Answer and Explanation:
Dado que la capa de ozono protege la vida en la Tierra actuando como filtro de radiaciones nocivas del Sol, su destrucción trae como consecuencia un aumento de la radiacion UV que puede provocar:
- daños en animales y en el hombre: aumento de casos de cáncer de piel, cataratas en ojos, debilitamiento del sistema inmune.
- alteración en el desarrollo de especies vegetales .
- contribución al efecto invernadero y al calentamiento global.
Para revertir el deterioro de la capa de ozono, podemos tomar algunas medidas:
- no utilizar productos que contengan clorofluorocarbonos (CFC), como por ejemplo algunos aerosoles.
- evitar el uso de productos que contengan halones
- evitar el uso de hidrofluorcarbonos (HFCF)
Estos compuestos químicos reaccionan y destruyen el ozono, por lo que si evitamos utilizarlos, con el tiempo la capa de ozono se recuperará.
What Effect on the temperature of a boiling liquid and on it's distillation temperature is produced by a soluble nonvolatible impurity
Answer:
What effect on the temperature of a boiling liquid and on its distillation temperature is produced by each of the following?(a)A soluble, nonvolatile impurity? It would cause the mixture to boil at higher temperature and increase the distillation temperature.
It would cause the mixture to boil at a higher temperature and increase the distillation temperature.
What is distillation?Distillation is a process involving the conversion of a liquid into a vapour that is subsequently condensed back to liquid form.
During distillation, substances separate based on their boiling points. The boiling point of the mixture varies as vapour rises in a distillation column, due to changes in temperature and pressure. This process divides distillation into stages.
Hence, It would cause the mixture to boil at a higher temperature and increase the distillation temperature.
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2.)Which action forms a different chemical substance?
A. crushing a rock
B. burning a piece of wood
C.mixing salt and pepper
D.melting an ice cube
Answer:
B. burning a piece of wood
Explanation:
The Chemical Would Be The Air Coming From The Wood While Burning It
Tell Me If Im Correct
Using the chemical formulae alone, how can you differentiate between Type I Ionic, Type II Ionic, Type III Ionic, and Covalent compounds?
Explanation:
Type I
These are compounds in which the cation (metal ion) has a fixed charge.
Examples are;
MgO. NaCl
Type II
These are ionic compounds in which the cation (metal ion) has a variable charge.
Examples are;
FeCl3, PbS2
Type III
These are covalent molecules with no cation.
Examples are;
SO3, N2O5
Please help me with this
What is the Hsol for KF →K+ + F-? The lattice energy is –784 kJ/mol, the enthalpy of hydration for Ki is –336
kJ/mol, and the enthalpy of hydration for F-is-431 kJ/mol. Use AHsol= - Hiat + Hydr
0-879 kJ/mol
0 -17 kJ/mol
O 17 kJ/mol
O 1,551 kJ/mol
Answer:
17 kJ/mol
Explanation:
got it on edge
Pl help it’s for a grade and I can’t find it
Answer:
personally I think it's a but it could also be D.
But yeah personally I would say A
what is wind in more than 15 words?
Answer:
Wind is Air in a natural motion, as that moving horizontally at any velocity along the earth's surface.
which of the following is not found in cytoplasm
A.water
B.carbohydrates
C.salt
D.vitamins
Answer:
B is the right answer
carbohydrates are not found inside the cytoplasm so therefore it is B
Answer:
D
Explanation:
The cytoplasm is composed of water, salt and some organic molecules. (e.g. carbohydrates)
I need help :/
:) :) :)
Answer: I want to say 1
Explanation:
I think
Calculate the number of atoms
in 10.0g of He.
A. 3.83 x 1023
B. 2.41 X 1024
C. 1.51 X 1024
D. 6.02 x 1023
What is the charge of an atom containing 9 protons, 11 neutrons, and 12 electrons?
Answer:
Explanation: atom is changed to ion. There are 3 more electrons than
Protons, so charge is -3. Actually, F atom can gain only one electron.
Then it will have an octet (8 electrons)
Which of these boxes will not accelerate?
Answer:
B as all the forces cancel out
Explanation:
20-20=0
25-25=0
Give one example of
a) Homogeneous mixture of two elements
Answer:
honey
Coffee
blood
Explanation:
These components are uniformly distrubuted and these cannot be seperated unlike heterogeneous
What type of reaction does this investigation demonstrate, and as time progresses what will happen to the mass reading on
the scale?
O A. This is a synthesis reaction and the mass reading will decrease as time progresses.
OB. This is a decomposition reaction and the mass reading will stay the same as time progresses,
C. This is a synthesis reaction and the mass reading will stay the same as time progresses,
D. This is a decomposition reaction and the mass reading will decrease as time progresses,
Answer:
B. This is a decomposition reaction and the mass reading will stay the same as time progresses,
Explanation:
Decomposition reactions are when one reactant decomposes (breaks down) into two or more products. They follow the general form of:
AB --> A + B
The law of conservation of mass tells us that when a chemical reaction takes place, no mass is created or destroyed but transforms from one form to another. You can see from the diagram that you have the same number and type of atoms on each side of the reaction.
Answer:
B
Explanation:
Plz answer question! Due Today!!! Question is in picture! Will make BRAINLIEST for first correct answer!!! No links plz!
Answer:
I'd Go. B. weigh everything, let the reaction happen, then weigh everything again.
help, please. balance these equations by writing the proper coefficients in the blanks provided.
1. _____Mg + _____O2 --> _____ MgO
2. _____P + _____O2 --> _____ P2O5
3. _____S + _____O2 ---> _____SO2
4. _____Na + _____Cl --> _____NaCl
5. _____CaCO3 --> _____CaO + _____CO2
thank you :)
Answer:
1. 2,1,2
2. 4, 5, 2
3. 1,1,1
4. 1, 1, 1
5. 1, 1, 1
Hope this helps!
4.How element gold is different from oxygen?
Answer:
Gold is a metal, more specifically a transition metal, whereas Oxygen is a nonmetal, more specifically a reactive nonmetal. Using this information, you can compare and contrast metals, nonmetals, and metalloids.
Metals are:
Shiny
High melting point
Mostly silver or gray in color
Mostly solids at room temperature – Mercury (Hg) is a liquid at room temperature
Malleable – able to be hammered into a thin sheet
Ductile – able to be drawn/pulled into a wire
Good conductors of heat and electricity
Nonmetals are:
Dull
Low melting point
Brittle – break easily
Not malleable
Not ductile
Poor conductors of heat and electricity
Metalloids are:
Found on the “zig-zag” line on the Periodic Table of Elements
Have properties of both metals and nonmetals
Can be shiny or dull
Semiconductors – able to conduct electricity under certain conditions
Explanation:
Reccomend this site for questions llike these: https://ptable.com/#Properties
1. Mercury is most often obtained by roasting cinnabar (HgS). How many grams of cinnabar
are required to obtain 165 grams of mercury?
HgS + 02—-Hg + SO2
Answer:
191.4 grams of cinnabar are required to obtain 165 grams of mercury.
Explanation:
The balanced reaction is:
HgS + O₂ ⇒ Hg + SO₂
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
HgS: 1 mole O₂: 1 mole Hg: 1 mole SO₂: 1 moleBeing the molar mass of each compound:
HgS: 232g/moleO₂: 32 g/moleHg: 200 g/moleSO₂: 64 g/molethe following mass amounts of each compound participate in the reaction:
HgS: 1 mole* 232 g/mole= 232 gO₂: 1 mole* 32 g/mole= 32 gHg: 1 mole* 200 g/mole= 200 gSO₂: 1 mole* 64 g/mole= 64 gThen you can apply the following rule of three: if by stoichiometry 200 grams of Hg are formed from 232 grams of HgS , 165 grams of Hg are formed from how many grams of HgS?
[tex]mass of HgS=\frac{165 grams of Hg*232 grams of HgS}{200 grams of Hg }[/tex]
mass of HgS= 191.4 grams
191.4 grams of cinnabar are required to obtain 165 grams of mercury.
What does it mean to be limiting or excess? (Limiting Reactant)
Answer:
Find the limiting reagent by calculating and comparing the amount of product each reactant will produce. Balance the chemical equation for the chemical reaction. The reactant that produces a lesser amount of product is the limiting reagent. The reactant that produces a larger amount of product is the excess reagent.
Explanation:
Can someone plz help me with this one problem plzzzzz I’m being timed!!!
Answer:
answer : the penguins do
CaC2 + 2H2O ⟶ C2H2 + Ca(OH)2
How many moles of water are needed to produce 56.8g C2H2?
Amount of moles of water is 4.36 mol
Explanation: M(C2H2) = 2·12.01 + 2·1.008 = 26.036 g/mol
Amount of substance is n= m/M= 56.8 g / 26.036 g/mol= 2.18159 mol
Water is needed 2·2.18 mol = 4.36 mol
The number of protons is equal to
a the number of neutrons.
b the atomic mass.
c the number of electrons.
d the atomic number.
Answer:
c the number of electrons
Write the name of flame used In charcoal cavity test.why?
Answer:
the reducing flame also called the carburizing flame.
Explanation:
because it gets the oxides of the unknown salts
pls i have a chemistry test answers asap :'(
Answer:
Zinc is more active than copper.
Explanation:
Now, the reason is that Zinc loses its valence electrons more easily than copper to take part in a reaction.
Which is the molar mass of BF3?
10.81 g/mol
29.81 g/mol
48.81 g/mol
67.81 g/mol
Answer: The molar mass of [tex]BF_3[/tex] is 67.81 g/mol
Explanation:
Molar mass is defined as the mass in grams of 1 mole of a substance.
S.I Unit of Molar mass is gram per mole and it is represented as g/mol.
Atomic Mass of Boron (B) = 10.81 g
Atomic Mass of Flourine (F) = 18.99 g
Molecular mass of [tex]BF_3[/tex] = 1 (10.81)+3(18.99) g = 67.81 g
Thus molar mass of [tex]BF_3[/tex] is 67.81 g/mol
What are some of the ethical issues of editing human DNA? Cite examples from the text to defend your answer.
Answer:
one would be if the human had no say in it
The most controversial ethical issue surrounding modifying human DNA is, according to the text, is that it will lead to the creation of designer children with improvements in intelligence or physical performance.
What is DNA?Humans and nearly all other species carry their genetic information in DNA, also known as deoxyribonucleic acid.
The DNA of an individual can be found in almost all of their cells.
The majority of DNA is found in the cell nucleus (where it is known as nuclear DNA), but there is also a small quantity of DNA in the mitochondria (where it is called mitochondrial DNA or mtDNA).
Other ethical issues include the possibility of an identity crisis for a person born with genes from three different people as well as the danger of making mistakes in the human genome that could lead to the spread of genetic illnesses in the population.
Thus, it can be concluded that there are various ethical issues of editing human DNA.
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Your question is incomplete, but most probably the complete question was,
Read Proposed Treatment to Fix Genetic Diseases Raises Ethical Issues, By Rob Stein, NPR's Morning Edition, 2013
What are some of the ethical issues of editing human DNA? Cite examples from the text to defend your answer.
Kidneys remove what kind of waste from the body? A. Undigested food B. Carbon dioxide C. Oxygen D. Nitrogen waste
Answer:
Option D: nitrogen waste
Explanation:
Excretion.
This is removal from of waste products of chemical reactions. It involves the eliminating excess water and salts taken in with our human diet and also spent hormones
Nitrogenous waste products are the human waste products which contain nitrogen and are poisonous to the body.
The kidneys is responsible for the remove of Nitrogenous waste, water, salts, toxins, hormones e. t. c. It is the are the main principle excretory organs. They maintain the constant concentration of materials in the body.
Can someone help, please...?
I really can't understand this...
if common names does not exist how would be the world of organic compounds
Explanation:
I think the question is not complete
When cobalt(II) chloride is allowed to react with sodium hydroxide, the resulting
products are cobalt(II) hydroxide and sodium chloride. Determine the mass of
cobalt(II) chloride required to completely react with 114g of sodium hydroxide.
Answer:
Reaction CoCl2 + 2 NaOH -> Co(OH)2 + 2 NaOH
You need to count number of moles of NaOH
Amount of mole is n = m/M = 114 g / 39.998 g/mol = 28,5 mol (about)
Amount of CoCl2 is half from that
Calculate molar mass of CoCl2 and multiply it by 28,5 mol
Explanation: