The impact of a higher atmospheric carbon dioxide concentration on Earth's surface temperature has been the subject of numerous theoretical calculations1,2.
Estimates of the rise in Earth's surface temperature brought on by doubling the amount of carbon dioxide in the atmosphere typically fall between 0.7 and 2.9 °C. The temperature rises range from 0.096 to 0.40 °C for a 10% increase in carbon dioxide.All of these conclusions were reached through the use of theoretical models, ranging in complexity from one-dimensional investigations of the planetary radiation budget to three-dimensional general circulation models. Here, a novel solution to this issue is discussed, enabling the calculation of an empirical estimate of the heating of the Earth's surface caused by the greenhouse effect of carbon dioxide.This method suggests that the Earth only warmed by 0.40 °C or less between 1880 and 1970.
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Which of the statements are true ONLY for lonic compounds? (select all that apply)
Smallest unit is called a formula unit
Bonding determined by valence electrons and the octet rule
Compounds are electrically neutral (no charge) overall
Forms between a metal and a nonmetal
Compounds have relatively weak bonds
Creates geometrical shapes that minimize electron pair repulsion (VSPER model)
Forms between two non-metals
Formed by the transfer of electrons
Good conductor when dissolved in water
Formed when atoms share valence electrons
Smallest unit is a molecule
Forms repeating patterns in a crystal lattice structure
Have high melting and boiling points
Answer:
Smallest unit is called a formula unit
Forms between a metal and a nonmetal
Formed by the transfer of electrons
Good conductor when dissolved in water
Forms repeating patterns in a crystal lattice structure
Have high melting and boiling points
Explanation:
I have 1.8066 x 1024 atoms of Calcium, how many grams of calcium do I have?
Answer: 1849.9584
Explanation:
In a chemical reaction, how do the reactants compare to the products?
Question 3 options:
A) They are different substances with different properties
B) They are the same
Answer:
A) They are different substances with different properties.
Explanation:
A chemical equation describes a chemical reaction. Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation.
So, A is correct.
(Also it said there were 3 options but only showed 2)
Please click thanks!:)
what is a covalent bond?
Answer:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
hope it helps, please mark as brainliest
What substance, if added to the mixture of salt and sand, could be separated from the mixture using a sieve
O sugar
O iron filings
O flour
O plastic beads
What is the mass, in grams, of 122 atoms of aluminum? Round your answer to proper significant figures.
Answer:
Mass = 547.02 × 10⁻²³g
Explanation:
Given data:
Number of atoms of Al = 122 atom
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
122 atom/6.022 × 10²³ atoms × 1 mol
20.26× 10⁻²³ mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 20.26× 10⁻²³ mol × 27 g/mol
Mass = 547.02 × 10⁻²³g
How many moles are required to react with 4.5 moles of H2?
N2 + 3 H2 ------> 2 NH3
Answer:
1.5 mol
Explanation:
Given data:
Number of moles of H₂ = 4.5 mol
Number of moles of N₂ = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of hydrogen and nitrogen.
H₂ : N₂
3 : 1
4.5 : 1/3×4.5 = 1.5 mol
Thus, 1.5 moles of nitrogen are required to react with hydrogen.
What measurements have the same number of significant figures as the measured number
0.1060?
Answer: 0.3224, 7342, 54.32
Explanation:
0.1060 has 4 sig figs (1060 is 4 digits after the decimal point)
answers please!!!!!!
(a) HCL(aq) + NaOH(aq) ---------------> ___ + ____
The answer will be NaCl and H2O
(b) An equation to show the reaction between hydrogen ions and hydrogen ions and hydroxide ions is given below :
H+ + OH− ⇄ H2O
This reaction is known as neutralization reaction.
(c) Joey could tell us the reaction is over only when we obtained salt and water from the given chemical reaction (NaOH + HCl). This a basically a neutralization reaction ( the reaction generally finished at equilibrium)
(d) pH is 7.
This is because at the ending point the moles of HCl = the moles of NaOH so all that is present is H2O, Cl–, and Na+. So, the pH is 7.
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Balance all the equations
1)Ferric chloride + Ammonium hydroxide Ferric hydroxide + Ammonium chloride
2) Aluminum + Hydrochloric acid Aluminium chloride + Hydrogen gas
Answer:
Balancing Chemical Equations
Balance the equations below:
1) __1__ N2 + __3__ H2 > _2__ NH3
2) __2__ KClO3 >⮴ __2__ KCl + __3__ O2
3) __2__ NaCl + __1__ F2 ⮴ __2__ NaF + __1__ Cl2
4) __2__ H2 + __1__ O2 ⮴ __2__ H2O
5) __1__ Pb(OH)2 + __2__ HCl ⮴ __2__ H2O + __1__ PbCl2
6)__2__ AlBr3 + __3__ K2SO4 ⮴ __6__ KBr + __1__ Al2(SO4)3
7) __1__ CH4 + __2__ O2 ⮴ __1__ CO2 + __2__ H2O
8) _1___ C3H8 + _5___ O2 ⮴ __3__ CO2 + __4__ H2O
9) __2__ C8H18 + __25__ O2 ⮴ __16__ CO2 + __18__ H2O
10) __1__ FeCl3 + __3__ NaOH ⮴ __1__ Fe(OH)3 + __3__NaCl
11) __4__ P + __5__O2 ⮴ __2__P2O5
12) __2__ Na + __2__ H2O ⮴ __2__ NaOH + __1__H2
13) __2__ Ag2O ⮴ __4__ Ag + __1__O2
14) __1__ S8 + __12__O2 ⮴ __8__ SO3
15) _6___ CO2 + _6___ H2O ⮴ __1__ C6H12O6 + __6__O2
16) ___1_ K + __1__ MgBr ⮴ __1__ KBr + __1__ Mg
17) __2__ HCl + __1__ CaCO3 ⮴ __1__ CaCl2 + __1__H2O + __1__ CO2
18) __1__ HNO3 + __1__ NaHCO3 ⮴ __1__ NaNO3 + __1__ H2O + _1___ CO2
19) _2___ H2O + __1__ O2 ⮴ __2__ H2O2
20) __2__ NaBr + __1__ CaF2 ⮴ __2__ NaF + __1__ CaBr2
Explanation:
1-calculate the mass of 4 moles of Na
2-what is the mass of 0.3 moles of water H2o H:1 O:16
3-compute the number of moles found in 10g of ethanol C2H5OH C:12 O:16
please help me as fast you can
1. 92 g
2. 5.4 g
3. 0.217 moles
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt n=\dfrac{m}{MW}[/tex]
1. the mass of 4 moles of Na(MW= 23 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=4\times 23\\\\mass=92~g[/tex]
2. the mass of 0.3 moles of water(MW=18 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=0.3\times 18\\\\mass=5.4~g[/tex]
3. the number of moles found in 10g of ethanol C2H5OH(MW=46 g/mol) :
[tex]\tt mol=\dfrac{10}{46}\\\\mol=0.217[/tex]
Why when we chew a minty pice of gum your mouth and tounge is cold when you suck in air and when you drink moderaters help!!!!!!!!!!!! ASAP!!!!!!!!!!!!!!!!!!!
What is the pressure of 1.50 moles of a gas in a 30.0L tank at a temperature of
285K?
The pressure of the gas : 1.1685 atm
Further explanationIn general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
n=moles=1.5
V=volumes = 30 L
T=temperature=285 K
The pressure :
[tex]\tt P=\dfrac{nRT}{V}\\\\n=\dfrac{1.5\times 0.082\times 285}{30}\\\\P=1.1685~atm[/tex]
What letters in the middle of an element card represent?
How can you predict which element an atom is based on one of the two subatomic particles in the nucleus?
Which two of the three subatomic particles have an effect on the mass of an atom?
Answer:
I think it's the second answer
the atomic masses of 63 cu (69.17 percent) and 65 cu (30.83 percent) are 62.94 and 64.93 amu, respectively. calculate the average atomic mass of copper. the percentages denote the relative abundances
Answer:
The average atomic mass of copper is 63.55 amu.
Explanation:
hope this help
what is a polar zone
Answer:
polar zone - the part of the Earth's surface forming a cap over a pole; characterized by frigid climate. Frigid Zone, polar region. climatic zone - any of the geographical zones loosely divided according to prevailing climate and latitude.
Explanation:
The polar regions, also called the frigid zones, of Earth are the regions of the planet that surround its geographical poles, lying within the polar circles.
Please help!!! I don’t know
Answer:
4.06×10^23
Explanation:
1 mole has 6.023×10^23 molecules
0.675 moles have (6.023×10^23×0.675) molecules
A 5 kilogram ball and a 10 kilogram ball are sitting on the edge of a wall. Which has more potential energy?
The 10 kilogram ball.
The 5 kilogram ball.
The have the same energy.
Answer:
The 10 kilogram ball
Explanation:
2. A gas that has a volume of 28 liters, a ternperature of 45 °C, and an unknown
pressure has its volume increased to 34 iters and its temperature decreased to
35 °C. If I measure the pressure after the change to be 2.0 atm, what was the
original pressure of the gas?
The original pressure of the gas : 2.507 atm
Further explanationBoyle's law and Gay Lussac's law
[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]
P1 = initial gas pressure (N/m² or Pa)
V1 = initial gas volume (m³)
P2 = final gas pressure
V2 = final gas volume
T1 = initial gas temperature (K)
T2 = final gas temperature
V₁=28 L
T₁=45+273=318 K
P₂=2 atm
V₂=34 L
T₂=35+273=308 K
then initial pressure :
[tex]\tt P_1=\dfrac{P_2.V_2.T_1}{V_1.T_2}\\\\P_1=\dfrac{2\times 34\times 318}{28\times 308}\\\\P_1=2.507~atm[/tex]
Which of the following is a reactant?
Answer:
CH4 is a reactant
Explanation:
however 2o2 is also reactant but coefficient
in a particular gravimetric analysis, the precipitate of barium sulfate was weighed before it was completely dried. the likely impact of this error on the calculated result is...
The result is a higher result than the correct value.
Gravimetric analysis describes a set of methods used in analytical chemistry for the quantitative determination of an analyte based on its mass. The principle of this type of analysis is that once an ion's mass has been determined as a unique compound, that known measurement can then be used to determine the same analyte's mass in a mixture, as long as the relative quantities of the other constituents are known.
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Why was there no reaction in some of the wells?
Convert 34.5 oC into K. K = oC + 273.15 K
A 34.5 K
B 238.65 K
C 307.65 K
D 273.15 K
Conversion of 34.5 °C to K = C 307.65 K
Further explanationTemperature is one of the principal quantities that shows the degree of heat or cold from an object / space
Temperature is used as a guide to the level of heat energy from objects
Temperature measures thermal energy
The temperature conversion :
°F = (9/5) °C + 32
°R = (4/5) °C
°K = °C + 273 .15
34.5 °C into K
[tex]\tt 34.5+273.15=\boxed{\bold{307.65~K}}[/tex]
Answer:
Temperature is one of the principal quantities that shows the degree of heat or cold from an object / space
Temperature is used as a guide to the level of heat energy from objects
Temperature measures thermal energy
The temperature conversion :
°F = (9/5) °C + 32
°R = (4/5) °C
°K = °C + 273 .15
Explanation:
which need or want does this technology meet
Answer:
B. It allows people to rapidly heat items.
Explanation:
because it's a microwave...
Answer:
B. It allows people to rapidly heat items.
I am a bit skeptical about the radiation that allows microwaves to heat items so quickly though...
Explanation:
This is common sense, mate. Sorry to break it to you.
How many phosphorus atoms are there in 1.75 mol of calcium phosphate,
Ca3(PO4)2
Answer:
It has 2 phosphorus atoms in 1 mol
so for 1.75 mol =2×1.75
Explanation:
need thanks and make me brainiest if it helps you
There will be two atoms of phosphorus in the 1.75 mol of calcium phosphate.
What are atoms?
Atoms are the smallest unit of matter. In a chemical reaction, the number of atoms shows the quantity of an element in the compound or reaction. Phosphorus is a chemical element that is preset in the periodic table.
In calcium phosphate, Ca3(PO4)2, the number of atoms can be calculated by counting the number of moles that is given in the equation.
The number of atoms of calcium is 3, and the number of phosphorus atoms is 2.
Now given the 1.75 mol of calcium phosphate, so the number of atoms of phosphorus will be the same in any number of moles of calcium phosphate. So there will be 2 atoms of phosphorus in the given equation.
Thus, the number of atoms is two.
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As the effective
nuclear charge is increased with the same amount of electron shielding,
A The valence electrons have a more negative potential energy, decreasing the amount of energy
required to remove them
B The valence electrons have a less negative potential energy, decreasing the amount of energy
required to remove them
c The valence electrons have a more negative potential energy, increasing the amount of energy
required to remove them
D The valence electrons have a less negative potential energy, increasing the amount of energy
required to remove them
Please solve for Cu,N,and O an dif you can show how cause ik confused
Cu⇒ 1 atom
N⇒2 atoms
O⇒6 atoms
Total 9 atoms
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
Chemical formula : Cu(NO₃)₂
Number of Cu : 1
Number of N : 2
Number of O = 2 x 3 = 6
Total atoms in Cu(NO₃)₂ : 1 + 2 + 6 = 9
Is H2O+CO2 = H2CO3 a redox reaction? How?
Answer:
It is not an oxidation-reduction reaction. The formation of carbon dioxide and water are redox reactions which involve the oxidation of carbon and hydrogen respectively with oxygen being reduced in both the case.
Explanation:
This is not a redox reaction.
A redox reaction is the one that involves reduction and oxidation simultaneously. In a redox reaction, one of the substance gets oxidised and behaves as a reducing agent and the other gets reduced that behaves as an oxidizing agent.
The oxidation or reduction of the substance is decided by the change in oxidation number of the atom which is the charge that an atom appears to have on forming ionic bonds with other heteroatoms.
In this reaction, no change in oxidation state of the atoms takes place and thus this reaction is not a redox reaction.
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Question 4 (2 points)
Photosynthesis takes place in the nucleus of cells. (2 points)
O True
O False
false
Explanation:photosynthesis takes place inside an organelle called a chloroplast. For plants, chloroplast-containing cells exist in the mesophyll.
Write correct formulas predict the products and balance the following.
Tin (IV) Sulfate + Ammonium Phosphate forms ?