Answers
Answer:
A. Biosphere to Geosphere.
Related Questions
Draw the curved arrow mechanism for the reaction between (2R,3R)-3,5-dimethylhexan-2-ol and PCl3.
Answers
Answer:
Sn2 mechanism
Explanation:
In this case, our nucleophile is the "OH" on (2R,3R)-3,5-dimethylhexan-2-ol. The alcohol group will attack the \(PCl_3\) to produce a new bond between O and P with a positive charge in the oxygen. Additionally, when the OH attacks a Br atom leaves the molecule producing a bromide ion.
In the next step, the bromide ion produced will attack the carbon bonded to the OH that now is bonded to \(PCl_2\). An Sn2 reaction takes place and the substitution would be made in only one step. Due to this, we will have an inversion in the stereochemistry and the absolute configuration on carbon 2 will change from "R" to "S" to produce (2S,3R)-2-bromo-3,5-dimethylhexane.
I hope it helps!
2.70mol Na and 2.40 mol Cl2 are placed in a container. They react to form NaCl. What is the limiting reactant?
Answers
The limiting reactant in the reaction between 2.70 mol Na and 2.40 mol Cl2 to form NaCl is Na.
To determine the limiting reactant in a chemical reaction, we need to compare the amount of each reactant with the stoichiometry of the reaction. The balanced chemical equation for the reaction between sodium (Na) and chlorine gas (Cl2) to form sodium chloride (NaCl) is:
2 Na + Cl2 → 2 NaCl
According to the equation, two moles of Na react with one mole of Cl2 to form two moles of NaCl. Therefore, to calculate the amount of NaCl that can be formed, we need to determine which reactant is present in the limiting amount.
The molar ratio of Na to Cl2 in the reaction is 2:1. Therefore, for every 2 moles of Na, we need 1 mole of Cl2 to react completely.
Starting with 2.70 mol of Na and 2.40 mol of Cl2, we can calculate the amount of NaCl that can be formed from each reactant:
Na: 2.70 mol Na x (2 mol NaCl/2 mol Na) = 2.70 mol NaCl
Cl2: 2.40 mol Cl2 x (2 mol NaCl/1 mol Cl2) = 4.80 mol NaCl
Comparing the amounts of NaCl that can be formed from each reactant, we can see that the amount of NaCl formed by the reaction with Na is 2.70 mol, while the amount of NaCl formed by the reaction with Cl2 is 4.80 mol. Therefore, the limiting reactant is Na, as all of the Na will react, but there will be some Cl2 left over.
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Which one of the following is an example of a covalent network solid?a.SiO2b. Kc. I2d. CaCl2e. None of these.
Answers
Answer:
SiO2
Explanation:
A covalent network solid is a solid substance held together by a network of covalent bonds. Silicon dioxide forms a three dimensional covalent network solid structure.
Silicon dioxide is comprised of a network in which each silicon atom is at the centre of a tetrahedron of four oxygen atoms. Each of the oxygen atoms is also bonded to another silicon atom, at the centre of its own tetrahedron of oxygen atoms. This gives rise to a crystalline solid structure which is hard, having a high melting point.
Question 20 of 66
Which of the following species has the same number of protons as Fe3+?
A) Mn3+
B) Co2+
C) Fe2+
D) Nit
E) CO3+
Answers
If you have any questions please let me know.
Fe²⁺ has the same number of protons as Fe³⁺.
In order to know the number of protons of a species, we need to look for the atomic number (Z) in the Periodic Table.
The atomic number of Fe is 26, so it has 26 protons. Since protons are in the nucleus, they are not lost nor gained. Fe³⁺ results from Fe losing 3 electrons, but it has 26 protons as well.
Taking this into account, let's consider the number of protons of the following species:
A) Mn³⁺. It has 25 protons like Mn (Z = 25).
B) Co²⁺. It has 27 protons like Co (Z = 27).
C) Fe²⁺. It has 26 protons like Fe (Z = 26).
D) Ni. It has 28 protons (Z = 28).
E) Co³⁺. It has 27 protons like Co (Z = 27).
Fe²⁺ has the same number of protons as Fe³⁺.
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Describe the process that causes mantle material to circulate.
Answers
Answer:
Heat from deep in the Earth/from Earths core.
Explanation:
Plates at our planet's surface move because of the intense heat in the Earth's core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. Convection is the heat-driven circulation of a fluid. In the mantle, heat from deeper in the Earth causes the overlying mantle to circulate. The mantle can circulate because it contains a little magma (molten rock); it behaves like a very hot mush. Mantle convection currents move very, very, slowly.
An aqueous solution with the label 0.25 M sucrose contains 0.25 grams of sucrose in every 1 L of solution. Compared to the pure solvent, the freezing point depression caused by adding 0.05 mol of sucrose to 1.0 L of water is greater than the boiling point elevation of the same solution. T/F
Answers
The freezing point depression caused by adding 0.05 mol of sucrose to 1.0 L of water is greater than the boiling point elevation of the same solution is True.
The boiling point goes up and the freezing point goes down. When a solute dissolves in a liquid solvent, it gives rise to the aggregate properties of the solution. Aggregate properties are properties of a solvent that change with the addition of solute particles.
The boiling point of the solution is higher than that of the pure solvent because the solution must be heated to a higher temperature so that the vapor pressure corresponds to the external pressure. The freezing point of a solution is lower than that of a pure solvent or solute. This is because coagulation or solidification creates order and reduces entropy.
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1.What happens when non-metals react with oxygen? (1 Point)
a) Metal oxides are formed.
b) Basic oxides are formed.
c) Acidic oxides are formed
Answers
Answer:
c)
Explanation:
acidic oxides are formed
metal oxides and basic oxides are basically the same.
1. A balloon is inflated to a pressure of 2.55 atm at a temperature of 25 °C. What temperature
(in °C) is required to maintain the same volume if the pressure decreases to 1.39 atm?
Answers
Answer :
-111°C
Hope it helps
The final temperature of the gas in the balloon is equal to -110.6°C.
What is Gay Lussac's law?Gay-Lussac's law can be described as when the volume of the gas is kept constant then the pressure (P) is directly proportional to the absolute temperature (T in kelvin) of the gas.
The mathematical representation of Gay Lussca's law can be written as follows:
P/T = k
The pressure (P) of a gas is always directly proportional to the temperature (T) of the gas.
P ∝ T (where volume is constant)
\(\frac{P_1}{T_1} =\frac{P_2}{T_2}\)
Where P₁, T₁, P₂, and T₂ are the initial and final pressure and temperature.
The initial temperature of the balloon, T₁ = 25 °C = 25 + 273 = 298 K
The initial pressure of the balloon, P₁ = 2.55 atm
The final pressure of the balloon, P₂ = 1.39 atm
Substituting temperatures and pressures of the gas in the balloon in the above equation:
2.55/298 = 1.39/T₂
T₂ = 162.4 K
T(K) = 273 + T(°C)
T(°C) = 162.4 - 273 = - 110.6°C
Therefore, the final temperature of the gas inside the balloon is -110.6°C.
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Which element or elements are unbalanced in this equation?
MgO + 2 LiCl → MgCl2 + Li2O
A) Cl
B) Mg
C) Li
D) All elements are balanced.
Answers
Answer:
The answer is A
Explanation:
I took the quiz
What is the volume of 1.2 moles of neon gas at STP
Answers
Answer:
26.9 L.
Explanation:
Hello there!
In this case, since the ideal gas equation is able to provide us the volume of neon in 1.2 moles by considering the STP conditions (1.00 atm and 273.15 K) via its mathematical definition:
\(PV=nRT\)
We first need to solve for V in the aforementioned equation:
\(V=\frac{nRT}{P}\)
So we plug in to obtain:
\(V=\frac{1.2mol*0.08206\frac{atm*L}{mol*K}*273.15K}{1.00atm}\\\\V=26.9L\)
Best regards!
What happens to the molecule If energy is removed from a substance
Answers
Answer:
Removing energy (cooling) atoms and molecules decreases their motion, resulting in a decrease in temperature
An atom with 19 protons and 18 neutrons is a(n)
A. Isotope of potassium(K)
B. Standard atom of argon(Ar)
C. Standard atom of (K)
D. Isotope of argon (Ar)
Answers
Answer:
A
Explanation:
The number of protons indicates the element so we know it's potassium. To get the number of neutrons you subtract the number of protons (19) from the mass number which for potassium is 39.
39-19=20 neutrons
Because you have 18 neutrons then yours would be an isotope.
Answer: A. Isotope of potassium(K)
Explanation: Founders Educere answer.
2 Points
Which element has the fewest valence electrons?
A. Magnesium (Mg)
B. Neon (Ne)
C. Chlorine (CI)
O D. Silicon (Si)
SUSNE
Answers
Answer:
A. Magnesium (Mg)Explanation:
As the elements go left in the periodic table, they have fewer valence electrons.
Magnesium has 2 valence electrons.
Neon has 8 valence electrons.
Chorine has 7 valence electrons.
Silicon has 4 valence electrons.
Magnesium has the fewest valence electrons.
Answer:
A
Explanation:
Magnesium
This problem has to be solved using algor mortis.
3. Approximately how long as the victim been dead if his body temperature was 85.2 F?
Answers
Answer:
The victim has been dead for approximately 12 hours.
Explanation:
Algor mortis, or the cooling of the body after death, is a reliable way to estimate time of death. The average body temperature is 98.6 degrees Fahrenheit, so 85.2 degrees Fahrenheit would be 12 hours after death.
Formula for zinc + nitric acid = zinc nitrate
Answers
Answer:
Zinc nitrate is an inorganic chemical compound with the formula Zn(NO3)2. This white, crystalline salt is highly deliquescent and is typically encountered as a hexahydrate Zn(NO3)2•6H2O. It is soluble in both water and alcohol.
Explanation:
correct me if im wrong please
Photoelectric effect will occur only if frequency of light striking an electron in a metal is above a certain threshold frequenci
Answers
The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.
The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.
The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.
This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.
Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.
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Do you think it's possible for someone to completely eliminate procrastination from their life? Why or why not
Answers
Answer:
No and Yes
Explanation:
This is both possible and impossible. When you put your mind to what you believe, you can achieve it through patience and minded values. Your mind can either be your Greatest enemy or your Best Ally.
Choose the phrases that you think of when you hear the word Sun. Check all that apply.
Answers
solution contains DNA polymerase and the Mg?+ salts of dATP; dGTP dCTP; and TTP: When added l0 aliquots of the solution which ol the following DNA molecules would lead t0 DNA synthesis? a double-stranded closed circle conlaining IO nucleotide pairs single-stranded closed circle containing IOO nuclectide units 4 double-stranded linear molecule o IOOD nucleotide pairs wilh Iree 3 ~OH group at each end 4 single-stranded closed circle ol IOOD nucleotides base-paired (0 & linear strand ol 500 nucleotides with freee' 3'OH lerminus Identily lhe reasons why the DNA molecule you selected would lead lo DNA synthesis: ATP supplies the energy required It is double-stranded DNA Ithas an available templale strand: l has primer with & free 3' OH group: Inconed
Answers
DNA synthesis requires a source of energy, which is provided by ATP. This source of energy is required to drive the formation of the phosphodiester bonds between nucleotides.
Solution contains DNA polymerase and the Mg salts of dATP; dGTP: dCTP; and TTP. When added l0 aliquots of the solution, DNA synthesis occurs in the following DNA molecule. The double-stranded linear molecule of IOOD nucleotide pairs with I free 3 ~OH group at each end would lead to DNA synthesis.
The reasons why the DNA molecule you selected would lead to DNA synthesis are given below:
DNA polymerase enzymes add nucleotides only to a 3-OH end of a pre-existing nucleic acid strand, extending the 3' end of the newly forming strand in a 5' to 3' direction. DNA synthesis proceeds only in a 5' to 3' direction. Double-stranded DNA is required for the formation of new double-stranded DNA. When DNA polymerase is bound to a single-stranded template, it will extend a complementary strand in a 5' to 3' direction. Both strands of the double-stranded DNA molecule serve as templates for DNA synthesis because they have the available template strand. Primer with a free 3' OH group is required to begin the synthesis of a new DNA strand.
DNA polymerase adds nucleotides to the 3' OH group of the primer. DNA synthesis requires a source of energy, which is provided by ATP. This source of energy is required to drive the formation of the phosphodiester bonds between nucleotides.
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Consider the following balanced reaction. How many grams of NO2 are produced using 250 mL of 2.6 M HNO3 solution? Assume that there is excess NO present.2 HNO3(aq) + NO(g) - 3 NO2(g) + H20(1)44.9 8O 11 gO 11.6 gO 45 g
Answers
Answer: 45g of NO2 are produced (third option or letter C).
Explanation:
The question requires us to calculate the amount of NO2, in grams, that would be obtained from 250 mL of 2.6 M HNO3 and excess of NO in the following chemical reaction:
\(2HNO_{3(aq)}+NO_{(g)}\rightarrow3NO_{2(g)}+H_2O_{(l)}\)To solve this problem, we must calculate the number of moles of HNO3 used, considering the volume and solution concentration given, then use the stoichiometry of the reaction to calculate the amount of moles of NO2 produced and, at last, use the molar mass of NO2 to convert the number of moles to mass.
Considering the definition of molarity, we can write:
\(molarity=\frac{number\text{ of moles }(mol)}{volume\text{ }(L)}\rightarrow number\text{ of moles }(mol)\text{ = molarity }(mol/L)\times volume\text{ }(L)\)Thus we need the volume of HNO3 solution used (250 mL = 0.250 L) and the molarity of the solution (2.6 M) to calculate the number of moles of HNO3 used in the reaction:
\(\begin{gathered} \begin{equation*} number\text{ of moles }(mol)\text{ = molarity }(mol/L)\times volume\text{ }(L) \end{equation*} \\ number\text{ of moles = }(2.6mol/L)\times(0.250L)=0.65mol \end{gathered}\)Therefore, 0.65 moles of HNO3 were used in the reaction.
Considering the stoichiometry of the reaction, given by the chemical equation, we can say that 2 moles of HNO3 are necessary to obtain 3 moles of NO2. Thus, we can write:
2 mol HNO3 --------------------- 3 mol NO2
0.65 mol HNO3 ---------------- x
Solving for x, we'll have:
\(x=\frac{(0.65mol\text{ HN}O_3)\times(3mol\text{ N}O_2)}{(2mol\text{ HN}O_3)}=0.98mol\text{ N}O_2\)Therefore, 0.98 moles of NO2 are obtained when 0.65 moles of HNO3 are used.
Next, we need to use the molar mass of NO2 (46.00 g/mol) to calculate the mass that corresponds to 0.98 moles of NO2:
1 mol NO2 ---------------- 46.00g NO2
0.98 mol NO2 ---------- y
Solving for y, we'll have:
\(y=\frac{(0.98mol\text{ N}O_2)\times(46.00g\text{ N}O_2)}{(1\text{ mol N}O_2)}=45g\text{ N}O_2\)Therefore, 0.98 moles of NO2 correspond to 45g of this compound.
The best option to answer this question is the third one (or letter C): 45g.
What is the mass of NaCl required to make 150 grams of a 12% solution of NaCl in water? (5 points)
a
13 grams
b
18 grams
c
22 grams
d
32 grams
Answers
Answer:
18 grams
Explanation:
Mass of solution = 150 g
Percent concentration = 12%
Percent concentration = mass of solute/mass of solution × 100
Let the mass of solute be x
12= x/150 × 100
12= 100x/150
12 × 150 =100x
x= 12 × 150/100
x = 18 g
Answer:
18
Explanation:
Mass of solution = 150 g
Percent concentration = 12%
Percent concentration = mass of solute/mass of solution × 100
Let the mass of solute be x
12= x/150 × 100
12= 100x/150
12 × 150 =100x
x= 12 × 150/100
x = 18 g
Reactions in our world: pre-lab activity worksheet
Answers
When iron ( Fe ) reacts with copper sulphate ( CuSO₄) , it forms ferrous sulphate ( FeSO₄ ) and copper ( Cu ) .
Iron copper sulphate.
The lead nitrate [Pb(NO₃)₂] reacts with potassium iodide (Kl) causing exchange of ions between the reactants leading to the formation of potassium nitrate (KNO₃) and a yellow precipitate of lead iodide (PbI₂).
Magnesium reacts with hydrochloric acid according to the equation
Mg + 2 HCl --> MgCl₂ + H₂
Magnesium reacts with hydrochloric acid according to the equation This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas.
H₂O
Water splitting is the process in which water decomposes into hydrogen and oxygen.
Mg + O₂ → MgO.
Magnesium reacts with Oxygen to form Magnesium oxide.
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Balance this equation Hgo —> Hg + O2
Answers
Answer:
2Hgo —>2Hg + O2
Explanation:
which is a positive aspect of fossil fuels? help now
Natural Resources Unit Test
4 of 164 of 16 Items
Question
Which is a positive aspect of fossil fuels?(1 point)
Responses
They can be recycled and reused.
They can be recycled and reused.
They provide energy for cars, trains, and heat.
They provide energy for cars, trains, and heat.
They are ecologically friendly.
They are ecologically friendly.
They do not need processing to produce energy.
They do not need processing to produce energy.
Answers
Positive aspect of fossil fuels is They provide energy for cars, trains and heat.
1) They can be recycled and reused . this point is wrong because fossil fuels are non renewable resources and are in limits in supply . so, fossil fuels cannot be recycled.
2) They provide energy for cars, trains, and heat. This is statement is true.
3) They are ecologically friendly. this statement is wrong. The fossil fuels are not eco-friendly . they produce the pollution to the environment and severely damage our environment.
4) They do not need processing to produce energy. they need geological process of millions years.
Thus, Positive aspect of fossil fuels is They provide energy for cars, trains and heat.
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Consider the following mechanism for the reaction between nitric oxide and ozone: (g) (g) (g) (g) (1) (g) (g) (g) (2) (g) (g) (g) (3) Write the chemical equation of the overall reaction: Are there any intermediates in this mechanism
Answers
Answer:
ggggg1ggg2gg
Explanation:
A 14.579 g sample of CaCl2 was added to 28.016 g of K2CO3 and mixed in water. A 3.558 g yield of CaCO3 was obtained.
What is the limiting reagent?
Answers
Answer:
CaCl3 is the limited reagent
Explanation:
What you see as you look up at the night sky depends on the weather, the time of year, your location, and how dark your surroundings are. The
---
and stars are the celestial objects most people can see in the night sky.
Answers
the [moon] and stars are what most people see.
For the reaction 2H₂(g) + O₂(g) → 2H₂O(g), what volume of water vapor can be made from 100 grams of oxygen gas and an excess of hydrogen at STP? Please show work.
Answers
Answer:
140 L
Explanation:
Step 1: Write the balanced equation
2 H₂(g) + O₂(g) → 2 H₂O(g)
Step 2: Calculate the moles corresponding to 100 g of oxygen
The molar mass of oxygen is 32.00 g/mol.
\(100g \times \frac{1mol}{32.00g} =3.13mol\)
Step 3: Calculate the moles of water vapor formed
The molar ratio of oxygen to water vapor is 1:2.
\(3.13molO_2 \times \frac{2molH_2O}{1molO_2} =6.26molH_2O\)
Step 4: Calculate the volume corresponding to 6.26 moles of water vapor
1 mole of any ideal gas under STP has a volume of 22.4 L.
\(6.26mol \times \frac{22.4L}{mol} =140 L\)
Please I need help thank you
Answers
Answer:
its sodium hydroxide
Explanation:
Predict the ground-state electron configuration of each ion. Use the abbreviated noble gas notation.
Cu²+
Co³ +
I got answers of:
Cu - [Ar]4s^2 3d^7 ; [Ar]3d^7 ; [Ar]3d^10 ; [Ar]4s^1 3d^10
Co - [Ar]4s^2 3d^4 ; [Ar]3d^4
And these were all wrong, please help
Answers
The electron configuration of Cu²+ ion - \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^9\)
The electron configuration of Co³ + ion - \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^6\)
What is the electron configuration?When we are talking about the electron configuration, we are talking about the way that the electron is arranged around the nucleus of the atom. We know that electrons in the atom can be arranged in energy levels in the atom of the element.
We are asked to write here the electron configuration of the copper II ion and that of the cobalt III ion. In either case, we have to know that electrons have been removed from the neutral atom. In the first case, there are two electrons that have been removed while in the second case, there are three electrons that have been removed.
Thus in writing the electron configuration of the specie we have to take into account the number of the electrons that have been lost due to ion formation. Recall that the ground state is the lowest energy state of the chemical specie.
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