According to collision and transition state theories, what is the importance of activation energy?
A) Activation energy is increased when a catalyst is added.

B) Activation energy increases the temperature to heat up the transition state.

C) Activation energy provides enough energy for reactants to form the transition state.

D) Activation energy makes all reactions endothermic.

The molarity of glucose in blood before eating is  0.00666 M

Molar concentration is the degree of the concentration of a chemical species, especially of a solute in a solution, in phrases of quantity of a substance per unit quantity of answer. In chemistry, the most usually used unit for molarity is the variety of moles in line with liter.

We are given the human blood ranges from about 80 mg/dL before meals to 120 mg/dL after eating.

1 dL = 0.1 L

Mass of glucose before meal = 80 mg = 0.080 g

Mass of glucose after eating = 120 mg = 0.120 g

So, moles of glucose = 0.080 g / 180.16 g/ mol

                                 = 0.000444 moles

Moles of glucose = 0.120 g / 180.16 g/mol

                            = 0.000666 moles

So, molarity of glucose in blood before eating = 0.000444 moles / 0.1 L

                                                                              = 0.00444 M

molarity of glucose in blood after eating = 0.000666 moles / 0.1 L

                                                                  = 0.00666 M

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Answer: A. The sun's gravity is stronger.

Explanation: Gravity has to do with 2 factors, the mass of the object and the distance between the 2 objects.

The Sun's mass is immensely larger than the Earth's mass, so the sun's gravity would be stronger.

Answer:

c Two hydrogen one oxygen

Explanation:

H2O

Because water is a polar molecule and carbon dioxide is a nonpolar molecule, water has a greater boiling point than carbon dioxide. Since polar molecules have greater intermolecular interactions than nonpolar ones, polar molecules like water require more energy or heat to disintegrate.

It is highly challenging to break the bonds that make up the massive water molecule due to its substantial hydrogen bonding.

The temperature at which a chemical's vapor pressure equals atmospheric pressure is known as the boiling point.

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The question requires us to complete the sentences regarding characteristics and properties of lipids.

First, we need to keep in mind what are lipids: these essential molecules to cell's membranes are typically made of a glycerol backbone, fatty acid "tails" (the hydrofobic part) and and a phosphate group (a hydrophilic part). The term "lipids" is commonly used as a synonym for "fats", which it isn't completely wrong as they share many properties (for example, lipids don't mix with water).

As they are organic molecules, all lipids have carbon, oxygen and hydrogen in their structure, while some of them can contain other elements (such as phosphorus for the phospate group and nitrogen).

Considering the information above, we can complete the sentences as:

1. "Lipids is a general term describing organic molecules that are insoluble in water".

2. "All lipids are made of carbon, hydrogen and oxygen, while some lipids contain other elements..."

The identity of the unknown metal that has a mass of 51.842 grams when placed in a graduated cylinder is gold with 19.2g/mL.

Density of a substance is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated by dividing the mass of the substance by its volume as follows:

Density = mass ÷ volume

According to this question, an unknown metal has a mass of 51.842 grams. When placed in a graduated cylinder, the volume of water rose from 17.1 mL to 19.8 mL.

Volume of the metal = 19.8mL - 17.1mL = 2.7mL

Density = 51.842g ÷ 2.7mL

Density = 19.2g/mL

Gold has a density of 19.2g/mL, hence, confirms the identity of the metal.

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Answer:

if u combined them itd would be BN

"formaldehyde"

A naturally occurring organic substance with the chemical formula CH2O and the structural formula HCHO is formaldehyde. The pure substance, which is a strong, colorless gas that spontaneously polymerizes into paraformaldehyde, is kept in an aqueous solution that is also employed to preserve animal specimens.

At room temperature, volatile organic compounds (VOCs), which are organic chemicals, have a high vapour pressure. The ratio of the sample's molecule in the surrounding air, or volatility, is correlated with low boiling point with high vapor pressure.

Along with being pollutants, VOCs are also responsible for smells and perfumes' odor. VOCs are crucial for interaction among animals and plants, acting as attractants for pollinators, predator defense, and even interactions between individual plants. Some VOCs are harmful to the environment or pose a risk to human health. Laws are in place to control anthropogenic VOCs, especially indoors where concentrations are highest. Although the majority of VOCs are not immediately harmful, they may have long-term, chronic health impacts.

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The following statements from the given questions are correct.

There are 2 atoms of carbon in one molecule of acetic acid.

There are 4 moles of hydrogen atoms per mol of acetic acid.

If we look at the chemical formula of the acetic acid (CH3COOH) There are two carbon atoms.

The number of moles of Hydrogen is four because there are 4 hydrogen atoms present in acetic acid.

The remaining options are incorrect because the molar mass of acetic acid is 60.05 g/mol and there are 32.00 amu of oxygen per molecule of acetic acid.

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Answer:

A.the particulate theory of matter

Explanation:

Law of Definite proportions support the particulate theory of matter.

The law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass.

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Thus the final pressures of N₂ and H₂ are 825.7317torr and 550.6944torr respectively.

It is given that the Volume(V₁) of nitrogen is 30L and Pressure(P₁) of Nitrogen is 740torr and the temperature(T₁) is 55°C.

Similarly, for hydrogen, the volume(V₁) is 20L and Pressure(P₁) is 650torr and temperature(T₁) is 15⁰C.

These two are pumped into a container of Volume(V₂) of 25L and temperature (T₂) 32⁰C

To find the Final pressure of N₂, the following formula is to be used

P₁V₁/T₁ = P₂V₂/T₂

On substituting the values of P₁,V₁,T₁,V₂,T₂ we get P₂ of N₂ as,

(740x30)/328 = 25xP₂/305K

22200/328 =  25xP₂/305K

67.6829x305 = 25P₂

20643.2926/25 = P₂

825.7317torr = P₂

P₂= 825.7317torr

Therefore, the final pressure of N₂ is 825.7317torr

Similarly to find the final pressure of H₂ by applying the same formula we get,

P₁V₁/T₁ = P₂V₂/T₂

On substituting the values of P₁,V₁,T₁,V₂,T₂ we get,

(650x20)/288 = (P₂x25)/305

13000/288 = (P₂x25)/305

45.1388x305 = 25P₂

1376.3611/25 = P₂

550.6944 = P₂

P₂ = 550.6944torr

Therefore, the final pressure of H₂ is 550.6944torr.

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Step 1

Empirical formula definition:

In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound.

-----------------

Step 2

Information provided:

Composition,

50.7 % C

9.9 % H

39.4 % N

-----------------

Step 3

Assuming a 100 grams sample:

50.7 % C => 50.7 g C

9.9 % H => 9.9 g H

39.4 % N => 39.4 g N

-----------------

Step 4

The number of moles of each element is calculated as:

(Please, use your periodic table)

50.7 g C x (1 mole C/12.01 g C) = 4.22 moles C

9.9 g H x (1 mole H/1.008 g H) = 9.82 moles H

39.4 N x (1 mole N/14.00 g N) = 2.81 moles N

-----------------

Step 5

Each number in step 4 will be divided by the smallest one of the 3. It is also needed integer numbers.

4.22 moles C/2.81 moles N = 1.5

9.82 moles H/2.81 moles N = 3.5

2.81 moles N/2.81 moles N = 1

As we need integer numbers, we will multiply all these numbers by 2 as it follows:

C => 1.5 x 2 = 3

H => 3.5 x 2 = 7

N => 1 x 2 = 2

Therefore, the empirical formula will be:

Answer:

The coefficient in an equation for a chemical reaction that is balanced reveals some details about the chemical process.

An equation for a chemical reaction is considered to be balanced if both the reactants and the products have the same number of atoms and total charge. In other words, the mass and charge balances on both sides of the reaction are equal.

The coefficient in a balanced chemical reaction equation provides us with the following details about the reaction:

Coefficient tells us, the relative number of moles of each substance involved in a chemical reaction.

For example,

2H₂ + O₂----> 2 H₂O

That's mean, 1 moles of oxygen gives 2 moles of H₂O on reacting with 2 mol of Hydrogen.

The coefficient in a chemical equation tells us also, the number of molecules of reactants and

products involved in a chemical reaction. For example,

N₂ + 3 H₂. -----> 2 NH₃.

Their are, 1 molecule of Nitrogen and 3 molecules of Hydrogen gives 2 molecules of  NH₃. therefore

coefficient tells us this information also.

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The pH of a buffer that was prepared by adding 3. 96 g of sodium benzoate, NaC₇H₅O₂, to 1.00 L of 0.0100 M benzoic acid,  HC₇H₅O₂ is 4.63.

Given that :

Ka = 6.3 × 10⁻⁵

The equation :

HA  +   H₂O   ---->   H₃O⁺  +  A⁻

A⁻  = C₇H₅O₂⁻

The formula  is given as :

pH = pKa  +  log [A⁻] / [HA⁻]

pKa  =  - log Ka = - log ( 6.3 × 10⁻⁵ ) = 4.20

[A⁻ ] = [C₇H₅O₂⁻] = NaC₇H₅O₂  

       = 3.96 g  / 144.10 g

       = 0.0274 / 1 L = 0.027 mol / L

[HA] = 0.0100 moll / L

substituting the value in the formula:

pH = pKa  +  log [A⁻] / [HA⁻]

pH = 4.20 + log ( 0.0274 / 0.0100 )

     = 4.20 + 0.439

     = 4.63

pH = 4.63

Thus, The pH of a buffer that was prepared by adding 3. 96 g of sodium benzoate, NaC₇H₅O₂, to 1.00 L of 0.0100 M benzoic acid,  HC₇H₅O₂ is 4.63.

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Answer: three primary types of bonding: ionic, covalent, and metallic. Definition: An ionic bond is formed when valence electrons are transferred from one atom to the other to complete the outer electron shell.

Explanation:

For stability of any molecule or element , molecule has to follow octet rule. There are so many exceptions to this rule. the correct option is option D

According to octet rule an element or molecule is stable only if it contains 8 electron in its valence shell

According to our question there all valence electron total of 16 electron. This electron is counted by adding bonding and nonbonding electron. If there will be total valence electron of 16 or more than this  then there must be expanded octet which leads to instability. For this reason there must be valence electron less than 16

Therefore No, the octet rule means there are 8 valence electrons around each atom, but bonding electrons get counted for the atoms on both sides of the bond, so there are normally fewer than 16 valence electrons unless there is an expanded octet. The correct option is option D

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Your question is incomplete, but most probably your full question was,

Does the octet rule mean that a diatomic molecule has 16 valence electrons? Select from the following:

A. Yes, each atom has 8 valence electrons. Two atoms, with 8 electrons each, is 16 valence electrons.

B. No, the octet rule means there are always 8 valence electrons and only 8 valence electrons.

C. Most of the time there are 16 valence electrons, but there are exceptions to the octet rule (odd-electron species, expanded octets, etc.) that could make it more or less than 16.

D. No, the octet rule means there are 8 valence electrons around each atom, but bonding electrons get counted for the atoms on both sides of the bond, so there are normally fewer than 16 valence electrons unless there is an expanded octet.

Barrier that must be overcome before products are formed in a spontaneous reaction is Activation energy barrier.

A spontaneous response is a response that favors the formation of products on the conditions underneath which the response is occurring. A roaring bonfire is an instance of a spontaneous response, in view that it is exothermic (there is a decrease inside the power of the system as energy is released to the environment as warmth).

Maximum spontaneous chemical reactions are exothermic - they release warmness and heat up their surroundings: for instance: burning wooden, fireworks, and alkali metals introduced to water. When a radioactive atom splits up, it releases strength: that is a spontaneous, exothermic nuclear reaction.

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The improved telescope showed scientists that the solar system contained comets.

The solar system has to do with the arrangement of the sun and the planets. The sun lies at the center of the solar system and then the sun is surrounded by the planets that move all around the sun in concentric circles.

Now we know that the telescope is the kind of object that could be used in the study of the outer space. We could use it to study the stars as well as other celestial bodies in the study of astronomy.

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A)compute the mole of AgNO3 first.

volume, when V=1.92 L

use:

amount of mole,

n = Volume * Molarity

  = 0.18*1.92

  = 0.3456 mole

In light of the balanced equation

AgNO3 = (2/2)*moles of AgCl produced

            = (2/2)*0.3456

           = 0.3456 mole

This is the quantity of AgCl moles.

AgCl molar mass,

MM equals 1*MM(Ag) + 1*MM (Cl)

    = 1*107.9 + 1*35.45

    = 143.35 g/mole

use: volume of AgCl,

M = Molar Mass * Molar Number

   = 1.434*102 mole/mole x 0.3456 mole

   = 49.54 g

Response: 49.5 g

B)Here: AgNO3 = M=0.18 M

V(AgNO3)=1.92 liters

V (MgCl2) = 3.83 L

A balanced response states:

1 mole of AgNO3 = 2 mole of MgCl2, and vice versa.

2*M(MgCl2)*V = 1*M(AgNO3)*V(AgNO3) (MgCl2)

1*0.18*1.92 = 2*M(MgCl2)*3.83

0.0451 M (MgCl2)

Response: 0.0451 M

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Answer:

The electrons surrounding an atom are located in regions around the nucleus called “energy levels”. An energy level represents the 3-dimensional space surrounding the nucleus where electrons are most likely to be. The first energy level is closest to the nucleus.

hope it helps you

Answer: Energy Levels

Explanation: Key Concepts. The electrons surrounding an atom are located in regions around the nucleus called “energy levels”. An energy level represents the 3-dimensional space surrounding the nucleus where electrons are most likely to be. The first energy level is closest to the nucleus.

ANSWER

he number of atoms of lithium is 5.039 x 10^24 atoms

EXPLANATION

Given that;

The number of moles of lithium is 8.37 mol

Follow the steps below to find the number of atoms of lithium

Recall, that the Avogadro's number is 6.02 x 10^23

Therefore, the number of atoms of lithium is 5.039 x 10^24 atoms

d. Construction, deforestation, agriculture, overgrazing, urbanization​

The process of removing soil, rock, or dissolved material from one area on the Earth's crust and moving it to another, where it is deposited, is known as erosion. Erosion differs from weathering, which is a static process.

Earthen materials are worn away during erosion, a geological process in which they are moved by wind or water. Weathering, a related process that does not involve movement, dissolves or breaks down rock.

The movement of loose rock, soil, and sand fragments from one place to another is called erosion. All landforms on the earth's surface, including mountains, deserts, and coastlines, are impacted by erosion. One of the main reasons for erosion is water.

the effects of erosion

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PF5 molecule is predicted to have a molecular geometry that is trigonal bipyramidal.

You may recognize PF5 on a VSEPR chart as a compound with a trigonal bipyramidal molecular structures once you know it has five electron pairs. The equatorial-equatorial bonds are 120 ° distant from one another, while all other bond angles are 90 °, giving it a total of two bond angles of 90 ° and 120 °.

Valence shell electron pair repulsion is the name given to the underlying concept in molecular structures (VSEPR). In essence, it states that because electron pairs are made up of negatively charged particles, they are attracted to one another and try to keep as far apart as possible.

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Answer:

Energy = 3.77 × 10⁻²⁸ J; radio wave.

Explanation:

In order to calculate the energy of an electromagnetic wave given its frequency, we have to use the following formula:

[tex]\boxed{E = hf}[/tex],

where:

• E = energy of wave

• h = Planck's constant (6.63 × 10⁻³⁴ m² kg / s)

• f = frequency of wave (5.68 × 10⁵ Hz)

Using the formula and information above, we can calculate the energy of the wave:

E = 6.63 × 10⁻³⁴  ×  5.68 × 10⁵

  = 3.77 × 10⁻²⁸ J

Therefore, the energy of the wave is 3.77 × 10⁻²⁸ J, and it is a radio wave, as radio waves have frequencies of magnitude 10⁴ to 10⁵ Hz.

The Oobleck mixture is neither a liquid nor a solid. The cornstarch-and-water solution produces a fluid that behaves more like quicksand than water applying force causes it to thicken.

A mixture is a substance made up of two or more chemical components that do not combine chemically.

A compound produced by combining two or more different ingredients without triggering a chemical reaction is another way to describe it.

There are two types of mixture.

Thus, the Oobleck mixture is neither a liquid nor a solid. The cornstarch-and-water solution produces a fluid that behaves more like quicksand than water applying force causes it to thicken.

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Answer:

A

Explanation:

Radiant energy.......

The problem with non-renewable resources is given enough time, we run out of them

Non renewable resources means the energy resources include coal, natural gas, oil and also nuclear energy and once this resources are used up then they cannot be replaced again which is the major problem fir humanity and if we run out of non renewable resources then the global economy will be constrained to a semi local condition as there will be no more fuel to move product around so this is also the problem with non renewable resources

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The most prevalent indicators used in complexometric titrations are organic dyes, which work by generating a clouded complex with the metal ion under test.

The indicator is replaced by EDTA during the reaction to create a more stable complex with the metal, and after the reaction is finished, the colour is changed.

The acronym EDTA stands for ethylenediaminetetraacetic acid. For the titration, an excessive amount of EDTA is used to react with the sample solution's calcium and magnesium ion titrations. When the indicator is applied, it stays blue because the EDTA has complexed with all of the Ca2+ and Mg2+ ions present  for titrations.

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