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Which of the following fibres is used for making parachutes?

A. Plastic

B. Terelyne

C. Nylon

D. Taylor swift ​

The mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.

The mass of an object can be calculated using the following formula:

F = ma

Where;

m = F/a

m = 356/4

m = 89kg

Therefore, the mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.

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Answer:

B

Explanation:

The two countries that have nearly 50% of global coal reserves are

United States and Russia

Option B is correct

Estimates of total world proved recoverable coal reserves as were around 1,156 billion short tons, with five countries accounting for roughly 75% of the world's proven coal reserves.

In conclusion, The USA coal reserves amounted to nearly 248.9 billion metric tons in 2020

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Answer:

Catabolic reactions

Explanation:

Anabolic reactions combine monosaccharides to form polysaccharides, fatty acids to form triglycerides, amino acids to form proteins, and nucleotides to form nucleic acids. These processes require energy in the form of ATP molecules generated by catabolic reactions.

Answer:650 mL

Explanation:

Remember that Molarity = mol/L. Rearranging the equation to solve for liters you get L = mol/Molarity.

80x10-3 mol / 12x10-2 M = 6.5x10-1 L

6.5x10-1 L (1x103) = 6.5x10 2 mL = 650mL

Answer:

hydrogen is the first in periodic table

Answer:

iron

Explanation:

has more magnetic metal

Between iron and copper metals, iron is more active than copper metal as it is present above Co in the electrochemical series.

Electrochemical series is a type of reactivity series in which metals are arranged from bottom to the top in the increasing order of their reactivity.

As we know that reactivity is directly proportional to the activity of any element. In the electrochemical series iron is situated at the top position as compared to the copper metal.

So, iron is more active.

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Answer:  The frying pan is made up of metals like aluminium or stainless steel as these metals are good conductor of heat.

Answer:

b. they are good conductors of heat

Explanation:

study island

The volume of NaOH required to titrate 50 mL of 0.0998 M butanoic acid to the equivalence point is 41.58 mL

C₄H₈O₂ + NaOH —> C₄H₇O₂Na + H₂O

From the balanced equation above,

From the question given above, the following data were obtained:

CaVa / CbVb = nA / nB

(0.0998 × 50) / (0.12 × Vb) = 1

4.99 / (0.12 × Vb)  = 1

Cross multiply

0.12 × Vb = 4.99

Divide both side by 0.12

Vb = 4.99 / 0.12

Vb = 41.58 mL

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Answer:

63.7

Explanation:

Percent yield is actual yield over theoretical yield. In this case, 10/15.7 = .637 = 63.7%.

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.

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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Answer:

118MOLS

Explanation:

M1VI=M2V2

THE REST WORK OUT ( BA UNZA STUDENTS HE HE HE )

We can store the copper sulphate solution in alumiun container, if cover on alumiun is present.

Aluminium is more reactive than copper so the Aluminium will displace copper sulphate from its solution by reacting with it but if there is cover on the aluminium then the alumium can't react with copper.

So we can store the copper sulphate solution in alumiun container.

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No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.

Different chemicals are put in different containers, usually glass, plastic, dark container, or light container.

Chemicals element are reactive to different substances and to each other.

That's why they are put in separate and different types of containers according to their reactivity.

Thus, No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.

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Answer:

b atoms

Explanation:

everything is made up of atoms

Answer:

AsF3:C2CI6

4:3

1.3618 moles: 1.02135 moles(1.3618÷4×3)

C2CI6 is the limting reagent

So the number of moles for AsCI3 is 0.817 moles( number of moles of the limting reagant) ÷3 ×4 (according to ratio by balancing chemical equation)=1.09 moles(3 s.f.)

or

Balanced equation

4AsF3 + 3C2Cl6 → 4AsCl3 + 3C2Cl2F4

Use stoichiometry to calculate the moles of AsCl3 that can be produced by each reactant.

Multiply the moles of each reactant by the mole ratio between it and AsCl3 in the balanced equation, so that the moles of the reactant cancel, leaving moles of AsCl3.

Explanation:

Answer:

hmm suspicious

lol I don't know bye

From the calculations performed, the Kb of the reaction is 9.9 * 10^-10

The term Kb refers to the base dissociation constant of a solution. We have the following information from the question;

pH of the solution = 8.60

concentration of p-toluidine =  0.016-M

Recall that  pOH = 14 - pH

pOH = 14 - 8.60 = 5.4

[OH] = Antilog (-5.4) = 3.98 * 10^-6 M

We have to set up the ICE table;

          CH3C6H4NH2(aq) + H2O(l) ⇄ CH3C6H4NH3^+(aq) + OH^-(aq)

I             0.016                                           0                                   0

C           -x                                                   +x                                  +x

E    0.016  - x                                            3.98 * 10^-6                3.98 * 10^-6

Hence;

Kb = [3.98 * 10^-6]^2/[0.016  - 3.98 * 10^-6]

Kb =  9.9 * 10^-10

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Given the data from the question, the astronauts do not have enough sodium hydroxide in the cabin to cleanse the cabin air of the carbon dioxide.

2NaOH + CO₂ —>Na₂CO₃ + H₂O

Molar mass of NaOH = 40 g/mol

Mass of NaOH from the balanced equation = 2 × 40 = 80 g

Molar mass of CO₂ = 44 g/mol

Mass of CO₂ from the balanced equation = 1 × 44 = 44 g

SUMMARY

From the balanced equation above,

44 g of CO₂ required 80 g of NaOH

From the balanced equation above,

44 g of CO₂ required 80 g of NaOH

Therefore,

3000 g of CO₂ will require = (3000 × 80) / 44 = 5454.55 g of NaOH

From the calculation made above, we can see that 5454.55 g of NaOH is needed by the astronaut to clean the cabin air but unfortunately, they only have 5000 g of NaOH.

Thus, we can conclude that the astronauts do not have enough NaOH to clean the air

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B is your answer

If the ignition temperature of a fuel is lower than the room temperature, then it can catch fire very easily.

Therefore for an ideal fuel, the ignition temperature should be higher than the room temperature.

let's observe one by one

#1

If ignition temperature is below room temperature the fuel can catch fire at once.

#2

Ignition temperature above room temperature is applicable as the fuel won't catch fire easily

#3

It's boiling point of water not fuels

#4

Equal to room temperature is same as first one can cause damage

The relationship between the volume, temperature, and pressure of the gas can be given by Charles law. The volume of the tire is 1.1 L.

According to Charles's law, the volume is directly proportional to the temperature of the gas at a constant pressure.

Charle's law can be shown as,

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

Given,

Initial volume = 1.0 L

Initial temperature = 295 K

Final volume = ?

Final temperature = 325 K

Substituting values in the above equation the final volume can be calculated as:

[tex]\begin{aligned}\rm V_{2} &= \rm \dfrac{V_{1}T_{2}}{T_{1}}\\\\&= \dfrac{ 1 \times 325}{295}\\\\&= 1.1\;\rm L\end{aligned}[/tex]

Therefore, the final resulting volume of the tire is 1.1 L.

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Answer:

Explanation:

Explanation:

which of the following is additive inverse of the following

Answer:

tap water Is the pure substance

Answer:

Ethanol is pure

Explanation:

Purity meaning homogenious molecules/atoms, steel is a mix of iron and carbon, tapwater has minerals in it + fluoride etc, petrol has oxane and ethanol in it. ethanol is only ethanol and is inherently pure

Aldol condensation involves  two aldehydes or two ketones or an aldehyde and a ketone. The product of the reaction is shown in the image attached.

Aldol condensation is a reaction that involves two aldehydes or two ketones or an aldehyde and a ketone. This reaction occurs at the carbonyl group as one of the carbonyl compounds is in the enolate form.

The product of the reaction is shown in the image attached. This gives the mechanism for the Aldol condensation of the compound 3‑methylbutanal.

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Hi there!

To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.

We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.

1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002

As the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.

Boyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.

Boyle's law is expressed as;

P₁V₁ = P₂V₂

Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.

Given the data in the question;

We substitute our given values into the expression above to find the final volume.

P₁V₁ = P₂V₂

[tex]V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{4.1atm \ *\ 5.0*10^{-6}L}{1.0atm}\\ \\V_2 = \frac{4.1 \ *\ 5.0*10^{-6}L}{1.0}\\\\V_2 = 2.05*10^{-6}L\\\\V_2 = 0.021mL[/tex]

Therefore, as the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.

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Answer:  [tex]3.45*10^{-7}[/tex]

Explanation:

we can use the equation Ka * Kb = Kw

Kw is the equilibrium constant and always equals to [tex]1*10^{-14}[/tex]

we plug the given numbers into the equation, [tex]Ka * (2.9*10^{-8} )=(1*10^{-14} )[/tex]

now we just solve for Ka, [tex]Ka=\frac{1*10^{-14} }{2.9*10^{-8} }[/tex]

which gives us the value, [tex]Ka=3.45*10^{-7}[/tex]

hope this helped! ♡

The ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.

Ka value is the equilibrium constant found by the dissociation of acid.

By the equation

[tex]\rm ka \times kb = kw[/tex]

where kb = [tex]2.9 \times 10^-^8[/tex]

kw = [tex]1 \times 10^-^4[/tex]

Now, putting the values in the equation

[tex]1 \times 10^-^1^4 = ka \times 2.9 \times 10^-^8\\\\ka = \dfrac{1 \times 10^-^1^4}{2.9 \times 10^-^8} \\\\ka = 3.45 \times 10^-^7[/tex]

Thus, the ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.

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Answer:

To determine whether a given single replacement will occur, you must use an “Activity Series” table. If the metal or the halogen is above the element it will replace based on the activity series, a single displacement reaction will occur. The video below summarizes an experiment conducted to compare the activities of three metals ( Mg, Cu and Zn ).

Explanation:

Single replacement reaction will occur if any more active specie will add on the solution.

Single displacement reactions are those reactions in which one element from the given molecule is displaced by some other element.

Generally displacement reactions are shown by metals when more reactive metal is added in the solution of any another metal. Then more reactive metal displaces the metal which is already present in the solution and reaction is taking place is shown by changing in color.

Hence single displacement reaction will occur when more reactive metal is added in any solution.

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The mass of oxygen must react to form 3.80 mol of Al₂O₃ in the given reaction is 182 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

4Al + 3O₂ → 2Al₂O₃

From the stoichiometry of the reaction it is clear that,

2 moles of Al₂O₃ = obtained from 3 moles of O₂

3.80 moles of Al₂O₃ = obtained from 3/2×3.80=5.7 moles of O₂

Now we calculate the mass of oxygen of 5.7 moles as:

W = (5.7mol)(32g/mol) = 182.4 grams or 182g

Hence option (4) is correct.

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Answer: 182 grams

Explanation: