What is the main chemical component present in striking surface of a matchbox?

A. Potassium chlorate

B. Phosphorus

C. Potassium

D. Graphite​

Answers

Answer 1

Answer:

Phosphorus

Explanation:

Actually that's red Phosphorus

The matchstick contains potassium chlorate at topOn reaction between these when we slides them white Phosphorus is formed which burns the match sticks
Answer 2

Answer:

Option B. ( Phosphorus)

Explanation:

Here, we want to select the option which is the main component present in the striking surface of a matchbox

The correct choice here is phosphorus

Red phosphorus which is an allotrope of phosphorus finds use in this particular case. It is the main chemical component present in the striking surface of a matchbox.

Hope this helps!

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Related Questions

Find δg o for the following reaction, using δh o f and s o values. H2(g) i2(s) → 2 hi(g)

Answers

The  standard change in free energy is -35.76 kJ/mol. Values of standard free energy are obtained from thermodynamic tables.

What is the standard change in free energy?

The standard change in free energy can  be obtained using the relation;

ΔG°= ΔH° - TΔS

When;

ΔH°f(HI) = 26.466 kJ/mol

ΔH°f(H2) = 0 kJ/mol

ΔH°f(I2) = 0 kJ/mol

ΔS°f(HI) = 221.63 J/K/mol

ΔS°f(H2) = 145.64 J/K/mol

ΔS°f(I2) = 0 J/K/mol

Hence;

ΔH°freaction = [ 2(26.466)] - 0

= 52.932 kJ/mol

ΔS°freaction = [2(221.63 ) ] - [145.64 + 0]

= 443.26 - 145.64 = 297.62 J/K/mol

ΔG°= 52.932 * 10^3 - [298 * 297.62 ]

ΔG°= -35.76 kJ/mol

The  standard change in free energy is -35.76 kJ/mol.

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The change in free energy for the given chemical reaction between hydrogen and iodine gas is -31.068 kJ/mol.

How do we calculate the free energy change?

Free energy change of any reaction will be calculated by using the below equation:

ΔG° = ΔH° - TΔS, where

ΔH° = change in enthalpy

T = absolute temperature = 298K

ΔS = change in entropy

Change in any quantity during the reaction will be find out by substracting the reactant values from product values.

Given chemical reaction is:

H₂(g) + I₂(g) → 2HI(g)

ΔH° = 2(26.466)] - 0 = 52.932 kJ/mol

ΔS = [2(206.6) ] - [131 + 0] = 413.2 - 131 = 282.2 J/K.mol = 0.282 kJ/K.mol

On putting values on above equation, we get

ΔG° = 52.932 - (298)(0.282) = -31.068 kJ/mol

Hence required free enrgy is -31.068 kJ/mol.

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If a reaction is second-order with respect to a particular reactant, when the concentration of that reactant is increased by a factor of 4, the reaction rate will _____

Answers

Answer:

A reaction is second order with respect to a reactant.

Rate =k[A]

2

(i) If the concentration of the reactant is doubled, the rate of reaction becomes 4 times .

(ii) If the concentration of the reactant is reduced to half, the rate of reaction becomes one fourth.

Explanation:

If a reaction is second-order with respect to a particular reactant, when the concentration of that reactant is increased by a factor of 4, the reaction rate will increased by factor 16.

How do we calculate the rate of second order reaction?

Rate of the second order reaction will depends on the concentrations of one second-order reactant or two first-order reactants as:
Rate(1) = k[A]²

If the concentration of reactant becomes 4 times the initial concentration then rate will be:

Rate = k[4A]²

Rate(2) = 16k[A]²

Rate(2) = 16Rate(1)

Hence rate will increased by 16 times.

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Assign an oxidation number to each element in the reaction. co(g) 2h2(g) → ch3oh(g) in co, the oxidation number of c is , and that of o is . in h2, the oxidation number of h is . in ch3oh, the oxidation number of c is , that of o is , and that of h is .

Answers

The oxidation state is the number of electrons gained and donated. The oxidation state of C is +2, O is -2, H is 0, and in methanol, C is +1, H is +1, and O is -2.

What is the oxidation number?

The oxidation number denotes the number of electrons donated and gained after the bond formation. In general, the oxidation state of free elements is zero, and of hydrogen when the bond to non-metal is +1 and with metals is -1.

The chemical reaction is given as,

[tex]\rm CO + 2H_{2} \rightarrow CH_{3}OH[/tex]

Here,

The oxidation number of carbon in carbon monoxide will be +2, and oxygen will be -2.

The oxidation number of hydrogen in dihydrogen will be zero, and in methanol, the oxidation number of carbon will be +1, hydrogen will be +1 and oxygen will be -2.

Therefore, the oxidation number of oxygen is -2 most of the time.

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5. Summarize: What do you think would happen to the convection currents in the atmospheres and
along the coastlines if the surface of the Earth warmed up? Do you think this could have any affect
on the convection in the mantle? Why or why not? Your answer should be at least 3 sentences in
length,

Answers

Answer:

Explanation:

Image result for Summarize: What do you think would happen to the convection currents in the atmospheres and along the coastlines of the surface of the Earth warmed up? Do you think this could have any affect on the convection in the mantle? Why or why not? Your answer should be at least 3 sentences in length,

As the magma cools and solidifies, the convection currents will stop and the Earth will become geologically dead.

1. How many moles are in 15.5 g of SO2

2. Find the mass of 1.50 mol C3H8?

3. How many moles is 1.50 x 1023 molecules of NH3 ?

4. Convert 2.50 x 1025 formula units of NaCl into grams.

5. Convert 3.60 mol CO2 into molecules

Answers

1. The number of mole in 15.5 g of SO₂ is 0.242 mole

2. The mass of 1.50 mole of C₃H₈ is 66 g

3. The number of mole of NH₃ that contains 1.5×10²³ molecules is 0.249 moles

4. The mass of NaCl that contains 2.5×10²⁵ formula units is 2429.4 g

5. The number of molecules present in 3.6 moles of CO₂ is 2.167×10²⁴ molecules

1. How to determine the mole of SO₂Mass of SO₂ = 15.5 gMolar mass of SO₂ = 32 + (2×16) = 64 g/mol Mole of SO₂ =?

Mole = mass / molar mass

Mole of SO₂ = 15.5 / 64

Mole of SO₂ = 0.242 mole

2. How to determine the mass of C₃H₈Mole of C₃H₈ = 1.5 moleMolar mass of C₃H₈ = 44 g/mol Mass of C₃H₈ =?

Mass = mole × molar mass

Mass of C₃H₈ = 1.5 × 44

Mass of C₃H₈ = 66 g

3. How to determine the mole of NH₃

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole of NH₃

Therefore,

1.5×10²³ molecules = 1.5×10²³ / 6.02×10²³

1.5×10²³ molecules = 0.249 mole of NH₃

4. How to determine the mass of NaCl

6.02×10²³ units = 58.5 g of NaCl

Therefore,

2.5×10²⁵ units = (2.5×10²⁵ × 58.5) / 6.02×10²³

2.5×10²⁵ units = 2429.4 g of NaCl

5. How to determine the number of molecules

1 mole of CO₂ = 6.02×10²³ molecules

Therefore,

3.6 moles of CO₂ = 3.6 × 6.02×10²³

3.6 moles of CO₂ = 2.167×10²⁴ molecules

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Which correctly describes the which correctly describes the relationship between a hydrate, water, and an anhydrous compound?
Heating an anhydrous compound forms water and a hydrate.
O Adding water to an anhydrous compound forms a hydrate.
O Combining an anhydrous compound and a hydrate produces water.
O Removing a hydrate from an anhydrous compound produces water.

Answers

Answer:

adding water to an anhydrous compound forms a hydrate.

Explanation:

The statement which correctly describes the relationship between a hydrate, water, and an anhydrous compound is adding water to an anhydrous compound forms a hydrate. The correct option is A.

What are anhydrous compounds?

Anhydrous means without water, so the compounds that do not contain water are anhydrous compounds. Some examples are sodium sulfate, hydrogen fluoride, etc.

Hydrates are the compounds that contain water as the H2O molecules. These compounds lose their structure if water molecules are removed from the compound.

So, when water is added to the anhydrous molecules, it converts into hydrates. An example is sodium sulfate decahydrate.

Thus, the correct option is A. Adding water to an anhydrous compound forms a hydrate.

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chinua reacts 37g of magnesium with 150g of sulfuric acid. what will be the total mass of the products of this reaction

Answers

the total mass is 187g. The total mass of the reactant is always equal to total mass of the products.

explanation:

as per the given details, the reactant involved in the reaction are 37g of magnesium and 150g of sulfuric acid . the total of the reactant is 187g.

An aqueous solution turns litmus red. The ph of this solution could be

Answers

If an aqueous solution turns litmus red, the pH of the solution could be the range of 1 - 6.

What is an acid?

An acid is a substance that is capable of producing only hydrogen ions (H+) when dissolved in water.

An acid posseses other unique characteristics and are as follows:

Acids are corrosive in their concentrated formAcids turn blue litmus redAcids are sour to taste

The pH range of an acidic substance is between 1-6.

Therefore, if an aqueous solution turns litmus red, the pH of the solution could be the range of 1 - 6.

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Draw the major organic product of the following friedel–crafts alkylation. (an excess of benzene is present. ) do not draw any aluminum byproducts

Answers

The Friedel–crafts alkylation provide a nice way of attaching an alkyl group to an aromatic compound.

What is Friedel–crafts alkylation?

The Friedel–crafts alkylation occurs when an alkyl group is added to an aromatic compound.

The reaction mechanism commences with the attack of an alkyl halide on an aromatic substrate using AlCl3 as a catalyst. This question is incomplete henece we can not draw the structure of the product. The alkyl portion of the alkyl halide is now attached to the aromatic compound at te end of the reaction.

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How many molecules is equal to 46.92 grams of SrF2

Answers

Answer:

125.6168064 is the answer

What is the attraction between water molecules called?.

Answers

It is called Hydrogen bonds

The molar mass of barium nitrate (ba(no3)2) is 261.35 g/mol. what is the mass of 5.30 × 1022 formula units of ba(no3)2? 0.0900 g 12.0 g 23.0 g 3,130 g

Answers

Molar mass is the ratio of the mass to that amount of the substance. The mass of the barium nitrate in the formula unit is 23.0 grams.

What is mass?

The mass of a substance is the product of the molar mass of the compound and the number of moles of the compound.

Given,

Molar mass of barium nitrate = 261.35 g/mol

If, [tex]6.022 \times 10^{23}[/tex] have a mass of 261.35 g/mol then, [tex]5.30 \times 10^{22}[/tex] formula units will have a mass of,

[tex]\begin{aligned}& = \dfrac{261.35 \times 5.30 \times 10^{22}}{6.022\times 10^{23}}\\\\&= 23.0\;\rm gm\end{aligned}[/tex]

Therefore, option C. 23.0 gm is the mass of barium nitrate.

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Answer:

C

Explanation:

23.0g

i don’t really know how to do this and need help

Answers

Answer:

Explanation:

To round the number to 3 significant figures, look at the first 4 digits: 3545 which will round to 355. The number in 3 significant figures will be 3,550,000.

[tex]\\ \sf\Rrightarrow 3545530[/tex]

[tex]\\ \sf\Rrightarrow 354553[/tex]

[tex]\\ \sf\Rrightarrow 35455[/tex]

[tex]\\ \sf\Rrightarrow 3545[/tex]

[tex]\\ \sf\Rrightarrow 355[/tex]

What determines whether atoms will form chemical bonds.

Answers

Answer:

The electron arrangement of the outer energy level of an atom determines whether or not it will form chemical bonds.

Explanation:

What is qualitative and quantitative?​

Answers

Answer:

Quantitative data refers to any information that can be quantified, counted or measured, and given a numerical value. Qualitative data is descriptive in nature, expressed in terms of language rather than numerical values

Explanation:

:)

Please help with this question

Answers

A , wetlands act as a sponge sort of for water and slowly releases the water

Please help!!!!!!!!!!!!!!!!!!!!!!!!
Need help ASAP.

Answers

Based on the equation of the reaction and the limiting reactant of the reaction, molarities of the ions are determined from the amount in moles of excess reactants and soluble products formed.

What is the limiting reactant in the reaction?

The limiting reactant is he reavtant that is used up in the reaction after which the reaction stops.

The limiting reactant is obtained from the mole ratio of the reactants in the equation of the reaction.

Equation of reaction is given as follows:

3 AgNO3 (aq) + Na3P (aq) ----> Ag3P (s) + 3 NaNO3 (aq)

Molar mass of AgNO3 = 170 g/mol

Molar mass of Na3P = 100 g/mol

Molar mass of Ag3P = 355 g/mol

Molar mass of NaNO3 = 85 g/mol

Mass of AgNO3 reacting = 83.4 g

Moles of AgNO3 reacting = 83.4/170 = 0.49 moles

Mass of Na3P reacting = 62.9

Moles of Na3P reacting = 62.9/100 = 0.629 moles

Moles ratio of AgNO3 to Na3P = 3 : 1

Mole rational of AgNO3 and NaNO3 1 : 1

Based on the mole ratio;

AgNO3 is the limiting reactant while Na3P is in excessMoles of Na3P left over is 0.629 - (1/3 × 0.49) = 0.465 moles0.49 moles of NaNO3 are formed

At the end of the reaction, molarity of the ions are as follows:

Molarity of Na+ = {0.49 + (3 × 0.46)}/1.71

Molarity of Na+ = 1.094 M

Molarity of P^{3+} = 0.465/1.71

Molarity of P^{3+} = 0.272 M

Molarity of NO3^{-1} = 0.49/1.71

Molarity of NO3^{-1} = 0.286 M

Therefore, molarities of the ions are determined from the amount in moles of excess reactants and soluble products formed.

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During the course of a catalytic reaction the following occurs: 1) Substrate is covalently bound and oriented with proximity to the active site residues. 2) Negative charge builds up on the substrate and is stabilized. 3) Oxidation of the enzyme followed by reduction to complete the catalytic cycle. What type of chemical species can facilitate these reactions? A) nucleophilic amino acids B) electrophilic groups C) prosthetic phosphate groups D) transition metal anions E) transition metal cations

Answers

During the course of a catalytic reaction Substrate is covalently bound and oriented with proximity to the active site residues.

The type of chemical species which can facilitate these reactions is transition metal cations.

What is an Enzyme?

These are proteins that act as biological catalysts and accelerate chemical reactions.

They function by binding to the substrate and requires the use of transition metal cations which acts as cofactors.

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What mass of glucose can be produced from photosynthesis reaction using 10.0 mols co2

Answers

Answer:

300.06 grams of glucose can be produced from a photosynthesis reaction that occurs using 10 moles of carbon dioxide.

Explanation:

What portion of your salt solution in ice water system is: a. A mixture? b. A solution?

Answers

The salt and water are a homogeneous mixture but when salt dissolves in the water system is called a solution of salt and water.

What is a mixture?

A mixture is defined as the combination of two or more substances that are not chemically bonded together.

There are two types of mixture which include:

Homogeneous (uniform composition) and

Heterogeneous mixtures

When salt is added to the ice water system, it lowers the freezing point of the ice water thereby forming a homogenous mixture of water and salt.

The dissolution of salt in ice water leads to the formation of salt and water solution.

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how many liters of water would it require to 36 grams of the substance?

Answers

3 liters

________________

It would required 3 liters of substance

In the kinetic molecular theory of gas behavior, the assumption is made that gas molecules:.

Answers

Answer:

In the kinetic molecular theory of gas behavior; the assumption is made that gas molecules move with a kinetic energy equal to their centigrade temperature_ move rapidly in random directions: are close together in their container which exerts pressure_ are attracted to each other by strong forces.

Explanation:

A solution that has a high amount of hydrogen ions is called.

Answers

Answer:

a solution with high amount of hydrogen ions is called an acidic solution

Why might a company decide against using hydroelectric energy as an alternative energy resource?

Answers

Because gathering it leaves a negative impact on natural habitats.

0.05 moles of HCL are added to 2 L of H2O. What is the molarity of the solution?


Impossible to answer the question with the information provided.


1.60


0.025M


10.4

Answers

The molarity of the solution made by dissolving 0.05 mole of hydrogen chloride (HCl) in 2 L of water (H₂O) is 0.025 M

What is molarity?

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

How to determine the molarity Mole of HCl = 0.05 mole Volume = 2 L Molarity =?

Molarity = mole / Volume

Molarity = 0.05 / 2

Molarity = 0.025 M

Thus, the molarity of the solution is 0.025 M

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If 550 mL of a 3.50 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 275 mL, what will the molarity of the solution be?

Answers

Answer:

Explanation:

Molarity = number of moles / volume

If 550 mL of a 3.50 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 275 mL, which is half of 550 mL, the molarity of the solution with the same number of moles of KCl is 3.5 * 2 = 7.00 M

The molarity of the solution will be 7 M.

What is  molarity ?

The total count of moles of solute per liter of a particular solution is known as a solution's molarity.

What is solution?

The volume of just an object is a measurement of how much space it takes up.

Molarity of the solution can be determined by the formula:

[tex]M_{1} V_{1} = M_{2} V_{2}[/tex]

where, M = molarity of solution. V = volume.

Given data:

[tex]M_{1}[/tex] = 3.50 M

[tex]M_{2}[/tex] = ?

[tex]V_{1}[/tex] = 550 mL

[tex]V_{2}[/tex] = 275 mL

Now, put the value of given data in molarity equation.

[tex]V_{2} = M_{1} V_{1} /M_{2}\\V_{2} = (3.50 M) (550 mL) / (275 mL)\\V_{2} = 7 M[/tex]

Therefore, the molarity of the solution will be 7 M.

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Green gram defination
For grade 7

Answers

a leguminous plant, Phaseolus aureus, whose seeds are used as food in India.

Answer:

Green Gram is a small round edible green bean which is also known as moong ki daal in the subcontinent.

Explanation:

The green gram bean which is also known as the mung, maash or moong, is a plant species in the legume family. The green gram bean is mainly cultivated in East, Southeast and South Asia. It is used as an ingredient in both savoury and sweet dishes.

4. How many atom are in
C3H5(NO3)3

Answers

Answer:

carbon = 3

hydrogen=5

nitrogen=3

Oxygen=9

What are the solutions to problems caused by nitrogen gas in solution at certain depths?

Please Help!!!! 50 points

Answers

The solutions to problems caused by nitrogen gas in solution at certain depths is by discouraging deep diving.

What is Diving?

This involves moving around under water with the aid of special breathing equipment.

Limiting the depth of a dive should he encouraged as the maximum depth limit for a diver to use compressed air is 30 to 50 meters.

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Draw n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms

Answers

The structure of the compound n‑ethyl‑3‑methylpentanamide is attached to this answer.

What is IUPAC nomenclature?

The IUPAC nomenclature was given in order for us to be able to draw the structure of a compound from its name. This is the generally accepted means of naming compounds globally.

The structure of the compound n‑ethyl‑3‑methylpentanamide in which all the hydrogen attched are shown attached to this answer.

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The structure of n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms are attached. Its chemical formula is C₈H₁₇NO.

What is n‑ethyl‑3‑methylpentanamide?

N-ethyl-3-methylpentanamide has a five-carbon parent chain attached to an amide functional group in its structural formula.

An amide's N-atom also has an ethyl substituent. At the C-3 position of the parent chain, a methyl group is substituted.

Thus, the of n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms are attached. Its chemical formula is C₈H₁₇NO.

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