The relatively high boiling point of water is due to water havingA) hydrogen bonding
B) metallic bonding
C) nonpolar covalent bonding
D) strong ionic bonding

Answers

Answer 1

Answer: The answer is A because water molecules don't have metallic bonding, and water is also polar, and it takes more time for the heat energy to break down the hydrogen bonds

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Volcanic eruptions can be very dangerous for nearby human and animal populations. One danger is that lava and ash may bury habitats. What is another danger during a volcanic eruption?A. Lava or hot debris may start fires. B. Lava flows may cause tsunamis. C. Volcanic eruptions always cause flooding. D. Volcanic eruptions always cause high winds.

BRAINLEST IF RIGHTTechnician A says that the piston's most important function is to transfer the force produced by the burning air-and-fuel mixture into usable power. Technician B says that the piston size is used to help form a seal between the piston and the cylinder walls. Who is right?

A. Neither Technician A nor B
B. Technician A only
C. Technician B only
D. Both Technicians A and B

Answers

the answer is c hope i helpd

Answer B, Pistols draw in Air-Fuel mixture then compresses it, ignites spark plug, then puts in exhaust. This making fuel.

In each reaction box, place the best reagent and conditions from the list below.

Answers

This is a two step step reaction as shown below,

Step 1:
Epoxidation of Alkene:
In first step Cyclohexene is treated with peroxybenzoic acid in the presence of Dichloromethane which results in the formation of epoxide moiety.

Step 2:
Nucleophillic Substitution Reaction:
In second step the epoxide formed is treated with Sodium Methoxide which acts as a nucleophile and attacks the less hindered carbon of epoxide resulting in the formation of final product as shown below.

Final answer:

The best reagent and condition for a chemical reaction is dictated by the reactants at hand and the substance that you're trying to produce. For instance, to convert an alkene into an alcohol, Osmium Tetroxide (OsO4) at room temperature would be an example of an ideal reagent and condition.

Explanation:

In chemistry, when you are asked to place the best reagent and conditions in a reaction box, you are trying to predict the proper chemical, heat, or pressure conditions that will foster a certain chemical reaction. This requires understanding of substances' chemical properties, behavior under different conditions, and reaction mechanisms. For instance, if we want to oxidize an alkene into an alcohol, we would choose a reagent like Osmium Tetroxide (OsO4). In this case, OsO4 would be our 'best reagent', and room temperature may serve as the ideal condition as it generally facilitates this process. Each reagent and condition depend on the reactants you start with and the product you want at the end.

Learn more about Chemical Reactions here:

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How many moles of oxygen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g/mol.4 KNO3(s) → 2 K2O(s) + 2 N2(g) + 5 O2(g)

Answers

First, convert the amount of KNO3 to moles using the molar mass:
58.6 g / 101.11 g/mol = 0.5796 mol KNO3

Next, using the given balanced reaction, use the stoichoimetric ratio to calculate the number of mole of oxygen that will be produced. From the reaction, for every 4 moles of KNO3 that decomposes, there are 5 moles of O2 formed. So,
0.5796 mol KNO3 x (5/4) = 0.7254 moles O2

Therefore, when 58.6 g of KNO3 decomposes, there are 0.7254 moles of O2 that will be formed.

The moles of oxygen formed when 58.6 g of KNO3 decomposes is $\boxed{{\text{0}}{\text{.7245moles}}}$

Further Explanation:

Stoichiometry of a reaction is used to determine the amount of species present in the reaction by the relationship between the reactants and products. It can be used to determine the moles of a chemical species when the moles of other chemical species present in the reaction is given.

Consider the general reaction,

${\text{A}}+2{\text{B}}\to3{\text{C}}$

Here,

A and B are reactants.

C is the product.

One mole of A reacts with two moles of B to produce three moles of C. The stoichiometric ratio between A and B is 1:2, the stoichiometric ratio between A and C is 1:3 and the stoichiometric ratio between B and C is 2:3.

The given reaction is,

${\text{4KN}}{{\text{O}}_3}\left(s\right)\to2{{\text{K}}_2}{\text{O}}\left(s\right)+2{{\text{N}}_2}\left(g\right)+5{{\text{O}}_2}\left(g\right)$

 On reactant side,

Number of potassium atoms is 4.

Number of nitrogen atom is 4.

Number of oxygen atoms is 12.

 On the product side,

Number of potassium atoms is 4.

Number of nitrogen atom is 4.

Number of oxygen atoms is 12.

The number of atoms of all the species in both the reactant and the product side is the same. So above reaction is balanced. The stoichiometry of the balanced reaction indicates that 4 moles of ${\text{KN}}{{\text{O}}_3}$ decompose to give 2 moles of ${{\text{K}}_2}{\text{O}}$ to form 2 moles of ${{\text{N}}_2}$ and 5 moles of ${{\text{O}}_2}$ .

The formula to calculate the number of moles of ${\mathbf{KN}}{{\mathbf{O}}_{\mathbf{3}}}$ is as follows:

${\text{Moles of KN}}{{\text{O}}_3}=\frac{{{\text{Given mass of KN}}{{\text{O}}_3}}}{{{\text{Molar mass of KN}}{{\text{O}}_3}}}$ …… (1)

The given mass of is 58.6 g.

The molar mass of is 101.11 g/mol.

Substitute these values in equation (1)

$\begin{gathered}{\text{Moles of KN}}{{\text{O}}_3}{\mathbf{=}}\left({58.6\;{\text{g}}}\right)\left({\frac{{{\text{1}}\;{\text{mol}}}}{{{\text{101}}{\text{.11}}\;{\text{g}}}}}\right)\n=0.5796\;{\text{mol}}\n\end{gathered}$

According to the stoichiometry, 4 moles of ${\text{KN}}{{\text{O}}_3}$ decompose to give 2 moles of ${{\text{K}}_2}{\text{O}}$ , 2 moles of {{\text{N}}_2} and 5 moles of ${{\text{O}}_2}$ .

So the number of moles of {{\mathbf{O}}_{\mathbf{2}}} formed by 0.5796 moles of ${\mathbf{KN}}{{\mathbf{O}}_{\mathbf{3}}}$ is calculated as follows:

$\begin{gathered}{\text{Moles of }}{{\text{O}}_2}{\mathbf{=}}\left({\frac{{5\;{\text{mol}}}}{{4\;{\text{mol}}}}}\right)*\left({0.5796\;{\text{mol}}}\right)\n=0.7245\;{\text{mol}}\n\end{gathered}$

Hence, the moles of ${{\mathbf{O}}_{\mathbf{2}}}$ produced is 0.7245 moles.

Learn more:

1. Bond energy of H-H bond in the given reaction: brainly.com/question/7213980

2. What coefficients are required to balance equation: brainly.com/question/1971314

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Mole concept

Keywords: stoichiometry, KNO3, K2O, O2, N2, moles, A, B, C, molar mass, reactants, products, 0.5796 moles, 0.7245 moles, potassium, oxygen and nitrogen.

Please Help meHello guys,i really need your help for a few questions about the greek philosopher "Democritus"
1)revisions that were made to Democritus's model once further research was done.
2)one challenge that the scientist had to overcome.

please help me

Answers

Democritus was the first to propose the idea of the atom. He said the atom was just this tiny, solid sphere. However, he used no scientific evidence to support his claim, so a guy named John Dalton did some experimenting and basically backed up Democritus' claim with evidence. Then, a guy named J.J. Thompson came along and said the atom was not solid and that is consisted of tiny negatively charged particles(electrons) and he came up with the Plum Pudding model which is just a tiny sphere with a punch of random scattered dots in it. After that, Ernest Rutherford did experiments and found that the tiny sphere is made up of mostly empty space with a tiny, dense, positively charged sphere inside of it, and the negatively charged particles just randomly float around it. Neils Bohr then said that the electrons take specific, circular, evenly spaced paths. Then, finally, we come to the Quantum Mechanical Model which is the one accepted today. This model basically vetos Bohr's idea and has a nucleus inside of an electron cloud, which is where the electrons are found.

Bacteria are smaller than viruses.

True

False

Answers

Answer:

false

Explanation:

When double-stranded DNA is heated at neutral pH, which change does not occur? A) The absorption of ultraviolet (260 nm) light increases.
B) The covalent N-glycosidic bond between the base and the pentose breaks.
C) The helical structure unwinds.
D) The hydrogen bonds between A and T break.
E) The viscosity of the solution decreases.

Answers

Answer:

B) The covalent N-glycosidic bond between the base and the pentose breaks

Explanation:

When forces that bind 2 DNA strands are broken, these strands finally split. This process is called denaturalization

The main forces that remain both DNA strands together are the hydrogen bonds (physical forces), between pair of bases (Adenine with Thymine, and Guanine with Cytosine)

Denaturalization may occur by different factor: Ph alteration, salt addition, temperature (heating), etc

When heating a DNA solution, denaturalization process may be followed using UV absorption (normally, at wavelength of 260 nm): when DNA (double strand) has its regular structure, UV light absorption is low, as the nitrogen bases are stacked like a pile of coins, for which structure absorbs less light

When DNA structure is denaturalized, these nitrogen bases are exposed, and UV absorption increases

Also, DNA denaturalization may be followed by viscosity: for a double strand DNA solution, viscosity is high due to double chain stiffness but when strands are denaturalized, simple strands solution are less viscous (so viscosity decreases over time, when heating the solution)

Lastly, when solution is heated, only physical forces are broken (hydrogen bonds) and not chemical bonds (such as covalent bonds), for which extreme conditions are needed

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PLEASE HELP ME WITH THESE THREE QUESTIONS!!!!!!!!!!!!Some of the newest types of modern appliances are 100% efficient and lose no energy to heat. True False A perpetual motion machine is an invention that has only worked a few times in history. True FalseThermal pollution occurs when factories use water to cool down their heated machinery, and then release the heated water into rivers and oceans. True False

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