element compound mixture​

Answer:

See explanation

Explanation:

When introduced to hot water, sodium and potassium metals react violently to form a colourless solution and hydrogen gas. The metal becomes spontaneously ignited and burns with its characteristic flame colour.

Magnesium burns with a bright white flame to yield solid magnesium oxide

and hydrogen gas when steam is passed over heated magnesium.

The last question is not clear but I believe that it has to do with reaction of sodium and iron with water. Sodium reacts violently with cold water at room temperature to evolve hydrogen gas and aqueous sodium hydroxide.

Iron reacts with steam at red heat to yield hydrogen gas and Fe3O4

Answer:

the number of moles of atom is 0.91584

Answer:

9 is the correct answer

Answer:

521 nm

Explanation:

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

Frequency (v) = 5.76×10¹⁴ s¯¹.

Wavelength (λ) =.?

RECALL: velocity (c) of light = 3×10⁸ m/s

Thus, we can obtain the wavelength of the green light by using the following formula:

c = vλ

3×10⁸ = 5.76×10¹⁴ × λ

Divide both side by 5.76×10¹⁴

λ = 3×10⁸ / 5.76×10¹⁴

λ = 5.21×10¯⁷ m

Next, we shall convert 5.21×10¯⁷ m to nanometer (nm). This can be obtained as follow:

1 m = 1×10⁹ nm

Therefore,

5.21×10¯⁷ m = 5.21×10¯⁷ m × 1×10⁹ nm / 1 m

5.21×10¯⁷ m = 521 nm

Thus, 5.21×10¯⁷ m is equivalent to 521 nm

Therefore, the wavelength (λ) of the photon of the green light is 521 nm.

Answer:

the wavelength (λ) of the photon of the green light is 521 nm.

Answer:

c

Explanation:

i doubt it

The coefficients and molar masses are used to calculate the amounts of molecules. Hence, option C is correct.

The smallest particle of a substance has physical and chemical properties of that substance. Molecules are made up of one or more atoms.

A molecule can be determined by how much is produced in a reaction through the coefficients and molar masses are used to calculate the amounts of molecules.

Hence, option C is correct.

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Answer:

The large the atomic radius the more the metallic character of elements

Explanation:

The atomic radius is related to the metallic character in a way that the larger the atomic radius, the more metallic a body becomes.

Therefore, as we go down a group, metallic character increases.

Answer:

c

Explanation:

i think

Explanation:

every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force

Answer: Newton's 1st law of motion explains how things move and how forces work on their movement, which makes it an extremely important discovery.

Explanation: If we were to place an object into space, we could observe how it behaves without any external influences.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 75 × 2.86

We have the final answer as

Hope this helps you

Answer:

The pressure at the bottom : 19600 N/m²

Given

A ground water tank has its height 2m

Required

The pressure at its bottom

Solution

Hydrostatic pressure is the pressure caused by the weight of a liquid.  

The weight of a liquid is affected by the force of gravity.  

The hydrostatic pressure of a liquid can be formulated:  

[tex]\large{\boxed{\bold {P_h ~ = ~ \rho.g.h}}[/tex]

Ph = hydrostatic pressure (N / m², Pa)  

ρ = density of liquid (kg / m³)  

g = acceleration due to gravity (m / s²)  

h = height / depth of liquid surface (m)  

ρ = density of water (kg / m³) = 1000

g = acceleration due to gravity = 9.8 m/ sec²

The pressure

[tex]\tt P=1000\times 9.8\times 2=19600~N/m^2[/tex]

Answer:

Cells are the simplest structures that can carry out all of the characteristics activities of life.

Explanation:

All living things are made of cells and all cells come from other cells.

Answer:Phosphorus ahs an ocxidation number of 3. Phosphoric acid, H3PO3 has structure where there is one hydrogen (-H), two hydroxyl groups (-OH) and one oxgen (=O) attached to the central phosphorus P

Using the normal rules, H= +1, O = -2, OH = -1 and balancing out the "charges" we get P =+3

Explanation:

Answer:

C based on the number 5, which is easy to use  in calculations

Explanation:

The SI unit system is not based on the number 5.

There are 1825.6 g in a 14.5 moles Lithium permanganate

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass :

[tex]\tt mol=\dfrac{mass}{MW}[/tex]

moles of Lithium permanganate = 14.5

Lithium permanganate (LiMnO4) MW=125.9 g/mol, so mass :

[tex]\tt mass=mol\times MW\\\\mass=14.5\times 125.9~g/mol\\\\mass=1825.6~g[/tex]

Answer:

87.58 L of C₂H₂

Explanation:

We'll begin by calculating the number of mole in 250 g of CaC₂.

This can be obtained as follow:

Mass of CaC₂ = 250 g

Molar mass of CaC₂ = 40 + (12×2)

= 40 + 24

= 64 g/mol

Mole of CaC₂ =?

Mole = mass /Molar mass

Mole of CaC₂ = 250 / 64

Mole of CaC₂ = 3.91 moles

Next, the balanced equation for the reaction. This is given below:

CaC₂ + 2H₂O —> C₂H₂ + Ca(OH)₂

From the balanced equation above,

1 mole of CaC₂ reacted to produce 1 mole of C₂H₂.

Next, we shall determine the number of mole of C₂H₂ produced by the reaction of 250 g (i.e 3.91 moles) of CaC₂. This can be obtained as follow:

From the balanced equation above,

1 mole of CaC₂ reacted to produce 1 mole of C₂H₂.

Therefore, 3.91 moles of CaC₂ will also react to produce 3.91 moles of C₂H₂.

Finally, we shall determine the volume of C₂H₂ produced from the reaction. This can be obtained as follow:

Recall:

1 mole of any gas occupy 22.4 L at STP.

1 mole of C₂H₂ occupied 22.4 L at STP.

Therefore, 3.91 moles of C₂H₂ will occupy = 3.91 × 22.4 = 87.58 L

Thus, 87.58 L of C₂H₂ is produced from the reaction.

Answer:

Partial pressure of O = 11.84 atm

Explanation:

To solve the excersise we think in the partial pressure law with mole fraction.

Mole fraction of gas = Partial pressure of gas / Total pressure

We have data of all the mole fractions:

Let's find out the partial pressure of oxygen in the tank. We replace data in the formula:

0.10 = Partial pressure of gas / 118.4 atm

0.10 . 118.4 atm = Partial pressure of gas → 11.84 atm

If we determine all the partial pressures:

0.70 . 118.4 atm = 82.88 atm → Partial pressure N

0.20 . 118.4 atm = 23.68 atm → Partial pressure He

We can determine the partial pressure of the trimix.

Sum of partial pressures of each gas = Total pressure of the mix

11.84 atm + 82.88 atm + 23.68 atm = 118.4 atm

(A way to see, if our operations were ok)

The partial pressure of oxygen in the tank is required.

The partial pressure of the oxygen in the tank is 11.84 atm.

[tex]x_o[/tex] = The mole fraction of oxygen = 10%

[tex]p[/tex] = The total partial pressure in the tank = 118.4 atm

The mole fraction of a gas is equal to the ratio of partial pressure of the gas to the total partial pressure.

[tex]x_o=\dfrac{p_o}{p}\\\Rightarrow p_o=x_op\\\Rightarrow p_o=0.1\times 118.4\\\Rightarrow p_o=11.84\ \text{atm}[/tex]

The partial pressure of the oxygen in the tank is 11.84 atm.

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Answer:

J.J Thompson make use of creativity to explain cathode ray tube experiment.

Also, creativity was used by Daltons to explain Joseph Proust's work.

Explanation:

This problem is all about the the beginning part of chemistry that is the atomic  theory. The atomic theory was starts from the time of people like Democritus and down to people like J.J Thompson and John Dalton. Although it has been registered and credited that Dalton is the father of atomic theory many people has also worked on it before him for instance person like Joseph Proust. The reason behind this because some works that has been done by other people such as Democritus[who was the first person to start atomic studies] does not have any scientific evidence.

Creativity is needed when it concerns scientific research and investigation. This is what scientists such as John Daltons and J.J Thompson have used. J.J Thompson make use of creativity to explain cathode ray tube experiment. Also, creativity was used by Daltons to explain Joseph Proust's work.

Answer:

C. democritusm John dalton, JJ Thomason, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.

The correct order of the scientists in order of their work related to the

structure of an atom from earliest to most recent include Democritus, John

Dalton, JJ Thomson, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.

Democritus was regarded as one of the earliest scientist who first proposed

atomic theory around 460 BC which was then modified and used by others

such as John Dalton, JJ Thomson, Ernest Rutherford and Neils Bohr.

The most recent of them all was Erwin Schrodinger which was  the wave

equation for electron movements in the 20th century.

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Answer:

A. It is the ratio of the concentrations of products to the concentrations of reactants.

Explanation:

The equilibrium constant of a chemical reaction is the ratio of the concentration of products to the concentration of reactants.

This equilibrium constant can be expressed in many different formats.

Answer: A

Explanation:

a p e x

Answer:

the variable A represented specific heat capacity

Answer: The Variable T

Explanation:

Answer:

Concepts: Physical Forces

Answer:

I think it is true you should go for true

Answer:

b) Exothermic

Explanation:

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂   →  CO₂

ΔH = -393 Kj/mol

it can be written as,

C + O₂   →  CO₂ + 393 Kj/mol

Answer:

A. car moving down the highway

Explanation:

Potential energy is when the energy is being held in, as in, it is very still, and not moving.

When a car is moving down a highway, it is releasing kinetic energy, instead of potential.

Answer:

a) p waves travel slower then 5 waves

Describe the characteristics of the water at the mountain source:

Answer:

The answer is below

Explanation:

Speed: there will be faster speed due to the steep slope movement of water from the mountain.

Temperature: there will be lower temperatures as a result of the faster speed of water movement which reduces the influence of solar radiation on it.

Oxygen: the oxygen content is higher due to little or no residue particles present in it.

Nutrient Level: this is considered somewhat low as a result of the water coldness and speed which does not support the nutrition base to form.

Answer:

3

Explanation: