Often microscopic examination of a specimen involves many procedures to be followed, from slide preparation to adjust the focal length in the microscope. These steps are of paramount importance for microscopic examinations.
Reducing the size of air bubbles under the coverslip cannot be done easily after the coverslip is put over the specimen. Preferably a needle is used while cautiously putting the coverslip over the specimen to avoid air bubbles. Though adding stains along the edges may work for some time, it is better to do the step of covering with coverslip one again cautiously.
The given picture shows that it is option 4 that seems to be correct than options 1, 2, and 3. We often add stain or solution to a slide without removing the coverslip. Because to prevent air bubble formation and also to reduce excess stain, this method of stain addition is good.
Placing a paper towel to soak up excess liquid is good for the slide to look neat and tidy with even diffusion of stain throughout the coverslip. Thus it makes the observation via microscope very legible and clear with proper light adjustment.
Hence proper microscopic examination and the steps prior to it ( preparation of slides) are of paramount importance for one to excel in this field.
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What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide?
Potassium hydroxide (KOH), when in an aqueous solution, splits into two ions, a potassium K+K+ cation, and a hydroxide OH−OH− anion.
The ionic equationK+(aq)+OH−(aq)+H+(aq)+Cl−(aq)→K+(aq)+Cl−(aq)+H2O(l)
Similarly, hydrochloric acid (HCl), when in an aqueous solution, breaks into two ions, a proton H+H+ cation, and a chloride Cl−Cl− anion.
The dissociation of a compound turns upon its solubility.
According to the ionic equation, in the response between HCl and KOH, the potassium K+K+ cation and the chloride Cl−Cl− anion do not accept a stake in the chemical equation. These are spectator ions.
OH−(aq)+H+(aq)→H2O(l)
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questiona chemical reaction gives off 2,100 kj of heat energy.about how many calories is it equal to?(1 calorie
A chemical reaction gives off 2,100 kJ of heat energy which is 5.0×10^5 calories.
What is heat energy?
The movement of minuscule atoms, molecules, or ions in solids, liquids, and gases produces heat energy. From one thing to another, heat energy can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.
1KJ = 1000J
2100KJ = 2100×1000
=2,100,000J
Let a be the no. of calories.
1 Calorie =4.18J
a calorie =2100000J
a= 2100000/4.18
a= 502392.3445
a = 5.0× 10^5 calories
Question:
A chemical reaction gives off 2,100 kJ of heat energy.
About how many calories is it equal to?
(1 calorie=4.18 Joules)
(a)5.0 × 10³ calories
(b)5.0×10^4 calories
(c)5.0×10^5 calories
(d)5.0×10^6 calories
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what is the purpose of the aqueous sodium bisulfite solution that is added during the workup of the bromination reaction? group of answer choices to destroy the unreacted acetic acid to dry the organic phase during the workup procedure to generate a better electrophile to destroy the unreacted bromine
To destroy the unreacted Bromine
Bromination of aniline is carried out in by reacting aniline with bromine and acetic acid. This reaction results in a tri-substituted product called 2,4,6 tribromoaniline which is a white precipitate
During Bromination reaction , Sodium Bisulfite may be added if there is any unreacted bromine left in the reaction mixture. This is necessary because unreacted Bromine can interfere with the reaction due to bromine's oxidizing characterstics.
Sodium Bisulfite Solution is a reducing agent and it can convert unreacted bromine and bromate by reducing it to bromide.
Moreover, Sodium bisulfite can also help in discharge the resulting colour of the solution due to the bromine present.
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What do you call of force acting on the ball along the horizontal line or along the that makes the ball in motion
Tension force is the force applied on the ball in a horizontal direction or along the that makes the ball in motion
Tension force is the horizontal pulling force imposed on an object by a string, rope, or cable from the opposite end. The ball is linked to a string or rope in this scenario, which is exerting tension on the ballStretching the rope or string in an attempt to bring the ball closer to it creates tension force. The ball will have a tendency to overcome the force at this point, which is why the ball will move once the force is removed.To know more about Tension force visit : https://brainly.com/question/2287912
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Pls Help ASAP! 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced?
O 10 grams
O 7 grams
O 2 grams
O 5 grams
Taking into account the reaction stoichiometry, 2.4041 grams of K₂O can be produced from 2 grams of K and 5 grams of O₂.
Reaction stoichiometryIn first place, the balanced reaction is:
4 K + O₂ → 2 K₂O
By reaction stoichiometry (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:
K: 4 molesO₂: 1 mole K₂O: 2 molesThe molar mass of the compounds is:
K: 39.1 g/moleO₂: 32 g/moleK₂O: 94.2 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
K: 4 moles ×39.1 g/mole= 156.4 gramsO₂: 1 mole ×32 g/mole= 32 gramsK₂O: 2 moles ×94.2 g/mole= 188.4 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 32 grams of O₂ reacts with 156.4 grams of K, 5 grams of O₂ reacts with how much mass of K?
mass of K= (156.4 grams of K× 5 grams of O₂)÷ 32 grams of O₂
mass of K= 24.4375 grams
But 24.4375 grams of K are not available, 2 grams are available. Since you have less mass than you need to react with 5 grams of O₂, K will be the limiting reagent.
Mass of K₂O formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 156.4 grams of K form 188 grams of K₂O, 2 grams of K form how much mass of K₂O?
mass of K₂O= (2 grams of K× 188 grams of K₂O)÷ 156.4 grams of K
mass of K₂O= 2.4041 grams
Then, 2.4041 grams of K₂O can be produced from 2 grams of K and 5 grams of O₂.
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Answer:
(Question) What does the Law of Conservation of Mass state?
(Answer) The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.
(Question) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be __.
(Answer) 30 grams
(Question) 78 g of potassium (K) react with 71 g of chlorine (Cl) to produce potassium chloride. According to the Law of Conservation of Mass, what is the mass of the product (2KCl)?
(Answer) 149 g
(Question) 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced?
(Answer) 7
(Question) Which of the following equations demonstrates the Law of Conservation of Mass?
(Answer) CH4+O2→C+2H2O
Explanation:
just finished the quick check. hope this helps UwU
Calcium carbonate is a white solid with a density of 2.71 g/cm3. it reacts readily with an acid to produce gaseous carbon dioxide.
Calcium carbonate (CaCo3) is a white solid and gaseous with the density of 2.71 g/cm^3 that can be easily calculated or observed without a chemical reaction, so it is simply a physical property.
Now the second sentence says that it reacts readily with an acid to produce gaseous carbon dioxide.
Let's take a chemical reaction:
CaCO3( Calcium Carbonate) + 2HCl (Hydrochloric Acid) ----> CaCl2 (Calcium Chloride) + CO2 (Carbon Dioxide) + H2O (Water)
Hence it readily reacts with acids so it is clearly a chemical change and falls into chemical property.
Physical properties denote or comprises density, color, melting and boiling point where as chemical properties comprises of it goes in a particular chemical reaction and changes.
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how many moles of na₂so₄ are in a 0.140 m aqueous solution that was prepared with 2.30 kg of water ?
The moles of na₂so₄ are in a 0.140 m aqueous solution that was prepared with 2.30 kg of water is 0.00032moles
Moles and molarity of a substanceThe formula for calculating the molarity of a substance is expressed as;
molarity = moles/Volume
Given the following parameter
Molarity = 0.140M
volume = mass/density
Volume = 2.30/997 kg/m³
Volume = 0.0023m³
Determine the required moles
Moles of na₂so₄ = molarity * volume
moles of na₂so₄ = 0.140 * 0.0023
moles of na₂so₄ = 0.00032moles
Hence the moles of na₂so₄ are in a 0.140 m aqueous solution that was prepared with 2.30 kg of water is 0.00032moles
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Ethylene glycol (antifreeze) has a density of 1.11 g/cm3 . what is the mass in grams of 387 ml of ethylene glycol?
429.57 g is the mass in grams of 387 ml of ethylene glycol.
What is ethylene glycol?
Ethylene glycol is also called ethane 1,2 diol. This organic compound is highly toxic. it's also known as Ethane-1,2-diol or Monoethylene glycol. it has no smell and is viscous.
cm^3 = mL
1.11 g/cm^3 = 1.11 g/mL
Density (g/mL) multiplied by volume (mL) will give us the mass (g)
1.11 g/mL * 387 mL = 429.57 g
The mass of ethylene glycol is 429.57 g.
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What species is reduced in the reaction of iron(iii) oxide with carbon monoxide to produce iron metal and carbon dioxide?
Reaction of Iron(III) oxide (Fe2O3) with carbon monoxide (CO) to form iron (Fe) and carbon dioxide (CO2), is a redox reaction as both oxidation of carbon monoxide and reduction of iron is taking place.
What is Oxidation?
Redox reactions include a change in the oxidation state of the substrate. Loss of electrons or a rise in an element's oxidation state are both considered to be oxidation. Gaining electrons or lowering the oxidation state of an element or its constituent atoms are both examples of reduction.
Therefore,
What species is reduced in the reaction of iron(iii) oxide with carbon monoxide to produce iron metal and carbon dioxide?
Reaction of Iron(III) oxide (Fe2O3) with carbon monoxide (CO) to form iron (Fe) and carbon dioxide (CO2), is a redox reaction as both oxidation of carbon monoxide and reduction of iron is taking place.
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The concentrations of sodium and potassium are fairly constant. however, there is a transmembrane potential charge difference that exists across the membrane. how is this possible?
The level of sodium and potassium are constant but there is a transmembrane potential charge because Na and K levels are not equal within and outside the cell.
What is the membrane potential?The membrane potential is a difference in the electrical charge of ions such as sodium and potassium across the plasma membrane, which is used by the cell to carry out different functions.
In conclusion, the level of sodium and potassium are constant but there is a transmembrane potential charge because Na and K levels are not equal within and outside the cell.
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Answer:
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Explanation:
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Write a brief passage describing a neutral atom of nitrogen-14 (N-14). Describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles
the passage describing a neutral atom of nitrogen-14 (N-14) is as follows:
Its nucleus comprises seven protons.
Its nucleus of it has seven neutrons.
Around the nucleus, there are seven electrons arranged in orbits.
Its protons make up its atomic number.
Protons and neutrons together make up their atomic mass.
What is nitrogen-14?
It is demonstrated that nitrogen-14 NMR spectra with spin I = 1 can be detected indirectly in powders spinning at the magic angle (MAS). The approach is based on the transmission of coherence to single- or double-quantum transitions of nitrogen-14 nuclei from a nearby nucleus with S = 1/2, such as carbon-13. Second-order quadrupole–dipole cross terms, also referred to as residual dipolar splittings, are responsible for coherence transfer. The second-order quadrupolar interactions of nitrogen-14 are shown to be responsible for the powder patterns in the two-dimensional NMR spectra. The nitrogen-14 quadrupolar coupling constant, CQ, and asymmetry parameter, Q, are obtained through spectra analysis. These variables may be connected to the solids' structure that contains nitrogen.
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At what temperature does 3.45 moles of n2 occupy a volume of 77.3 l at a pressure of 3.95 atm?
The Temperature of N2 is 1078K
How do you calculate ideal gas?
Calculations Using the Ideal Gas Law
P=nRTV. Calculate volume:
V=nRTP. Calculate moles:
n=PVRT. Calculate temperature:
T=PVnR.
We use the temperature formula,
now,
T=PVnR
where p = pressure
V= volume
nR = no of moles
Given that
p = 3.95 atm
V= 77.3 I
nr = 3.45 moles
T=PVnR
T= 3.95*77.3*3.45
T= 1078K
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How much heat, in kj, is produced by the amount of octane needed to drive 573 kilometers in a car that averages 22.8 km/l?
Combustion of octane
16 CO2(g) + 18 H2O = 2 C3H18(1) + 25 O2(g) (1)
ΔΗO -10, 932 kJ
What is combustion?
Combustion is the process of a substance burning in the presence of oxygen to produce heat and light.
You may have heard that some materials are combustible while others are not. Simply put, combustible compounds are those that go through this process.
Burning is actually referred to as combustion in science. Burning is a phenomenon that we are all familiar with, but did you realise that it is also a chemical reaction? Any fuel reacts chemically with air (an oxidant) during combustion to produce heat energy. Additionally, a flame will appear as a result of the release of heat energy.
Following complete combustion, octane (C,H,g, density = 0.699 g/mL) produces energy as shown by the following reaction:
16 CO2(g) + 18 H2O = 2 C3H18(1) + 25 O2(g) (1)
ΔΗO -10, 932 kJ
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Precipitate-forming reactions would be most appropriate for identifying the presence of _______________.
The best method for determining whether an element is present in that solution would be to look for precipitate-forming reactions.
What is precipitate forming reaction?
In a precipitation reaction, dissolved chemicals combine to create one or more solid products. These kinds of reactions, which are also known as double displacement, double replacement, or metathesis reactions, frequently take place in aqueous solutions and involve the exchange of ions between ionic compounds.
The presence of a specific element in a solution can be checked via precipitation reactions. The presence of lead in water sources could be checked by adding the chemical and watching for the appearance of a precipitate if, for instance, a chemical combines with lead to generate a precipitate.
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The average interest rate for a savings account in 2021 is 0.4ompounding continuously. how long will it take to double your money? use your calculator to find the solution.
The average interest rate for a savings account in 2021 is 0.4 Compounding continuously. it will take 11.8 years to double your money
Equating :A = Peⁿt
50000/25000 = 25000e/25000
2 = [tex]e^{0.0588t}[/tex] ( e = 2.73)
(0.0588t)
ln = log[tex]_{e}[/tex]
ln(2) = ln([tex]e^{0.0588t}[/tex])
[tex]\frac{ln(2)}{0.0588}[/tex] = [tex]\frac{0.0588t}{0.0588}[/tex]
equating t in the equation we get ,t = 11. 788
t = 11.8 years.
So it'll take approximately 11.8 years for the investment to double if it's compounding continuously at 5.88%.
What is a good interest rate on a savings account?The best savings account interest rates are around 2%. At a brick-and-mortar bank, you'll often find savings rates closer to the national average, which is currently 0.13%.
What is better than a savings account?High-Yield Checking Accounts
There are high-yield checking accounts that provide better interest rates than savings accounts. a number of these checking accounts offer up to a 2% annual percentage yield, in contrast to lower bank account rates.
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Coenzymes such as ___________ are used to carry electrons to and from many kinds of oxidation/reduction reactions.
Coenzymes such as NADH and FADH2 are used to carry electrons to and from many kinds of oxidation/reduction reactions.
What are coenzymes?
A macromolecule that catalyses a chemical process is an enzyme. In other words, it creates the possibility of a negative reaction. Smaller molecules are used to construct enzymes to create an active component. The coenzyme is one of an enzyme's most crucial components.
Small molecules make up coenzymes. They are unable to catalyse reactions on their own, but they can assist enzymes in doing so. Coenzymes are organic nonprotein molecules that join with the protein molecule (apoenzyme) to create the active enzyme, according to the technical definition (holoenzyme).
In biological oxidation-reduction reactions, NADH and FADH2 are two coenzymes that are extremely important. Along with the transfer of electrons, hydrogen ions also occur.
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An iron core is wrapped with a metal wire and connected to a battery. When it is placed between the poles of a magnet and an electric current passes through the wire, the coil rotates. Which device was built?
Answer:
What you created using the tightly wound wire around the nail is called a solenoid [ sōl -ë-noid]. When an electric current passes through the wire, it creates a magnetic field in the metal core (the nail). When the wire is wrapped around the iron nail and the battery is strong enough, you create a simple electromechanical solenoid.
Explanation:
How+long+will+it+take+for+20+%%+of+the+c-14c-14+atoms+in+a+sample+of+c-14c-14+to+decay?
It will take 5730 years.
What is C-14 atoms ?The radioactive isotope of carbon with the symbol 14C, often known as radiocarbon, has an atomic nucleus made up of 6 protons and 8 neutrons. The radiocarbon dating technique, developed by Willard Libby and colleagues in 1949 to date archaeological, geological, and hydrogeological samples, is based on its presence in organic molecules.
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What is the difference in hydrogen bonding between a/t pairs versus g/c pairs? a/t pairs have one more hydrogen bond than g/c pairs. g/c pairs have one more hydrogen bond tha
Adenine (A) particularly interacts with thymine (T) in DNA and uracil (U) in RNA, whereas guanine (G) and cytosine (C) experience a specific hydrogen bonding with each other. Quantitatively, three hydrogen bonds hold each GC base pair together, but only two hydrogen bonds hold each AT and AU base pair together.
What distinguishes GC pairing from a pairing?Only two hydrogen bonds exist in A-T/U-. Three hydrogen bonds exist in G-C-.Between bases, hydrogen atoms bind. Between guanine and cytosine, there are 3 HB. Between adenine and guanine, there are two hydrogen bonds. Therefore, DNA is more stable if its GC concentration is larger.
Why do various base pairs' glycosidic bonds have different angles?An alternate hydrogen bonding mechanism is made possible by the 180° rotation of the adenine in the A and T base pair with respect to the glycosidic bond. Guanine is also rotated 180 degrees around the glycosidic link in the G and C pair. Furthermore, Hoogsteen base pairs have a greater glycosidic bond angle.
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The Na+ /K+ pump transports three sodium ions out of the cell for every two potassium ions moved into the cell. this is an example of?
The Na+ /K+ pump transports three sodium ions out of the cell for every two potassium ions moved into the cell. This is an example of an antiport pump.
What is the function of Na+ /K+ pumps?The function of Na+ /K+ pumps is to maintain the osmotic equilibrium and membrane potential inside the cells of living organisms. These pumps facilitate the movement of sodium and potassium ions against the concentration gradient.
In this question, three sodium ions out of the cell for every two potassium ions moved into the cell. This means the movement of ions is bidirectional. So, this is an example of an antiport pump.
Therefore, the Na+ /K+ pump is an example of an antiport pump that is classified in the category of active transport.
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In exponential smoothing, the closer alpha is to ________, the greater the reaction to the most recent demand.
In the exponential smoothing, the closer alpha is to 1, the greater the reaction to the most recent demand.
What is exponential smoothing?Exponential smoothing is a way to smooth out data for the presentations or to make forecasts. It’s usually used for the finance and economics. If you have a time series with a clear pattern, you could use moving averages — but if you don’t have a clear pattern you can use the exponential smoothing to forecast.
Damping Factors
Perhaps one of the most confusing aspects of the exponential smoothing is the damping factor. Damping factors are used to smooth out graph and take on a value between 0 and 1. Technically, damping factor is 1 minus the alpha level (1 – α). But all you really need to know is the smaller alpha levels (i.e. larger damping factors), smooths out peaks and valleys more than larger alpha levels (smaller damping factors). Smaller damping factors also mean that your smoothed values are closer to actual data points than larger damping factors.
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What is the name given to the smallest group of atoms, ions, or molecules that form the building block of a mineral?.
Answer:
The answer to above is Unit cell
A 5.00 l container is filled with 0.300 atm acetylene and 0.800 atm hydrogen, which react according to:____.
A 5.00 l container is filled with 0.300 atm acetylene and 0.800 atm hydrogen, which react according to: C2H2(g) + 2 H2(g) C2H6
what is a reaction?
A chemical reaction occurs when two or more molecules collide with the right orientation and enough force to produce a new product. Atomic bonds are created and disrupted throughout this process. Products, as opposed to reactants, are the compounds that result from an interaction between two other substances.
Substances are made up of chemical components or chemical elements. The atoms that make up the reactants in a chemical reaction are rearranged to create different products. A essential aspect of life itself, as well as technology and civilization, are chemical reactions.
0.300 atm acetylene and 0.800 atm hydrogen are placed in a 5.00 l container, where they react as follows: C2H2(g) + 2 H2(g) C2H6.
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An atom has 33 protons, 42 neutrons in its nucleus and 33 electrons in the electron cloud. What is the charge of the atom's nucleus?
Answer:
arsenic
Explanation:
Name -Arsenic
Symbol -As
Atomic Number -33
Atomic Mass -74.9216 atomic mass units
Number of Protons -33
Number of Neutrons -42
Number of Electrons -33
Trust
Does the sun reproduce
Answer: no
Explanation:
It aint got the dingdong and besides whos the mommyy??
the sun produces high frequency waves like gamma rays.
which of the following pairs of atoms would be most likely to form ions and thus an ionic bond with each other?
The atoms potassium(K) and chlorine(Cl) are most likely to form ions and thus an ionic bond with each other.
What are ionic bonds?
An ionic bond is a particular kind of chemical bond that is created by the electrostatic attraction of two ions with opposing charges. These ions are produced when two atoms, typically a metal and a non-metal, exchange their valence electrons.
The elemental couples that have the highest likelihood of forming an ionic connection are Cl and K.
Since,
Ionic compounds are created when an equal-sized cation (a metal ion) and anion (a non-metal ion) attract electrostatically. They form a more covalent bond if the cation and anion are of different sizes, with the cation being very small and the anion being very large.A single charged atom or a small group of charged atoms can form an ion (molecule). The elemental pairs most likely to form an ionic bond are Cl (non-metal) and K (metal).Metal ions (K) in this combination may give electrons, whereas non-metal ions (Cl) may accept electrons. Between elements that have a relatively low ionisation enthalpy and those that have a relatively high negative electron gain enthalpy, ionic compounds will form more readily.To learn more about ionic bonds from the given link below,
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When both the pressure and the absolute temperature of an ideal gas are increased each by a factor of two, the volume occupied by the gas will?
The gas will continue to occupy the same volume.
Absolute temperature is exactly proportional to kinetic energy; it is independent of the characteristics of any given substance.
What is absolute temperature?
Using the Kelvin scale, where 0 is absolute zero, absolute temperature is measured. The zero point is the temperature where matter's particles move the least and cannot get any colder.
The Kelvin scale's absolute zero represents the starting point for measuring absolute temperature. The study of thermodynamics is one scenario in which one might utilize absolute temperature as a unit of measurement. temperature measured on the Rankine or Kelvin scales starting from absolute zero.
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Calculate the molarity of 200 grams of glucose (c6h12o6) in 1.0 liters of solution
The molarity of 200 grams of glucose (c6h12o6) in 1.0 liters of solution is 1.11M solution
What is molarity?Molarity is number of moles of solute per one liter of solution. Symbol for molarity is capital M.
In chemistry, solution is a mixture of two or more substances in which neither substance changes chemically. For example, salt water is solution that contains water (the solvent) and salt (the solute). Concentration is amount of dissolved substance in a solution. In other words, it is the amount of the stuff that has been mixed into your liquid, concentration is usually measured in molarity.
A mole is basic unit in chemistry. It is the amount of substance in grams that contains as many atoms, molecules, or ions as 12 grams of carbon-12 (6.022 x 1023) does. Molarity is number of moles of a solute per liter of solution. If we wanted to know the molarity of our salt water solution, we would want to know how many moles of salt are in every 1 liter of water.
So to calculate,
molarity=moles of solute/ liters of solution
molarity= 200g c6h12o6 ( 1mol/180g)= 1.11mol c6h12o6
1.11 mol/1.0liters= 1.11M solution
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i need the answers pleaseee! this is acids and bases for chemistry
Answer:
for pH 13 it = strong based the ph 2 is= weak acid
Explanation: