A chemist heated a sample of steel wool in a burner flame exposed to oxygen in the air. He also heated a sample of steel wool in a container of nearly 100% oxygen. The steel wool sample in the container reacted faster than the other sample. a.Explain why.

Answers

Answer 1

Answer:

Explanation:

Explanation

Look at the equation that describes what is going on.

4Fe(s)+3O2(g)⟶2Fe2O3

Air is about 20% oxygen. The flame of steel wool is a gentle one since the oxygen is in limited supply.

Steel wool is about 99 % Iron. The rection above tells you that when steel wool ignites, it becomes Fe+3

Answer: The rule is the more oxygen you have, the more violent the burning process.


Related Questions

A/an _______ is the smallest unit of matter that has the characteristics of a chemical element. Question 9 options: A) proton B) atom C) molecule D) electron

Answers

Answer: atom

Explanation: molecule is a group or two or more atoms

protons and electron are subatomic particles

atom is the smallest unit of matter

balance following equation
H2 + _02 → _H20

Answers

Answer:

2H2+O2=2H20

Explanation: Since there are 2 Oxygen in the reactants then there must be 2 Oxygen in the products, meaning there is a coefficient of 2 in front of H20 and that makes there be 4 Hydrogen, so adjust the reactants (2 H2)

for now pliss help me ​

Answers

In the nucleus of the cell I think

Answer:

the nucleoid

Explanation:

How can you tell if a substance is an acid or base?

Answers

Answer:

To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrogen ions

What will occur when the trough of Wave A overlaps the crest of Wave B?

Destructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
Constructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
Destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
Constructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.

Answers

Answer:

Destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.

Explanation:

Destructive interference has lesser intensity.

When the trough of Wave A overlaps the crest of Wave B, destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B. Therefore, option C is correct.

What is interference and its types?

Interference is the phenomenon that occurs when two or more waves meet and overlap with each other.

There are two types of interference: constructive interference and destructive interference.

Constructive Interference: This occurs when the crest of one wave overlaps with the crest of another wave or the trough of one wave overlaps with the trough of another wave. Destructive Interference: This occurs when the crest of one wave overlaps with the trough of another wave. The resulting wave has a lower intensity, which corresponds to a decrease in energy.

Therefore, option C is correct.

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elect the correct answer. What is the formula of sulfurous acid? A. H2S B. HSO4 C. H2SO4 D. H2SO3

Answers

H2SO3 is the correct answer. I understand school is hard, but WORK HARDER!

CH4(g) + 2O2 (g) →CO2(g) + 2H2O (l), ΔH = -890kj/mol
Calculate much heat is released when 3.5 moles of methane gas undergo a combustion reaction

Answers

A combustion reaction is a reaction that reacts with oxygen to produce the product. 3.5 moles of methane release - 3115 kJ/mol of heat.  

What is a combustion reaction?

A combustion reaction is a chemical reaction that involves the burning of the reactant in the presence of the oxygen molecule to release heat.

The balanced reaction of methane combustion is given as:

CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol

From the reaction, it can be said that 1 mole of methane combusts to produce -890kJ/mol enthalpy.

So, 3.5 moles will produce, 3.5 × -890kJ/mol = - 3115 kJ/mol.

Therefore, 3.5 moles of methane produce - 3115 kJ/mol heat.

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What substance(s) do you predict will be able to diffuse through the cell membrane and why?

Answers

Consider substances that can easily diffuse through the lipid bilayer of the cell membrane, such as the gases oxygen (O2) and carbon dioxide (CO2). These small, fat soluble gasses and other small lipid soluble molecules can dissolve in the membrane and enter or exit the cell following their concentration gradient.

1 Identify Draw an example of a force acting on an object.

Answers

Answer:

Answer below

Explanation:

Just draw a photo of someone pushing an object across a table. Your push is the force acting on the object you're pushing.

Complete the sentence using the word refracting, radlo, or space.
Telescopes that use lenses to bend light are called
telescopes.

Answers

Answer:

Refracting

Explanation:

Mark the word bend lightHence light travels through one medium to another it bends down which is called refraction.The bendness depends upon the refractive index of medium.

A 500.0 ml. Glass filled with air is placed into water up-side-down while at 7.0°C. The water is heated to 77°C. How much air bubbles out from under the glass?

Answers

The answer is 125 ml air bubbles come out from under the glass

What is Charle's Law ?

Charles's Law describes the directly proportional relationship between the volume and temperature (in Kelvin) of a fixed amount of gas, when the pressure is held constant.

V∝T

or express from two volume/temperature points:

[tex]\rm\dfrac{V_{1}}{T_{1}} =\dfrac{V_{2}}{T_{2}}[/tex]

This equation can be used to solve for initial or final value of volume or temperature

under the given condition that pressure and the number of mole of the gas stay the same.

It is given that

V₁ = 500 ml  

T₁= 7 + 273 = 280 K

T₂ = 77+273 = 350 K

​V₂= ?

Substituting the values in the above in the above equation

[tex]\rm\dfrac{500}{280}} =\dfrac{V_{2}}{350}[/tex]

​V₂ =  625 ML

The volume of the glass is still 500 ml,

so, the volume of bubbles is 125 ml.

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How do I learn a subject easier

Answers

Say out loud what you want to remember.

Take notes by hand, not on a computer.

Chunk your study sessions.

Test yourself. A lot.

Change the way you practice.

Exercise regularly.

Get more sleep.

Learn several subjects in succession.

So if u want to learn a subject easily then what u recommend u do is get someone to talk to you, revise (I’m bad at it tho) don’t over work urself. Take some notes of the subject ur wanting to learn . Don’t take ages learning that or you’ll fall behind on all the other subjects so yh

) experimental evidence indicates that the nucleus of an atom

a) contains most of the mass of the atom
b) contains a small percentage of the mass of the atom
c) has no charge
d) has a negative charge

Answers

d) This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

When a chemical cold pack is activated, it becomes cool to the touch. What is happening in terms of energy?.

Answers

Answer:

An exothermic reaction is happening, it is absorbing the cold.

Type the correct answer in the box. given: cac2 n2 → cacn2 c in this chemical reaction, how many grams of n2 must be consumed to produce 265 grams of cacn2? express your answer to three significant figures. the reaction requires grams of n2.

Answers

The amount, in grams, of [tex]N_2[/tex] that will be consumed to produce 265 grams of [tex]CaCN_2[/tex] will be 80.61 grams

Stoichiometric calculation

From the equation of the reaction:

[tex]CaC_2 + N_2 --- > CaCN_2 + C[/tex]

The mole ratio of  [tex]N_2[/tex] consumed to   [tex]CaCN_2[/tex] produced is 1:1.

Mole of 265 grams of  [tex]CaCN_2[/tex] = 265/92.11 = 2.88 moles

Equivalent moles of  [tex]N_2[/tex] = 2.88 moles

Mass of 2.88 moles  [tex]N_2[/tex] = 2.88 x 28.02 = 80.61 grams

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how do energy sources poly a role in the rock formation?

Answers

Sun (radiation), winds (eolic) and water (hydraulic) are all sources of energy that work together during rock formation.

What is rock formation?

The rock formation is a very slow process that occurs at a geological time, which may take millions of years.

During this period, rocks are shaped by different types of energy, especially radiation and erosion (wind and water bodies)

In conclusion, the sun (radiation), winds (eolic) and water (hydraulic) work together during rock formation.

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Identify the acid, base, conjugate acid, and conjugate base in the following reaction:
HSO4- + NH3 = SO4-2 + NH4+

Answers

Answer:

Acid: HSO4-

Base: NH3

Conjugate Acid: NH4+

Conjugate Base: SO4-2

Explanation:

HSO4- gives a H+ to NH3 making NH4+ the conjugate acid.

Same can be said to the base.

What is a major problem with CFCs?

It is a greenhouse gas.

It does not readily break down in the atmosphere.

It isn't a good refrigerant.

It is toxic to breathe.

Answers

The major problem with CFCs is that It is a greenhouse gas, Option A is correct.

What are CFC's ?

Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.

They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants.

CFCs are classified as halocarbons, a class of compounds that contain atoms of carbon and halogen atoms

The major problem with CFC's is that they are green house gases

It destroys ozone in the upper atmosphere (stratosphere).

CFCs can produce more than 10,000 times as much warming, pound for pound, once they are in the air.

It is not  only because of their dramatic warming potential  but also  

They were found to be the primary cause of the rapidly escalating destruction of the Earth’s ozone layer,

which protects the planet from dangerous, cancer-causing levels of ultraviolet radiation.

Therefore The major problem with CFCs is that It is a greenhouse gas, Option A is correct.

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Which is a non renewable resource A.oil b.sunlight c. Water d.wood

Answers

Answer:

(a) Oil

Explanation:

Oil is a renewable source, along with natural gas, coal, and nuclear energy.

lmk is this helped you

~rere

Answer:

A. Oil

Explanation:

Oil, along with natural gas, and coal are called fossil fuels and fossil fuels were formed within the Earth from dead plants and animals millions of years ago.

17. Explain the relationship between atmospheric pressure and the actual boiling point of a liquid.

Answers

Answer:

The lower the atmospheric pressure, the lower the boiling point will be. The greater the pressure, the more energy required for liquids to boil, and the higher the boiling point.

what is the mass in grams for 7.14x10^3 mol of PCI3?

Answers

Answer:

980,536.2 grams

Explanation:

The mass of a compound is equal to its moles times its molar mass.

The molar mass of PCl3 is 137.33 g/mol

137.33 x 7.14 x 10^3 = 980,536.2

what is the molar mass of H,S

Answers

Answer:

the answer to your question is 1.00784 u

molar mass of H₂S

= 2.Ar H + 1.Ar S

= 2. 1,00784 u + 1. 32,065 u

= 34.08068 u

Continued deforestation will most likely lead to _______. a. a decrease in the number of endangered species b. an increase in the number of endangered species c. an increase in the number of oil and chemical spills d. a decrease in glacial melting please select the best answer from the choices provided a b c d

Answers

Deforestation often leads to an increase in the number of endangered species of plants and or animals.

What is deforestation?

Deforestation refers to the conversion of forests to non-forest uses. In other words, it is the removal of forest layers for non-forest reasons.

Since forests represent a hotspot for plant and animal biodiversity, their removal automatically means a decrease in biodiversity.

Endangered species are species of plants and animals that are under the threat of going extinct either due to natural or anthropological effects.

Thus, deforestation often leads to an increase in the number of endangered species.

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Answer:

b

Explanation:

what is the answer to this question? i do not know what the names are

Answers

answer : ethene

ethene is C2H4

The answer is Ethene.

Produced by heating natural gas.

what are advantage of using alternatives to fossil fuels?

Answers

Answer:

Fossil fuels release greenhouse gases and are non renewable

All stoichiometry calculations involve what important step?
metric fraction
molar mass fraction
molecules fraction
mole ratio fraction
DONE

Answers

Answer:

Mole Ratio Fraction

Explanation:

That's the answer.......

Answer:

D

Explanation:

Mole Ratio Fraction

How many grams of sodium hydroxide, NaOH, are needed to make 355.0 mL of a 4.75M solution? The molar mass of NaOH is 40.00 g/mol

Answers

Answer:

4198.97404999

Explanation:

In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.

If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.

Justify how dstv has been regarded as an example of a monopoly with the nature of product

Answers

When natural conditions are present in a free market then, the natural monopoly arises. Dstv is unique and has no other substituents that make them an example of monopoly.

What is a monopoly?

Monopoly is the dominance of a single product, goods, service, business, etc. in the market or the economic sector that excludes the other competitors. They can be the single seller that sells in the business.

DStv is a monopoly in America and includes natural gases, electricity, and communication services. It has no other competitor in the market and has control over others. They are the sole service provider and have no close substitutes.

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Please Hurry And Answer This Question! :)

Which Compound can be used to preserve biological specimens?

1/2/3?

Answers

Biological specimens are the preserved remains of the biological materials. Compound A. formaldehyde or formalin is used to preserve the specimens. Thus, option A is correct.

What are fluid-preserved specimens?

Fluid preserved specimens are the biological material of the organism that are kept at the store to study and analyze over a long time without getting any damage. Formaldehyde along with alcohol is the most common preservative.

Formaldehyde is an organic compound that is colorless and pungent in the smell that preserves the dead remains of the organisms intact. It is antiseptic and germicide in nature that makes them best for the purpose.

Therefore, option A. formaldehyde is used to preserve the specimens.

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Answer:

so i put a...

Explanation:

Edge doesnt give correct answers on unit tests, but i passed with an 88 :)

Correct me if im wrong!!

compare fission and fusions.

Answers

Both Fission and Fusion both have to do with the nuclei. Also, Both fission and fusion are nuclear reactions that produce energy.
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