Familiar substances that sublime readily include iodine , dry ice , menthol, and camphor. Sublimation is occasionally used in the laboratory as a method for purification of solids, for example, with caffeine.
7. How does deforestation increase the level of carbon dioxide in the atmosphere? (Select all that apply.)
increasing ozone in the atmosphere by decreasing the rate of photosynthesis
decreasing the rate of photosynthesis by removing trees
Smoke from tree-clearing equipment adds large amounts of carbon dioxide to the atmosphere.
burning trees, releasing more carbon dioxide into the atmosphere
Deforestation increases the level of carbon dioxide in the atmosphere by decreasing the rate of photosynthesis (i.e., by removing trees).
What is deforestation?Deforestation refers to the removal of trees in a given ecosystem (e.g. a particular forest biome).
Thus practice (deforestation) is well known to increase the levels of carbon dioxide and global warming.
In conclusion, deforestation increases the level of carbon dioxide in the atmosphere by decreasing the rate of photosynthesis (i.e., by removing trees).
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After learning about climate change in her science class, selena wants to make a few changes at home so she can affect climate change in a small way. which changes will give her the best results?
Selena can change from burning fossil fuel in her home to using solar energy.
What causes climate changes?Climate change is caused by the release of the greenhouse gases which is gotten through the use and burning of fossil fuels such as coal.
The use of solar panels and solar energy by Selena in her house can help adjust the climate changes by decreasing the amount of greenhouse gases released into the atmosphere.
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The theoretical yield of zinc oxide in a reaction is 486 g. what is the percent
yield if 399 g is produced?
a. 29.6%
b. 4.93%
c. 82.1%
d. 122%
82.09% is the percent yield if 399 g is produced. Hence, option C is correct.
What is the percent yield?Percent yield is the percent ratio of actual yield to the theoretical yield.
Given data:
Actual yield = 399 g
Theoretical yield = 486 g
%Yield = [tex]\frac{Actual \;Yield \;X \;100 }{Theoretical \;Yield}[/tex]
%Yield = [tex]\frac{399 gX \;100 }{486 g \;Yield}[/tex]
= 82.09%
82.09% is the percent yield if 399 g is produced.
Hence, option C is correct.
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What is the missing word in this word equation? acid + alkali → __________ + water
⇒Answer:
acid + alkali → salt + water
⇒Explanation:
The acid and alkali neutralize each other to create salt and water. Different acids produce different salts.
Sulphuric acid creates Sulphate salts.
Nitric acid creates Nitrate salts.
Hydrochloric acid creates Chloride salts.
The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.
What is Neutralization Reaction ?A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.
In a neutralization reaction, there is a combination of H⁺ ions and OH⁻ ions which form water.
Therefore, The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.
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Calculate the speed of light in an unknown substance whose index of refraction is 1.65. Would you expect the light to bend toward the normal or away from the normal when it passes from air into the substance?
(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.
(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
What is the speed of light?The speed of light passing from air into the substance is calculated as follows;
refractive index = speed of light in air / speed of light in the substance
speed of light in the substance = speed of light in air/refractive index
speed of light in the substance = (3 x 10⁸) / (1.65)
speed of light in the substance = 1.82 x 10⁸ m/s
Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
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Strong acids and strong alkalis are.......
Able to turn blue litmus paper red
Corrosive and/or caustic
Sour
Sweet
Which of the following pH numbers indicates a strong acid?
1
5
7
14
What is the fundamental difference between covalent and ionic bonding?.
Answer:
An ionic bond essentially donates an electron to the other atom participating in the bond, while electrons in a covalent bond are shared equally between the atoms.
if 4.50 mol of ethane, c_(2)h_(6),undergo combustion according to the equation below , how many moles of oxygen are required? 2C_(2)H_(6)+7O_(2 )->4CO_(2)+6H_(2)O
15.75 moles of oxygen is required for 4.5 mole of ethane.
What is a Combustion Reaction ?The reaction in which a fuel gets oxidized by an oxidizing agent is called a Combustion Reaction , releasing a large amount of energy is called Combustion Reaction.
It is given in the question that
4.50 mole of ethane undergoes Combustion
2C₂H₆ + 7O₂ -> 4CO₂ +6H₂O
Mole fraction of ethane to oxygen is 2:7
Moles of ethane = 4.5
4.5 /x = 2/7
4.5 * 7 / 2 = x
x = 15.75 moles.
Therefore 15.75 moles of oxygen is required for 4.5 mole of ethane.
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A wave is created by causing vibrations in particles of matter. Which
statement about the wave is true?
The wave which is created by causing vibrations in particles of matter is a mechanical wave.
What is a wave?A wave is a disturbance in a medium which transmits transmits energy from one point to another without a permanent displacement of the particles of the medium.
Types of waves include:
electromagnetic wavesmechanical wavesMechanical waves are waves which are produced as a result of the vibrations of the particles of the medium.
Therefore, the wave which is created by causing vibrations in particles of matter is a mechanical wave.
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What is the concentration of hydronium and hydroxide ions in pure water at 25°c.
Explanation:
The concentration of hydronium and hydroxide ions are equal in pure water at 25 degree Celsius. Bringing the pH of pure water to be 7.This diagram shows the basis for forming which of the following
Proteins
Polysaccharide
Nucleus acids
Lipids
(I didn't have this as a question on any of my quizzes, but I will try my best. I wish you luck!)
Answer: Proteins
This is a peptide bond, which is a bond that forms between two amino acids through a condensation reaction. Amino acids make proteins.
Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of h2c2o4 and h2o in the balanced reaction? mno4⁻(aq) h2c2o4(aq) → mn2 (aq) co2(g)
The balanced redox reaction, if it occurs in acidic solution, is
5C₂O₄²⁻(aq) + 2MnO₄⁻(aq) + 16H⁺-----> 10CO₂(g) + 2Mn²⁺(aq) + 8H₂O(l)
What are redox reaction?Redox reactions are those in which loss and again of electrons occur.
To balance the redox reaction, we must first break the whole reaction into half equations;
Oxidation half equation
[tex]\rm 5C_2O4^2^-(aq) + 10e + 8H^+----- > 10CO_2(g) + 4H_2O(l)[/tex]
Reduction half equation
[tex]\rm 2MnO_4^- (aq) + 10e + 8H^+----- > 2Mn^2+(aq) + 4H_2O(l)[/tex]
Now combine both the reactions
[tex]\rm 5C_2O_4^2-(aq) + 2MnO4^- (aq) + 16H^+----- > 10CO_2(g) + 2Mn^2+(aq) + 8H_2O(l)[/tex]
Thus, the coefficient of H₂C₂O₄ is 5 and that of water is 8.
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Which is the electron configuration for zinc?
O 1s²2s²2p 3s²3p64s²3d³
O 1s22s22p 3s23p64s¹3d¹0
O 1s22s22p53s23p64s²3d¹0
O 1s²2s²2p 3s23p64s²3d¹0
The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex]. Hence, option D is correct.
What is an electron configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
The atomic number of zinc is 30 therefore The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex].
In simpler form expressed as [Ar] [tex]3d^10 4s^2[/tex]. The electronic configuration shows the distribution of the electrons of an atom or a molecule.
Hence, option D is correct.
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Avogadro’s number is the number of particles in one mole of a pure substance, true or false?
Answer: The answer is true.
Explanation: Avogadro's number is a mole, which concludes that this statement is true.
Which missing item would complete this alpha decay reaction?
Answer:
option c is correct answer.
during alpha decay mass of daughter atom is 4 unit less than its parent atom and its atomic number is 2 unit less than its parent atom.
[tex]\sf so , \: ^4 _2 He \: atom \: is \: released .[/tex]
Therefore, option c is answer.
An alkene X undergoes ozonolysis and gives two compounds Y and Z of molecular formula CHO. Y and Z. are functional isomers of each other Write the two-steps chemical equation for the conversion of X into Y and Z. 121 Write the structural formula of Y and 7. Why are they called functional isomers? [3] ili. What happens when hydrogen gas in the presence of nickel catalyst is passed over X? (1] TV. What is the application of ozonolysis in the organic reaction mechanism? 11 How can you prove chemically the compound X is unsaturated? [1]
The answers to the given questions are given below.
What is Ozonolysis ?A reaction done with Ozone to determine the position of C-C double bond in unsaturated Hydrocarbons.
It is given in the question
An alkene X undergoes ozonolysis and gives two compounds Y and Z of molecular formula CHO
Y and Z. are functional isomers of each other
The two-steps chemical equation for the conversion of X into Y and Z.[tex]\rm \\(CH_3)_2 -C= CH-CH_2-CH_3 + Zn - > CH_3 -CO-CH_3 + CH0-CH_2-CH_3\\\\Y \;is \;CH_3 -CO-CH_3 \\\\and \;Z \;is \;CHO-CH_2-CH_3[/tex]
Here X is 2 methyl pent-2 eneOn reaction with ozone , ozonide is formed[tex]\rm Y \;is \;CH_3 -CO-CH_3 \\\\and \;Z \;is \;CHO-CH_2-CH_3[/tex]
These are functional isomers as they have same molecular weight , but different functional groups.When hydrogen gas in the presence of nickel catalyst is passed over 2 methyl pent-2 eneA process called catalytic Hydrogenation will take place , and the alkene will get converted into alkane , 2-methyl pentaneThe ozonolysis process is useful in the pharmaceutical industry The unsaturation can be tested by bromine water testTo know more about Ozonolysis
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How many particles would be found in a 12.7g sample of ammonium carbonate?
answer choices are:
2.9 x 10^22 particles
7.96 x 10^22 particles
i cannot get it, please help
multiplying terrorist to power 23, divided by 96. Multiplied by 12.7. so this is 76.48
7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate. A particle is a tiny, localized item.
What is particles in chemistry?A particle is a tiny, localized item that may be defined by a number of physical or chemical characteristics, including volume, density, and mass. They range significantly in size or number from tiny particles like atoms to subatomic particles such as the electron.
Depending upon their density, particles can potentially be utilized to mimic even bigger things, such as moving celestial bodies or a throng of people. Although the meaning of the word particle is quite broad, different scientific disciplines might refine it as necessary. Any substance made up of particles is referred to as a particulate.
number of moles = given mass/ molar mass
= 12.7/ 96.08
= 0.13moles
number of particle= 0.13 × 6.022×10²³
= 7.96 x 10²²
Therefore, 7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate.
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Having problems figuring out molar mass in general. steps would be most appreciated.
Answer:
The periodic table
Explanation:
As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.
When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.
example. Find the molar mass of
H₂SO₄
Hydrogen (2) + sulphur (1) +oxygen (4)
= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)
=1(2) + 32(1)+16(4)
=2+32+64
=98
N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript
PLS PLS PLS ANSWER THIS ASAP. THISIS DUE IN MINUTES AND I'M FREAKING OUT!!!!!!!!!!!!!!!! I NEED THE WHOLE THING NOT JUST ONE ANSWER. THIS IS WORTH 30% OF MY GRADE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Energy transformations are the processes by which one form of energy is converted to another form.
What are energy transformations?Energy transformations refers to the various ways in which different forms of energy are interconverted.
The given energy transformations are as follows:
Microwaving popcorn: electromagnetic energy to thermal energyWater flowing over a waterfall: potential energy to kinetic energyEating an apple: chemical energy to mechanical energyUsing an iron: electrical energy to heat energyTurning on a car: chemical energy to mechanical energyUsing a flashlight: chemical energy to light energyFireworks on the 4th of July: chemical energy to light energyTurning on the light: electrical energy to light energyPlaying the drum: mechanical energy to sound energyEating a snack before a run: chemical energy to potential energyMaking toast in the toaster: electrical energy to heat energyTurning on a car radio: electrical energy to soundThe Sun: nuclear energy to lightPlant photosynthesis: Light energy tp chemical energyTherefore, energy transformations are the processes by which one form of energy is converted to another form.
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Type the correct answer in each box.
Balance the chemical equation.
N₂O3-
N₂ +
0₂
The Balanced Reaction is 2N₂O₃⁻ -----> 2 N₂ + 3 0₂
What is a Balanced Reaction ?A reaction in which the number of atoms of each element in the reactant and the product are equal is called a Balanced Reaction .
It is given in the question:
To Balance the chemical equation.
N₂O₃⁻ -----> N₂ + 0₂
To balance the reaction , the number of molecules of each element , i.e. Nitrogen (N) and Oxygen (O) needs to be balanced
2N₂O₃⁻ -----> 2 N₂ + 3 0₂
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Which description best describes n in the ideal gas law equation? *
How hard the particles are pushing on something
How many particles of something there is
How hot/cold something is
How much space something takes up
8.3145 L kPa / K mol
Answer:
How Hot Or cold it is is how it may be perceived
If you took 800mg of aspirin tablet at 12:00pm and another 800mg tablet at 2pm, how many milligrams of aspirin are still in your system at 3pm? Aspirin has a t 1/2 of 1 hour.
How do silica levels differ between the North Atlantic and North Pacific oceans
Answer:
The highest biogenic silica accumulation rates in this area are observed in the South Atlantic, with values as large as 53 cm. kyr−1 during the last 18,000 yr. Further, extensive biogenic silica accumulation has been recorded in the deep-sea sediments of the Bering Sea, Sea of Okhotsk, and Subarctic North Pacific.
Explanation:
Select the correct answer. a student puts a glass of water in the freezer. later, he notices ice forming on the surface of the water. which property of water best explains why ice forms on its surface?
Imagine that you need to determine the molarity of a solution that you prepare by dissolving 11.0g of NaCl in exactly 100mL of solution. A. What info do you have B. What info do you need. C. Determine the molarity of the solution.
Answer:
A.) You have been given grams of NaCl (11.0 g) and the volume of the solution (100 mL).
B.) You need to determine the moles of NaCl and the volume of the solution in liters. To find the moles of NaCl , you need to know the molar mass of NaCl.
C.) 1.88 M
Explanation:
To find the molarity of the solution, you need to (1) convert mL to L (by dividing by 1,000), then (2) convert moles NaCl to grams (via molar mass from periodic table), then (3) plug the values into the molarity equation.
Volume = 100 mL / 1,000 = 0.100 L
Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl) = 58.44 g/mol
11.0 g NaCl 1 mole
----------------- x --------------- = 0.188 moles NaCl
58.44 g
Molarity = moles / volume
Molarity = 0.188 moles / 0.100 L
Molarity = 1.88 M
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Ammonium hydroxide, (NH4OH), is considered a weak base because...
Select one:
a. it produces few hydroxide ions in aqueous solution.
b. it produces few hydrogen ions in aqueous solution.
c. it does not conduct electricity in aqueous solution.
d. it will not take part in a neutralization reaction.
Ammonium hydroxide is considered a weak base because it produces few hydroxide ions in aqueous solution. (Option a)
Strength of electrolytesStrong electrolytes: are completely ionized in aqueous solution.Weak electrolytes: are partially ionized in aqueous solution.Let's consider the ionization of ammonium hydroxide, which is a weak base.
NH₄OH ⇄ NH₄⁺ + OH⁻
Why is it considered a weak base?
a. it produces few hydroxide ions in aqueous solution. Yes, since it dissociates partially.
b. it produces few hydrogen ions in aqueous solution. No, since it does not produce hydrogen ions.
c. it does not conduct electricity in aqueous solution. No, since it conducts electricity, although poorly.
d. it will not take part in a neutralization reaction. No, since it will be neutralized by acids.
Ammonium hydroxide is considered a weak base because it produces few hydroxide ions in aqueous solution.
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Which of the following is a negative aspect of nuclear fusion?
A. It requires a large amount of fuel.
OB. A meltdown would be more dangerous than a traditional nuclear meltdown.
OC. It is very expensive to develop.
D. It produces as much waste as nuclear fission.
Reset Selection
Answer:
(D) It is very expensive to develop.
Explanation:
There are currently no active fusion reactors because of not only the cost of development but more importantly the difficulty.
It is very expensive to develop. Hence, option C is correct.
What is nuclear fusion?Nuclear fusion involves the fusion of 2 smaller nuclei into bigger nuclei. Nuclear fission on the other hand involves the fission/splitting of a large radioactive nucleus into smaller nuclei which are comparatively stable.
A negative aspect of nuclear fusion is that there are currently no active fusion reactors because of not only the cost of development but more importantly the difficulty.
Hence, option C is correct.
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In order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent Choose... in an Erlenmeyer flask on a hot plate. Turn on the heat, starting at Choose... . Using a Choose... , add additional solvent from a second container on the heat source. Swirl the sample flask after each addition, and try to add Choose... in order to dissolve the solid.
In order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate.
What is recrystallization solvent?Recrystallization involves dissolving the material to be purified (the solute) in an appropriate hot solvent.
Recrystallization, also known as fractional crystallization, is a procedure for purifying an impure compound in a solvent.
The method of purification is based on the principle that the solubility of most solids increases with increased temperature. Small crystals may trap impurities.
Thus, in order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate. Turn on the heat, starting at a low setting and increasing gradually.
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Explain how the cohesive and adhesive properties of water are useful in maintaining various life processes.
Answer:
Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.
Explanation:
One in which no heat is allowed to flow into or out of the system?
A. isobaric process
B. adiabatic process
C. isochoric process
D. isothermal process