The fraction of 12c in the sample is 60% or 0.6
What are Isoptes?Isotopes are two or more different atom types that share the same atomic number and are placed in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers. Or, any of two or more types of atoms of a chemical element that have the same atomic number and essentially the same chemical behavior, but have distinct atomic masses or mass numbers and different physical properties. Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, with respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.
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6. the molecular weight of potassium chloride (kcl) is 74.55 g/mol. how many grams would you need for 650 ml of a 35 mm solution?
Mass of potassium chloride (KCl) is 1.7 grams.
M(KCl) = 74.55 g/mol; molar mass of potassium chloride
V(KCl) = 650 ml = 0.65 l; volume of potassium chloride solution
c(KCl) = 35 mM = 0.035 M; concentration of potassium chloride solution
m(KCl) = c(KCl) × V(KCl) × M(KCl)
m(KCl) = 0.035 M × 0.65 l × 74.55 g/mol
m(KCl) = 1.7 g; mass of potassium chloride
Potassium chloride (KCl) is a salt with ionic bond.
Molecular weight is the sum of the atomic weight values of the atoms in a molecule.
The concentration is the amount of solute that has been dissolved in a given amount solution.
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Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, glucose would move
Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, there would be no net movement of glucose
The given declaration is wrong. Glucose answers aren't electrolytes and consequently do now no longer behavior power. Is sodium chloride an awesome conductor of power? Simply with the aid of using dissolving or dissolving it in water, it can not behavior power as a solid.
Saline includes Na+ and Cl- ions. If ions are gifted withinside the answer, those ions can pass thru the answer and convey an electric-powered current. Pure water and sugar answers do now no longer include widespread ions. glucose molecules do now no longer smash down into ions whilst dissolved.
When glucose is introduced to water, it dissolves without difficulty however now no longer dissociates into ions. Therefore, a glucose answer isn't an electrolyte and isn't a conductor of power.
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Write a net ionic equation for the overall reaction that occurs when aqueous solutions of carbonic acid and potassium hydroxide are combined. assume excess base.
The net ionic equation for the overall reaction that occurs when aqueous solutions of carbonic acid and potassium hydroxide are combined is:-
H₂CO₃ + KOH ⇒ K₂CO₃ + H₂O
The reaction between an acid and base is known as a neutralization reaction.
In a neutralization reaction, an acid and a base react to produce a salt and water along with it.
Here H₂CO₃ is a weak acid and KOH is a base.
We have been given the information that the base i.e. KOH is present in excess amount.
Thus, the reaction between H₂CO₃ and KOH is as follows:
H₂CO₃ + KOH ⇒ K₂CO₃ + H₂O
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Conclude Each
year,
the American Chemical
Society holds a national meeting and many
regional meetings for chemists. Reports of
these meetings are then circulated all over
the world Why do you think this has become
standard practice?
Someone please help
This has become common practice, in my opinion, since scientists need to exchange ideas.
I think this has become standard practice because scientists need to share their ideas.Generally, most scientists don't work individually. They cooperate and work in teams. In contrast, a team is more effective than a single person in solving a scientific puzzle.Additionally, when they discuss the meeting reports, it facilitates their ability to agree on the concepts presented.. Every idea is questioned. This accurate evaluation guarantees that scientific knowledge is solidly supported.Also, scientists have to be aware of the latest researches and ideas in their field.To learn more about American chemical society visit:
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write a short note on ehy group O elements do not involve in chemical reaction
I will mark as brainliest
Answer:
Inert (or noble) gases are stable and mostly non-reactive. They have a full outer shell of valence electrons which gives them little tendency to participate in chemical reactions.
Explanation:
What is the density of water at room temperature in g/ml? give just the number and not the unit.
The density of water at room temperature is 1.0 g/ml.
Density is defined as the mass per unit volume. It gives the denseness of a given substance in a specific space. Different substances have different densities.
The formula to calculate the density is:
ρ =m/v
where,
ρ is the density, m is the mass of the object and V is the volume of the object. The SI unit of density is kg/m³, but we use g/ml for our convenience.
For example, the density of water is 1000 kg/m3 but we convert it into 1.0 g/ml.
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Select the correct mass for each of the samples described below.
3.01 × 1023 molecules H2O
Answer:
Explanation:
To determine the mass of each compound, we need to convert them into units of moles first. We use avogadros number to do this and use the molar mass of the compounds to convert to mass.
3.01 × 1023 molecules H2O ( 1 mole / 6.022x10^23 kg) (18.02 g / 1 mole) = 9.01 g
8.32 × 1020 formula units CaBr2 ( 1 mole / 6.022x10^23 kg) (199.89 g / 1 mole) = 0.28 g
1.93 × 1026 molecules XeF6 ( 1 mole / 6.022x10^23 kg) (245.28 g / 1 mole) = 78610.16 g
Convert each of the measurements given to the new unit stated using the factor label method (dimensional analysis). show all work including rewriting the given.
two step conversions:
26 cm to ft. ______________
16 lb to g ______________
1 yr to s ______________
3.5 mi to km ______________
The conversion of each of the measurements given to the new unit stated using the factor label method is as follows:
26 cm to ft:1 Foot = 30.48 cm.
∴ 26 cm = 26/30.48 = 0.853 foot.
16 lb to g:1lb = 453.59 g.
16 lb = 453.59 × 16 = 7257.48 g.
1 yr to s:1 year = 365 days; 1 day = 24 hours; 1 hour = 60 minutes; 1 minute = 60 sec.
1 year = 365 × 24× 60× 60 = 31,536,000 seconds.
3.5 mi to km:1 mile = 1.60 km.
3.5 mile = 3.5 × 1.60 = 5.63 km.
What is the Factor label method?The factor label method may be defined as a type of technique that is significantly utilized in order to convert one unit of measurement into the other with the utilization of the conversion factor.
Therefore, the conversion of each of the measurements given to the new unit stated using the factor label method is well-described above.
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A student reported that their zinc layer was 18256793.61 atoms thick. what are three things wrong with reporting this number?
Three things wrong with reporting this number are fractional atom, scientific notation and unit of measurement .
1) Decimal fraction of 0.61 is wrong for number of atoms. For number of atoms, whole numbers must be used, not fractional. For example 1, 25 or 565
2) In example like this, large number should be displayed in scientific notation. It depands on the number of significant figures, but this number can be reported as 1.826x10⁸.
3) Number of atoms is not standard for measurement of thickness of the layer. It is better to us nm (nanometers) or some other unit for the lenght.
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A small airplane takes on 221 l of fuel. if the density of the fuel is 0.821 g/ml, what mass of fuel has the airplane taken on?
The mass of fuel the airplane taken on is 1.81 × 10⁵ g or 1.81 × 10² kg.
V(fuel) = 221 l
V(fuel) = 221 l × 1000 ml/l
V(fuel) = 221 000 ml = 2.21 × 10⁵ ml; volume of the fuel
d(fuel) = 0.821 g/ml; density of the fuel
m(fuel) = V(fuel) × V(fuel)
m(fuel) = 2.21 × 10⁵ ml × 0.821 g/ml
m(fuel) = 1.81 × 10⁵ g; mass of the fuel
m(fuel) = 1.81 × 10⁵ g × 10⁻³ kg/g
m(fuel) = 1.81 × 10² kg
Density is a measure of mass per unit of volume (in this example grams per milliliter).
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4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked
following questions to his teacher
a. Which tissue forms the outer covering of a plant and does it have a protective role
to play?How ?
b. Why does water not stick to the leaves?
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
What tissues protects the leaves?We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.
The tissue that plays this outer covering of a plant for is the epidermis and its waxy cuticle. It prevents damage to the plant.
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
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answer quick its time
Thomson concluded that _______ have ________ mass than the atom.
Electrons; less
Protons; less
Neutrons; less
Electrons; more
The great scientist Thomson concluded that electron have less mass then atom.
What is Thomson atomic model?Thomson atomic model was proposed by William Thomson. It was strongly supported by Sir Joseph Thomson who had discovered the electron earlier.
According to Thomson atomic model an atom is made up of positively charged sphere into which negatively electron are implanted. The magnitude of the negative and positive charges are same thus the atom is electrically neutral as whole.
Thomson atomic model can also be called as the plum pudding model.
Thus, the great scientist Thomson concluded that electron have less mass then atom.
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Use the chemical reaction to answer the question.
CaCO3→CO2+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3
) in the chemical reaction shown. What is the total mass of the products?
(1 point)
60 grams
15 grams
30 grams
10 grams
Answer:
Explanation: 15 grams trust me.!!
An amino acid consists of an amino group at one end and which group at the opposite end?
Answer:
Carboxylic acid group
Explanation:
Carboxylic acid and amine groups form the basis of an amino acid. One group reacts with the other group on a neighboring amino acid to form the peptide bond, with the release of a water molecule.
Place the following compounds in order of increasing boiling point. ch3cl, n2, ch3ch2nh2
The order of increasing boiling points of the following compounds is:
ch3ch2nh2 > ch3cl > n2
The boiling point of CH3CH2NH2 is 16.6°c. The boiling point of CH3CL is -24.2 °C and the boiling point of N2 is -195.8 °C.
The boiling point is defined as the point at which the vapor pressure of the liquid becomes equal to the surrounding atmospheric pressure.
At the boiling point, the liquids start to convert into gaseous form. The boiling points always depend upon the external pressure. For example, the boiling point of certain substances at sea level won't be the same as at mount Everest.
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expression for calculating the charge of an ion
Answer:
Number of protons - number of electrons = charge on ion.
Explanation:
Describe the energy inputs and outputs of a bonfire.
Answer:
The logs are the input and the flames are the output
Explanation
Write the henderson-hasselbalch equation for a propanoic acid solution (ch3ch2co2h, pka=4.874).
Henderson's Hasselbalch equation for the propanoic acid
[tex]solution \: is \: pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]
This is called known as the Henderson- Hasselbalch equation which relates the pH of an acid aqueous solution with the acid dissociation constant.
[tex]pH=pK _{a } + log \frac{Conjugate \: base}{acid}[/tex]
The Henderson-Hasselbalch equation is derived from the definition of the acid dissociation constant as follows.
Consider the hypothetical compound HA in water.
[tex]HA +H _{2}O→ H _{3} O ^{ + } + A^{ - } [/tex]
The acid dissociation constant of HA,
[tex] [H _3O ^{ + }] = K _a \times \frac{HA}{[A ^{ - } ] }[/tex]
[tex]log [H _3O ^{ + }] = logK_a+log\frac{HA}{[A ^{ - } ] }[/tex]
Multiply both sides of the equation by -1.
[tex]-log[H_3O ^{ + }]=-logK_a-log\frac{HA}{[A ^{-} ] }[/tex]
[tex]pH=pK _{a }+log \frac{[A ^{ - } ] }{HA}[/tex]
[tex][HA] = [A-][/tex]
[tex]pH =pKa +log1[/tex]
[tex]pH = pKa + 0[/tex]
pH=pKa
pKa value of compounds can be determined experimentally using its relation with pH.
According to the Henderson-Hasselbalch equation, when the concentrations of the acid and the conjugate base are the same, i.e when the acid is 50% dissociated, the pH of the solution is equal to the pKa of the acid.
[tex]pK _{a } \: value \: for \: propanoic \:acid \: = 4.874[/tex]
[tex]Let \: propanoic \: acid \: be \: HA.[/tex]
[tex]Let \: propionate \: be \:A ^{ - } .[/tex]
So Henderson-hasselbalch equation for the propanoic acid solution is,
[tex]pH=pK _{a } + log \frac{[A ^{ - } ] }{HA}[/tex]
[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]
Therefore, Henderson's Hasselbalch equation for the propanoic acid solution is
[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}.[/tex]
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Which is the most complete charge balance expression for a saturated solution of cac2o4?
The most complete charge balance expression for a saturated solution of CaC₂O₄ is [Ca²⁺] = [C₂O₄²⁻]
Saturated solution is a solution that has dissolved as much solute as it is capable of dissolving. CaC₂O₄ is named as Calcium oxalate it is colourless solution. complete charge balance expression for a saturated solution of CaC₂O₄ are as follow:
CaC₂O₄ → 1Ca²⁺ + 1C₂O₄²⁻
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Complete combustion of 2.00 g of a hydrocarbon produced 6.43 g of co2 and 2.19 g of h2o. what is the empirical formula for the hydrocarbon? insert subscripts as necessary.
Empirical formula for the hydrocarbon is C₅H₂
Moles of C=6.43CO2 x 1 mol CO₂/44 g x 1 mol C/mol CO₂=0.14 moles of C
Moles of H=2.19 H₂O x 1 mol H₂O/18 g x 2 mol H/mol H₂O=0.12moles of H
Dividing both by 0.14
1 mol C=0.8571mol H
Multiplying both by 3
5 mol C
2 mol H
Empirical formula =C₅H₂
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Name one similarity and one difference between simple diffusion and facilitated diffusion.
Simple diffusion and facilitated diffusion are both similar types of phenomenon.
One similarity between the simple diffusion and facilitated diffusion is that they both are the passive processes. Since, passive process do not require any energy or ATP ( adenosine triphosphate ), both simple diffusion and facilitated diffusion do not have energy requirements. These diffusion process moves or transports the molecules down the concentration gradient, so they do not require energy.One difference between simple and facilitated diffusion is that facilitated diffusion takes place with the help of the action of the transmembrane proteins namely carrier proteins, channel proteins, aquaporins, etc.,In simple diffusion, there is no requirement of such transmembrane proteins. Molecules are transported directly across the cell membrane which is allowed by it.To learn more about diffusion,
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What+is+the+molar+absorptivity+of+a+solute+that+absorbs+86%+of+a+certain+wavelength+of+light+when+the+beam+passes+through+a+1.0-cm+cell+containing+a+0.16+m+solution?
The molar absorptivity of the solute that absorbs 86% wavelength of light when the beam passes through a 1.0cm cell containing a 0.16M solution is 5.375 mol L⁻¹ cm⁻¹
According to Beer-Lambert law,
"The concentration of a solution may be determined by measuring its absorbance since there is a linear relationship between the concentration and the absorbance of the solution."
A = εbC ......(i)
Where A ⇒ Absorbance
ε ⇒ Molar absorptivity
b ⇒ Length of the light path
c ⇒ Concentration
Now, A = 86%
b = 1.0cm
C = 0.16M
From (i)
A = εbC
0.86 = ε × 1 × 0.16
0.86 = ε × 0.16
ε = [tex]\frac{0.86}{0.16}[/tex] mol L⁻¹ cm⁻¹
ε = 5.375 mol L⁻¹ cm⁻¹
Therefore, the molar absorptivity of the solute is 5.375 mol L⁻¹ cm⁻¹
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how many feet are in 271 miles?
1mi=5280ft
SHOW YOUR WORK
due today help please
Answer:1,430,880 feet.
Explanation: You would multiply 271*5280 because there are 5280 feet in one mile. This equals 1,430,880 feet.
If titrating 10.00 ml of 0.1 m amino acid, how many ml of 0.1 m naoh is equal to 1 equivalent of base?
10 mL of 0.1 M NaOH is equal to 1 equivalent of base, if titrating 10.00 mL of 0.1 M amino acid.
Given :
0.1 M NaOH
0.1 M Amino acid
10.00 mL volume of Amino acid
R-CH(NH₂)-COOH + NaOH → R-CHNH₂Na + H₂O
In this case, end factor = 1 and It is 1 mole / 1 mole ratio
Since, the concentration of amino acid and NaOH are same, that is 0.1 M.
Concentration of amino acid = concentration of NaOH
0.1 M = 0.1 M
Therefore, 10 mL of NaOH is required to neutralize 10 mL of amino acid and the end factor is equivalent to 1.
Hence, The volume of 0.1 M NaOH is equal to 1 equivalent of base.
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Water has more structure than other liquids because of its ability to form hydrogen bonds. Because of this phenomena, water expresses a relatively high __________, which allows it to cushion and protect the body’s structures.
Water has more structure than other liquids because of its ability to form hydrogen bonds. Because of this phenomenon, water expresses a relatively high density, which allows it to cushion and protect the body’s structures.
Water is a chemical element consisting of hydrogen and oxygen and exists in gaseous, liquid, and solid states. It is one of the most abundant and important compounds. It is a tasteless, odorless liquid at room temperature and has the significant ability to dissolve many other substances.
You may be surprised to learn that most of Liverpool's drinking water comes from two beautiful lakes, Llyn Celyn and Vyrnwy, 80km south of Wales. Both lakes supply millions of gallons of water to the city each day. In humans, it functions as both a solvent and transport mechanism, dissolving essential vitamins and nutrients from food and delivering them to cells. Our bodies also use water to flush out toxins, regulate body temperature, and support metabolism.
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A lead ball is added to a graduated cylinder containing 30.8 ml of water, causing the level of the water to increase to 89.9 ml. what is the volume in milliliters of the lead ball, lead?
A lead ball added to a graduated cylinder containing 30.8 ml of water, causing the level of the water to increase to 89.9 ml, has a volume of 59.1 ml.
Volume is defined as the amount of space that matter occupies. There are three different ways to find the volume:
1) Volume by Space - by measuring its physical dimensions
2) Volume by Density and Mass - by dividing its weight by its density
3) Volume by Displacement - by measuring the volume displaced when immersed in a liquid or gas
To solve for the volume of the lead ball, we can use the displacement method by subtracting the initial volume from the final volume.
If the level of the water increased from 30.8 ml to 89.9 ml upon adding the lead ball, the displaced volume is:
volume = final volume - initial volume
volume = 89.9 - 30.8
volume = 59.1 ml
Hence, the volume of the lead ball, using displacement method, is 59.1 ml.
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Answer: 59.1 mL
Explanation: In order to find the volume of the lead ball, you will simply take the difference between the volume of the water before and after the ball was submerged.
Saccharomyces cerevisiae causes bread to rise by creating carbon dioxide bubbles as a byproduct of fermentation. select one: a. true b. false
"Saccharomyces cerevisiae causes bread to rise by creating carbon dioxide bubbles as a byproduct of fermentation."
This statement is true.
Fermentation is the technique of making carbon dioxide bubbles that reason the dough to rise.
Carbon dioxide is produced in the course of fermentation and turns into trapped withinside the dough as a small wallet of air. this will increase it. When baked, the carbonic acid expands and the bread rises even extra.
Bread rises due to the fact the yeast eats the sugar and releases the carbon dioxide trapped withinside the gluten of the bread. The extra sugar the yeast eats, the extra fuel line it produces, and the taller the bread rise!
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_____________ pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
What are secondary pollutants?The secondary pollutants are the type of pollutants that are formed as a result of combination of two or more primary pollutants in the presence of sunlight.
Examples of secondary pollutants include the following:
The ozone gas: This is formed as a result of the combination of hydrocarbons (HC) and nitrogen oxides (NOx) in the presence of sunlight.The acid rain: This is formed as a result of when sulfur dioxide or nitrogen oxides react with water in the presence of sunlight.Photochemical smog: This is the combination of nitrogen oxides and volatile organic compounds (VOCs) under sunlight to form a brown haze above cities.Therefore, Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
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A cube of iron, which has a density of 7.87 g/cm3, has an edge length of 3.75 cm. what is the mass of the sample?
A cube of iron, having a density of 7.87 g/cm3, has an edge length of 3.75 cm, the mass of the sample will be - 19.675 kg.
What is the mass of cube?The volume of a cube is really calculated by multiplying the length by the width and then by the height. The formula yields the measurement of one side cubed since all three measures are the same. In this case, 5 x 3 is equal to 125 cm 3. The volume is multiplied by the known density, or the mass per volume.
Iron Density = 7.87 g/cm3
Volume of Iron = 2500 cm3
Mass=(V)(D)
Mass= (2500 cm3)(7.87 g/cm3)
Mass=19,675g
= 19.675 kg
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Answer the following Question Down Below...
The mass number of the atom is 21, the atomic number is 9, and the element is Fluorine. There are 9 protons, 9 electrons, 12 neutrons, and the elemental symbol is F.
Properties of an atomFor every atom:
Protons and neutrons are located in the nucleus and the addition of both equals the mass number of atoms.Electrons are located outside the nucleus, in orbitals.Neutral atoms have the same number of electrons and protonsIn the diagram:
Number of electrons = 9
Number of protons = 9
Number of neutrons = 12
Mass number = 12 + 9
= 21
Atomic number = number of protons
= 9
Element with atomic number 9 = Fluorine
Symbol of the element = F
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