Consider the complete combustion of ethane (C2H4) in air. How many grams of O2 are required to completely react with 14 grams of C2H4? [Hints: begin with the balanced equation; and do the calculations of grams into moles to the nearest whole number.]

Answer:

a change in an atom's nunclues usually producing a different elements.

on the other hand, involved only a rearrangedment of electrons and do not involve change in the nuclie

Explanation:

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The initial temperature of the quartz sample is 18.4°C.

To calculate the initial temperature of the quartz sample, we can use the principle of heat transfer, which states that the heat gained by the water is equal to the heat lost by the quartz. The formula to calculate heat transfer is Q = mcΔT, where Q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

In this case, the heat gained by the water is given by Q_water = (300.0g)(4.18 J/g°C)(17.0°C - 15.0°C) = 1254 J, where 4.18 J/g°C is the specific heat capacity of water. Since the pressure remains constant, the heat lost by the quartz is equal to the heat gained by the water.

Using the formula Q_quartz = mcΔT, where m = 50.1g and c = 0.730 J/g°C, we can solve for ΔT. Plugging in the known values, we have 1254 J = (50.1g)(0.730 J/g°C)(ΔT). Solving for ΔT, we find that ΔT ≈ 43.2°C.

Since the initial temperature of the quartz sample is the temperature at which heat transfer occurred, we subtract ΔT from the final temperature of the water: 17.0°C - 43.2°C ≈ 18.4°C.

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The number of the hydrogen atoms that would be required from the diagram is 10.

A Saturated compound has all its carbon atoms connected by single bonds, and each carbon atom is bonded to the maximum number of hydrogen atoms possible. This arrangement allows the compound to have no available or unsaturated bonds for additional atoms.

The compound that is shown must be butane as such the number of the hydrogen atoms that it contains is a total of ten.

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Answer:

Fe2+ is greater in size than Fe3+. Consider the electronic configuration of Fe2+[Ar] 3d6 and Fe3+[Ar] 3d5 (For comparison, Fe [Ar] 4s2 3d6). Fe3+ ionic radius is 63 pm, while Fe2+ has an ionic radius of 77 pm. ... This is because the outermost electron in the Fe2+ ion is pulled off to form Fe3+ ion.

According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

Substitute the given parameters into the formula;

Therefore the volume of the gas at 20°C is approximately 97.67cm³

Answer:

Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid. Because carbon dioxide is released at a faster rate through the acid-base reaction than through fermentation.

Baking powder is a mixture because it contains both sodium hydrogen phosphate and potassium hydrogen tartrate (two different compounds.)

Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9. The basicity constant, or Kb, is a measure of the strength of a base in a particular chemical reaction. The products of a reaction of a weak base and water with the corresponding acid determine the base constant.

For example, for a given acid and base, Kb1 and Kb2 are the basicity constants for the first and second base dissociations, respectively, of the base. The formulas and charges of the conjugate acid and base, as well as the acid dissociation constants, Ka1 and Ka2, are needed to calculate Kb1 and Kb2.

The following reactions are balanced chemical reactions that represent the dissociation of succinic acid:

Reaction 1: H2C4H4O4(aq) + H2O(l) ⇌ HC4H4O4(aq) + H3O+(aq) Ka1 = 6.2 × 10−5
Reaction 2: HC4H4O4(aq) + H2O(l) ⇌ C4H4O42-(aq) + H3O+(aq) Ka2 = 2.3 × 10−6

The values of Ka1 and Ka2 can be used to calculate Kb1 and Kb2, respectively, using the following equation:

Ka1 × Kb1 = Kw

where Kw is the ion-product constant for water, which is 1.0 × 10−14 at 25°C.

Kb1 can be calculated as follows:

Kw = Ka1 × Kb1

Kb1 = Kw / Ka1

Kw = 1.0 × 10^-14

Ka1 = 6.2 × 10^-5

Kb1 = Kw / Ka1

Kb1 = 1.0 × 10^-14 / 6.2 × 10^-5

Kb1 = 1.61 × 10^-10

Kb2 can be calculated using the same method:

Kw = Ka2 × Kb2

Kb2 = Kw / Ka2

Kw = 1.0 × 10^-14

Ka2 = 2.3 × 10^-6

Kb2 = Kw / Ka2

Kb2 = 1.0 × 10^-14 / 2.3 × 10^-6

Kb2 = 4.35 × 10^-9

Therefore, Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9.

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Answer:

\(12 \: litres \: contain \: 3 \: \: moles \: of \: sodium \: chloride \\ 1 \: litre \: will \: contain \: \frac{(1 \times 3)}{12} moles \\ = 0.25 \: mol \: {l}^{ - 1} \)

Explanation:

\(12 \: litres \: contain \: 3 \: \: moles \: of \: sodium \: chloride \\ 1 \: litre \: will \: contain \: \frac{(1 \times 3)}{12} moles \\ = 0.25 \: mol \: {l}^{ - 1} \\ or : 0.25 \: M\)

Answer:

Copper, Lead, Gold, Silver, Iron, Carbon, Tin, Sulfur, Mercury, Zinc, Arsenic, Bismuth, Phosphorus, Cobalt, Platinum, Nickel, Magnesium, Hydrogen, Oxygen,  Nitrogen, Barium, Chlorine,  Manganese, Molybdenum, Tungsten.

Explanation:

Hope This Helps :b

Answer:

Vanadium

V

Chromium

Cr

Manganese

Mn

Aluminum

Al

Silicon

Si

Phosphorus

P

Sulfur

S

Chlorine

Cl

Argon

Ar

Potassium

K

Calcium

Ca

Scandium

Sc

Titanium

Ti

Lithium

Li

Beryllium

Be

Boron

B

Carbon

C

Nitrogen

N

Oxygen

O

Fluorine

F

Neon

Ne

Sodium

Na

Magnesium

Mg

Magnesium

First shell has 2

Second has 8

Third has 2

the second one is space while the first one is shape

1= Shape

2= Space

plz vote brainleist

Answer: zinc is less reactive than chlorine and therefore will not displace it.

Explanation: as we see in the reactivity series, chlorine is more reactive than potassium. a less reactive element will not displace (take the place of) a more reactive element. no reaction will occur.

If you purchase two new tires instead of four, you should put them on the rear means back side.

If you are here for a short answer on where the two new tires should be installed, always place the new tires on the rear when buying two tires instead of four. This is because more weight of car comes on the back tires so the new tires should be installed on the back tires of the car.

So we can conclude that If you purchase two new tires instead of four, you should put them on the rear means back side.

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The chlorine atoms can be held together by the dispersion forces.

We know that the chlorine atoms are the atoms that we could say that they have an electronegativity value that is almost the same. As such we can see that the the compound is non polar.

Given the fact that the compound is non polar, the atoms would be held together by a kind of bond that not polar in nature and these are the dispersion forces that hold the non polar molecules together.

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Answer:

Two cinder blocks 6 centimeters apart

Explanation:

im not 100% certain but the 2 cinder blocks are more dense than the other options

sry if its wrong

Answer:

decreasing pressure will shift the reaction toward the reactants

Answer:

1. Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages). ...

2. Convert the mass of each element to moles. ...

3. Find the ratio of the moles of each element. ..

4. Use the mole ratio to write the empirical fomula

Answer:

Multiply each result by the given mass.

Explanation:

Hi!

In order to find percent/mass composition you would

1. write the formula

2. calculate the molar mass for each equation

3. add all the masses to get the compound molar mass

4. divide each molar mass by the total mass

and then for mass composition, you would multiple eachy result by the given mass.

For example;

Calculate the number of grams of gold in 89.6 grams of gold(1) perchlorate.

Your formula would be AuClo4

Au : 196.96 x 1

Cl: 35.4 x 1

O: 16 x 4

Add the masses together to get 296.5 g/mol

Lets say we're looking for Oxygen. You would take what you got (16 x 4) and divide it by the total mass. 64/296.5

This would equal 0.215. Instead of multiplying this by 100 like you would for percent, for mass you would multiply by what is given. in this instance it is 89.6.

0.215 x 89.6 = 19

But the question is asking for gold,

197/296

= 0.664 x 89.6

= 59.5

Your answer would be 59.5 grams Au

Hope this helped! : D

Answer:

2

Explanation:

Pb(NO3)2 + 2NaI 2NaNO3 + PbI2

To see the coefficients of NaI in the given reaction we need to balance the reaction first. The coefficient for Nal once the equation is balanced is 2. the correct option is option B.

Balanced equation is the one where the number of atoms of each species is same on reactant and product side. In balanced equation mass can neither be created nor be destroyed.

The unbalanced equation is

\(\rm Pb(NO_{3})_{2}+ Nal\rightarrow NaNO_{3} + PbI_{2}\)

The atoms of Pb on reactant and product side is 1 so Pb is balanced.

The atoms of N is 2 on reactant and 1 on product side so balance it as

\(\rm Pb(NO_{3})_{2}+ Nal\rightarrow 2 NaNO_{3} + PbI_{2}\)

The atoms of O is 6 on reactant and 6 on product side so it is balanced

The atoms of I is 1 on reactant and 2 on product side so balance it as

\(\rm Pb(NO_{3})_{2}+2 Nal\rightarrow 2NaNO_{3} + PbI_{2}\)

The atoms of Na on reactant and product side is 2 so Na is balanced.

Now all the elements are balanced

Therefore, the coefficient for Nal once the equation is balanced is 2. the correct option is option B.

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Answer:

a) 0,5

Explanation:

If x=6 and y=2, then (2x-4y)/(x+y)=(2*6-4*2)/(6+2)=(12-8)/8=4/8= 0,5

Answer:

C

Explanation:

Answer:

The awnser is C: it tells you how much of a molecule IS up of each element.

Answer:

i fi am not wrong the correct answer is  D

Explanation:

Answer:

The answer is D

Explanation:

More height= more potential energy

A student is conducting a laboratory experiment with sulfur hexafluoride with a molar mass of 146.07 g/mole. The completed chart would be: Compound | SF6, Mass | 235.7 g, Moles | 1.61 moles, Particles | 9.72 x 10²³ particles.

To calculate the number of moles and the number of particles, we need to use the following formulas:

1 mole = mass (g) / molar mass (g/mole)

Number of particles (Avogadro's number) = number of moles x 6.022 x 10²³  particles/mole

Given the mass of SF6 as 235.7 g, we can calculate the number of moles as follows:

number of moles = mass (g) / molar mass (g/mole) = 1.61 moles

And then, we can calculate the number of particles as follows:

number of particles = number of moles x 6.022 x 10²³  particles/mole = 1.61 moles x 6.022 x 10²³  particles/mole = 9.72 x 10²³  particles

Therefore, the completed chart would be:

Compound | SF6

Mass | 235.7 g

Moles | 1.61 moles

Particles | 9.72 x 10²³  particles

A mole is the unit of measurement used in chemistry to express amounts of a chemical substance. One mole is defined as the amount of a substance that contains Avogadro's number of units, where Avogadro's number is defined as 6.02214076 x 10²³ particles per mole. This number of particles can be atoms, molecules, ions, or electrons, depending on the substance.

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The correct option is:D. CH2BrCH2Br.  The product that results from the reaction of CH2=CH2 (ethylene) with Br2 (bromine) is CH2BrCH2Br (1,2-dibromoethane). The reaction of CH2==CH2 with Br2 is a halogenation reaction, which involves the addition of a halogen to an unsaturated organic compound.

The product that results from this reaction is CH2BrCH2Br, which is option D. This product is formed by the addition of one Br atom to each of the carbon atoms in the double bond of ethene. The resulting molecule is a dibromoalkane, which is a type of organic compound that contains two bromine atoms attached to adjacent carbon atoms. This reaction is an example of an addition reaction, where the unsaturated organic compound undergoes a reaction with a halogen to form a saturated organic compound. In summary, the correct answer is D, CH2BrCH2Br. This reaction is an example of an addition reaction, in which the bromine atoms are added to the carbon atoms in the double bond, resulting in a single bond between the carbon atoms and a bromine atom attached to each carbon.

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Answer:

D.Cell wall

Explanation:

Cell wall is a distinct feature that is mainly seen in plant cells (mostly made of Cellulose) or in prokaryotic cells like bacteria.

hope this helps you :)

Answer:

Leucippus and Democritus

Explanation:

Hope this helps~ :D

Thank you so much! :D