The number of atoms present in the sample is 2.163 x 10²² atoms.
The mass of the sample is 0.25 g.
number of atoms present in the sampleThe number of atoms present in the sample is calculated as follows;
E = nhf
where
n is the number of atoms in the sampleh is Planck's constantf is frequency of the atomE is the total energy emittedn = E/hf
n = (8600) / (6.626 x 10⁻³⁴ x 6 x 10¹⁴)
n = 2.163 x 10²² atoms
Mass of the sample6.02 x 10²³ atoms of Lithium = 6.9 g
2.163 x 10²² atoms = ?
= (2.163 x 10²² atoms x 6.9 g) /(6.02 x 10²³ atoms )
= 0.25 g.
Thus, the number of atoms present in the sample is 2.163 x 10²² atoms. The mass of the sample is 0.25 g.
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please help me I need to know these answers rn A, B, OR C to each one
Answer:
First one
Explanation:
Because water molecules at the surface of the water puddle attract more to one other than they do to the air molecules above them
Answer:
Question 2:
Cohesion and adhesion
Water has forces of attraction between different molecules, so its molecules are locomotive.
Question 3:
Surface tension
It experiences a perpendicular force which keeps the area of the pepper on surface
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Help, please!! Been stuck on this question. Is it only neutral?
Answer:
neutral
Explanation:
.....................
If an automobile air bag has a volume of 11.6 ll , what mass of nan3nan3 (in gg ) is required to fully inflate the air bag upon impact? assume stp conditions.
22.3 g of NaN₃ are required to fully inflate an airbag of 11.6 L at STP.
To find the mass, the given data was,
Volume = 11.6 Liters
What is decomposition reaction?A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
In airbags, sodium azide decomposes to form sodium and nitrogen gas, which inflates the bag. The decomposition reaction is:
2 NaN₃ ⇒ 2 Na + 3 N₂
We can calculate the mass of NaN₃ needed to produce 11.6 L of N₂ at STP, using the following relations.
At STP, 1 mole of N₂ occupies 22.4 L.The molar ratio of N₂ to NaN₃ is 3:2.The molar mass of NaN₃ is 65.01 g/mol.Substituting all the known values to find the volume,
11.6 × ( 1 / 22.4) × ( 2/3) × ( 65.01 / 1)
= 22.4 g.
22.4 g of NaN₃ are required to fully inflate an airbag of 11.6 L at STP.
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Giving away 100 points Fast
What type of mixture is a solution?
Choose All the right answers
homogeneous mixture
all of the choices
none of the choices
heterogeneous mixture
Answer:
Homogeneous mixtures
Explanation:
This is because the substances are fully mixed together
The phenomenon of waves changing direction as they approach the shoreline is known as ________.
The phenomenon of waves changing direction as they approach the shoreline is known as Wave refraction.
What is wave refraction?Refraction is the change in direction of waves as they move between materials with different properties. In Physics, when the speed changes the direction of wave passes from one medium to the another medium.Like wise, Water waves are refracted as they move from deep water to shallow water. Water waves travel faster in deep water than in shallow water.The wave refraction gets the changes in direction as it slows down because of reaching the shore line. In shallower water near the coast, waves slow down because of the force exerted on them by the seabed.
And the phenomenon of waves changing in the direction as they approach the shoreline is known as Wave refraction.
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A radioactive element has a half life of 10 days how many days would it take for 1000 grams of it to decay to 125 grams
A radioactive element has a half life of 10 days then there are 7 days would it take for 1000 grams of it to decay to 125 grams .
Calculation ,
radioactive element has a half life = 10 days ( given )
Kt = 0.069
K = 0.069 / t
K = 0.069 / 10 days = 0.0069
Kt = ㏑a/a-x
where ,
a = concentration of radioactive element at time 0 = 1000 grams
a-x = concentration of radioactive element at time t = 125 grams
Putting the value of a , a- x and K in equation ( i ) we get ,
0.0069 × t = ㏑1000 grams/125 grams = ㏑8 = 2.07
t= 2.07 / 0.0069 = 7 .05 days or 7 days
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I need help asap! It’s the scale model of the solar system project on science.
A scale model of the solar system can be defined as the small representation of the real solar system. A scale model mimics the real solar system with the sun at the center and nine planets revolving around the sun.
What benefits can scale models have for those studying the solar system?
Using this scale model, it is possible to comprehend space distances, the sizes of the planets and the sun in relation to one another, space travel periods, and the separation of the planets from one another as they orbit the sun.
What is Astronomical Unit(A.U.)?Approximately 93 million miles or 150 million kilometers between Earth and the Sun. The Astronomical Unit (A.U.) is the name given to this distance because it is so significant to humans living on Earth. One astronomical unit separates the Earth from the Sun.
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A+gaseous+mixture+of+o2+and+n2+contains+38.8+%+nitrogen+by+mass.+what+is+the+partial+pressure+of+oxygen+in+the+mixture+if+the+total+pressure+is+465+mmhg+?
A gaseous mixture of O₂ and N₂ that contains 38.8% nitrogen by mass, with the total pressure of 465 mmHg, has a partial pressure of oxygen of 270 mmHg.
The total pressure of an ideal gas mixture is the sum of the partial pressures of the gases in the mixture.
total pressure = 465 mmHg
m(N₂) = 38.8 g; mass of the nitrogen
n(N₂) = m(N₂) ÷ M(N₂)
n(N₂) = 38.8 g ÷ 28 g/mol
n(N₂) = 1.385 mol; amount og nitrogen gas
m(O₂) = 61.2 g; mass of oxygen gas
n(O₂) = m(O₂) ÷ M(O₂)
n(O₂) = 61.2 g ÷ 32 g/mol.
n(O₂) = 1.9125 mol; amount of oxygen gas
Using Dalton's law:
p(O₂) = (1.912 mol / 1.912 mol + 1.385 mol) × 465 mmHg
p(O₂) = 270 mmHg; pressure of the oxygen gas
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The number 6 that he put in from of the O2, CO2, and H2O is called a:
superscript
coefficient
subscript
The number 6 that he put in from of the [tex]O_{2}[/tex] , [tex]CO_{2}[/tex] , and [tex]H_{2} O[/tex] is called a coefficient .
So , second option is correct one .
In chemistry, coefficient is a number used in chemical equations, simply as a prefix of chemical formula to define the number of molecules reacting and creating in a reaction. This is similar to how in mathematics, coefficient is the number used in front of a variable.
When dealing with concentration terms in a chemical equation, coefficients are crucial to the equation's stability. In order to ensure that the law of conservation of mass is being obeyed, we add coefficients to the equation to make it balanced.
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What is the force used with a centrifuge to rapidly separate the precipitate from the liquid?.
Centrifugal force (centripetal acceleration) is used with a centrifuge to rapidly separate the precipitate from the liquid.
What is a centrifuge?
According to particle size and density, medium viscosity, and rotor speed, particles suspended in a liquid are separated using a centrifuge. Gravitational forces within a solution cause particles with densities greater than the solvent to sink and those with densities less than the solvent to float to the top.
Using the centrifugal force to separate particles found in a solution, centrifugation is a mechanical technique for separation. Depending on the size, shape, density, and rotor speed of the particles, different groups are created.
Thus, A centrifuge is used to quickly separate the precipitate from the liquid using centrifugal force (centripetal acceleration).
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Cscl has a crystal stucture where each cl- ion is surrounded by 8 cs+ ions. derive the minimum r/r ration drequired for stability for the general case of cn=8
Cscl has a crystal stucture where each cl- ion is surrounded by 8 cs+ ions.
Caesium (Cs+) and chloride (Cl-) ions make up an equal amount of the crystals in caesium chloride. Two ions' radii—169 pm for Cs+ and 181 pm for Cl-—led to a radius ratio of 0.93, which suggests a body-centered cubic structure with a cubic hole.
The minimal ratio is 169/181 = 0.93 for rCs+/rCl-.
What is CsCl structure?
The physical makeup of calcium chloride, abbreviated CsCl. An unending chain of ions makes up the cubic structure of csCl. The cube's eight corners contain Cs (or Cl) ions, while the cube's centre contains Cl (or Cs) ions (thus it is NOT a body-centered lattice since that requires the SAME ion to occupy the edges and center).
Caesium (Cs+) and chloride (Cl-) ions make up an equal amount of the crystals in caesium chloride. Two ions' radii—169 pm for Cs+ and 181 pm for Cl-—led to a radius ratio of 0.93, which suggests a body-centered cubic structure with a cubic hole.
Thus the minimal ratio is 169/181 = 0.93 for rCs+/rCl-.
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One reason that explains the need for the isomerization step in the citric acid cycle is that _
One reason that explains the need for the isomerization step in the citric acid cycle is that citrate is a tertiary alcohol, which cannot be oxidized.
Citric acid cycle is the main source of energy for a living organism.
Citrate is isomerized to isocitrate by dehydration and rehydration. The enzyme aconitase catalyzes this step (see picture below).
Tertiary carbon (3°) withy hydroxyl group (-OH) is attached to three other carbons.
Tertiary carbon cannot be oxidized, while secondary carbon in isocitrate can. Isocitrate is secondary alcohol.
Secondary carbon (2°) is attached to two other carbons.
Primary carbon (1°) is attached to only one carbon.
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Abnormal levels of _________ are linked to migraines, seizures, and schizophrenia. a. dopamine b. glutamate c. norepinephrine d. acetycholine please select the best answer from the choices provided a b c d
Answer:
b. glutamate
Explanation:
Curtis wanted to measure the volume of a rock using the method shown above. Which of the
following Sl units should he use?
A. grams
B. meters
C. milliliters
D. kilometers
Answer:
A. grams
Explanation:
Grams and milliliters are used to measure mass while meters and kilometers are used to measure distance. The mass of an object is the volume of it. Milliliters are used for liquids while grams are used for solids. Hence, grams is the answer.
When an ionic compound is added to water, the will be attracted to the partially positive h atom of water and the will be attracted to the partially negative o atom of water. As the compound dissolves the ions separate from each other, or.
Answer:
Ionic compounds dissolve in water because the water molecules hydrate the ions.
Explanation:
To dissolve an ionic compound, the water molecules must be able to stabilize the ions that result from breaking the ionic bond.
They do this by hydrating the ions.
Water is a polar molecule. It has a permanent dipole.
The
O
atom has a partial negative charge, and the
H
atoms have a partial positive charge.
When an ionic compound is added to water, the anion is attracted to partially positive hydrogen atom of water and cation is attracted to partially negative oxygen atom of water.
What is an ionic compound?Ionic compound or electrovalent compound is a type of compound which is formed between the two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.
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CHz+ O2-> CO+H2O
Mrs. Jones asked her class to come up with 3 true statements about the chemical equation shown above.
Jenny said that the reactants in the equation were CH₂ and O2 and the products were CO + H₂O.
• Jeffery said that there were 2 atoms of oxygen (O) on the reactants side and 2 atoms of oxygen on the products
. Lisa said the chemical bonds of the reactants were broken to produce one molecule of water (H₂O) and one mo
Who was correct?
All three students were correct.
Jeffery is the only one who is correct since he counted the atoms.
None of the students are correct
Only Jenny and Jeffery are correct since chemical bonds were broken on the products side too. / HELP PLEASE
All three students are correct,
CH₂+ O₂-> CO+H₂O is combustion reaction
What is a chemical reaction?
A process in which one or more substances also called reactants, are converted to one or more different substances, known as products.yes, Jenny's statement is correct. Both CH₂ and O2 are reactants and CO + H₂O are products.⇒ Reactants - The substances that go into a chemical reaction
⇒ Products - The substances produced at the end of the reaction
Jeffery's statement is also correct. Reactant side has O₂ which has 2 a oxygen atoms while product side has H₂O and CO, both have 1 oxygen in each making a total of 2 oxygen atoms on product side.Lisa's statement is also correct. In a chemical reaction bonds are broken within reactant molecules and new bonds are formed within product molecules in order to form a new substance ( here H₂O and CO )Thus we can conclude that all three students were correct.
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What is the density of an object that weighs 30.73 g that when added to a graduated cylinder filled with 50.0 ml of water, if the final volume is 60.7 ml?
The density of the object that weighs 30.73 g is: 2.87 g/ml
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
m = 30.73 gv1 = 50.0 mlv2= 60.7 mlv(total)=?d=?Calculating the total volume we get:
v(total)= v2 - v1
v(total)= 60.7 ml - 50.0 ml
v(total)= 10.7 ml
Applying the density formula, we get:
d = m/v
d = 30.73 g/ 10.7 ml
d = 2.87 g/ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Enter the masses of these particles in kilograms. Express the masses of proton and neutron to six significant figures. Express the mass of electron to two significant figures. Enter your answers in kilograms.
The masses of proton ( in kilogram) = 1.67262 × 10−27 kg ( six significant figure).
The masses of neutron ( in kilogram) = 1.67493 × 10−27 kg (six significant figure)The masses of electron ( in kilogram) = 9.1× 10−31 kg (two significant figure)Proton is a stable subatomic particle with symbols p, H+ or 1H+ and a positive charge of +1 e elementary charge. Its mass is slightly less than that of a neutron.
A neutron is a subatomic particle (symbol n or n⁰ ) with a neutral charge and a mass slightly greater than that of a proton. Protons and neutrons form the nucleus. Electrons, protons, and neutrons are the elementary particles that make up atoms. Atoms consist of a central nucleus containing neutrons and protons. Electrons revolve around the nucleus. Electrons are negatively charged, protons are positively charged, and neutrons are neutral. The electron mass is the mass of the rest electron, also known as the invariant mass of the electron.
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How many different signals would we expect in the 1h nmr spectrum of nicotinic acid? (give a number.)
four signals that expect in the 1H NMR spectrum.
What is the number of 1H NMR signals produced by each compound?There are four signals in the spectrum: triplet (0.7 ppm), multiplet (1.4 ppm), singlet (1.9 ppm), and triplet (2.2 ppm). Compounds, and should have four signals in the 1H NMR spectrum based on their structures. H NMR is the technique of choice for determining or confirming the structure of organic compounds or those containing protons. A solution-state proton spectrum is relatively fast to acquire when compared to other nuclei, and it can reveal a lot about the structure of a compound.Therefore, the four aromatic protons can be divided into three sets. The two methyl groups are equivalent. There are four signals in total in the 1H NMR spectrum.
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How is phosphorylation of glyceraldehyde 3-phosphate in the payment phase of glycolysis different from phosphorylation of glucose in the preparatory phase?
In the preparatory phase of glycolysis, two molecules of ATP are invested and the hexose chain is cleaved into two triose phosphates. During this, the phosphorylation of glucose and its conversion to glyceraldehyde-3-phosphate take place. During this phase, the conversion of glyceraldehyde-3-phosphate to pyruvate and the coupled formation of ATP take place. Because Glucose is split to yield two molecules of D-Glyceraldehyde-3-phosphate, each step in the payoff phase occurs twice per molecule of glucose.
Glyceraldehyde 3-phosphate dehydrogenase Simultaneous oxidation and phosphorylation of G3P produce 1,3-bisphosphoglycerate (1,3-BPG) and nicotine adenine dinucleotide (NADH).
The divalent cation also affected the response of the enzyme from the endosperm and shoots to adenine nucleotides and inorganic pyrophosphate.
This phase is also called the glucose activation phase. In the preparatory phase of glycolysis, two molecules of ATP are invested and the hexose chain is cleaved into two triose phosphates. During this, the phosphorylation of glucose and its conversion to glyceraldehyde-3-phosphate take place. Steps 1, 2, 3, 4, and 5 together are called the preparatory phase.
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What mass of oxygen is required to react with calcium to produce 44.8 g calcium oxide?
The mass of oxygen required to react with calcium to produce 44.8 g of calcium oxide is 12.79 grams.
The reaction between Calcium and Oxygen produces calcium oxide which is represented as
2Ca + O2 = 2CaO
According to the above reaction
1 mole of O2 produces 2 moles of CaO
Or 112 grams of CaO is produced by 32 grams of O2
1 gram of CaO is produced by 32/112 grams of O2
Hence 44.8 g of CaO is produced by 32/112 x 44.8 = 12.79 grams of O2
Therefore, the mass of oxygen required to react with calcium to produce 44.8 g of calcium oxide is 12.79 grams.
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What quantity of moles of glucose (c6h12o6) in 0.500 l of a 0.400 m l of a 0.400 m?
Quantity of moles of glucose is 0.2 mol.
V (glucose) = 0.500 l; volume of glucose solution
c (glucose) = 0.400 M; concentration of glucose solution
n (glucose) = c (glucose) × V (glucose)
n (glucose) = 0.400 mol/l × 0.500 l
n (glucose) = 0.2 mol; amount of glucose in the solution
Glucose is chemical compound composed of carbon, hydrogen and oxygen atoms connected with covalent bonds.
Volume is the amount of space that a substance occupies.
The mole is the unit of measurement for amount of substance, the mole is an SI base unit, with the unit symbol mol.
The concentration is the amount of solute that has been dissolved in a given amount solution.
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If 501 J of heat is available,
what is the mass in grams of
iron (specific heat = 0.450 J/g.
°C) that can be heated from
22.5°C to 120.0°C?
The mass of iron heated during temperature change is 11.42g
Given:
Temperature (denoted by ΔT) = Final temperature – Initial temperature = 120.0°C – 22.5°C = 97.5°C
Quantity of heat involved (denoted by q) = 501 Joules
Specific heat capacity of iron (denoted by C) = 0.45 J/g°C
To find:
Mass of iron (denoted by m) = ?
Formula:
C = q / (mΔT)
Calculation:
On substitution of the given values in the formula to find the mass of iron by first making mass of iron (m) as the subject of the formula
m = q / (CΔT)
m = 501 / (0.45 x 97.5)
m = 11.42g
Result:
The mass of iron heated during temperature change is found to be 11.42g
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What is the concentration of [h] in molars, millimolars, and micro-molars for a solution of ph 5?
The concentration of [H⁺] is 10⁻⁵ molar, 10⁻² millimolar and 10 micro-molar.
pH is a numeric scale used to specify the acidity or basicity of an aqueous solution.
pH = -log[H⁺], approximately the negative of the base 10 logarithm of the molar concentration of hydrogen ions.
When pH is less than seven (pH<7), solution is acidic (like this example).
pH = 5
[H⁺] = 10⁻⁵ M; concentration of hydrogen ions
Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10⁻³).
Micro (symbol µ) is a unit prefix in the metric system denoting a factor of one millionth (10⁻⁶).
[H⁺] = 10⁻⁵ × 10³ mM = 10⁻² mM
[H⁺] = 10⁻⁵ × 10⁶ µM = 10µM
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What is (are) the product(s) in this reaction?
Answer: A
Explanation:
The arrow points towards what the finishing product is when you combine them, So H2CO3 would be the product.
I'm not amazing at this because I learned it 2 years ago lol, but that's my best educated guess. I hope it works!!
WILL GIVE BRAINLIEST
A student measures the mass of a bag of sand to be 9,321 g. What is the bag's mass
in kg?
Answer: 9.321 kg
Explanation:
1,000 g=1 kg
9,321 g * 1 kg/1,000 g=
9,321 * 1/1,000=
9,321/1,000=9.321 kg
6. The function of the general adaptation syndrome (GAS) is to...
a) Return the body to a state of homeostasis.
b)
Enable the body to deal with increasing amounts of stress.
c) Increase the body's awareness of the stress response.
d) Change the body's response to stress.
Explanation:
C) increase body's awareness of the stress response
The function of the general adaptation syndrome (GAS) is to:
d) Change the body's response to stress.
The general adaptation syndrome (GAS) is a three-stage model that describes how the body responds to stress. The first stage is the alarm reaction, which is when the body releases hormones such as cortisol and adrenaline in response to a perceived threat. The second stage is the resistance stage, which is when the body tries to adapt to the stressor. The third stage is the exhaustion stage, which is when the body's resources are depleted and it can no longer cope with the stressor.
The function of GAS is to change the body's response to stress so that it can better cope with future stressors. This is done by increasing the production of stress hormones, such as cortisol, and by increasing the body's ability to use glucose for energy.
So the answer is (d) Change the body's response to stress.
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What+mass+of+nh3+is+required+to+produce+125+g+of+no2+if+the+percentage+yield+for+the+reaction+is+67.2%?+enter+your+answer+in+grams+and+without+units.
The mass of ammonia is 68.74 grams.
Balanced chemical equation for reaction of ammonia and oxygen:
4NH₃ + 7O₂ → 4NO₂ + 6H₂O
m(NO₂) = 125 g; the mass of nitrogen(IV) oxide
n(NO₂) = m(NO₂) ÷ M(NO₂)
n(NO₂) = 125 g ÷ 46 g/mol
n(NO₂) = 2.72 mol; amount of nitrogen(IV) oxide
From the chemical equation: n(NO₂) : n(NH₃) = 1 : 1
n(NH₃) = 2.72 mol
the percentage yield = 67.2% ÷ 100%
the percentage yield = 0.672
m(NH₃) = n(NH₃) × M(NH₃) ÷ the percentage yield
m(NH₃) = 2.72 mol × 17 g/mol ÷ 0.672
m(NH₃) = 68.74 g; mass of ammonia
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What is the ph of a solution prepared by diluting 25.0 ml of 0.10 m hcl with enough water to produce a total volume of 100.0 ml?
The pH of a solution is 1.60.
Chemical dissotiation of hydrochloric acid:
HCl(aq) → H⁺(aq) + Cl⁻(aq)
c₁(HCl) = 0.10 M; original concentration of the solution of hydrochloric acid (HCl) before it gets diluted
V₁(HCL) = 25.0 ml; the volume of HCl to be diluted
V₂(HCl) = 100.0 ml; final volume of HCl after dilution.
c₂(HCl) = ?; final concentration of the solution of HCl, after dilution
c₁ · V₁ = c₂ · V₂; formula to calculate concentration of a solution
c₂(HCl) = c₁ · V₁ ÷ V₂.
c₂(HCl) = 0.10 M · 25.0 ml ÷ 100 ml
c₂(HCl) = 0.025 M
From chemical reactio: c₂(HCl) = c(H⁺)
c(H⁺) = 0.025 M; concentration of hydrogen ions
pH = -logc(H⁺)
pH = 1.60
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What is the difference between a suspension and a solution?
a. A suspension is more concentrated than a solution.
b. A suspension is less concetrated than a solution
c. A suspension is heterogeneous while a solution is homogeneous
d. A suspension is homogeneous while a solution is heterogeneous.
plss answer correctly
Answer:
C
Explanation:
Solutions are mixtures that are homogeneous while suspensions are mixtures that are heterogeneous.
