What is the volume of pure sulfur if its mass is a 130 g and the density is 2.07 g/mL

De-Broglie wavelength λ for wave association with object of mass m moving with velocity v is given by-

\(\boxed{\sf{\lambda = \frac{h}{mv}}}\)

Here, h = Planck constant( value ≈ 6.63 ×10-³⁴ joules second )

Putting Values -

λ = 6.63×10-³⁴/100×0.1

=>6.63×10-³⁴/10

=>6.63 × 10-³⁵ m

Thus, option (a) is correct.

Answer:

erwin discovered how to accurately calculate the energy levels of electrons in atoms

Explanation:

hope this helps.

In 1926, Erwin Schrödinger expressed a wave equation that explicitly determined the energy levels of electrons in atoms. All the time Erwin Schrödinger was alive, he persisted in his study and published various articles on a diversity of topics, including the difficulty of joining gravitation and electromagnetism.

Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

The solution has a molarity of 0.0924 M.

The number of moles of solute per litre of solution is known as molarity.. For instance, water is both the solution and the solute when table salt is dissolved in it. Each mole of sodium chloride weighs 58.44 grammes. 58.44 grammes of sodium chloride are dissolved in one litre of water to produce one molar solution, or 1M.

Moles of solute per litre of solution is known as molarity (M).

Given: moles of NH3 = 0.355, volume of solution = 3.84 L

Molarity = 0.355 moles / 3.84 L = 0.0924 M

Therefore, the molarity of the solution is 0.0924 M.

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The number of molecules in 1 drop of the water is 1.67×10²¹ molecules

We'll begin by calculating the mass of the water. This can be obtained as follow:

•Volume = 50 μL = 50×10¯⁶ L = 50×10¯⁶ × 10³ = 0.05 mL

•Density = 1 g/mL

•Mass =?

Mass = Density × Volume

Mass of water = 1 × 0.05

Mass of water = 0.05 g

1 mole of water = 6.02×10²³ molecules

1 mole of water = 18 g

Thus,

18 g of water = 6.02×10²³ molecules

Therefore,

0.05 g of water = (0.05 × 6.02×10²³) / 18

0.05 g of water = 1.67×10²¹ molecules

Thus, the number of molecules in 1 drop of the water is 1.67×10²¹ molecules

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The mass (in grams) of H₂O produced from the reaction is 2520 grams

We'll begin by writing the balance equation for the reaction. This is given below:

CH₄(g) + 2O₂(g) -------> CO₂(g) + 2H₂O(g)

From the balanced equation above,

1 mole of CH₄ reacted to produce 2 moles of H₂O

Therefore,

70 moles of CH₄ will react to produce = 70 × 2 = 140 moles of H₂O

Finally, we shall determine the mass of water, H₂O produced from the reaction as follow:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of water, H₂O = 140 × 18

Mass of water, H₂O = 2520 grams

Thus, 2520 grams of water, H₂O were obtained from the reaction

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The sun sending out electromagnetic waves is best describes the source of radiation heat.

Radiation heat is the form of electromagnetic waves.

Radiation heat, commonly referred to as thermal radiation, is the electromagnetic radiation that defines how photons exchange heat. The technique of heat transfer known as radiant heat does not require a medium to be propagated in.

Two molecules colliding with each other produce kinetic energy, moving objects have kinetic energy. Radiation heat is thermal energy. Sun directly sends thermal radiation through electromagnetic waves.

Hence , The sun sends out electromagnetic waves directly is best describes the source of radiation heat.

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Answer:

10 g The change from ice to water is a phase change for the water. A phase change does not change the mass of the water. So if you end up with 10 g of water, and you originally started with ice, then that means you had to start with 10 g of ice. Therefore the best estimate of the mass of the ice cube is 10 g.

Explanation:

Answer: C is the correct answer

Answer:

C. i don't kow

Explanation:

The statement about cells and genes that is false is a) the sequencing of bases within a gene is of little significance.

The sequence of bases is of major significance in an individual and hence option a is false. The sequences of bases in a gene help in the formation of specified proteins that carry out the functioning in an individual. The sequencing of the bases is also important as any change in the bases can cause the wrong proteins to be formed which might cause the ultimate death of an individual if a major kind of protein is not produced.

The sequence of bases also determines if there are chances of any disorder to occur in an individual due to the pattern of bases being changed.

The question will correctly be written as:

Which of the following statements about cells and genes is false? multiple choice

a) the sequencing of bases within a gene is of little significance.

b) each chromosome contains hundreds to thousands of genes.

c) each cell contains 23 pairs of chromosomes.

d) our bodies are made up of about 260 different types of cells.

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The question is incomplete, the complete reaction equation is;

The concentration of a hydrogen peroxide solution can be determined by titration

with acidified potassium manganate(VII) solution. In this reaction the hydrogen

peroxide is oxidised to oxygen gas.

A 5.00 cm3 sample of the hydrogen peroxide solution was added to a volumetric flask

and made up to 250 cm3 of aqueous solution. A 25.0 cm3 sample of this diluted

solution was acidified and reacted completely with 24.35 cm3 of 0.0187 mol dm–3

potassium manganate(VII) solution.

Write an equation for the reaction between acidified potassium manganate(VII)

solution and hydrogen peroxide.

Use this equation and the results given to calculate a value for the concentration,

in mol dm–3, of the original hydrogen peroxide solution.

(If you have been unable to write an equation for this reaction you may assume that

3 mol of KMnO4 react with 7 mol of H2O2. This is not the correct reacting ratio.)

Answer:

2.275 M

Explanation:

The equation of the reaction is;

2 MnO4^-(aq) + 16 H^+(aq) + 5H2O2(aq) -------> 2Mn^+(aq) + 10H^+ (aq) + 8H2O(l)

Let;

CA= concentration of MnO4^- =  0.0187 mol dm–3

CB = concentration of H2O2 = ?

VA = volume of MnO4^- = 24.35 cm3

VB = volume of H2O2 = 25.0 cm3

NA = number of moles of  MnO4^- = 2

NB = number of moles of H2O2 = 5

From;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CB = CAVANB/VBNA

CB = 0.0187 * 24.35 * 5/25.0 * 2

CB = 0.0455 M

Since  

C1V1 = C2V2

C1 = initial concentration of H2O2 solution = ?

V1 = initial volume of H2O2 solution =  5.0 cm3

C2 = final concentration of H2O2 solution= 0.0455 M

V2 = final volume of H2O2 solution = 250 cm3

C1 = C2V2/V1

C1 = 0.0455 * 250/5

C1 = 2.275 M

Answer:

A. 5H²O=23

B.ZnCL²=135

The specific heat capacity of the zinc metal, given that 2.40×10¹ g of zinc metal at 2.10×10¹ °C is added to the water is 0.27 J/gºC

First, we shall obtain the heat absorbed by the water when the zinc metal was added. This is shown below:

Q = MCΔT

= 5.60×10¹ × 4.184 × -2.1

= -492.0384 J

Now, we shall determine the specific heat capacity of the zinc metal. Details below:

Q = MCΔT

492.0384 = 2.40×10¹ × C × 76

492.0384 = 1824 × C

Divide both sides by 1824

C = 492.0384 / 1824

= 0.27 J/gºC

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Answer:

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An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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Answer:

mg

Explanation:

there are 2.05 moles mg and 2.05 moles hcl

MM Mg = 24 g/mol

MM HCl = 36.5 g/mol

mol Mg = 50 : 24 = 2.083

mol HCl = 75 : 36.5 = 2.055

moles of reaction: divide the moles of each reactant by its corresponding coefficient in the balanced equation.

Mg : HCl = 2.083/1 : 2.055/2 = 2.083 : 1.028

HCl is the limiting reactant because it gives the fewest moles of reaction.

Given the nuclear reaction above, the following applies;

Nuclear reaction is a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

The reaction products may contain a different element or a different isotope of the same element.

Alpha decay is a radioactive decay by emitting an alpha particle, which is a positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons).

Based on the above explanation, the above-mentioned applies when radium atom undergoes alpha decay.

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Answer:

Explanation:0.089mol

at STP 22.4l of any ideal gas is the volume of one mole which means the number of moles in 02 is222.4=0.089.

Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as hematite contain iron(III) oxide, Fe2O3. The oxygen must be removed from the iron(III) oxide in order to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.

Carbon is more reactive than iron, so it can displace iron from iron(III) oxide. Here are the equations for the reaction.

Step 1 – Hot air (oxygen) reacts with the coke (carbon) to produce carbon dioxide and heat energy to heat up the furnace.

C(s) + O2(g) → CO2(g)

Step 2 – More coke is added to the furnace and reduces the carbon dioxide into carbon monoxide, a good reducing agent.

CO2(g) + C(s) → 2CO(g)

Step 3 – iron(III) oxide is reduced.

iron(III) oxide + carbon → iron + carbon dioxide

2Fe2O3(s) + 3C(s) → 4Fe(l) + 3CO2(g)

In this reaction, the iron(III) oxide is reduced to iron, and the carbon is oxidized to carbon dioxide.

In the blast furnace, it is so hot that carbon monoxide can be used, in place of carbon, to reduce the iron(III) oxide:

iron(III) oxide + carbon monoxide → iron + carbon dioxide

Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

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