Answer:
(A) Climate Change (B) Climate Change and Plant Communities (C) Effect on Sea Levels (D) Reduction of Biodiversity (E) Effect on Agriculture (F) Effect on Arctic Ecosystems (G) Overall Effect.
Explanation:The increase in temperature will be greatest at high latitudes and over large continents. Climatic changes as a result of global warming will naturally affect the biotic communities on this earth. Rising temperatures will cause glaciers to melt and the polar ice caps to shrink. As mentioned above increased temperatures, inundation of some coastal biological communities and changes in the pattern of distribution of many species over a long period of time are likely to cause reduction in biodiversity in aquatic and terrestrial ecosystems. The global climate change may have important effects on agriculture. Global climate change will have profound effects on arctic ecosystems. The overall effect of global warming on world climate has many dimensions, some of which are discussed above. The natural greenhouse maintains the earth’s temperatures within the limits for physiological functions. But studies suggest that even a moderate increase in the average global temperature could result in significant changes in biotic communities including reduction in biodiversity both in terrestrial and aquatic ecosystems.
Convert 477°C to degrees Fahrenheit.
Answer:
890.6
Explanation:
(477°C × 9/5) + 32 = 890.6°F
As of 2017, the tallest roller coaster in the world is the Kingda Ka, located at Six Flags Great Adventure in Jackson, New Jersey. It stands 139 meters tall and, at one point, the cars drop 127 meters! Roller coasters are a great way to investigate energy. Look at the diagram of a roller coaster below, and answer the following questions. At what point on the track does the car have the greatest potential energy?
Answer:
energy due to its velocity. We can compare potential and kinetic energy by considering a car on a hill. When the car is at the top of the hill it has the most potential energy.
What is the molecular formula of the product formed from the oxidation of 2-methyl-2,3-pentandiol with Jones reagent (CrO3, H , H2O)
Answer:
C6H12O2
Explanation:
The Jones reagent is a reagent in organic chemistry used to convert primary alcohols to carboxylic acids and secondary alcohols to ketones. Recall that tertiary alcohols can not be oxidized.
The compound 2-methyl-2,3-pentandiol contains one secondary and one tertiary alcohol. The secondary alcohol is oxidized to a ketone while the tertiary alcohol is not oxidized.
Hence the product of the oxidation using Jones reagent is 2-Hydroxy-2-methyl-3-pentanone with the molecular formula C6H12O2.
List five properties of the chair you are sitting on. Classify each as physical or chemical.
Answer:
Shapes suitable for humans to sit on it, three to four legs, a flat seat, and a back. Anything with such a shape is "chair", regardless of the peculiarities of its shape or its composition (what it is made of); anything without such a shape is a "not chair", even if you can sit on it. And a chair is classified as physical.
Explanation:
Advantages and disadvantages of Reversible Fuel Cell..
Answer:
Hydrogen fuel cells do not produce any CO2 emissions during operation, even if their production is not necessarily carbon-free. This gives them an advantage over combustion engine vehicles, which can emit small amounts of poisonous carbon monoxide and require well-ventilated rooms for indoor use.
What is Trinitrogen hexaflouride formula
Answer:
N3F6
Explanation:
Tri- means three so three nitrogens and hexa- means six so six flourines.
Nitrogen and fluorine forms covalent compounds. The formula of one of their compound trinitrogen hexaflouride is N₃F₆.
What is covalent compounds?Covalent compounds are formed by the sharing of electrons between two atoms. Atoms which are electron deficient forms covalent compounds. The number of shared electron is based on the valency of each bonded atom.
Nitrogen is 7th element in periodic table and it have five valence electrons. Thus it needs 3 more electrons to attain stability. Fluorine is 9th element with 7 electrons in its valence shell and it needs one more electron to gain stability.
In the compound trinitrogen hexafluoride, there are three nitrogens and six fluorine. Each nitrogen shares one electron with fluorine and each fluorine in turn shares its one electron. Thus the formula of the compound is N₃F₆.
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What is a combustion reaction?
Answer:
In a combustion reaction, a substance reacts with oxygen from the air. Combustion reactions happen at high temperatures, and transfer energy to the surroundings as light and heat. ... Since methane is made up of atoms of carbon and hydrogen, the products of its combustion reaction are oxides of carbon and hydrogen.
Explanation:
Enter a balanced nuclear equation for the production of lead-212, used in the treatment of some cancers, from the beta decay of thallium-212.
Answer:
[tex]\frac{212}{81}Tl ------>\beta + \frac{212}{82}Pb[/tex]
Explanation:
Beta emission involves the conversion of a neutron to a proton, an electron and a neutrino. This leads to a reduction in the neutron-proton ratio.
During a beta emission, the mass number of the parent and daughter nuclei remain the same. The atomic number of the daughter nucleus increases by one unit above that of the parent nucleus as we can see from the equation.
Hence, the daughter nucleus is found one place after its parent in the periodic table.
The balanced nuclear equation for the production of lead-212 will be:
[tex]^{212}Tl_{81}---->\beta + ^{212}Pb_{82}[/tex]
Beta decay:It is a type of radioactive decay in which a beta particle is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclideIt involves the conversion of a neutron to a proton, an electron and a neutrino. This leads to a reduction in the neutron-proton ratio.During a beta emission, the mass number of the parent and daughter nuclei remain the same.The atomic number of the daughter nucleus increases by one unit above that of the parent nucleus as we can see from the equation.
[tex]^{212}Tl_{81}---->\beta + ^{212}Pb_{82}[/tex]
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Given the following unbalanced equation:
_____ CoCl2 + _____ F2 à _____ CoF2 + _____ Cl2
If you are given 11.84 mole of CoCl2, how many moles of CoF2 will be produced?
Answer:
11.84 moles
Explanation:
We first balance the chemical equation
[tex]CoCl_{2} + F_{2} ------> CoF_{2} + Cl_{2}[/tex]
Both number of elements in the reactant side is equal to elements on the product side thus this equation is already balanced
Using mole ratio to find moles of [tex]COF_{2}[/tex]
1 mole of CoCl2 reacts with 1 mole of F2 to produce 1 mole of CoF2 and ! mole of Cl2
Mole CoCl2 = Mole CoF2 = 11.84 moles
A solution is made using 148.5 g of dimethyl ether (MM = 46.07 g/mol) and 90.0 g of methanol (MM = 32.04 g/mol). What is the mole fraction of the dimethyl ether in the solution?
Answer:
0.534
Explanation:
Mole fraction can be calculated using the formula:
Mole fraction = number of moles of solute ÷ number of moles of solvent and solute (solution).
In this question, solute is dimethyl ether while the solvent is methanol.
Mole (n) = mass (M) ÷ molar mass (MM)
Mole of solute (dimethyl ether) = 148.5 ÷ 46.07
= 3.22moles.
Mole of solvent (methanol) = 90 ÷ 32.04
= 2.81moles.
Total moles of solute and solvent = 3.22 + 2.81 = 6.03moles.
Mole fraction of dimethyl ether = number of moles of dimethyl ether ÷ number of moles of solution (dimethyl ether + methanol)
Mole fraction = 3.22/6.03
= 0.534
and the measured absorbance of a sample solution is 0.367, what is the ferroin concentration in the measured solution
This question is incomplete, the complete question is;
If the detailed experimentally determined calibration curve is;
Absorbance = 12,100 M⁻¹ × [ferroin (M)] + 0.00230
and the measured absorbance of a sample solution is 0.367, what is the ferroin concentration in the measured solution?
Choice of Answer
A) 2.76 x 10⁻⁵ M
B) 3.01 x 10⁻⁵ M
C) 3.45 x 10⁻⁵ M
D) none of the above
Answer:
the ferroin concentration in the measured solution is 3.01 × 10⁻⁵M
Option B) 3.01 x 10⁻⁵ M is the correct Answer
Explanation:
Given the data in the question;
Absorbance = 12,100 M⁻¹ × [ferroin (M)] + 0.00230 ------- let this be equation 1
Measured Absorbance = 0.367
so, we simply substitute value of measured absorbance into equation 1
0.367 = 12,100 × [ferroin] + 0.00230
solve for [ferroin ]
0.367 = 12,100 × [ferroin] + 0.00230
12,100 × [ferroin] = 0.367 - 0.00230
12,100 × [ferroin ] = 0.3647
[ferroin ] = 0.3647 / 12,100
[ferroin ] = 3.014 × 10⁻⁵ ≈ 3.01 × 10⁻⁵M
Therefore, the ferroin concentration in the measured solution is 3.01 × 10⁻⁵M
Option B) 3.01 x 10⁻⁵ M is the correct Answer
why hydrated CuSO4 is blue while anhydrous CuSO4 is white??
Answer:
The correct answer is - water acts as a ligand that splits d orbitals.
Explanation:
Hydrated CuSO4 has a central metal (Cu) surrounded by the water molecules, here water molecules play a role of the ligands that causes the splitting of d-orbitals. This splitting brings d-d transition and emits the blue color of Cu in the visible light.
Anhydrous CuSO4 on other hand is colorless due to the lack of molecules of ligand that makes splitting of d orbitals impossible so no transition of d-d orbitals takes place and no emission of color.
Identify which trends in the diagrams below describe
atomic radius, ionization energy, electron affinity,
and electronegativity
Explanation:
the atmoc radius across the period
Atom radius as you move form left to right the atomic in the period table atomic radius decrease do to decrease the number of shell and it causes the Electron closed to nucleus. and also cause to decrease the inozation engey, electronegative andelectro affinity....... in the group the atomic radius increase as you move down the group do to increase number of shell because the Electron are far-away to the nuclear and it causes the small amount of energy to ionization so that the ionization engey , electronaffity and electronegative are increasehow do I solve this?
Answer:
Explanation:
When you divide exponentials, you subtract the powers. For the numbers infront, just use a basic calculator for.
7.95/6.02 = 1.32
10^22/10^23 = 10^-1
1.32 x 10^-1 is your answer
1. During primary ecological succession, the initial formation of soil helps establish —
C. shrubs
D. trees
A. grasses
B.mushrooms
During primary ecological succession, the initial formation of soil helps establish grasses. Option D is correct. This is further explained below.
What are grasses?Generally, a Grass is simply a plant with slender leaves that emerge from the ground. In a lawn and other areas, a typical type of grass is utilized to cover the ground.
In conclusion, Grasses are very populus.
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Why is an electron ejected when green light hits the metal?
Explanation:
If a large photon strikes the surface, that has enough strength to take out an electrode, which will then travel to the positive side since it is negative. Current is flowing at this stage. Since the reduced photons will be unable to distinguish between atoms, no power can pass.
Draw the simplified curved arrow mechanism for the reaction of butan-2-one and CH3Li to give the major product.
Answer:
Follows are the solution to this question:
Explanation:
Please find the image file of the chemical reaction in the attachment:
In a water medium, the CH3- type CH 3Li is a heavy nucleophile that attacks the carbonyl carbon atom to form the alkoxide ion, which will then be protonated to form alcohol.
Which statements accurately describe the roles of water on Earth? Check all that apply.
It transports nutrients and waste in the body.
It regulates body temperature.
It carries cold water from the equator to the poles.
It wears away rock and soil.
It reflects sunlight that hits the oceans.
Answer:
It transports nutrients and waste in the body
It regulates body temperature
Explanation:
Water can be regarded as one of the basic substance needed by biological organism to survive, and for growth of vegetation. Biological process such as regulation of body temperature and transportation of nutrients into the body's blood for growth of different organisms is been aided by water.
Answer:
A, B, and D
Explanation:
19E molar/molal Test
The total number of protons and neutrons in the nucleus of an atom is called the___________
What type of mutation occurred?
Original: ATT CAC
Mutated: ATT TCA C
substitution (point)
insertion (addition)
deletion
Answer:
insertion (addition)
Explanation:
A T was added, making the sequence shift.
What is the subscript of Carbon in Isovaleric acid C5H10O2
Do you think the ingredients changing into a cake
in the oven are a chemical reaction? Explain why you
think baking a cake is or is not a chemical reaction.
A 1.00 liter solution contains 0.31 M hydrocyanic acid and 0.40 M sodium cyanide. If 0.100 moles of barium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of barium hydroxide.)
a. The number of moles of HCN will remain the same.
b. The number of moles of CN will decrease.
c. The equilibrium concentration Of H3O+ will increase.
d. The pH will increase.
e. The ratio of [HCN]/ [CN-] will remain the same.
Explanation:
acid --> HCN
base --> KCN
now
another base NaOH is added
we know that
base will react with an acid
so
OH- + HCN ---> CN- + H20
we can see that
HCN is used up , so number of moles of HCN will decrease
CN- is being formed , so number of moles of CN- will increase.
A false
B false
C false
D true
E false
Which change will cause more CO2 to form in a closed container?
Answer:
it would be E. because it would create steam from the h2o
The half-life of the radioactive isotope polonium-218 is 3.05 minutes.
How long will it take for the activity of a sample of polonium-218 to decrease from 2.81E4 Ci to 3.52E3 Ci?
Answer: It will take 9.13 minutes for the sample.
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = initial amount of the reactant = [tex]2.81\times 10^4[/tex]
a - x = amount left after decay process = [tex]3.52\times 10^3[/tex]
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{3.05min}=0.227min^{-1}[/tex]
b) for activity to decrease from 2.81E4 Ci to 3.52E3 Ci:
[tex]t=\frac{2.303}{0.227}\log\frac{2.81\times 10^4}{3.52\times 10^3}[/tex]
[tex]t=9.13min[/tex]
Thus it will take 9.13 minutes for the sample.
[tex]t_{99.9}=40min[/tex]
The time after which 99.9% reactions gets completed is 40 minutes
Single, double, or triple covalent bonds in a carbon atom are formed from A) inner shell electrons B) valence electrons. C) both inner shell and valence electrons.
Answer:
B) valence electrons.
Explanation:
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
For example, oxygen has a total number of eight (8) electrons while neon has total number of ten (10) electrons. Therefore, an atom of oxygen is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon with an atomic number of 10.
Basically, each free electrons (valence electrons) produces a covalent bond.
Hence, single, double, or triple covalent bonds in a carbon atom are formed from valence electrons.
Single, double, or triple covalent bonds in a carbon atom are formed from Valency electrons.
The valency electron are the electrons found in the outermost shell of an
atom.
The valency electron of an atom determines the kind of bonding that exist in
an element .
Neutral Carbon atoms has 6 electrons . The number of valency electrons
(electrons in the outermost shell) in Carbon is 4 valency electrons.
So, carbon can form covalent bond by sharing electrons with other atom of
an element. The bonding maybe single, double or triple bonds .
This bonding are formed by the electrons in the outermost shell(valency electrons)
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how Is disaccharide is hydrolyzed into monosaccharides
Differences in air temperature and pressure cause movements of air also known as ?
Grant found the mass of an empty crucible and lid to be 62.549 g. After he
added an unknown, the mass was 63.089 g. The crucible and lid and unknown were
heated strongly for 10 minutes. After cooling, the mass of the crucible and lid and sample
were found to be 62.928 g. Grant also performed a flame test on a sample of his unknown,
and found it produced a violet flame. Is the unknown NaHCO3, Na2CO3, KHCO3, or K2CO3?
Explain the reasoning used to arrive at your answer.
Answer:
See explanation
Explanation:
First of all, we have been told that Grant performed a flame test on the unknown sample and the flame colour was found to be violet. Violet flame implies that the compound is a compound of potassium metal since potassium metal produces a violet flame.
We can see that the mass of crucible + sample decreased from 63.089 g to 62.928 g implying that the unknown sample was decomposed and some part of it may have been lost as gases.
Having this in mind, we already know that KHCO3 decomposes according to the reaction; 2 KHCO3(s) → K2CO3(s) + CO2(g) + H2O(g)
So, the unknown compound must be KHCO3. Decomposition of the compound involves the loss of H2O and CO2 as gases which accounts for the decrease in mass of crucible + unknown sample after heating.