table below shows the electronegativities of four elements. Which of the following bonds is the most polar?
carbon - hydrogen
carbon - fluorine
fluorine - fluorine
hydrogen - oxygen
Answers
Lets find the electronegativity difference between the bonded atoms;
C-H = 2.6-2.2 = 0.4
C-F = 4.0-2.6 = 1.4
F-F = 4.0-4.0 = 0
H-O = 3.4-2.2 = 1.2
Here the electronegativity difference is highest for C-F bond hence C-F bond is most polar.
Related Questions
Hydrogen gas can be made by reacting methane (CH4) with high temperature steam: CH4(g) + H2O(g) ---> CO(g) + 3H2(g)
How many hydrogen molecules are produced when 256 grams of methane reacts with steam? Please SHOW WORK so I can understand the concept
Answers
CH4(g) + H2O(g) ---> CO(g) + 3H2(g)
mass of methane CH4 = 256g
molar mass of methane,CH4 = C + 4 H = 16.04g/mol
moles of CH4
= mass/Molar mass
= 256/16.04
= 15.96 moles CH4
moles of H2 produced
= 15.96 moles CH4 x 3 moles H2
1 mol CH4
= 47.88 moles H2
number of H2 molecules produced here
= 47.88 moles H2 x 6.022 x 10²³ molecules
1 mole
= 288.335 x 10²³ H2 molecules
= 2.88 x 10²⁵ H2 molecules
2.88 x 10²⁵ H2 molecules are produced when 256g of methane reacts with steam.
In an experiment, 0.6mol of chlorine gas, Cl2, is reacted with an excess of hot aqueous sodium hydroxide. One of the products is a compound of sodium, oxygen and chlorine. Which mass of this product is formed?
A 21.3 B 44.7 C 63.9 D 128
Answers
Answer: B) 44.7 g
Explanation:
The equation represent the reaction is
Cl2 + 2NaOH → NaCl + NaClO + H2O
The balanced equation shows that every mole of Cl2 reacts to produce mole of NaClO
0.6 mole of Cl2 will produce 0.6 mole of NaClO
n = mass/molar mass
molar mass of NaClO = 74.5 g/mol
the mass of NaClO = n x molar mass = (0.6 mole) (74.5 g/mol) = 44.7 g
( 20 points ) Jerri is planning to rebuild the engine of an antique car. She has chosen all the materials she needs including a high quality synthetic oil to reduce friction in the engine. What effect will reducing friction have on the engines performance?
A Reduces friction means reduced efficiency
B Reduces friction means reduced heat transfer
C Reduces friction means increased efficiency
D Reduces friction means increased heat transfer
Answers
The option, B. Reduced friction means reduced heat transfer " is correct.
Answer:
Reduces friction means increased efficiency
Explanation:
Friction is known to decrease efficiency in machines. In redesigning the engine if the antique car, and the inclusion of oil to reduce friction in the engine, she aims to improve the efficiency of the engine.
Friction leads to lost work in mechanical systems. Friction accounts for the fact that the efficiency of an engine is never 100% since some of the input work is lost as friction.
Hence decreasing the friction improves the efficiency of the machine.
The elements X and Y combine in different ratios to form four different types of compounds: XY, XY₂, XY₃, and XY₄. Consider that there is enough of each sample to contain 2 g of X, and the mass of X is estimated to be 2 g and the mass of Y is estimated to be 4 g.
Arrange the following ratios in order of their increasing value. (The exercise gives me three tabs to put in order from highest to least. These are in the pic)
Rank from highest to lowest ratio. To rank items as equivalent, overlap them.
I put XY₄ as highest, then XY₃ in the middle, and XY₂ as lowest. Is this order correct? I'm not quite understanding this lesson :// so if i could also get some sort of an explanation, that'd be great!!
Answers
Yeah, it would be that order since if XY was a number, you would multiply it by that number 4 total times. So it would be a large number. And then it gets smaller and smaller when it gets to XY2. So yeah you got the order correct.
Elements are species of atoms that are defined and characterized by the number of protons. The multiple proportions of the element from higher to lowest are XY₄, XY₃, and XY₂.
What are elements?Elements have been defined as the atomic species that make the molecule and the compounds by combining chemically through bond formation. They are indivisible particles that cannot be broken further.
When two or more elements chemically links then a compound or molecule is formed like element X and Y combined in various ratios and proportions to form XY, XY₂, XY₃, and XY₄.
The highest ratio of the proportions will be XY₄ as it has one X and four Y elements, followed by XY₃ with one X and three Y. Lastly XY₂ will be the lowest ratio as it has one X and two Y elements.
Therefore, the order is XY₄> XY₃ > XY₂.
Learn more about elements, here:
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