The difference in absorption between ti(h2o)6 3 and tif6 3 is due to the different electronic configurations and molecular geometries of the two complexes.
The absorption of light by a complex is related to the energy required to promote an electron from a ground state orbital to an excited state orbital.In ti(h2o)6 3, the titanium atom is surrounded by water ligands which create a high spin d2 configuration. In tif6 3, the titanium atom is surrounded by fluoride ligands which create a low spin d1 configuration.
This phenomenon occurs because the energy required for electronic transitions in TiF6 3- is lower than in Ti(H2O)6 3+, resulting in the observed difference in light absorption.
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(ii) Calculate the maximum mass of ethanol that could be obtained
g from 30.0 g of glucose.
Taking into account the reaction stoichiometry, 15.33 grams ethanol could be obtained from 30 grams of glucose.
Reaction stoichiometryIn first place, the balanced reaction is:
C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂
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:
C₆H₁₂O₆: 1 mole C₂H₅OH: 2 molesCO₂: 2 molesThe molar mass of the compounds is:
C₆H₁₂O₆: 180 g/moleC₂H₅OH: 46 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₆H₁₂O₆: 1 mole ×180 g/mole= 180 gramsC₂H₅OH: 2 moles ×46 g/mole= 92 gramsCO₂: 2 moles ×44 g/mole= 88 gramsMass of C₂H₅OH formedThe following rule of three can be applied: if by reaction stoichiometry 180 grams of glucose form 92 grams of ethanol, 30 grams of glucose form how much mass of ethanol?
[tex]mass of ethanol=\frac{30 grams of glucosex 92 grams of ethanol}{180 grams of glucose}[/tex]
mass of ethanol= 15.33 grams
Then, 15.33 grams ethanol could be obtained from 30 grams of glucose.
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Please help me!
List A
(a) Gas pressure
(b) One mole of substance
(c) One mole of any gas
(d) Avogadro's number
List B
(i) 6.02 × 1023
(ii) 22.4 dm³ at STP
(iii) force per unit area
(iv) 6.02 x 1023 particles
Answer:
(a) Gas pressure ---------------------> (iii) force per unit area
(b) One mole of substance -------------------> (i) 6.02 x 10²³
(c) One mole of any gas ----------------------> (ii) 22.4 dm³ at STP
(d) Avogadro's number -----------------> (iv) 6.02 x 10²³ particles
An evil villain wants to broadcast a message to everyone on Earth. They are using satellites for the communication process. For them, money is not an option, only their ultimate goal of world domination. If they are able to place their satellites wherever they want, how many satellites do they need to broadcast their evil message to everyone on Earth?
The correct placement of the coefficient in a chemical equation is...
Select one:
a. within the formula of a reactant or product.
O b. in front of the formula of a reactant or product.
O c. in front of the chemical equation.
O d. after the formula of a reactant or product.
Answer:
B.) in front of the formula of a reactant or product.
Explanation:
Coefficients modify the amount of a particular molecule. As such, they are placed directly in front of the molecule's formula.
How are ionic compounds formed?
Answer:
Atoms gain/lose electrons and are held together by electrostatic forces.
3H2 + blank, reaction arrow, 2NH3
How to complete this equation so that it is a Synthesis reaction
The reaction is completed by the equation below: [tex]3H_2 + N_2 --- > 2NH_3[/tex]
What are synthesis reactions?They are chemical reactions in which two or more molecules react to produce a single product.
In this case, the synthesis reaction is that of ammonia. Molecules of hydrogen gas and nitrogen gas combine to produce ammonia.
The equation of the reaction is as follows: [tex]3H_2 + N_2 --- > 2NH_3[/tex]
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21. In infrared spectroscopy, absorption of electromagnetic radiation results in transitions between ________ energy levels.
In infrared spectroscopy, absorption of electromagnetic radiation results in transitions between Vibrational energy levels.
What does spectroscopy mean?Definition of spectroscopy Spectrum analysis is the study and measurement of the spectrum that matter emits when it interacts with electromagnetic (EM) radiation. It is the investigation of how frequency or wavelength affects the relationship between matter and radiation.
The various forms of spectroscopy include the following:
Acoustic resonance: A type of spectroscopy that primarily uses the ultrasonic and sonic ranges of sound. It is a popular, affordable approach for classifying and valuing materials.X-ray photoelectron: This technique makes use of the diffraction patterns that X-rays produce as they travel through crystalline materials. The nature of the crystal structure can be inferred from these patterns.You can use circular dichroism, a type of light absorption spectroscopy, to determine how differently a sample absorbs left- and right-circularly polarized light.It is appropriate for exploring the electronic structure of molecules and detecting the compounds present. Ultraviolet-Visible (UV/Vis) Spectroscopy. It aids in the recognition of peptide bonds, coenzymes, side chains of amino acids, and prosthetic groups.NMR Spectroscopy: This technique uses nuclear magnetic resonance to measure the magnetic fields surrounding the nuclei. Radio waves are used to excite atomic nuclei in a material. Spectroscopy of the infrared range of the electromagnetic spectrum is known as infrared spectroscopy. Longer wavelengths and lower frequencies are found in infrared photons, and in infrared spectroscopy, the idea of absorption spectroscopy is used.Raman spectroscopy is a method of spectroscopy used to examine low-frequency system modes such as rotational, vibrational, and other modes.Learn more about Spectroscopy here:-
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If you are given 0.25 mol of Fe and 0.5 mol of O2, what is the limiting reactant?
The limiting reactant will be Fe.
What are limiting reactants?They are reactants that are available in limited quantities, as compared to other reactants, during the course of reactions.
From the equation of the reaction: [tex]4Fe + 3O_2 --- > 2Fe_2O_3[/tex]
The mole ratio of Fe to O2 is 4:3.
Thus, for 0.25 mol Fe, 0.25 x 3/4 = 0.1875 mol of O2 is required.
With 0.5 mol of O2 available, it means oxygen is in excess while Fe is limited in availability.
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The limiting reactant from the calculations is Fe.
What is the limiting reactant?The limiting reactant is the reactant that is present in the least amount in solution. Now we have the equation as; 4Fe+ 3O2 → 2Fe2O3
If 4 moles of Fe reacts with 3 moles of O2
0.25 mol of Fe reacts with 0.25 mol * 3 moles/4 moles
= 0.1875 moles of O2
It then follows that the limiting reactant is Fe.
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What component of NADH is a vitamin, and how does this part of the cofactor function in oxidation-reduction reactions
The Part of Nicotinamide Adenine Dinucleotide NADH that is a vitamin is niacin, a type of B vitamin.
This cofactor acts as a hydrogen acceptor in oxidation-reduction reactions.
What Is NADH?NADH is the reduced form of the NAD+, which means that it gains the electron lost by NAD+. NADH is a very important coenzyme central to metabolism.
NADH is a dinucloetide because it consists of two nucleotides joined through their phosphate groups.
One nucleotide contains an adenine nucleobase and the other nicotinamide.
What Is a Cofactor?
A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's role as a catalyst in a chemical reaction. A cofactor binds to an enzyme to bring about its catalytic reaction.
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The heat of combustion for the combustion of propane, c3h8 5o2 3co2 4h2o , is equal to -2,200 kj. this is an example of a(n) _________ reaction.
Answer:
This is an example of an exothermic reaction.
Explanation:
When the heat of combustion is negative, the reaction is exothermic. This means the reaction releases heat as a product.
a student carried out a combustion reaction with methane (ch4) as the limiting reagent. a 12.0g quantity of methane was used, and the student collected 22.0g of carbon dioxide. what was the percent yield
The total percent yield:
After the combustion reaction with methane, the percent yield was 66.7%.
Combustion of Methane:
Methane produces a blue flame as it burns in the atmosphere.Methane burns in the presence of enough oxygen to produce carbon dioxide (CO₂) and water (H₂O). It creates a significant quantity of heat during combustion, making it an excellent fuel source.The other reactant, air's excess oxygen, is always present, making methane the limiting reactant. As a result, the amount of CH₄ burned will determine how much CO₂ and H₂O are produced.
The following chemical process produces carbon dioxide from methane:
CH₄ + 2O₂ ⇒ CO₂ + 2H₂O
Calculations:
1. Theoretical quantity of carbon dioxide:
All calculations will be based on the amount of methane because the problem specifies that it is the limiting reagent:
12.0g of CH₄ × (1 mol of CH₄/16g CH₄) × (1 mole of CO₂/1 mole of CH₄) × (44g CO₂/1 mole of CO₂)
= 33g of CO₂
2. Percent yield:
= Actual yield/Theoretical yield × 100
= 22.0g/33g × 100
= 66.7%
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A steel cylinder contains a mixture of nitrogen, oxygen, and carbon dioxide gases. The total pressure in the tank is 2710 torr. The pressure exerted by the nitrogen and oxygen is 930 and 850 torr, respectively. What is the partial pressure in torr of the carbon dioxide in the mixture
A steel cylinder contains a mixture of nitrogen, oxygen, and carbon dioxide gases. The total pressure in the tank is 2710 torr. The pressure exerted by the nitrogen and oxygen is 930 and 850 torr, respectively. 27.1 torr is the partial pressure of the carbon dioxide in the mixture.
What is Dalton's Law of Partial Pressure ?Dalton's Law of partial pressure states that the total pressure exerted by non reacting gaseous mixture at a constant temperature and given volume is equal to the sum of partial pressure of all gases.
It is expressed as:
[tex]P_{A} = X_{A} P_{T}[/tex]
where,
[tex]P_{A}[/tex] = Partial pressure of gas A
[tex]X_{A}[/tex] = Mole fraction of gas A
[tex]P_{T}[/tex] = Total pressure
Mole Fraction of Nitrogen
= [tex]\frac{930}{930 + 850}[/tex]
= 0.52
Mole Fraction of Oxygen
= [tex]\frac{850}{850 + 930}[/tex]
= 0.47
Now,
Mole fraction of nitrogen + Mole fraction of oxygen + Mole fraction of carbon dioxide = 1
⇒ 0.52 + 0.47 + Mole fraction of carbon dioxide = 1
⇒ 0.99 + Mole fraction of carbon dioxide = 1
⇒ Mole fraction of carbon dioxide = 1 - 0.99
⇒ Mole fraction of carbon dioxide = 0.01
Now put the value in above expression we get
[tex]P_{A} = X_{A} P_{T}[/tex]
= 0.01 × 2710
= 27.1 torr
Thus from the above conclusion we can say that A steel cylinder contains a mixture of nitrogen, oxygen, and carbon dioxide gases. The total pressure in the tank is 2710 torr. The pressure exerted by the nitrogen and oxygen is 930 and 850 torr, respectively. 27.1 torr is the partial pressure of the carbon dioxide in the mixture.
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What is the molar solubility of AgCl in a 0.050 M NaCl solution? The Ksp of AgCl is 1.6 x 10-10. (Assume that the contribution of [Cl-] from AgCl is negligible relative to the [Cl-] from NaCl)
The molar solubility of AgCl:
The molar solubility of AgCl in a 0.050 M NaCl solution is 8 x [tex]10^{-8}[/tex] M [tex]Ag^{+}[/tex]
What is solubility?
The solubility is the quantity of reagent required to saturate the solution or bring about the dissociation reaction's equilibrium.
Reaction:
The dissociation reaction of AgCl in water is:
[tex]AgCl[/tex] ⇄ [tex]Ag^{+} + Cl^{-}[/tex]
Each mole of AgCl that dissolves in this reaction yields 1 mole of both [tex]Ag^{+}[/tex] and [tex]Cl^{-}[/tex]. The concentration of either the Ag or Cl ions would then be equal to the solubility.
Solubility= [[tex]Ag^{+}[/tex]] = [[tex]Cl^{-}[/tex]]
Calculation:
in 0.050 M NaCl, the [[tex]Cl^{-}[/tex]] = 1 x [tex]10^{-2}[/tex]
ksp = [[tex]Ag^{+}[/tex]] x [[tex]Cl^{-}[/tex]]
1.6 x [tex]10^{-10}[/tex] = [[tex]Ag{+}[/tex]] x ( 5 x [tex]10^{-2}[/tex])
[[tex]Ag^{+}[/tex]] = 5 x [tex]10^{+2}[/tex] x 1.6 x [tex]10^{-10}[/tex]
[[tex]Ag^{+}[/tex]] = 5 x 1.6 x [tex]10^{-10+2}[/tex]
[[tex]Ag^{+}[/tex]] = 8 x [tex]10^{-8}[/tex] M
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A gas has experienced a small increase in volume but has maintained the same pressure and number of moles. According to the ideal gas law, how has the temperature of the gas changed?
It has increased two times.
It has increased slightly.
It has decreased slightly.
It has stayed the same
According to the ideal gas law, if the volume experienced a small increase, the temperature increases slightly as well. (It has increased slightly.)
What is the ideal gas equation?It is an equation that relates the pressure (P), volume (V), number of moles (n) and temperature (T) of an ideal gas.
Let's consider the ideal gas law.
P × V = n × R × TA
T = P × V / n × R
According to the expression above, there is a direct relationship between volume and temperature. Thus, if the volume experienced a small increase, the temperature increases slightly as well.
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Given that the initial rate constant is 0.0110s−1 at an initial temperature of 21 ∘C , what would the rate constant be at a temperature of 150. ∘C for the same reaction described in Part A?
Part A said: The activation energy of a certain reaction is 45.5 kJ/mol . At 21 ∘C , the rate constant is 0.0110s−1 . At what temperature in degrees Celsius would this reaction go twice as fast?
T2= 32 degrees
The rate of reaction at 150 degrees is 1.878.
What is the activation energy?We have the formula as;
ln(k2/k1) = Ea/R (1/T1 - 1/T2)
ln(2( 0.0110)/0.0110) = 45.5 * 10^3/8.314(1/294 - 1/T2)
0.693 = 5473(1/294 - 1/T2)
0.693/ 5473 = (1/294 - 1/T2)
1.27 * 10^-4 = 1/294
1/T2 = 1/294 - 1.27 * 10^-4
1/T2 = 340 * 10^-4 - 1.27 * 10^-4
T2 = 30 degrees
Again;
ln(k2/0.0110) = 45.5 * 10^3/8.314(1/303 - 1/423)
ln(k2/0.0110) = 5473(3.3 * 10^3 - 2.36 * 10^3)
ln(k2/0.0110) = 5.14
k2/0.0110 = e^5.14
k2 = 0.0110 * e^5.14
k2 = 1.878
The temperature that the reaction will go twice as fast is 30 degrees while the rate construction at 150 degrees is 1.878.
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50.) a 26 m tall statue of buddha in tibet is covered with 279 kg of gold. if the gold
was applied to a thickness of 0.0015 mm, what surface area (in square units) was
covered? [gold's density is 19,320 kg/m?]
The surface area of the statute covered with the gold is 9,627.32 m².
What is Volume?
Volume is a scalar quantity expressing the amount of three-dimensional space enclosed by a closed surface.
Volume of the statute covered with gold
The volume of the statute covered with gold is calculated as follows;
Volume = mass/density
Volume = (279 kg) / (19,320 kg/m³)
Volume = 0.0144 m³
Surface area of the statute covered with goldThe surface area of a solid object is a measure of the total area that the surface of the object occupies.
V = S.A x h
where;
S.A is surface areah is thicknessS.A = V/h
S.A = (0.0144) / (0.0015 x 10⁻³)
S.A = 9,627.32 m²
Thus, the surface area of the statute covered with the gold is 9,627.32 m².
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Which law relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions?
Boyle’s law
Charles’s law
ideal gas law
combined gas law
The law that relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions is ideal gas law (option C).
What is ideal gas law?Ideal gas law in physics refers to the equation of state of an ideal gas. The law equation is as follows:
PV = nRT
Where;
P = pressureV = volumen = number of molesT = temperatureR = gas law constantTherefore, it can be said that the law that relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions is ideal gas law.
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Answer:
C. Ideal Gas Law
Explanation:
edge ;)
A sample of gas has a temperature of 25 oc and a volume of 122 ml. if the volume is decreased to 50 ml, what is the new temperature?
Answer:
10.2 °C
Explanation:
If all other variables are held constant, you can find the new temperature using the Charles' Law equation. The equation looks like this:
V₁ / T₁ = V₂ / T₂
In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can find the new temperature by plugging the given values into the equation and simplifying.
V₁ = 122 mL V₂ = 50 mL
T₁ = 25 °C T₂ = ? °C
V₁ / T₁ = V₂ / T₂ <----- Charles' Law equation
122 mL / 25 °C = 50 mL / T₂ <----- Insert values
4.88 = 50 mL / T₂ <----- Divide 25 from 122
4.88 x T₂ = 50 mL <----- Multiply both sides by T₂
T₂ = 10.2 °C <----- Divide both sides by 4.88
With a good mask-to-face seal and an oxygen flow rate of 15 L/min, the nonrebreathing mask is capable of delivering up to ______% inspired oxygen.
With a good mask-to-face seal and an oxygen flow rate of 15 L/min, the nonrebreathing mask is capable of delivering up to 90% inspired oxygen.
What is fraction of inspired oxygen?FiO2 is the fraction of inspired oxygen which is explained as the concentration of oxygen inhaled by a person.
Non breather mask:It delivers a high concentration of oxygen. Hence the liter flow will be 8-15L/min with the percentage of oxygen between 60-90%.
The liter flow of nonbreathing mask must not be less than 8L/min.
From the above information we can conclude that the fraction of inspired oxygen for a nonbreathing mask is 90%
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The concentration of hydroxide ion in an aqueous solution at 25°c is 3. 6 × 10⁻⁴ m. What is the concentration of the hydronium ion?.
Concentration of hydronium ion is 2.8 x 10⁻¹¹ M.
Calculation:
Given,
[OH⁻] = 3.6 x 10⁻⁴ M (concentration of hydroxide ion)
To find,
[H₃O⁺] =? (concentration of hydronium ion)
We know the relation that,
[H₃O⁺] x [OH⁻] = Kw
where,
Kw is the ionic constant of water at 25°C
Kw = 1 x 10⁻¹⁴
Substituting the known concentration of [OH-], we can find the concentration of [H3O+],
[H₃O⁺][3.6 x 10⁻⁴] = 1 x 10⁻¹⁴
[H₃O⁺] = 1 x 10⁻¹⁴/ 3.6 x 10⁻⁴
[H₃O⁺] = 2.8 x 10⁻¹¹ M
Therefore, the concentration of hydronium ion is 2.8 x 10⁻¹¹ M.
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Consider the reaction: icl(g) cl₂(g) → icl₃(s). the ∆g(f)° of icl(g) is -5.5 kj/mol and the ∆g(f)° of icl₃(s) is -22.59 kj/mol what is the ∆g° of the reaction, in kj/mol?
The ΔG° for the reaction in kJ/mol is -17.09.
Calculation,
The reaction is given below.
[tex]ICl(g)+Cl_{2} (g)[/tex] → [tex]ICl_{3} (s)[/tex]
The ΔG° for [tex]ICl(g)[/tex] = -5.5 kJ/mol
The ΔG° for [tex]ICl_{3} (s)[/tex] = -22.59 kJ/mol
The ΔG° for [tex]Cl_{2} (g)[/tex] = 0 kJ/mol ( change in gibb's free energy of standard state )
ΔG° for the reaction = ΔG° (product) - ΔG° (reactant)
ΔG° for the reaction = -22.59 kJ/mol - ( -5.5 kJ/mol + 0 kJ/mol )
ΔG° for the reaction = -17.09 kJ/mol
The value of change standard gibb's free energy for the standard state ( most stable form of elements) is zero.
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3H2 + blank, reaction arrow, 2NH3
How to complete the equation so that it is a Synthesis reaction
The complete equation representing the synthesis reaction for the formation of ammonia is: 3 H₂ + N₂ ⇒ 2 NH₃
What is a synthesis reaction?It is a reaction in which 2 or more substances combine to form 1 product.
Let's consider the following incomplete synthesis reaction.
3 H₂ + ____ ⇒ 2 NH₃
According to Lavoisier's law, the mass and the elements must be conserved in a chemical reaction. So, since there is nitrogen to the right, the missing element to the left must be nitrogen. Molecular nitrogen is diatomic.
The complete reaction is:
3 H₂ + N₂ ⇒ 2 NH₃
The complete equation representing the synthesis reaction for the formation of ammonia is: 3 H₂ + N₂ ⇒ 2 NH₃
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A sample of an unknown substance has a mass of 0. 465 kg. If 3,000. 0 j of heat is required to heat the substance from 50. 0°c to 100. 0°c, what is the specific heat of the substance? use q equals m c subscript p delta t.
Answer:
.129 J / g-C
Explanation:
specific heat = J / g-°C
= 3000 J / ( 465 g * 50C ) =.129 J /g-C
If sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. A solution of sucrose at room temperature does not readily decompose to form a solution of simple sugars because
The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose because the activation energy of the reaction is high.
Hence, Option (B) is correct answer.
What is Activation Energy ?The minimum amount of energy that must be provided by a reacting molecules to get converted into the product is called Activation energy.
It is expressed as:
[tex]k = Ae^{\frac{-E_a}{RT}}[/tex]
where,
k = rate constant
A = pre-exponential factor
Eₐ = activation energy
R = universal gas constant
T = absolute temperature in K
Thus from the above conclusion we can say that The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose because the activation energy of the reaction is high.
Hence, Option (B) is correct answer.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. Why?
A. The change in free energy of the reaction is positive.
B. The activation energy of the reaction is high.
C. The change in free energy of the reaction is negative.
D. This is a hydrolysis reaction, so it requires an input of energy.
E. The free energy of the products is higher than the free energy of the reactants.
If the prefix hydro were used to name a ternary acid, what problem would this create when naming chloric acid
Hydrochloric acid is a different kind of acid than chloric acid.
Ternary Acids (Oxy-acids) Ternary acids are also referred to as “Oxy-acids. Include hydrogen and oxygen and yet another (normally) nonmetallic detail. Those acids comprise each hydrogen and oxygen but their names make no reference to either hydrogen or oxygen.
A ternary acid is an acid that has the elements hydrogen and oxygen together with every other element, frequently a nonmetal. Or, they comprise hydrogen in addition to a polyatomic ion. An -ate complicated ion is named an -ic acid. as an example, HClO3(aq) consists of the chlorate ion and is known as chloric acid.
A binary acid is an acidic compound that always has hydrogen boned to every other chemical element, most of the time a nonmetal. Ternary acids are acidic compounds that comprise hydrogen and oxygen blended with some other detail. Binary acid has one style of a chemical element (hydrogen bonded to a nonmetal) .
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For the calculating change in pH question, some of the volumes of acid required were very very small. The smallest volume that can be reasonably transferred with pipetteman is 2 microliters (2 x 106 liters) If the volume of acid that needs to be added is so small that there is no equipment available to measure and transfer the correct volume of acid, what could be done to successfully adjust the pH? a) Use a less concentrated acid to adjust the pH so the required volume would be larger b) Use a more concentrated acid to adjust the pH so the required volume would be larger c) Use a less concentrated acid to adjust the pH so the required volume would be smaller d) Use a more concentrated acid to adjust the pH so the required volume would be smaller
To successfully adjust the pH, as there was no equipment to measure and transfer the correct volume of acid, then A. Use a less concentrated acid to adjust the pH so the required volume would be larger.
What is an acid?This is a substance that changes the taste in water solution and changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis).
Hence because there was no equipment available to measure and transfer the correct volume of acid, the best and safest and most successful thing to be done is to use a less concentrated acid to adjust the pH so the required volume would be larger.
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Approximately how long would the entire nucleosynthesis event take tofinish in the early universe?
Because of the very short period in which nucleosynthesis occurred before it was stopped by expansion and cooling (about 20 minutes), no elements heavier than beryllium (or possibly boron) could be formed.
Big Bang nucleosynthesis occurred inside the first three minutes of the start of the universe and is chargeable for an awful lot of the abundance of H (protium), H (D, deuterium), He (helium-three), and He (helium-4).
Although He remains produced by stellar fusion and alpha decays and hint quantities of H remain produced by way of spallation and certain sorts of radioactive decay, most of the mass of the isotopes inside the universe is thought to be produced in the Big Bang.
The nuclei of these elements, together with a few Li and Be are taken into consideration to have been fashioned between 100 and 300 seconds after the Big Bang whilst the primordial quark-gluon plasma froze out to form protons and neutrons.
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Which statement is true about word equations with regards to chemical reactions?
The total mass of the reactants equals the total mass of the products
A technologist is creating a solution that contains 25.5 grams of NaOH that is dissolved in 1 L of laboratory grade water. What is the molarity of the solution that the technologist created
Answer:
0.638 M NaOH
Explanation:
To find the molarity of the solution, you need to (1) convert grams NaOH to moles NaOH (via the molar mass of NaOH) and then (2) calculate the molarity (via the molarity formula). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator).
(Step 1)
Molar Mass (NaOH): 22.990 g/mol + 15.998 g/mol + 1.008 g/mol
Molar Mass (NaOH): 39.996 g/mol
25.5 grams NaOH 1 mole
----------------------------- x ---------------------------- = 0.638 moles NaOH
39.996 grams
(Step 2)
Molarity = moles / volume (L)
Molarity = 0.638 moles / 1 L
Molarity = 0.638 M
A 2 kg cat is stuck in a tree 10 m above the ground. How much GPE does it have?
A. 250 J
B. 150 J
C. 200 J
D. 20 J
Answer:
196J, but C. at 200 J comes close.
Explanation:
Potential energy due to gravity is given by:
PEgrav = mass • g • height
where g is the acceleration due to gravity. We'll use 9.8 N/kg (on Earth).
PEgrav = mass • g • height
PEgrav = (2 kg) • (9.8 N/kg) • (10 m)
PEgrav = 196 N*m
1 N*m = 1 Joule
PEgrav = 196 J
C. at 200 J comes close. The solution probably used a value of g equal to 10 N/kg)
Answer:
20 J
Explanation: