Answer: Formula:
pH=−log[H
+
]
when pH=4
[H
+
]=10
−pH
=10
−4
when pH=2
[H
+
]=10
−pH
=10
−2
What are slime Molds?
Answer:
Slime mold or slime mould is an informal name given to several kinds of unrelated eukaryotic organisms that can live freely as single cells, but can aggregate together to form multicellular reproductive structures. Slime molds were formerly classified as fungi but are no longer considered part of that kingdom.
Answer:
Molds to put slime in
Explanation:
A 0.250 g sample of impure sodium carbonate required 18.29ml of 0.1055M HCI in a titration to methyl orange end point. The
percent of Na2CO3 (FW 106 g/mol)in the sample.
Select one:
O a. 10.23%
O b. 42.91%
O c. 40.905%
O d. 20.46%
Answer:
a
Explanation:
The Atlantic ocean grows in size due to a
A. thrust boundary
(B. divergent boundary)
C. transform boundary
D. convergent boundary
Answer:
B. Divergent boundary
Hope this helps :)
Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain.If pentane (C5H12), hexane (C6H14), and hexanol (C6H13OH) are heated evenly at different altitudes.
Required:
Rank them according to the order in which you would expect them to begin boiling.
Answer:
Pentane » Hexane » Hexanol
Explanation:
Pentane and Hexane are simple molecular structured with discrete molecules having weak vanderwaals forces of attraction. But Hexane has high molecular mass than pentane hence pentane has lower boiling point than Hexane.
Hexanol has hydrogen bonds between highly electronegative oxygen atom and the hydrogen atom which break on high heat energy application hence it has high boiling point.
Observe the above circuit diagram, if the gap is filled with a plastic wire, will the bulb glow? Justify your answer
Answer:
YES THE BULB WILL GLOW.
Explanation:
BECAUSE THE CIRCUIT UPPER AREA IS MADE OF PLASTIC SO THE PLASTIC CONDUCTS THE ELECTRICITY SO THE BULB WILL GLOW.
Acts as the digestive system inside a cell. It helps to break down old or unneeded parts of the cell, and substances that have been brought into the cell from the outside. WHO I AM?
Answer:
I think it is enzymes
Explanation:
A mole of a substance has a mass in grams that is equal to the molecular mass. For example, a carbon atom has a mass of 12.01 u. A mole of carbon has a mass of 12.01 g. Based on their molecular masses, list the molar massof each substance:Fe2O3__________CO __________Fe __________CO2__________ slader
Answer:
M(Fe₂O₃) = 159.70 g/mol
M(CO) = 28.01 g/mol
M(Fe) = 55.85 g/mol
M(CO₂) = 44.01 g/mol
Explanation:
We can calculate the molar mass of a compound by summing the molar masses of the elements that form it.
Fe₂O₃
M(Fe₂O₃) = 2 × M(Fe) + 3 × M(O) = 2 × 55.85 g/mol + 3 × 16.00 g/mol = 159.70 g/mol
CO
M(CO) = 1 × M(C) + 1 × M(O) = 1 × 12.01 g/mol + 1 × 16.00 g/mol = 28.01 g/mol
Fe
M(Fe) = 1 × M(Fe) = 1 × 55.85 g/mol = 55.85 g/mol
CO₂
M(CO₂) = 1 × M(C) + 2 × M(O) = 1 × 12.01 g/mol + 2 × 16.00 g/mol = 44.01 g/mol
How much heat energy is required to boil 66.7 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.
Answer:
91.7 kJ
Explanation:
Step 1: Given data
Mass of ammonia (m): 66.7 gMolar heat of vaporization of ammonia (ΔH°vap): 23.4 kJ/molStep 2: Calculate the moles (n) corresponding to 66.7 g of ammonia
The molar mass of ammonia is 17.03 g/mol.
66.7 g × 1 mol/17.03 g = 3.92 mol
Step 3: Calculate the heat (Q) required to boil 3.92 moles of ammonia
We will use the following expression.
Q = ΔH°vap × n
Q = 23.4 kJ/mol × 3.92 mol = 91.7 kJ
Which chemical reaction is the slowest?
A. Cake rises as it cooks in the oven.
B. Drain cleaner fizzes up as it encounters blockages in a pipe.
C. Baking soda and vinegar react.
D. Milk turns sour.
WILL GIVE BRAINLIEST!!
Answer:
Milk turns sour
The chemical reaction or chemical change which is slowest is milk turning sour as it involves enzymatic actions which are slow reactions.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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A substance with a lower specific heat capacity would:
1. Heat up faster and cool down slower
2. Heat up faster and cool down faster
3. Heat up slower and cool down faster
4. Heat up slower and cool down slower
Answer:
i think 2
Explanation:
i only think 2 i only think
-. How many moles of Pb are contained in 2.49 x 1025 atoms Pb?
Answer: There are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.
Explanation:
According to the mole concept, 1 mole of every substance contains [tex]6.023 \times 10^{23}[/tex] atoms.
Hence, number of moles present in [tex]2.49 \times 10^{25}[/tex] atoms of Pb are as follows.
[tex]No. of moles = \frac{2.49 \times 10^{25}}{6.023 \times 10^{23}}\\= 4.13 \times 10^{-3} mol[/tex]
Thus, we can conclude that there are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.
Which of these choices is a benefit of international trade?
A. Loss of jobs in home country
O
B. Greater cost to transport goods
C. Fewer options for consumers
D. Lower cost for labor
The choice that is a benefit of international trade is Lower cost for labor.
When international trade is done especially if it is done in dollars then companies get more money and they have to pay less to the labours as per the own country's market. As rupees in India has lesser value than the dollars in USA that is why even some dollars are big amount of money in India. Company gets money in dollars but pay to the labours in rupees. This way it is very easy to the win the customers at lower price and also without any loss. International trade is used by a lot of fields in India now and also major in Ed tech.
International trade is the trade in which company from a particular country is providing services in the form of objects or knowledge to the other country.
Therefore, the choice that is a benefit of international trade is Lower cost for labor.
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What is the MOST LIKELY reason that they build these layers? A. Help them capture food because their calcium carbonate exterior keeps them from drying out in their specific environment. B. Help them capture food because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment. C. Protect them from predators because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment. D. Protect them from predators because their calcium carbonate exterior keeps them from drying out in their specific environment.
Answer:
C. Protect them from predators because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment.
Explanation:
They build layers to protect themselves from predators. Plus, I've seen this question and got it right.
How many grams of ethanol, C2H5OH, can be boiled with 843.2 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol.
Answer:
1.00 × 10³ g
Explanation:
Step 1: Given data
Provided heat (Q): 843.2 kJMolar heat of vaporization of ethanol (ΔH°vap): 38.6 kJ/molStep 2: Calculate the moles of ethanol vaporized
Vaporization is the passage of a substance from liquid to gas. We can calculate the number of moles (n) vaporized using the following expression.
Q = ΔH°vap × n
n = Q / ΔH°vap
n = 843.2 kJ / (38.6 kJ/mol) = 21.8 mol
Step 3: Calculate the mass corresponding to 21.8 moles of ethanol
The molar mass of ethanol is 46.07 g/mol.
21.8 mol × 46.07 g/mol = 1.00 × 10³ g
The conversion of the liquid into water vapor is called vaporization.
The correct answer to the question is [tex]1.00 * 10^3 g[/tex]
The data given in the question is as follows:-
Provided heat (Q): 843.2 kJ Molar heat of vaporization of ethanol (ΔH°vap): 38.6 kJ/molThe formula we will use to calculate the moles is as:-
[tex]Q = H^ovap* n\\n = \frac{Q}{H^ovap}\\n = \frac{843.2 kJ}{(38.6 kJ/mol)} \\\\= 21.8 mol[/tex]
To calculate the mass of the following is as follows:-
The molar mass of ethanol is 46.07 g/mol.
[tex]21.8 mol* 46.07 g/mol = 1.00 * 10^3 g[/tex]
Hence the correct answer is [tex]1.00 * 10^3 g[/tex].
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What eventually happens to gas if its pressureis increased?
Answer:
the rate increases
Explanation:
they are closer to each other, they will collide with each other more frequently and more successful collision
CAN U JUST HELP ME PLS I NEED DESPERATE HELP. HELPPPP JUST PLS DO, IF U DON’T KNOW DON’T ANSWER :/
Answer:
i gotcha
Explanation:
The combustion of 3.795 mg of liquid B, which contains only C, H, and O, with excess oxygen gave 9.708 mg of CO2 and 3.969 mg of H2O. In a molar mass determination, 0.205 g of B vaporized at 1.00atm and 200.0'C and occupied a volume of 89.8 mL. Derive the empirical formula, molar mass, and molecular formula of B and draw three plausible structures
Answer:
Explanation:
9.708 mg of CO₂ will contain 12 x 9.708 / 44 = 2.64 g of C .
3.969 mg of H₂O will contain 2 x 3.969 / 18 = .441 g of H .
mg of O in given liquid B = 3.795 - ( 2.64 + .441 ) = .714 mg
ratio of mg of C , H , O in the compound = 2.64 : .441 : .714
ratio of no of atoms of C , H , O in the compound
= 2.64 / 12 : .441 /1 : .714 / 16
= .22 : .44 : .0446
= .22 / .22 : .44 / .22 : .044 / .22
= 1 : 2 : .2
1 x 5 : 2 x 5 : .2 x 5
= 5 : 10 : 1
empirical formula of the compound = C₅H₁₀O
Volume of 89.8 mL at 1 .00 atm at 200⁰C
volume of gas at 1 atm and 0⁰C = 89.8 x 273 / 473 mL
= 51.83 mL
51.83 mL weighs .205 g
22400 mL will weigh .205 x 22400 / 51.83 g
= 88.6 g
So molecular weight = 88.6
Let molecular formula be (C₅H₁₀O)ₙ
molecular weight = n ( 5 x 12 + 10 + 16 )
= 86 n
86 n = 88.6
n = 1 approx
So molecular formula is same as empirical formula
C₅H₁₀O is molecular formula .
Intersystem crossing is: ____________. (18-13) a radiative transition between states with different spin. a nonradiative transition between the vibrational levels of the same electronic state. a nonradiative transition between states with the same spin. a nonradiative transition between states with different spin. a radiative transition between states with the same spin.
Answer:
a nonradiative transition between states with different spin.
Explanation:
In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.
Generally, matter exists in three (3) distinct or classical phases and these are; solid, liquid and gas.
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.
Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.
Hence, the internal arrangement of atoms in a mineral determines all of the physical properties of the mineral.
Intersystem crossing is a nonradiative transition between states with different spin. For example, a singly excited electronic state may transit into a triple excited state or a triple excited state to a single state, non radioactively.
How many liters of C3H6O are present in a sample weighing 25.6 grams?
To Find :
Number of moles of C₃H₆O present in a sample weighing 25.6 grams.
Solution :
Molecular mass of C₃H₆O is :
M = (6×12) + (6×1) + (16×1) grams
M = 94 grams/mol
We know, number of moles of 25.6 grams of C₃H₆O is :
[tex]n = \dfrac{Given \ Mass \ Of \ C_3H_6O }{Molar\ Mass \ Of \ C_3H_6O }\\\\n = \dfrac{25.6}{94}\ mole\\\\n = 0.27 \ mole[/tex]
Hence, this is the required solution.
True or False: Both molecules and compounds are pure substances.
Answer:
False
Explanation:
Hope this helps!
Answer:
True
Explanation:
It's because both compounds and elements are considered pure substances and a molecules is considered an element.
A helium balloon has a volume of 25 L when the pressure is 1.551 ATM and the temperature is 20°C. The balloon is cooled at a constant pressure until the temperature is -11°C. What is the volume of the balloon at this stage?
Answer:
The balloon is cooled at a constant pressure until the temperature is -11°C. What is the volume of the balloon at this stage?
Construction of a voltaic cell Consider a cobalt-silver voltaic cell that is constructed such that one half-cell consists of the cobalt, CoCo, electrode immersed in a Co(NO3)3Co(NO3)3 solution, and the other half-cell consists of the silver, AgAg, electrode immersed in a AgNO3AgNO3 solution. The two electrodes are connected by a copper wire. The CoCo electrode acts as the anode, and the AgAg electrode acts as the cathode. To maintain electric neutrality, you add a KNO3KNO3 salt bridge separating the two half-cells.
The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the anode for the cobalt-silver voltaic cell. Indicate the physical states of atoms and ions using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively.
Answer:
Co(s) ------> Co^3+(aq) + 3e
Explanation:
A voltaic cell produces energy by spontaneous chemical processes. A voltaic cell contains an anode and a cathode. Oxidation (electron loss) occurs at the anode while reduction (electron gain) occurs at the cathode.
For the cobalt-silver voltaic cell, the reaction equation of the cobalt and silver voltaic anode half cell is shown;
At the anode;
Co(s) ------> Co^3+(aq) + 3e
Note that the anode is the electrode where oxidation occurs hence electrons are lost at the anode.
Determine which base will work to deprotonate each compound in an acid/base extraction.
Benzene ring with a carboxylic acid on one carbon and a methyl ester group on the opposite carbon __________
Benzene ring with a three carbon chain attached to one carbon. At the other end of the three carbon chain is a hydroxyl group. ___________
Benzene ring with a hydroxyl group attached to one carbon and a tertbutyl group attached to the opposite carbon __________-
Answer:
A common method is to perform an acid-base reaction, which can ... acid is not particularly water-soluble due to its nonpolar aromatic ring, ... An acid-base extraction can be used to extract carboxylic acids from ... carbonic acid (H2CO3) can decompose to water and carbon dioxide gas.
Explanation:
The bases that will work to deprotonate the compounds are :
NaHCO₃ or NaOH.metal alkoxidesNaOHThe Benzene ring with carboxylic acid which is a weak acid can be deprotonated using NaOH or NaHCO₃ because of the weakness of the carboxylic acid.
Metal alkoxides like potassium tertiary butoxide can be used to deprotonate a Benzene ring with three carbon chain attached to a single carbon, and also containing a hydroxyl group is a very weak acid hence the use of Metal alkoxides.
Benzene ring with a hydroxyl group attached is also a weak acid just like the Benzene ring with carboxylic group hence it can also be deprotonated using NaOH
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2C How many valence electrons does the atom have? A. 1 C. 5 B. 3 D. 7 i need help.
Answer:
C
Explanation:
brainliest?
How many calories of energy are found in 8.3 grams or Fat? Every gram of fat
can produce 38 KJ of energy.
Answer: asd asd asd asdasdasdasd
1) 0.5 moles of sodium chloride is dissolved to make 0.05 liters of solution. 2) 734 grams of lithium sulfate are dissolved to make 2500 mL of solution. 3) a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water. 4) a solution that contains .500 mol HC2H3O2 in 0.125 kg H2O. 5) a solution that contains 63.0 g HNO3 in 0.500 kg H2O. 6) What mass of water must be used to dissolve 0.500 kg C2H5OH to prepare a 3.00 m solution
Answer:
1)Molarity of 0.5 Moles of Sodium Chloride in 0.05 Liters of solution is 10 M.
2)Molarity of 734 grams of lithium sulfate are dissolved to make 2500 mL of solution is 2.68 M.
3)Molarity of a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water is 2.77 M.
4)Molarity of a solution that contains .500 mol HC₂H₃O₂ in 0.125 kg H₂O is 4 M.
5)Molarity of a solution that contains 63.0 g HNO₃ in 0.500 kg H₂O is 2 M.
6)The mass of water required to form 3.0 M solution by dissolving 0.5kg of C₂H₅OH is 3.62 kg.
Explanation:
Molarity is given as
[tex]M=\dfrac{n}{V}[/tex]
Here
n is number of moles V is the volume of the solution in litersUsing this all the values are calculated as follows:
1)Molarity of 0.5 Moles of Sodium Chloride in 0.05 Liters of solution is
[tex]M=\dfrac{n}{V}\\M=\dfrac{0.5}{0.05}\\M=10[/tex]
So the molarity is 10 M.
2)Molarity of 734 grams of lithium sulfate are dissolved to make 2500 mL of solution is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of lithium sulphate is as follows:
[tex]MM of Li_2SO_4=2\times Li+S+4\times O\\MM of Li_2SO_4=2\times 7+32+4\times 16\\MM of Li_2SO_4=110[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{734}{110}\\n=6.67[/tex]
V is given as
[tex]V_{L}=\dfrac{V_{mL}}{1000}\\V_{L}=\dfrac{2500}{1000}\\V_{L}=2.5\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{6.67}{2.5}\\M=2.68\ M[/tex]
So the molarity is 2.68 M.
3)Molarity of a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of Sodium hydroxide is as follows:
[tex]MM of NaOH=Na+O+H\\MM of NaOH=23+16+1\\MM of NaOH=40[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{83}{40}\\n=2.075[/tex]
V is given as
[tex]V_{L}=\dfrac{V_{mL}}{1000}\\V_{L}=\dfrac{750}{1000}\\V_{L}=0.75\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{2.075}{0.75}\\M=2.77\ M[/tex]
So the molarity is 2.77 M.
4)Molarity of a solution that contains .500 mol HC₂H₃O₂ in 0.125 kg H₂O is
[tex]M=\dfrac{n}{V}[/tex]
V is given as
[tex]V_{L}=\dfrac{mass}{density}\\V_{L}=\dfrac{0.125}{1 kg/L}\\V_{L}=0.125\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{0.5}{0.125}\\M=4.0\ M[/tex]
So the molarity is 4.00 M.
5)Molarity of a solution that contains 63.0 g HNO₃ in 0.500 kg H₂O is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of HNO₃ is as follows:
[tex]MM of HNO_3=H+N+3\times O\\MM of HNO_3=1+14+3\times 16\\MM of HNO_3=63[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{63}{63}\\n=1.00[/tex]
V is given as
[tex]V_{L}=\dfrac{mass}{density}\\V_{L}=\dfrac{0.5}{1 kg/L}\\V_{L}=0.5\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{1}{0.5}\\M=2.00\ M[/tex]
So the molarity is 2.00 M.
6)Mass of water must be used to dissolve 0.500 kg C₂H₅OH to prepare a 3.00 m solution is calculated as follows
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of C₂H₅OH is as follows:
[tex]MM of C_2H_5OH=2\times C+6\times H+O\\MM of C_2H_5OH=2\times 12+6\times 1+16\\MM of C_2H_5OH=46[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{500}{46}\\n=10.87[/tex]
V required is given as
[tex]M=\dfrac{n}{V}\\V=\dfrac{n}{M}\\V=\dfrac{10.87}{3}\\V=3.62\ L[/tex]
So the mass of water is given as
[tex]mass=density\times Volume\\mass=1 kg/L \times 3.62 L\\mass=3.62\ kg[/tex]
So the mass of water required to form 3.0 M solution by dissolving 0.5kg of C₂H₅OH is 3.62 kg.
(07.01 LC)
Which of the following happens during an exothermic chemical change? (4 points)
Net energy increases.
Heat is absorbed.
Net energy remains constant.
Heat is released.
Answer:
heat is released
Explanation:
there is a release of energy to the surroundings resulting in a net decrease
Heat is released during an exothermic chemical change. Hence, option D is correct.
What is an exothermic reaction?The process in which energy is released where bonds are broken is an exothermic reaction.
For example, combustion is an exothermic reaction where initially energy input along with oxygen and wax react to give heat, carbon dioxide and water.
An exothermic reaction is a "reaction in which standard enthalpy change ΔH⚬ is negative." Exothermic reactions release heat and entail the replacement of weak bonds with a stronger bonds.
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Select the keyword or phrase that will best complete each sentence. A Claisen reaction is a nucleophilic ____________ in which an enolate is the nucleophile.
Answer:
Substitution.
Explanation:
Claisen reaction was first published in 1887 by a prominent German chemist known as Rainer Ludwig Claisen.
A Claisen reaction is a nucleophilic substitution in which an enolate is the nucleophile. It's typically a reaction of two molecules of an ester to form a β-keto ester, in the presence of an alkoxide base. Thus, a Claisen reaction is simply a characteristic condensation reaction of esters through a nucleophilic carbonyl substitution with an enolate such as a ketone enolate or an ester enolate.
Furthermore, a Claisen reaction results in the formation of a carbon-carbon bond in the presence of a strong base to yield a β-keto ester.
How much natural gas does Canada have in reserve?
Answer:
Explanation:Marketable and technically recoverable resources
Canada's natural gas reserves are estimated to be 1,383 trillion cubic feet, of which 542 trillion cubic feet is conventional gas, and the rest is unconventional including coal-bed methane, shale and tight gas.
Which of the following describes the location of the polar climate zone? (2 points)
Group of answer choices
Between the tropical and the temperate zones
Closest to the equator
Farthest from the equator
Near the North Pole and South Pole
Answer:
Which of the following describes the location of the polar climate zone? Near the North Pole and South Pole.