Who discovered the electron?

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Answer 1

Answer: J.J. Thomson discovered the electron 1897

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If the pressure P applied to a gas is increased while the gas is held at a constant temperature, then the volume V of the gas will decrease. The rate of change of the volume of gas with respect to the pressure is proportional to the reciprocal of the square of the pressure. Which of the following is a differential equation that could describe this relationship?

Answers

The differential relationship has been $\rm \bold{(dV)/(dP)\;=\;(C)/(P^2)}$ .

The gas has been termed to be the ideal gas. For an ideal gas at a constant temperature, the relationship of the change in pressure and volume can be given as constant. The relationship has been given with the application of Boyle's law.

The product of the pressure and volume has been a constant quantity for a reaction.

Pressure $*$ Volume = Constant

PV = C

V = $\rm (C)/(P)$

Differentiating the equation:

$\rm (dV)/(dt)\;=\;(C)/(P^2)\;(dP)/(dt)$

$\rm (dV)/(dt)\;*\;(dt)/(dP)\;=\;(C)/(P^2)$

$\rm (dV)/(dP)\;=\;(C)/(P^2)$

The differential relationship has been $\rm \bold{(dV)/(dP)\;=\;(C)/(P^2)}$ .

For more information about pressure at a constant temperature, refer to the link:

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Answer:

A differential equation that could describe the relationship of the rate of change of the volume of gas with respect to the pressure is;

V' = $-(C)/(P^2)$ .

Explanation:

Boyle's law states that at constant temperature, the pressure of a given mass of gas is inversely proportional to its volume.

That is;

P₁×V₁ = P₂×V₂ or

P×V = Constant, C

That is V = $(C)/(P)$

Therefore, the rate of change of volume of a gas is given as

$(dV)/(dt) = -(C)/(P^2) (dP)/(dt)$ which gives

$(dV)/(dt) * (dt)/(dP)= (dV)/(dP) = -(C)/(P^2)$

That is the rate of change of the volume of gas with respect to the pressure is proportional to the reciprocal of the square of the pressure.

$(dV)/(dP) = -(C)/(P^2)$ .

V' = $-(C)/(P^2)$ .

Describe and explain the trends in reactivity in different groups of the periodic table, using your knowledge of electronic structure. [6 mark]

Answers

Metal period- Reactivity Gets smaller as you move from left to right.
Group- Reactivity gets bigger as you move down a group.

How are chemicals used to produce colors in fireworks?

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Answer:

The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors. List of colors and elements in Fireworks: Aluminum – Aluminum is used to produce silver and white flames and sparks.

Final answer:

Colors in fireworks are produced by heating certain chemicals until they emit light, creating an emission spectrum. Different chemicals create different colors; for example, sodium compunds create yellow, while lithium creates crimson.

Explanation:

Chemicals are used to produce colors in fireworks by being heated until they are excited and emit light. This produces an emission spectrum which varies based on the element being heated. Sodium and its compounds, for example, produce a bright yellow color. This effect is seen when an electrical discharge is passed through sodium vapor. Lithium, on the other hand, creates a bright, crimson color.

Other alkali metals and their salts also add color to a flame. Even certain alkaline earth metals such as calcium, strontium, and barium give color to a flame giving shades of red and green. In certain specific engines, green and yellow flames are produced using different types of fuel and oxidant mixtures.

Thus, the specific chemicals used and how they're mixed and ignited play a critical role in the color of the resulting fireworks display.

Learn more about Firework Colors here:

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f chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. What kind of reaction took place?

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If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. The kind ofreaction that took place is decomposition reaction. Because sodium iodide is broken down into sodium and iodide atoms.

7 An atom that has 13 protons and 15 neutrons is an isotope of the element(1) nickel (3) aluminum
(2) silicon (4) phosphorus

Answers

an atoms identity is always defined by the number of protons and it is seen in the periodic table so if an atom has 13 protons it will be aluminum

Which of the following descriptions explain the process of water freezing? A. What're molecules speed up until the escape into a different phase.
B. Water molecules slow done until they begin to form stronger bonds together.
C. As water molecules cool, their shape changes from rounded to irregular, making them more likely to link to one another
D.Water molecules are squeezed together by high pressure until they begin to stick to one another.

Answers

The correct option is B.

When the temperature of water is reduced, the water cools down and the molecules of the water lose energy and move slowly. As the water is cooling down its volume expands. When the temperature of the water reaches zero degree Celsius, the molecules of the water stick together and form solid ice, thus turning from a liquid state to a solid state.

The process of freezing occurs when B) water molecules slow down until they begin to form stronger bonds together. These stronger bonds eventually turn the water molecules into a solid formation.

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Which best describes is the ∆G, ∆H, ∆S and T of a forest fire?