where n is the shell number. The tables below list the shells, n values, and the total number of electrons that can fit.
What is the electron rule of 2 8 8?More than eight electrons can fit into the shell one inside the outermost shell in transition metals. Consider argon (Ar).
Its 18 electrons are arranged in a 2-8-8 pattern. Scandium (Sc) contains 21 electrons and is only 3 places away, however its configuration is 2-8-9-2.
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An experiment was designed to test the hypothesis that peanuts have more energy than a chip. The experiment determines calorimetry of the peanut and the chip, using water to capture the energy of the samples when they were burned. A 10 g sample of each type of food was burned underneath a metal can that held 50 g of water. A thermometer captured how much the temperature of the water increased. The water increased by 7 degrees for the peanut and 3 degrees for the chip. What conclusion can be drawn?
The chip has more energy than the peanut.
The peanut has more energy than the chip.
The experiment was flawed because more than one variable was being tested.
The peanut and the chip have the same amount of energy.
Since the water increased by 7 degrees for the peanut and 3 degrees for the chip, the conclusion would be that the peanut has more energy than the chip.
CalorimetryCalorimetry is the science of measuring the quantity of energy, usually in the form of heat, that is released during a reaction.
In this case, the energy released by the peanut and the chip were measured using calorimetry. The energy released was captured by the water and helps raise the temperature of the water.
The more energy released by the substances, the more the temperature of the water is raised.
Thus, since the peanut raised the temperature of the water by 7 degrees while the chip was only able to raise it by just 3 degrees, one can effectively conclude that the peanut has more energy than the chip.
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Mass and weight
Answer only!
Weight Doesn't change with location. (will NOT change if you take an object to Mars).
weight DOES change with location. (will change if you take an object to the Moon.
Mass Is a measure of amount of Matter in an object. Is a measure of the pull of Gravity on an object.
Weight Is measured with a scale,
Mass Is measured with a triple beam balance.
Mass Is used to calculate Density.
What is triple beam balance?The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.
The triple beam balance is a typical instrument used to measure the mass of various objects. It consists of three beams, each of which is provided with a single sliding weight that has a size corresponding to the gradations of the notched scale on each beam..
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a scientist is testing if caffeine helps mice run games faster. 10 mice receive 10 mg and 10 get a fake dose, then try to solve the same maze and their time is measured while they do it. what are the following in this experiment
In the experiment in which a scientist is testing if caffeine helps mice run games faster;
the 10 mice are the subject of the experimentthe 10 mg caffeine dose is the independent variablethe 10 fake dose is the control variablethe speed of the mice is the dependent variableWhat is an experiment?
An experiment is a scientific test or study which is performed in order to prove or disprove a hypothesis.
Experiments can also be undertaken in order to further establish or improve upon already established.
Variables are those factors that are studied in an experiment.
In a scientific experiment, the following variables are present:
The independent variable - this is the variable that changes that occur in it produce a change in the variable under studyThe dependent variable - this is the variable that is under study that is affected by the independent variable.The control variable - this is the variable that is kept constant or unchanged.Learn more about experiments at: https://brainly.com/question/25303029
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If a wave has a frequency of 4.89 x 10^12 Hz, what is the wavelength?
Answer:
4,890,000,000,000
Explanation:
To convert out of scientific notation, you would take the beginning number and move the decimal to the right 12 spaces.
(keep in mind that if the twelve was negative you would move to the left 12 spaces)
Based on what you know about matter, select the statement
which is true.
A. All matter has mass, but does not
always take up space.
B. Everything around us is made up of
atoms.
C. Only solid matter takes up space.
Atoms are too small to have mass.
B
Matter is anything that can be touched physically. Everything in the universe (except energy) is made of matter, and, so, everything in the universe is made of atoms. An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons.
suppose a hydrogen atom in the ground state absorbs a 10.7 nm photon. how much kinetic energy will the emitted electron have when it is far away from the nucleus?
Answer: cheting is not alllowed is this homework or not
Explanation:
1. 86 g h2 is allowed to react with 9. 70 g n2, producing 1. 24 g nh3. Part a what is the theoretical yield in grams for this reaction under the given conditions?.
1.86 g H₂ is allowed to react with 9.70 g N₂ producing 1.24 g NH₃. the theoretical yield in grams for this reaction under given conditions is 10.54 g.
The balanced chemical equation is given by :
N₂ + 3H₂ ------> 2NH₃
it is clear from the reaction that :
1 mole of N₂ react with 3 moles of H₂ to produced 2 mole of NH₃.
the molar mass of compounds are :
H₂ = 2 g/mol
N₂ = 28 g/mol
NH₃ = 17 g/mol
3moles of H₂ × 1 g/mol= 6 g
1 mole of N₂ × 28 g/mol= 28 g
2 moles of 2NH₃ × 17 g/mol = 34 g
now we have to find out the limiting reagent :
28 g of N₂ react with 6 g of H₂ , 9.70 N₂ will react with how much mass of H₂
mass of H₂ = (9.70 g of N₂ × 6 g of H₂) / 28 g of N₂
= 2.07 g
but 2.07 g H₂ is not available , only 1.86 g are available .so, H₂ is a limiting reagent.
The theoretical yield in the given case:
mass of NH₃ = (1.86 g of H₂ × 34 g of NH₃ ) / 6 g of H₂
= 10.54 g
Thus, 1.86 g H₂ is allowed to react with 9.70 g N₂ producing 1.24 g NH₃. the theoretical yield in grams for this reaction under given conditions is 10.54 g.
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4(NO3)2
please explain, will give brainliest!!
_____________________________________________________________________________________________________________________
Sally is swimming 6 meters every 2 seconds. this increase in speed took 10 seconds. what is the acceleration during this second part of the race?
The acceleration for the second part of the race is 0.3m/s².
How to calculate acceleration?Acceleration is the amount by which a speed or velocity increases. The acceleration can be calculated by dividing the speed of the object by the time taken as follows:
Acceleration = speed/time
According to this question, Sally is swimming 6 meters every 2 seconds, however, this increase in speed took 10 seconds.
The speed Sally is swimming is 3m/s i.e. 6/2. Hence, the acceleration can be calculated as follows:
Acceleration = 3m/s ÷ 10s
Acceleration = 0.3m/s²
Therefore, 0.3m/s² is the acceleration for the second part of the race.
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Bobby is at a family reunion and
would like to know what the median
age is, of everyone present. Here
are the ages of everyone at his
reunion:
35, 2, 7, 33, 25, 70, 75, 40, 42, 12,
15, 7, 44, 20, 25, 3, 65, 62
What is the median?
Answer:
Median is 29.
Explanation:
add all them up and divide them
1. 547 grams of hydrated mgso4 is heated in a crucible. After heating, 0. 7554 grams of anhydrous mgso4 remains in the crucible. How many waters of hydration were attached to the mgso4?.
7 waters of hydration were attached to the MgSO4.
1. 547 grams of hydrated mgso4 is heated in a crucible.
molecular weight of mgso4= 120 g/mol
let, x number of water molecule present in this hydrated mgso4
then, molecular weight = 18x +120.
MgSO4.X(H2O)-------> MgSO4 +X( H2O)
IF , n mole of hydrated mgso4 taken in the reactant side then , n mole of
anhydrous MgSO4 produce according to reaction.
n= 1. 547 /18x +120;
which is equal to mole of anhydrous MgSO4 that is
n= 0. 7554 /120;
by equating both equations
we get ,
0. 7554 /120 = 1. 547 /18x +120;
x= 7 (nearly.)
hence, 7 waters of hydration were attached to the MgSO4.
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What types of atoms and bonds are in the molecule shown below?
H₁
H
H
C=C
C-H
\H
Н
H
OA. Carbon, hydrogen, oxygen, and only single bonds
OB. Carbon, hydrogen, and only double bonds
C. Carbon, and only single bonds
OD. Carbon, hydrogen, single bonds, and double bonds
functional group: an atom, or group of atoms (with specific connectivity), exhibiting ... contain only carbon-carbon and carbon-hydrogen single bonds.
What do you call a molecule with only H and C atoms?Organic Molecules: The study of the characteristics of carbon-based compounds is known as organic chemistry. Except for a few inorganic carbon molecules, all carbon compounds are organic. The carbon oxides, metal ion bicarbonates and carbonates, metal cyanides, and a few more substances are examples of inorganic carbon compounds.
Hydrocarbons:Only carbon and hydrogen atoms make up the simplest organic molecules. Hydrocarbons are pure carbon and hydrogen compounds.
Alkanes: Methane, or CH4, is the most basic hydrocarbon. This is the most basic hydrocarbon in a group. The carbon atom count in each subsequent member of the series is one more than in the one before it. Alkanes are this group of chemicals (CnH2n+2). The less dense ones are utilised as fuels and are gases. the centre ones
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please help me i need it tomorrow
Answer:
Wave length
Explanation:
Is the distance between each wave of and wider it is apart the less energy the wavelength contains.
It is 21,000 kilometers around the earth and the earth rotates in 24 hrs. How fast is it rotating
It is 21,000 kilometers around the earth and the earth rotates in 24 hr then 875 km/hrs fast is it rotating
Earth spins on its axis and earth takes one day one rotation on its axis
It is 21,000 kilometers around the earth rotates in 24 hrs and we have to find how many km/hr earth rotating = ?
So, distance = 21,000km
Time = 24 hrs
Speed = 21,000km/24 hrs
= 875 km/hrs
875 km/hrs fast is it rotating
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Can someone do questions, 1, 2 and 3 if possible please?
Mass of magnesium ribbon is 0.21 g.
Mass of oxygen gas reacts with magnesium is 0.11 g
Number of moles of magnesium is 0.00875
Number of moles of oxygen is 0.0068.
Ratio of moles of magnesium and oxygen = 1.2 : 1
The number of moles of a substance equals the ratio of its given mass in a chemical reaction to the mass of one mole of that substance. One mole of any substance equals Avogadro's number, that is, 6.023 × 10²³.
we know that mass of crucible and lid = 35.56 g
mass of crucible and lid and magnesium = 35.77 g
Thus mass of magnesium = 35.77 - 35.56 = 0.21 g
mass of crucible and lid and magnesium oxide = 35.88 g
thus, mass of oxygen = 35.88 - 35.77 = 0.11 g
Now, Number of moles of magnesium = 0.21/24 = 0.00875
Number of moles of Oxygen = 0.11/16 = 0.0068
Ratio of Number of moles of magnesium to Number of moles of Oxygen = 0.00875/0.0068 = 1.2 : 1.
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Forsythia is __________, which is a type of a plant that loses its leaves each year.
A)
a savanna tree
B)
a winter tree
C)
a tropical tree
D)
perenial
E)
deciduous
Answer: The answer would be deciduous (answer E)
Explanation: A deciduous is a term which means “ Tending to fall off” or “falling off at maturity” in reference to trees and shrubs that seasonally shed leaves, usually in autumn (fall); to the shedding of petals, after flowering; and to the shedding of ripe fruit!
Answer:
Deciduous
Explanation:
The word deciduous has answer in itselfIt refers to a plant reaching its maturity of growth then tends to fall down Forsythia is such type of plant that follows deciduous manner and loses its leaves every year ,the leaves regain tooThe half-life of radium-226 is 1600 years. What fraction remains after 3200 years?
The leftover sample will be cut in half again.
4000 atoms⋅1/2=2000 atoms
after 3200 years
As a result, your initial sample of radium-226 will be reduced to 2000 atoms.
What is radium-226's half-life in years?Radium is created by the radioactive decay of uranium. Radiation intensity from radioactive materials reduces with time. The half-life is the time necessary for the intensity to diminish by one-half. Radium has a half-life of around 1,600 years.
Gamma radiation has the most energy of any kind of radioactive decay. Gamma radiation contains the greatest energy waves in the electromagnetic spectrum.
Radium is presently utilised to make radon, a radioactive gas that is used to cure some forms of cancer.
The historically significant transition of radium 226 into radon 222 by alpha particle emission is an example of alpha decay.
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what is a differentiate solution, colloid, suspension?
Answer:
Between genuine solutions and suspensions, colloids solutions and suspensions represent a middle ground. The colloid solution's solvent-dispersed particles' diameters range from 10 to 2000 A. Milk and butter are examples
In a ______ reaction, an atom replaces or switches with another atom or part of a compound
List 6 characteristics that separate compounds from mixtures:
Answer:
Listed below
Explanation:
COMPOUND
1. It is a pure substance.
2. It can not be separated by a physical method.
3. Element loses their properties in a compound.
4. Its composition is fixed throughout its mass.
5. It has a fixed melting point.
6.In nature they are homogeneous.
MIXTURE
1. It is an impure substance.
2. It can be separated by a physical method.
3. Substances forming mixture retain their properties.
4. It has no fixed composition.
5. It has no sharp melting point.
6. They can be homogeneous as well as heterogeneous in nature.
while starting a car, a lead acid battery converts 0.63 grams of pb (207.2 g/mol) at the anode into pbso4. if a current of 0.140 a is used to recharge the battery, how long will recharge take?
Based on the number of electrons required and the strength of the electric current, we can calculate that the time needed to recharge the battery will be 1 hour, 9 minutes, and 23 seconds.
First, we calculate the number of moles of lead oxidized to lead(II) sulfate.
n = m/M = 0.63 g / 207.2 g/mol = 0.00304 mol
Then, we calculate the number of electrons needed to reduce this amount of lead(II) back into the elemental lead (each lead(II) ion requires two electrons):
[tex]N = 2 electrons * 0.00304 mol * 6.02 *10^{23} mol^{-1} = 36.6 * 10^{20} electrons[/tex]
Now that we know the number of electrons required, we can divide that amount by the strength of the electric current used to calculate the time required to recharge the battery:
[tex]t = N / I = 36.6*10^{20} electrons / 0.140 A = 36.6*10^{20} electrons / 0.140 * (6.28*10^{18} electrons/s) = 4163 s[/tex]
Because 1 hour has 3600 seconds, and a minute has 60 s, the time required will be 1 hour, 9 minutes, and 23 seconds.
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What can engineers do to lower impact forces?
O Increase the collision duration
O Decrease the velocity of an object
O Decrease the mass of an object
O All of the Above
Engineers do to lower impact forces by increasing the collision duration.
What is meant by collision?Any time two objects collide, a collision occurs. Conservation of momentum and conservation of energy are typically used to resolve collision-related problems.
Collisions can occur in two ways:
Momentum is conserved during inelastic collisions, while momentum and kinetic energy are both preserved during elastic collisions.Completely inelastic collisions, in which the impacted objects stick together, are the simplest to analyze. The conservation of momentum allows us to determine that the two objects have the same final velocity.In elastic collisions, no energy is wasted to other forms and is entirely retained as kinetic energy. It follows that momentum and kinetic energy are both preserved.
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A student is 159cm tall and weighs45.8kg what is the height in inches and weight in pounds ?
Height in inches is 62.6 inches and weight in pounds are 101 pounds
Height is a way to measure someone or something from base to top or head to toe
Here given data is student height = 159cm tall and weight is = 45.8kg
So we have to convert
Height in cm = height in inches
Weight in kg = weight in pounds
So, 1 inches = 2.45cm
Height = 159cm×1 inches/ 2.45cm
Height = 62.6inches
Now, 1kg = 2.2045 pounds
Weight = 45.8kg×2.2045 pounds/1kg
Weight = 101 pounds or lbs
Height = 62.6inches and weight = 101 pounds or lbs
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but mainly the Moon because the Moon is..
1. closer
2. larger
3. denser
two high tides and two low tides make...time period
1. 12-hour
2. 16-hour
3. 24-hour
Moon creates...on two opposite sides
1. tidal bulges
2. moon phases
3. orbits
Moon and sun are oriented...which gravitationally pulls water
1. in a straight line
2. at a right angle measuring 90 degrees
3. at an acute angle measuring 23 angles
1. closer
2. 24-hour
3. tidal bulges
4. at a right angle
Explanation:
Not sure bout the last one but hope it helps