Use the chemical equation and the bond diagram to answer the question.

2H2 + O2 → 2H2O

2H–H + O=O → 2H–O–H

The energy of the H–H bond is 432 kJ/mol. The energy of the O=O bond is 498 kJ/mol. The energy of the O–H bond is 467 kJ/mol.

Which bond is the weakest?

(1 point)

O–H


H–H


O–O


O=O

Answer:

video and through an algebriac expression

Explanation:

Answer:

B. to counteract the sourness of the acids

Explanation:

Edge:) Good luck!

Answer:

B. to counteract the sourness of the acids

Explanation:

B. to counteract the sourness of the acids

Answer:

the anserw should be 665KJ

Answer:

I'm pretty sure that the answer is c

Answer:

Knowing your lab equipment and their names will aid in having a successful experiment and may help in correcting errors.

If you do not know your lab equipment, that will only result in having a lack of knowledge of the equipment or not knowing how to correct a mistake in an experiment.

Explanation:

Hope I helped.

Answer:

Both are chemical changes because new substances are formed.

Explanation:

in both examples new substances are formed, meaning it is a chemical chang. It cannot be a physical change since it doesn’t involve a chnage in its shape, volume, length, or mass

To solve this, we must know each and every concept behind chemical change and physical change. Therefore, thee correct option is option A that is both are chemical changes because new substances are formed.

Chemical change is a reaction in which forming and breaking of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same.

A physical change is characterized by a differences in physical attributes. Melting, transformation to a gas, changes in strength, change in durability, changes in crystal structure, texturing change, shape, color, volume, and density are all examples of physical qualities. Tempering steel to make a knife blade is an instance of a physical change.

One famous example of chemical change is iron rusting. The arrangements , odor and colour of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.  Ripening of banana is also a chemical change.

Therefore, thee correct option is option A that is both are chemical changes because new substances are formed.

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I think option b is the answer

Explanation:

from definition of density we have

density=mass/volume

and density=55 mass=220g

volume=220/55

volume=4ml

or 4×10^-3l

Answer:

4cm³

Explanation:

220.0g is our mass

55.0g/cm³ is our density

220g/55g/cm³

= 4cm³

Answer:

16

Explanation:

the number a grams is 16

Answer:

Roughly 471.96589800000004. Hope i helped :D

Explanation:

Answer:

no not technically most of the time it is just their miles and maybe their esophagus, and also your stomach if you're lucky. Most of the time the ice cream isn't cold all the way down it is warmed up or by your core body temperature. The only way your full body would be cold when you eat ice creams if you are already cold in your and your core temperature has dropped.

Answer:

It means he could do 100 joule of work in 1 second.

Explanation:

It means he could do 100 joule of work in 1 second.

From what we know, we can confirm that the ideal Gas Law does not apply and gases are considered real under conditions of low temperature and high pressure.

This law is used to describe how gasses will behave under normal conditions. However, it is not always accurate in certain conditions, the requirement for conditions to be ideal resulted in the name of the ideal gas law. This law fails at low temperatures and high pressure due to the low volume occupied by the gas under these conditions.

Therefore we can confirm that the ideal Gas Law does not apply and gases are considered real under conditions of low temperature and high pressure.

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Answer:

A and D

Explanation:

i have finish with your assignment.

Answer:

*

Explanation:

- The geocentric model was unable to properly explain these changes in the inferior planets' appearance.

- All objects, including the moon, sun, and stars, have been shown to orbit around the Earth in the geocentric theory, whereas all other objects, including the Earth, moon, and stars, are said to circle around the Sun in the heliocentric theory.

Answer:

CH2O4

Explanation:

empirical formula for C2H4O8 is CH2O4

Volume is the amount of space occupied by any object or substance in a given defined space it can be expressed in litres. The volume of the balloon is 5.8 L.

Volume is a defined space occupied by any substance in a confined place with some amount of weight or mass.

The volume of the balloon can be estimated by the ideal gas equation:

[tex]\rm PV = n RT[/tex]

Where,

Substituting values in the equation:

[tex]\begin{aligned} \rm V &= \rm \dfrac{nRT}{P}\\\\&= \dfrac{(0.24)(0.082)(308)}{1.05}\\\\&= 5.8\;\rm L\end{aligned}[/tex]

Therefore, the volume of the balloon is 5.8 L.

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Answer:

i do not know

Explanation:

Explanation:

Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.

Answer:

Biochemical compounds make up the cells and other structure of organism and carry out life processes.Carbon is the basic of all biochemical compounds so carbon carried life process on the earth

Precautions need to be observed when using methanol and a flame are wearing a mask and gloves, performing experiment from a distance and in a careful and safe way.

Methanol burns with a clear, clean flame which is dangerous if not carried properly. Wearing a mask and gloves during experiment in order to safe the hands and face from burning.

Performing experiment from a distance and in a carful way avoids the chances of accident so we can conclude that wearing a mask and gloves, performing experiment from a distance and in a careful and safe way are the precautions are needed.

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Answer:

0.3 moles of H2 will be produced.

Explanation:

           Balanced reaction: 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Given Al mass = 5.4 g, we know Mr of Al is 27

Using the formula:

moles = mass / Mr

moles of Al = 5.4 / 27

moles of Al = 0.2 moles

Here we see that "2" molar mass before Al; so in this reaction, "1" molar mass will have [(0.2)/2] = 0.1 moles. He see "3" molar mass before H2, therefore moles of H2 is (3 * 0.1) = 0.3 moles.

Balanced chemical equation is given by

[tex]\\ \tt\hookrightarrow 2Al+HCl\longrightarrow 2AlCl_3+3H_2[/tex]

Moles of Al:-

[tex]\\ \tt\hookrightarrow 5.4/27=0.2mol[/tex]

Now

A gene is the basic unit of an organism. Gene is encompassed inside the nucleus  of a cell where all the chromosomes and DNAs are located. Thus option A is correct.

Chromosomes are genetic materials contained in a gene inside the nucleus of a cell. There are different number of chromosomes in each level of organisms.

Chromosomes are made of proteins and DNA (deoxyribonucleic acid). it is a thread like structure having a knot in the center. In human beings there are 23 pairs of chromosomes in each cell.

Chromosomes are transferred to the offspring from the parents and thus they are the genetic material inherited from the parents.  Thus gene is the functional unit of heredity. Genes codes each proteins and are responsible for the characteristics of each organism.

Therefore, gene is a structure that contains many chromosomes. Hence, option A is correct.

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Taking into account the reaction stoichiometry and limiting reagent, 9 grams of NO can be produced from 12 g of NH₃ and 12 g of O₂.

In first place, the balanced reaction is:

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 68 grams of NH₃ reacts with 160 grams of O₂, 12 grams of NH₃ reacts with how much mass of O₂?

[tex]mass of O_{2} =\frac{12 grams of NH_{3}X160 grams of O_{2} }{68 grams of NH_{3}}[/tex]

mass of O₂= 28.23 grams

But 28.23 grams of O₂ are not available, 12 grams are available. Since you have less mass than you need to react with 12 grams of NH₃, O₂ will be the limiting reagent.

Considering the limiting reagent, he following rule of three can be applied: if by reaction stoichiometry 160 grams of O₂ form 120 grams of NO, 12 of O₂ form how much mass of NO?

[tex]mass of NO=\frac{12 grams of O_{2} x120 grams of NO}{160 grams of O_{2}}[/tex]

mass of NO= 9 grams

Then, 9 grams of NO can be produced from 12 g of NH₃ and 12 g of O₂.

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Answer:

limiting reactant

Explanation:

it is consumed totally

Answer:

The molecular weight of the unknown gas is 16.1 g/mol.

The bond length and energy of the bond formed between hydrogen (H) and astatine (At) would change if the bond order increases or decreases or when its potential energy is at the lowest.

Bond length is also referred to as bond distance and it can be defined as an equilibrium distance between the nuclei of two (2) covalently bonded atoms in a molecule.

Bond energy can be defined as the amount of chemical energy that is required to break one mole of a given chemical bond.

In Chemistry, the bond length and energy of a molecule is typically determined by the following:

In conclusion, you can predict that the bond length and energy of the bond formed between hydrogen (H) and astatine (At) would change if the bond order increases or decreases or when its potential energy is at the lowest.

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Considering the definition of physical property, a physical property is a characteristic that describes an object or substance and can be measured without affecting the composition or identity of the substance.

A physical property is a characteristic that describes an object or substance and is based primarily on the structure of the object, substance or matter, which is visible and measurable.

That is, physical properties are those that can be measured without affecting the composition or identity of the substance. In this way, the physical properties of matter are the visible and characteristic characteristics of a substance that can be measured and do not produce new chemical substances.

Some examples of physical properties are: color, shape, size, density, melting point and boiling point.

A physical property is a characteristic that describes an object or substance and can be measured without affecting the composition or identity of the substance.

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Answer:

➢There are different ways to trigger the conversion of diamond to graphite, for instance by simply heating the diamond under exclusion of oxygen or even with an aimed mechanical stroke.

Explanation:

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Answer:

d

Explanation:

The amount of time it will take for the 40g sample to get cut in half is 30 minutes