A student decreases the temperature of a 417 cm³ balloon from 278 K to 231 K. Assuming constant pressure, what should the new volume of the balloon be?

376 cm³
417 cm³
462 cm³
924 cm³

Answer:

41.3 mL OF PENTANE CONTAINS 62.608 *10^-27 CARBON ATOMS.

Explanation:

Volume of Pentane = 41.3 mL

Density = 0.626 g/mL

Since density is defined as mass per unit volume. Calculate the mass:

Density = mass / volume

Mass = density * volume

Mass = 0.626 g/mL * 41.3 mL

Mass = 0.015 g of pentane

Molar mass of pentane C5H12 = ( 12* 5 + 1*12) = 60 + 12 = 72 g/mol

Number of moles = mass / molar mass

Number of moles = 0.015 g / 72 g/mol

Number of moles = 2.08 * 10^-4 moles.

Since 1 mole of pentane contains 5 moles of carbon, we can then calculate how many moles of csrbon 2.08*10^-4 moles will contain

1 mole of pentane = 5 moles of carbon

2.08 *10^-4 moles = x moles

x mole = 5 * 2.08*10^-4

x mole = 10.4 *10^-4 moles of carbon

In other words, 10.4*10^-4 moles of carbon is present in 41.3 mL of pentane

We can then calculate the number of carbon atoms present in the liquid using:

From 1 mole containing 6.02 *10^-23 atoms, 10.4 *10^-4 moles of pentane will contain:

1 mole = 6.02*10^-23 atoms

10.4 *10^-4 moles = (6.02*10^-23 * 10.4 *10^-4) atoms of pentane

= 62.608 *10 ^-27 atoms of pentane.

So therefore, 41.3 mL of pentane will contain 62.608 * 10 ^-27 carbon atoms

The number of C atoms in 41.3 mL of pentane (C₅H₁₂) of density 0.626 g/mL is 2.16x10²³.

To find the number of C atoms in pentane, we need to find the number of moles.

We can calculate the mass from the density:

[tex] d = \frac{m}{V} [/tex]

Where:

d: is the density = 0.626 g/mL

V: is the volume = 41.3 mL

The mass is:

[tex] m = d*V = 0.626 g/mL*41.3 mL = 25.85 g [/tex]

Now, with the molecular weight of the pentane, we can calculate the number of moles:

[tex] \eta = \frac{m}{M} = \frac{25.85 g}{72.15 g/mol} = 0.358 \:moles [/tex]

The number of C atoms can be found with Avogadro's number:

[tex] n_{C} = \frac{6.022\cdot 10^{23} \:atoms}{1\:mol}*0.358 \:moles = 2.16 \cdot 10^{23} \:atoms [/tex]

Therefore, the liquid contains 2.16x10²³ C atoms.

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Answer:

d)carbon(iv)oxide/carbon(ii)oxide

e)Calcium,carbon,oxygen

f)carnonhydride

g)Carbonhydrate

h)hydrogen+oxygen

I)Iron sulphide

j)Magnesiumoxide

m)magnesium hydroxide+hydrogen gas

d)carbon dioxide

Answer:

A. Invisible

Explanation:

Answer: Indivisible

Explanation: There was a brilliant philosopher named Democritus, and he proposed the Greek word atomos, which means uncuttable.

Synonyms for uncuttable are as follows:

Joined, inseparable, Indivisible, unbreakable, irreducible, impenetrable, unalterable, indissoluble, unified, permanent, immutable and unchangeable.

Why other answers are wrong:

I simply believe the other user may have had a minor typo which caused such confusion. Who knew one letter could effect an answer that much XD

Answer:

neon - non metal

Explanation:

Answer:

Answer:

Explanation:

Skeleton equations are also known as unbalanced equations.

Eg I react Oxygen, Hydrogen and Chlorine and I get Water and Chlorine Gas

H2 + Cl2 = HCl

Left Side

H = 2

Cl = 2

Right Side

H = 1

Cl = 1

As you can see it's not balanced is skeleton equation.

Answer:

Compounds formed from non-metals consist of molecules.

Explanation:

The atoms in a molecule are joined together by covalent bonds. These bonds form when atoms share pairs of electrons.

I hope I helped, please correct me if I'm wrong!

Considering the definition of covalent bond and molecules, compounds formed from only non-metals consist of particles called molecules.

But you have to know that the covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule.

Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas.

The shared electron pair is common to the two atoms and holds them together.

In other words, a covalent bond is a type of chemical bond where two atoms of non-metallic elements join to form a molecule, where the atoms share pairs of electrons from their most superficial layer or valence layer to achieve stability in the molecule and thus complying with the octet rule.

In summary, compounds formed from only non-metals consist of particles called molecules.

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Answer:

Central and South American forests.

Explanation: https://brainly.in/question/7540305

Answer: 1 mole of any gas has a volume of 22.4 L at STP

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 1 atm (at STP)

V = Volume of gas = ?

n = number of moles = 1

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]273K[/tex]  (at STP)

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{1mol\times 0.0820 L atm/K mol\times 273K}{1atm}=22.4L[/tex]

Thus 1 mole of every gas occupies 22.4 L at STP

Answer:

1 mole of any gas has a volume of 22.4 L at STP

Explanation:

ap3xx

Answer:

b

Explanation:

electrons lie in the orbits of the atom. they are negatively charged and they are very small in size. they have very less mass than proton. ele tron has 1/1840 mass of proton.

Answer:

Solar Energy & Wind Energy

Explanation:

These are renewable energy and can be used used in replacement for fossil fuels.

PLS MARK ME AS BRAINLIEST!!

Answer:

1.0456 g and 0.9811g

Explanation:

The measurements that are consistent with the approximate 1 g instruction would be 1.0456 g and 0.9811g.

Analytical balance generally weighs to an accuracy of 4 decimal places. Hence, every other option that is short of being in 4 decimal places is incorrect.

Also, 1.0456 g and 0.9811g when approximated to the nearest whole number give 1 g.

Answer:

Gravel >Sand>Silt>Clay

Explanation:

Sand, Clay, Gravel and Silt

Clay: all particles smaller than 0.002 mm

Silt: all particles within the size range of 0.002-0.05 mm;

Sand: all particles within the size range of  (2.0 mm - 0.05 mm)

Gravel particles are larger than sand, ranging in size from 4.75 mm to 75 mm

Going through the options, the correct option is;

Gravel >Sand>Silt>Clay

Answer:

A. 1:3

Explanation:

If we look at the ions shown in the image attached to the question, we will notice that we have aluminum (Al^3+), a trivalent ion combining with the iodide ion (I^-).

Aluminum can easily give out its three outermost electrons to three atoms of iodine. If aluminum gives out its three electrons, it achieves the stable octet structure. Iodine atoms have seven electrons in their outermost shell. They only need one more electrons to complete their octet. This one electron can be gotten by the combination of three iodine atoms with one atom of aluminum. One electron each is transferred from the aluminum atom to each iodine atom to form AlI3 with a ratio of 1:3.

Lewis dot structure is a diagrammatic representation of valence electrons in an atom of a molecule.

The ratio of the cations to anions in the given compound is 1:3.

In the given figure, Aluminum has 3 electrons, which can be donated to iodine. Aluminum has atomic number 13, this means that if the element donates three electrons then it will attain a stable electronic configuration.

In the Iodine atom, each iodine needs only one electron to complete its octet. Thus, three atoms of iodine will be required to gain electrons from aluminum.

Thus, the ratio cation to the anion is 1:3.

To know more about lewis dot structure, refer to the following link:

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Answer:

C. 3.05 x 10⁻¹⁹ J

Explanation:

Given;

wavelength of the light, λ = 652 nm = 652 x 10⁻⁹ m

speed of light, c = 3.00 x 10⁸ m/s

Planck's constant, h = 6.626 x 10⁻³⁴J·s

Energy of electromagnetic wave is calculated as;

E = hf

where;

f is frequency of the light wave

f = c / λ

[tex]E = hf = h\frac{c}{\lambda} \\\\E = \frac{hc}{\lambda} \\\\E = \frac{6.626*10^{-34}*3*10^8}{652*10^{-9}} \\\\E = 3.05*10^{-19} \ J[/tex]

Therefore, the energy of the light is 3.05 x 10⁻¹⁹ J

The correct option is "C"

C. 3.05 x 10⁻¹⁹ J

Answer:

Option C. 3.05 x 10¯¹⁹ J

Explanation:

Step 1:

Data obtained from the question.

wavelength (λ) 652 nm = 652x10^–9m

Velocity of light (v) = 3.00x10^8 m/s

Planck's constant (h) = 6.626x10^-34J·s

Step 2:

Determination of the frequency of the light.

The frequency can be obtained as follow

v = λf

3x10^8 = 652x10^–9 x f

Divide both side by 652x10^–9

f = 3x10^8 / 652x10^–9

f = 4.6x10^14s¯¹

Step 3:

Determination of the energy of the light wave.

This can be obtained as follow:

Planck's constant (h) = 6.626x10^-34J·s

Frequency (f) = 4.6x10^14s¯¹

Energy (E) =..?

E = hf

E = 6.626x10^-34 x 4.6x10^14s¯¹

E = 3.05 x 10¯¹⁹ J

Answer:

Oil---> Wood---> Water

Explanation:

Denser things always go on bottom. Since oil is on top is the least dense among those, and then comes wood and then finally water.

Answer:a

Explanation:

In the position A, the potential energy is maximum and the kinetic energy is  minimum. At the point B, kinetic energy is highest. At the point C, the losing kinetic energy, gaining potential energy and at D, losing potential energy, gaining kinetic energy.

Kinetic energy of moving body is the energy generated by virtue of its position. Potential energy is generated by virtue of its position at a height from the surface. When a body starts moving from rest, its potential energy starts convert to kinetic energy.

As the height increases,  potential energy increases. When an object moves down, its acceleration due to gravity increases and more energy to fall down make its kinetic energy higher.

Thus, the situations can be matched as follows;

A, the potential energy is maximum and the kinetic energy is  minimum. B, kinetic energy is highest.

C, the losing kinetic energy, gaining potential energy and

D, losing potential energy, gaining kinetic energy.

Find more on kinetic energy :

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Answer:

Percentage Mass carbon = 14.3%

Explanation:

Baking soda which is sodium hydrogen bicarbonate has the molecular fomula, NaHCO3.

Atomic masses of each of the component atoms is, Na = 23; H = 1; C = 12; O = 16

Step 1: Molar mass of NaHCO3 = 23 + 1 + 12 + 3*16 = 84 g/mol

Step 2: Percentage mass of Carbon = (atomic mass of Carbon / molar mass of NaHCO3) * 100%

= (12 / 84) *100%

Percentage Mass of carbon = 14.3%

Answer:

A source of electricity, a wire coil, and an iron core  

Explanation:

An electromagnet has three critical components:

1. A source of electricity

This is often a battery.

It generates the electric current that produces the magnetic field.  

2. A wire coil

The wire carries the electric current.

Stacking the wire into loops makes a stronger magnetic field.

The more loops in the coil, the stronger the field.

3. An iron core

An iron core greatly increases the strength of the magnetic field within it and at its ends.

Answer:

126 grams

Explanation:

What is the mass of two moles of HNO3?

H = 1g/mole = 1+

N = 14g/mole = 3-

O = 16g/mole = 2-

HNO3 = 63g/mole

Answer:

D

Explanation:

when ionic radius gets bigger, the valence electron is repelled further away from the nucleus due to higher number of principal quantum shells. it experiences less electrostatic forces of attraction with the nucleus and requires less energy to remove.