Answers
The paragraph that explains activation energy is given as follows.
Some reactions have enough "activation energy" to overcome the "energy barrier" of the reaction in order to form products. These are called "exothermic reactions". After the products are formed, "energy" is released. In other reactions, the reactants must absorb "activation energy" to overcome the "energy barrier" of the reaction. These reactions are called "endothermic reactions".
Why is activation energy important?To begin, all chemical processes, even exothermic ones, require activation energy.
Activation energy is required for reactants to move together, overcome repulsion forces, and begin breaking bonds.
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Related Questions
Taran wants to determine the mass of 7.3 moles of a compound. What additional information does Taran need
Answers
Answer: To determine the mass of the 7.3 moles of a compound Taran also needs to know the molar mass of the compound
Explanation: Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.
Add it all together and put units of grams/mole after the number.
It gives us the molar mass of the compound taken.
Multiply it with number of moles i.e., 7.3 moles, you will get the mass of the 7.3 moles of a compound.
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A solution of ammonia NH3(aq) is at equilibrium. How would the equilibrium
change if NH4* were removed from the solution?
OA. [NH4*] would increase.
OB. [H*] would increase.
C. [NH] would decrease.
OD. [NH3] would increase.
Answers
Let's check the equation
[tex]\sf NH_3+H^+\leftrightharpoons NH_4^+H_2O[/tex]
As per Le ch a.tlers principle
Any external factor affecting the concentration or temperature still change the equilibriumSo
If we remove NH_4+
Water would increase
NH_3 would decreaseOption C
Help!!
Classify each diagram as an element a compound or mixture
Answers
Answer:
1. Mixture
2. Compound
3. Compound
4. Element
Explanation:
Number 1 shows two completely different types of compounds in the same space, so it is a mixture.
Numbers 2 and 3 are compounds because there aren't different types compounds as in Number 1, but the same compound repeated. 2 is a compound because while all of the circles are the same element, they are connected. O2 for example, oxygen, is a compound.
Number 4, finally, is all of the same substance, non-connected, so it shows an element.
Brainliest, please :) (Trying to become a genius so that I can continue helping more people)
The chemotherapy drug cis-platin, Pt(NH3)2Cl2, is prepared via the chemical reaction shown below.
(NH4)2PtCl4 + NH3 ---> Pt(NH3)2Cl2 + NH4Cl
What volume of 0.400 M NH3 (ammonia) is required to completely react with 25.00 mL of a 0.100 M solution of the platinum-containing starting compound, (NH4)2PtCl4?
Answers
Answer:
12.5 mL NH₃
Explanation:
To find the volume of NH₃, you need to (1) find the moles (NH₄)₂PtCl₄ (using the molarity equation), then (2) convert moles (NH₄)₂PtCl₄ to moles NH₃ (via mole-to-mole ratio from balanced equation, and then (3) find the volume NH₃ (using the molarity equation).
(Step 1)
25.00 mL / 1,000 = 0.025 L
Molarity = moles / volume (L)
0.100 M = moles / 0.025 L
0.0025 = moles (NH₄)₂PtCl₄
(Step 2)
The unbalanced equation:
(NH₄)₂PtCl₄ + NH₃ ----> Pt(NH₃)₂Cl₂ + NH₄Cl
Reactants: 2 nitrogen, 11 hydrogen, 1 platinum, 4 chlorine
Products: 2 nitrogen, 10 hydrogen, 1 platinum, 3 chlorine
The balanced equation:
(NH₄)₂PtCl₄ + 2 NH₃ ----> Pt(NH₃)₂Cl₂ + 2 NH₄Cl
Reactants: 3 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine
Products: 2 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine
0.0025 moles (NH₄)₂PtCl₄ 2 moles NH₃
---------------------------------------- x ------------------------------ = 0.0050 moles NH₃
1 mole (NH₄)₂PtCl₄
(Step 3)
Molarity = moles / volume (L)
0.400 M = 0.0050 moles / volume
(0.400 M) x volume = 0.0050 moles
volume = 0.0125 L NH₃
0.0125 L x 1,000 = 12.5 mL NH₃
Place the following substances in order of increasing vapor pressure at a given temperature. SF6 SiH4 SF4
Answers
Substances in order of increasing vapor pressure at a given temperature is SF4 < SF6 < SiH4
The substance with the lowest vapor pressure will also have the greatest boiling point. A liquid attribute associated with evaporation is vapor pressure. The distribution of kinetic energy among the molecules in a liquid (or any substance) is influenced by the system's temperature.How do you determine vapor pressure?Vapor pressure in chemistry is the force that an evaporating substance exerts against the walls of a sealed container (converts to a gas). Use the Clausius-Clapeyron equation to determine the vapor pressure at a specific temperature: ln(P1/P2) = (Hvap/R)((1/T2) - (1/T1)Which has highest vapor pressure?
At the normal boiling point of a liquid, the vapor pressure is equal to the standard atmospheric pressure defined as 1 atmosphere, 760 Torr, 101.325 kPa, or 14.69595 psi. For example, at any given temperature, methyl chloride has the highest vapor pressure of any of the liquids in the chart.Learn more about vapor pressure
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The "barking dog" reaction is an exciting combustion reaction that generates a bright blue flame because sulfur is produced during the reaction (sulfur burns blue!). At the end of the reaction, a "woosh" sound is made which sounds like a dogs bark (hence the name of the reaction). Assume the reaction is carried out in a closed container. CS₂ + 4N₂0 CO₂ + SO₂ + S + 4N₂ Note: the equation is balanced How many moles of CO₂ can you generate if you were to carry out the reaction with 8.28 g CS₂?
Answers
From the mole ratio CO₂ and CS₂ in the reaction, the moles of CO₂ produced is 0.109 moles.
What is the mole ratio of the reaction?
The mole ratio of the reaction is the ratio in which the reactants combine to form products.
The mole ratio of the reaction is obtained from the equation of the reaction.
The equation of the reaction is given below:
CS₂ + 4N₂0 → CO₂ + SO₂ + S + 4N₂Mole ratio of CO₂ and CS₂ is 1 : 1
Moles of CS₂ reacting = mass/molar mass
Molar mass of CS₂ is 76 g/mol
Mass of CS₂ reacting is 8.28 g
Moles of CS₂ reacting = 8.28/76
Moles of CS₂ reacting = 0.109 moles
Based on the mole ratio of the reaction, moles of CO₂ produced is 0.109 moles.
In conclusion, the moles of CO₂ produced is determined from the mole ratio CO₂ and CS₂ in the reaction.
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The main constituent of gallstones is cholesterol. Cholesterol may have a role in heart attacks and blood clot formation. Its elemental percentage composition is 83.87% C, 11.99% H, and 4.14% O. It has a molecular weight of 386.64 amu. Calculate its empirical and molecular formulas.
Answers
The main constituent of gallstones is cholesterol. Cholesterol may have a role in heart attacks and blood clot formation. Its elemental percentage composition is 83.87% C, 11.99% H, and 4.14% O. It has a molecular weight of 386.64 amu. Empirical formula is C₃H₄O₁ and Molecular formula is 7(C₃H₄O₁).
What is Empirical Formula ?Empirical formula is the simplest whole number ratio of atoms present in given compound.
Element % Atomic mass Relative no. of atoms Simplest whole ratio
C 83.87 12 [tex]\frac{83.87}{12}[/tex] = 6.98 [tex]\frac{6.98}{0.25}[/tex] = 3
H 11.99 1 [tex]\frac{11.99}{1}[/tex] = 11.09 [tex]\frac{11.09}{0.25}[/tex] = 4
O 4.14 16 [tex]\frac{4.14}{16}[/tex] = 0.25 [tex]\frac{0.25}{0.25}[/tex] = 1
Thus the empirical formula is C₃H₄O₁.
How to find the Molecular formula of compound ?Molecular formula = Empirical formula × n
n = [tex]\frac{\text{Molecular weight}}{\text{Empirical formula weight}}[/tex]
= [tex]\frac{386.64}{56}[/tex]
= 7
Molecular formula = Empirical formula × n
= 7 (C₃H₄O₁)
Thus from the above conclusion we can say that The main constituent of gallstones is cholesterol. Cholesterol may have a role in heart attacks and blood clot formation. Its elemental percentage composition is 83.87% C, 11.99% H, and 4.14% O. It has a molecular weight of 386.64 amu. Empirical formula is C₃H₄O₁ and Molecular formula is 7(C₃H₄O₁).
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There are millions of organic compounds but only thousands of inorganic compounds because:______
Answers
Answer:
There are millions of organic compounds but only thousands of inorganic compounds because:
a. organic compounds were formed by living things.
b. there is more carbon on Earth's surface than any other element.
c. atoms of elements other than carbon never combine with themselves.
d. carbon atoms can combine with up to four other atoms, including other carbon atoms.
Principal energy levels describe regions of space where _____ may be found. they have values from n = 1, 2, 3 and so on. the greater the value of n, the _____ the average distance from the nucleus.
Answers
Principal energy levels describe regions of space where electrons may be found.
the greater the average distance from the nucleus.
The principal energy level of an electron is the shell or orbit in which the electron resides with respect to the nucleus. This level is represented by the principal quantum number n.
The principal quantum number n represents the total relative energy of each orbit. The energy level of each orbit increases as the distance from the nucleus increases. A set of orbitals with the same n value is often called the electron shell.
Only seven energy levels are required to contain all the electrons in any atom of any currently known element. As mentioned earlier, the energy associated with the energy level increases as the distance from the nucleus increases.
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Which image best represents a solution of distilled water at pH = 7?
Answers
Answer:
nuetral
Explanation:
water has neutral
A liquid solvent is added to a flask containing an insoluble solid. the total volume of the solid and liquid together is 81.0 ml. the liquid solvent has a mass of 40.5 g and a density of 0.865 g/ml. determine the mass of the solid given its density is 2.25 g/ml.
Answers
The mass of solid is 76.905 g.
Given that,
Total volume of solid and liquid = 81.0 mL
Mass of liquid = 40.5 g
Density of liquid = 0.865 g/mL
Density of solid = 2..25 g/mL
We need to calculate the volume of liquid
Using formula of density
[tex]Density = Mass/volume(V_{l} } )\\\\volume(V_{l} )=Mass/Density[/tex]
Put the value into the formula
[tex]V_{l} = 40.5/0.865\\\\V_{l} = 46.82 mL[/tex]
We need to calculate the volume of solid
Volume of solid = Total volume of solid and liquid- volume of liquid
[tex]V_{s} =81.0-46.82\\\\V_{s} =34.18 mL[/tex]
We need to calculate the mass of solid
[tex]P_{s}=M_{s} /V_{s} \\\\M_{s} =P_{s}V_{s}[/tex]
Using formula of density
Put the value into the formula
[tex]M_{s}=2.25 X 34.18\\\\M_{s}=76.905 g[/tex]
Hence, The mass of solid is 76.905 g.
What is density?A substance's density (more accurately, its volumetric mass density; sometimes known as specific mass) is its mass per unit volume. The most common symbol for density is (the lower case Greek letter rho).
There are three types of Density:
linear densitybulk densityarea densityLearn more about density :
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In a voltaic cell, a salt bridge is needed to allow the motion of ____________ between the terminals. In the salt bridge, _____________ move toward the anode and _________ move toward the cathode.
Answers
In a voltaic cell, a salt bridge is needed to allow the motion of ions between the terminals. In the salt bridge, anions move toward the anode and cations move toward the cathode.
What is a voltaic cell?A voltaic cell is an electrochemical device that harnesses the power of a chemical process to generate electrical energy. A voltaic cell's key components are:
Anode, an electrode where oxidation takes place. Anions move toward the anode.Cathode, an electrode where reduction takes place. Cations move toward the cathode.A salt bridge is an electrolyte chamber required to finish the circuit in a voltaic cell.Half-cells are containers that serve as a barrier between the oxidation and reduction reactions.The external circuit, which typically has a load attached to it, is used to carry electron flow between the voltaic cell's electrodes.A load is a component of a circuit that uses an electron flow to carry out a certain task.Working of a voltaic cell:When an electrode is dipped into the electrolyte at the electrode and electrolyte contact surface in a voltaic cell, the electrode's atoms tend to produce positive ions in the electrolytic solution while leaving the electrode's electrons unaffected. The electrode thus acquires a negative charge.
Additionally, the electrolytic solution's positive ions have a propensity to deposit on the electrode, giving it a positive charge. The electrodes get positively or negatively charged in relation to the electrolyte as a result of the two opposite processes. As a result, there is a potential difference between the electrode and electrolyte. The term "electrode potential" refers to this potential difference.
Now, the electrode where reduction occurs is known as the cathode and turns positive in relation to the electrolytic solution, whereas the electrode where oxidation occurs is known as the anode and has a negative potential in relation to the electrolytic solution. This caused a potential difference to form between the voltaic cell's two electrodes. Cell Potential is the name given to this potential differential.
The voltaic cell's potential is sometimes referred to as its electromotive force (EMF) when no current is being drawn from it. Electrons begin to flow from the anode (negative electrode) to the cathode when an external circuit is connected to the voltaic cell (positive electrode). As a result, in the external circuit, the normal current flows from the positive terminal to the negative terminal.
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The equilibrium constant for the reaction shown here is Kc=5.0×102. A reaction mixture at equilibrium contains [A]=1.0×10−3M. What is the concentration for the B mixture?
A(g)⇌B(g)
Here are the choices:
A. 1.0×10−3M
B. 5.0×102M
C. 1.0 M
D. 0.50 M
Answers
D. The concentration for the B mixture is 0.5 M.
concentration for the B mixturekc = [B]/[A]
where;
kc is equilibrium constantA is the concentration for the A mixtureB is the concentration for the B mixtureB = kc(A)
B = (5x 10²)(1 x 10⁻³)
B = 0.5 M
Thus, the concentration for the B mixture is 0.5 M.
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How does the tundra contribute to a reduction of carbon dioxide on earth? how is climate change affecting the tundra’s ability to reduce carbon dioxide? (site 1)
Answers
This causes organic matter to decompose faster, releasing larger amounts of carbon dioxide into the atmosphere
As a result of climate change, tundra soils are thawing deeper and deeper and for a longer time in the upper layers of surface.
What is Tundra ?The tundra is a biome on the Earth that covers approximately 20% of its land mass, and it is almost exclusively located in the Northern Hemisphere.
It is an environment that helps in the regulation of the CO2 in the atmosphere, and it is one of the biggest natural CO2 sinks. The living organisms in the tundra, are using the CO2 for their needs, thus removing parts of it from the atmospherewhen they are no more, because the tundra is cold, and the decomposition is very slow, most of the CO2 remains trapped, and doesn't go into the atmosphere.Learn more about Tundra here:
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Why is the practice of using a spatula to scoop powder from a bottle discouraged?
Answers
Answer:
it's both impossible and inefficient
Explanation:
think about it, if your spatula can even fit in the bottle will it take out a measured amount of powder? if the spatula has holes in it the powder will fall out and you will have to restart the experiment
If the ph of a solution is 6.1 what is the concentration of h+ ions in the solution
Answers
Answer:
[tex]10^{-6} \frac{mol}{L}[/tex]
Explanation:
Comparing to the solution consisting a pH of 5 containing [tex]10^{-5}[/tex] [tex]\frac{mol}{L}[/tex] of hydrogen ions, a solution having a pH of 6 consists of [tex]10^{-6} \frac{mol}{L}[/tex] of hydrogen ions. A solution having a pH of 7 too will have a pH of [tex]10^{-7} \frac{mol}{L}[/tex].
How many moles of helium are in a
45.0 liter tank at 293 K and 15.0 atm?
Answers
Answer:
28.1 moles (three sig digits)
Explanation:
Using Ideal Gas Law
PV = n RT looking for 'n' R = .082057366 L-atm/K-mole
15.0 * 45.0 = n * .082057366 * 293
n = 28.1 Moles
The number of moles of helium that are in a 45.0-liter tank at 293 K and 15.0 atm is 28.1 Moles.
What are moles?Moles is the measuring unit that measures the quantity of a substance. Moles is a SI unit.
Helium is the lightest gas, which is used in the tires of an airplane if it is filled in the balloons, the balloon flies in the sky.
Given the volume is 45.0 liter
The pressure is 15.0 atm.
The temperature is 293 K
To calculate the moles, we will use the formula of an ideal gas:
PV = n RT
R = .082057366 is the gas constant.
We have to calculate the n
Putting the values in the equation
15.0 x 45.0 = n x .082057366 x 293
n = 28.1 Moles.
Thus, the moles of helium is n = 28.1 Moles.
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By now you should realize that having an octet of electrons on a central atom is critical for a molecule to be stable. Would you expect NO and NO2 to be stable molecules
Answers
NO is a stable compound
The octet rule describes an atom's propensity to favor eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create a more stable compound.
The majority of other odd-electron molecules, including NO, are highly chemically reactive and stable compounds. The second breach of the octet rule is the presence of molecules lacking electrons. Less than eight electrons are positioned around each atom in these stable compounds.
The overall molecular orbital arrangement of NO will be as follows, nitrogen has 7 electrons and oxygen has 8 electrons, according to the molecular orbital theory.
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Need quickly!
what is the name of pb(no3)2? explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
Answers
The name of pb(no3)2 is Lead(II) nitrate.
Type of bond:pb(no3)2 is an ionic compound.
How to name ionic compound?
The name of an ionic compound is written as its cation followed by anionThe charge of cation should be written in Roman lettersThe net charge of ionic compounds is generally zeroName of pb(no3)2:
The charge of nitrate ion NO3 is -1. To find the charge of lead, we'll take it as x. Hence,
x+2(-1)=0
x=2
The charge of lead cation in this ionic compound is calculated as +2.
Therefore the name of pb(no3)2 is confirmed as Lead(II) Nitrate.
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PLEASE HURRY AND HELP
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
Fe²+, CH₂CO₂, Pb4+, MnO-4
Answers
Answer:
Fe(CH₂CO₂)₂, Fe₂MnO, Pb(CH₂CO₂)₄, PbMnO
Explanation:
Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.
1.) Fe(CH₂CO₂)₂
----> Fe²⁺ and 2 CH₂CO₂⁻
----> +2 + (-1) + (-1) = 0
2.) Fe₂MnO
----> 2 Fe²⁺ and 1 MnO⁴⁻
----> 2(+2) + (-4) = 0
3.) Pb(CH₂CO₂)₄
----> 1 Pb⁴⁺ and 4 CH₂CO₂⁻
----> +4 + (-1) + (-1) + (-1) + (-1) = 0
4.) PbMnO
----> 1 Pb⁴⁺ and 1 MnO⁴⁻
----> +4 + (-4) = 0
The group of students then did an experiment using four different solutes to see which one would be best in their hot pack. To determine which solute would be best, the students mixed 20 g of each solute into separate containers that each held 50 mL of 24°C water. The students then recorded the temperature changes in each container. The data table below shows the maximum and minimum temperature they obtained for each solute, as well as the temperature difference.
Answers
Based on the value of temperature increase, the best solute to be used in the hot pack is calcium chloride.
What are exothermic reactions?Exothermic reactions are reactions in which heat is liberated or given by the substances reacting.
The reaction in hot packs are exothermic reactions.
Based on the increase in temperature observed when 20 g of each solute is mixed into separate containers that each held 50 mL of 24°C water, the best solute to be used in the hot pack is calcium chloride.
In conclusion, exothermic reactions give off heat.
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Give the coordination number and the charge of the central metal ion in each coordination compound: For the charges, enter your answers with the correct sign. e.g. if you think the answer is 1, enter the positive sign followed by the number 1. Na2[Zn(OH)4] coordination number
Answers
The coordination number shows the number of ligands attached to the central metal.
What is complex in coordination compound?A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds. Ligands are Lewis bases - they contain at least one pair of electrons to donate to a metal atom/ion.A complex is a coordination compound which contains a central metal atom or ion. The coordination number refers to the number of ligands in the complex. The coordination number usually influences the geometry of the complex compound.The coordination number and the charge on the central metal in each of the complexes are shown below;
Na2[Zn(OH)4] - The coordination number of the complex is 4 and the charge on the central metal ion is +2.
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The element with the lowest melting point is: Select one: a. B b. Al c. Ga d. Tl e. All of these have the same melting point.
Answers
The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.
Melting point is usually defined as the temperature at which solid changes to liquid.
What is the order of melting point of B, Al, Ga, Tl ?The melting point order of B, Al, Ga, Tl is B > Al> Tl > Ga due to structural changes, melting point increases from Ga to Tl. Hence Ga has the lowest melting point among all these.
Thus from the above conclusion we can say that The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.
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- According to collision theory, what is not a factor that determines if two molecules will bind?
A. The direction the molecules are facing.
B. The speed the molecules are traveling.
C. The specific heat of the molecules.
D. What element the molecules are.
Answers
The factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing
What is collision theory?Collision theory is a theory which describes of predicting the rate at which chemical reactions occurs between atoms and molecules of elements.
So therefore, the factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing
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Bonding gels and _____ are designed specifically to improve adhesion of light cured gels to the natural nail plate. glossing gels self-leveling gels gel primers building gels
Answers
Bonding gels and gel primers are designed specifically to improve adhesion of light cured gels to the natural nail plate and is therefore denoted as option C.
What is Adhesion?This is defined as the tendency of particles or substance which have dissimilar origins to stick to one another. A common adhesive is referred to as glue, cement etc and ensures there is enough resistance for their separation in case of the presence of any type of external force or stimuli acting on them.
Gel primer is referred to a vital used in makeup and serves as a form of foundation before they are applied on the skin of individuals so as to enable it stick and also look more presentable.
This is therefore the reason why gel primers was chosen as the most appropriate choice.
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help please asap!!!
5. The maximum acceptable concentrations of the chemicals listed in Table 2 on page 283, are based on an average daily intake of 1.5 L of drinking water.
a) If a community’s drinking water contained the maximum acceptable levels of lead, how much lead would a person in the community consume in a year?
b) Would you willingly drink this water? Give reasons for your decision.
Answers
Based on the the US Environmental Protection Agency guidelines, the maximum allowable concentration of lead in drinking water, yearly intake of lead by the individual = 8.21 mg.
I would not willingly drink the water due to the risk of lead poisoning.
What is the maximum acceptable concentration of Lead in Drinking water?Based on the US Environmental Protection Agency guidelines, the maximum allowable concentration of lead in drinking water is 0.015 mg/L.
a)Given daily average intake of water is 1.5, in one year;
Volume of water intake = 1.5 * 365 = 547.5 L
Yearly intake of lead by the individual = 0.015 mg/L * 547.5
Yearly intake of lead by the individual = 8.21 mg
b) I would not willingly drink the water due to the risk of lead poisoning.
In conclusion, safe, drinking water should be free on contaminants such as lead to avoid lead poisoning.
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What is the wavelength of a photon if the energy is 7.69 × 10⁻¹⁹ j? (h = 6.626 × 10⁻³⁴ j • s)
Answers
The wavelength of a photon if the energy is 7.69 × 10⁻¹⁹ J is
Calculation,
Given energy = 7.69 × 10⁻¹⁹ J
Plank's constant = 6.626 × 10⁻³⁴ J.s
Formula used:
E = hv
E is the energyh is plank's constantv s frequencyv = c/ lemda
Where, c = speed of light =
lamda = wavelength of the photon
Putting the value of v in equation (i), and rearrange the equation.
E = hc/lemda = 6.626 × 10⁻³⁴ J×3[tex]10^{8}[/tex]/lemda = 7.69 × 10⁻¹⁹ J.s
lamda = 6.626 × 10⁻³⁴J×3[tex]10^{8}[/tex] m[tex]s^{-1}[/tex]/7.69 × 10⁻¹⁹J.s = 2.58× [tex]10^{-9}[/tex]m =2.58 nm
So, wavelength of a photon is 2.58 nm
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In a titration of a monoprotic weak acid with sodium hydroxide, the ph at the half-equivalence point is 4. 20. What is the experimental ka value of this acid?.
Answers
Ka value of monoprotic weak acid:
The experimental ka value of this acid is 6.3 × [tex]10^{-5}[/tex]
Half-equivalence point:
The pH of the solution will be equal to the pKa of the weak acid at the half-equivalence point.At the equivalence point, the strong base OH- will neutralize the weak acid in the case of a weak monoprotic acid, which I'll denote as HA.HA + OH⁻ → A⁻ + H₂OThe moles of OH are equivalent to the moles of the acid since the acid is monoprotic:
At half equivalence point, pH = pKₐ
The pKa is determined by the weak acid's Ka acid dissociation constant.
pKₐ = -log(Kₐ)
Kₐ = [tex]10^{-pKa}[/tex]
At the half equivalence point,
Kₐ = [tex]10^{-pH}[/tex]
Given,
pH = 4.20. By putting the value;
Kₐ = [tex]10^{-4.20}[/tex]
= 6.3 × [tex]10^{-5}[/tex]
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Lidocaine is available in an ampule with 100 mg in 5 ml of solution. how many ml do you give to administer 65 mg?
Answers
Lidocaine is available in an ampule with 100 mg in 5 ml of solution. We need to give 3.25ml to administer 65mg.
Lidocaine is an anesthetic that has the power to neutralize neuromal membranes.
Given data:
Amount desired (D) = 65 g
Amount on hand (H) = 100 mg
Quantity = 5 mL
Plug in what you know into the formula and simplify.
[tex]\frac{Amount desired}{Amount in hand}[/tex] × quantity
[tex]\frac{65}{100}[/tex] × 5
0.65 × 5 = 3.25ml
Therefore, When Lidocaine is available in an ampule with 100 mg in 5 ml of solution. We need to give 3.25ml to administer 65mg.
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Carbon has six protons; therefore, its mass number is six.
a. true
b. false
Answers
Answer:
B.) False
Explanation:
The mass number is determined by adding the number of protons and neutrons in an element's nucleus. Since carbon has 6 protons and 6 neutrons, the mass number is 12.
The atomic number is determined by the number of protons in an element's nucleus. Since carbon has 6 protons, the atomic number is 6.