Use the pictures shown to identify three ways of drawing hydrocarbon molecules.
Then write the molecular formulas. (1 point each)

Answer:

200 moles of nitric acid are produced from 300.00 mol of nitrogen dioxide.

Explanation:

You know that the balanced reaction is:

3 NO₂ + H₂O ⇒ 2 HNO₃ + NO

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

So:

[tex]x=\frac{c*b}{a}[/tex]

In this case, the rule of three can be applied in the following way: if 3 moles of NO₂ produce 2 moles of HNO₃ by stoichiometry of the reaction, 300 moles of NO₂ how many moles of HNO₃ do they produce?

[tex]moles of HNO_{3} =\frac{300 moles of NO_{2}*2 moles of HNO_{3}}{3 moles of NO_{2}}[/tex]

moles of HNO₃= 200

200 moles of nitric acid are produced from 300.00 mol of nitrogen dioxide.

Answer:

200.0 mol

Explanation:

im smart :)

Answer:

glamorize

Explanation:

There are many stories about celebrities being on drugs, and the media seems to deliver the stories in a way that acts as drugs are beneficial and further glamorizes them.

News coverage tends to glamorize drug use.

An examination performed by the national middle on addiction and Substance Abuse at Columbia college discovered that young adults who frequently use popular social media outlets have been more likely to drink, use pills, and buy tobacco than adolescents who both did no longer use social media or used it less regularly.

The effects display that the media impact on the human populace cannot exchange the stabilities of equilibria however can affect the number of drug addicts. Sensitivity analyses are performed to search for powerful control measures for drug treatment.

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Answer:

Temperature, mass, and the type of material are factors that affect the thermal energy of an object.

Material with the higher specific heat will have more thermal energy than material with lower specific heat if they both have the same mass and temperature.

The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.

If two materials have the same mass and temperature, the material with the greater specific heat will have more thermal energy than the material with the lower specific heat.

How does thermal energy transfer depend on the kind of material?

The speed at which thermal energy moves from one end of a substance to another determines thermal conductivity. Insulators transport thermal energy slowly while conductors transfer thermal energy quickly.

The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.

Conduction, convection, or radiation are all ways that thermal energy can be moved from one location to another.

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Answer: the acid

Explanation:

Answer:

A

Explanation:

The purpose of the periodic table was to organize elements as they were discovered into periods and groups, according to their properties. It was not just a naming of elements, as a list.

The purpose of the periodic table was to organize elements as they were discovered. Thus option A is correct.

Periodic table is defined as an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes.

It can also be defined as a tabular arrangement of chemical elements ordered by increasing atomic number and element groups.

It helps us to learn about an ordered grouping of the 118 known chemical elements.

The periodic table contains alkali metal, alkaline earth metal, transition elements, noble gas, post transition element etc. and many more elements are arranged in periodic table in groups.

Thus, the purpose of the periodic table was to organize elements as they were discovered. Thus option A is correct.

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Answer:

A, a solution made by dissolving 60g of sodium hydroxide in 2000cm³

Explanation:

Concentration = no. of moles / volume (in dm³)

1 dm³ = 1000cm³

no. of moles = mass / molar mass

molar mass of NaOH = 23.0+16.0+1.0 = 40 g/mol

Let's find the concentration of each of the solutions:

A:

= 60/40 /2

= 0.75 mol/dm³

B:

= 40/40 /1

= 1 mol/dm³

C:

= 10/40 / 0.25

=1 mol/dm³

D:

= 20/40 / 0.5

= 1 mol/dm³

Since 0.75mol/dm³ is the lowest concentration out of 4, it is the most dilute.

Answer: because ch4 is not considered a acid they said it is too weak

Explanation:

to remove iodine sublime

to remove sand filter

to remove water evaporate

Explanation:

1. put the mixture in a beaker

2.Heat the mixture using a watch glass filled with cold water, the iodine will sublime at the base of the watch glass.

3.Add water to sand and salt. Stir for salt to diffuse in the water

4.Filter sand from the solution using a filter paper

5.evaporate the remaining water to remain with Salt crystals.

Answer:

pseudoscience

Explanation:

srry that this is so late btw, hope this helps...

Answer:

Science

Explanation:

First response is NOT correct

Answer:

The answer is option B.

Hope this helps you

Answer:

equal number of electrons and protons

Explanation:

electron is negatively charged and proton is positively charged for an atom to stay neutrality # of electrons and protons must be equal.

Answer:

Reasons water is important

Imagine earth without water. The soil, with no water in it and nothing growing on it, would be lifeless, dead, collapsed into dust, sand, clay or rock.

-Water consumption helps lubricate and cushion your joints, spinal cord, and tissues. This will help you enjoy physical activity and lessen discomfort caused by conditions like arthritis.

-Water is a main component of saliva. Saliva also includes small amounts of electrolytes, mucus, and enzymes. It’s essential for breaking down solid food and keeping your mouth healthy.

Answer:A

Explanation:

They are very reactive is a characteristic property of halogen.

Hence, Option (A) is correct answer.

Halogens are non metallic elements in periodic table. It belongs to group 17 in the periodic table. Halogen family consists six elements that is Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At) and Tennessine (Ts).

Thus, from the above conclusion we can say that They are very reactive is a characteristic property of halogen.

Hence, Option (A) is correct answer.

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Answer:

88 mL of water.

Explanation:

Data obtained from the question include the following:

Volume of alcohol = 12 mL

Percentage of alcohol = 12%

Volume of water =..?

We can thus, obtain the volume of water needed to make 12% of the alcohol solution as follow:

Percentage of the solution = 100%

Percentage of alcohol = 12%

Percentage of water =?

Percentage of water = percentage of solution – percentage of alcohol

Percentage of water = 100 – 12

Percentage of water = 88%

Since 12% of alcohol is equivalent to 12 mL of alcohol, therefore 88% of water will also be equivalent to 88 mL.

Therefore, 88 mL of water is needed to make 12% of alcohol.

Answer:

x = 25.02 or 25°c

Explanation:

Given:

mass of water : 7.50×10² =750 gm

Ccal = 8.20× 10² = 820 J/°c

Let assume final temp = x°c

then, heat gained by the water + heat gained by calorimeter

= 25400 J

⇒ Mw × Cw× ΔTw+ Ccal ×ΔT = 25400

⇒ 750× 4.184 × (x - 18.6) + 820 ×(x-18.6) = 25400

⇒ x = 25.02 or 25°c

Answer:

Metals:

Copper: to make cooking utensils such as pots because it has a high heat conductivity.

Aluminium: to make aluminium foil / soda cans because it is malleable

Mercury: fills up thermometers because it can indicate the temperature when it expands. But it is toxic so fewer people are using mercury thermometers now.

Titanium: to make the body of supersonic aircrafts because it is strong and corrosion resistant

Gold: to make jewelry because it is shiny and also corrosion resistant

Non-metals:

Nitrogen: to fill up chip packages because its molecules are unreactive

Helium: to fill up balloons because it is lightweight

Hydrogen: for generating electricity in hydrogen fuel cells. It is environmentally-friendly because it does not produce any greenhouse gas or toxic pollutants.

Fluorine: added in toothpaste for strengthening the teeth. It can also prevent cavities.

Carbon: the graphite in pencils. this is one form of carbon. Other common forms (allotropes) of carbon include diamond and Buckminsterfullerene (buckyball).

Answer:

(c) 82%

Explanation:

Using the chemical reaction:

3CH₃OH + 4MnO₄⁻ → 3HCOOH + 4MnO₂ + 4e⁻

3 moles of methanol produce 3 moles of formic acid (Reaction 1:1)

To find the percent yield we need to calculate theoretical yield of the reaction when 12g of methanol (Molar mass: 32.04g/mol) are reacting, thus:

12g ₓ (1mol / 32.04g) = 0.3745 moles of methanol are in 12g.

As 1 mole of methanol produce 1 mole of formic acid, assuming a 100% of yield in the reaction (Theoretical yield) moles produced of formic acid are 0.3745 moles.

Using molar mass of formic acid (46.03g/mol), mass of the acid in 0.3745moles are:

0.3745 moles ₓ (46.03g/mol) = 17.2g of formic acid are theoretical yield

Percent yield is calculated as:

(actual yield / Theoretical yield) × 100

As actual yield of the reaction is 14g. Theoretical yield is:

(14g / 17.2g) × 100 = 81.2% ≈ 82%

Right answer is:

The percentage yield of the reaction is 82%

The correct answer to the question is Option C. 82%

We'll begin by writing the balanced equation for the reaction.

3CH₃OH + 4MnO₄⁻ → 3HCOOH + 4MnO₂ + 4e⁻

Molar mass of CH₃OH = 12 + (3×1) + 16 + 1 = 32 g/mol

Mass of CH₃OH from the balanced equation = 3 × 32 = 96 g

Molar mass of HCOOH = 1 + 12 + 16 + 16 + 1 = 46 g/mol

Mass of HCOOH from the balanced equation = 3 × 46 = 138 g

From the balanced equation above,

96 g of CH₃OH reacted to produce 138 g of HCOOH

From the balanced equation above,

96 g of CH₃OH reacted to produce 138 g of HCOOH.

Therefore,

12 g of CH₃OH will react to produce = (12 × 138)/96 ≈ 17g of HCOOH.

Actual yield of HCOOH = 14 g

Theoretical yield of HCOOH = 17 g

Percentage yield = Actual / Theoretical × 100

Percentage yield = 14/17 × 100

The correct answer to the question is Option C. 82%

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Answer:

The enzyme's active site must be the mold shape of the substrate.

Explanation:

An enzyme and a substrate bind together in order to work. If the shapes of the 2 are different, they will not be able to bond together. If the shapes of the 2 fit glove-in-hand, then they will be able to bond together.

Answer:

Option C. 8.91g

Explanation:

The balanced equation for the reaction is given below:

2Pb(NO3)2 —> 2PbO + 4NO2 + O2

Next, we shall determine the mass of Pb(NO3)2 that decomposed and the mass PbO produced from the balanced equation.

This is illustrated below below:

Molar mass of Pb(NO3)2 = 207 + 2[14 + (16x3)]

= 207 + 2[14 + 48]

= 207 + 2[62] = 207 + 124

= 331g/mol

Mass of Pb(NO3)2 from the balanced equation = 2 x 331 = 662g

Molar mass of PbO = 207 + 16 = 223g/mol

Mass of PbO from the balanced equation = 2 x 223 = 446g

Summary:

From the balanced equation above,

662g of Pb(NO3)2 decomposed to produce 446g of PbO.

Finally, we can obtain the maximum mass of lead(II) oxide, PbO produced from 13.23g of lead (II) nitrate, Pb(NO3)2 as follow:

From the balanced equation above,

662g of Pb(NO3)2 decomposed to produce 446g of PbO.

Therefore, 13.23g of Pb(NO3)2 will decompose to produce = (13.23 x 446)/662 = 8.91g of PbO.

Therefore, 8.91g of PbO were obtained from the decomposition of 13.23g of Pb(NO3)2

Answer:

A. Supersaturated

Explanation:

i got it right on edge 2021

The heated solution that holds more dissolved solution than it can hold at a lower temperature is supersaturated solution. Therefore, option A is correct.

A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. By introducing a tiny solute crystal known as a seed crystal, the excess dissolved solvent in a super-saturated solution can begin to recrystallize.

A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. A solution is considered supersaturated if it contains more solute than is necessary to saturate it.

A solution that contains more solute than it can hold at a specific temperature is said to be supersaturated. Usually, raising a solution's temperature causes more particles to dissolve, increasing the solute concentration.

Thus, option A is correct.

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Answer:

Oxidation with FAD is more favorable energetically.

Explanation:

With FAD as the electron acceptor;

∆E'° = (E'° from reduction reaction) – (E'° from oxidation reaction)

∆E'° = (-0.219) - 0.031 = -0.25 V

The standard free energy change, ∆G'° = -nF∆E'° ; where n is number of moles of electrons = 2, F is Faraday's constant = 96.5 KJ/V.mol

∆G'° = -2 × 96.5 KJ/V.mol × (-0.25)

∆G'° = 48.25 KJ/mol

With NAD+ as electron acceptor

∆E'° = (E'° from reduction reaction) – (E'° from oxidation reaction)

∆E'° = (-0.320) - 0.031 = -0.351 V

The standard free energy change, ∆G'° = -nF∆E'° ; n = 2, F = 96.5 KJ/V.mol

∆G'° = -2 × 96.5 KJ/V.mol × (-0.351)

∆G'° = 67.74 KJ/mol

From the above values obtained, the oxidation by FAD is more favorable energetically as the free energy is less positive than with NAD+

Answer:

a. single replacement reaction

Explanation:

Mg(s) + 2HCl(aq)——-> H2(g) + MgCl2(aq)

Mg replaces H, so this is a single replacement reaction.

Answer:  A.  1.07 x 10∧ -18 J

Explanation:

The energy can be calculated by using this relation; E = hc / ∧

Where E = energy

            h = Planck's constant = 6.626 x 10-34joules

            c  = speed of light =  3.00 x 10∧8 m/s

            ∧  = wavelenght  = 185 nm = 185 x 10∧ -9m

Therefore;  E=  hc / ∧

                     =  (6.626 x 10-34 j/s)  x  ( 3.00 x 10∧8 m/s)  /  185 x 10∧ -9m

                     =    1.987 x 10 ∧ -25 / 185 x 10∧ -9m

                     =  1.07 x 10∧ -18 J

Answer:

The answer is option B.

3.

Hope this helps you

option A is the correct one

It represents Mp orBp of a substance at a specific pressure

Answer:

A. +2

Explanation:

When neutral atom loses electrons, number protons(+)  becomes more than number of electrons(-), so charge of ion is positive.

Answer:

b

Explanation:

a drug problem consumes the bulk of a persons income because drugs are expensive to buy

A drug problem can quickly consume the bulk of a person income

A drug is any chemical substance that causes a change in an organism's physiology or psychology when consumed. Drug abuse or substance abuse refers to the use of certain chemicals for the purpose of creating pleasurable effects on the brain.

Drug use can have significant and damaging short-term and long-term effects. Taking some drugs can be particularly risky, especially if you take high doses or combine them with other drugs or alcohol.

People of any age, sex or economic status can become addicted to a drug. Certain factors can affect the likelihood and speed of developing an addiction.

The best way to prevent an addiction to a drug is not to take the drug at all. If your doctor prescribes a drug with the potential for addiction, use care when taking the drug and follow the instructions provided by your doctor. Thus you can save your income.

The correct answer is option B.

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Explanation:

Before proceeding to answering the question, we have t understand what we mean by both mixture and compound.

A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

A compound on the other hand is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.

The two other reason why H2SO4 is a compound and not a mixture are;

1)  The components which are Hydrogen, Sulphur and Oxygen cannot be separated by physical means.

2) It has a constant melting and boiling point.

Answer:

+ 100 Kj

Explanation:

The very minimum energy required to activate atoms or molecules to undergo chemical transformation.

Answer:

It is 60kj.

Explanation:

It is the highest point minus where a+b is at, so it is 60kj.