A sample of salt (sodium chloride) is placed on the tip of a platinum wire. When the sample is heated on blue flame the flame turned yellow. Explain how this can be done to electrons in sodium atoms

Answers

Answer 1

Answer: So platinum is a transition metal. In general transition metals are reducers, which means they can give the electrons they have, to the sodium atoms. Also in chemistry we look at sub orbitals rather that shells(2,8,8). So due to the energy from heat, the d orbital split as electrons move to a higher energy level. Some of the electrons are given to the sodium ions and therefore the flame changes colour to yellow.
The excitation of the electrons is caused by them getting energy and so moving up an energy level. This energy is released and the electron returns to it's original state. The energy released, however, does not release in the same direction, but in different/various directions. Therefore the colour of the light changes as some energy is released in the surrounding.

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True or False: Mechanical weathering is the breakdown or rock by changing its chemical composition.

Answers

Answer:

False

Explanation:

Mechanical weathering breaks rocks into smaller pieces without changing their composition. Ice wedging and abrasion are two important processes of mechanical weathering. Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface.

Hope this helps☺️

Answer: False

Explanation:

That’s not using mechanics

In which reaction is soap a product?(1) addition (3) saponification
(2) substitution (4) polymerization

Answers

Saponification because you can rearrange the letters to spell soap.

There are more hydroxide ions in a solution than hydrogen ions. The solution is acidic

basic

neutral

a salt

Answers

The hydroxide ion concentration is what is used to measure the POH of a substance (basicity) thus with more hydroxide that hydrogen ions, the solution is Basic.

The molarity of an aqueous sodium phosphate solution is 0.650 M. What is the molality of sodium ions present in this solution? The density of solution is 1.43 g/mL.

Answers

Answer:

molality of sodium ions is 1.473 m

Explanation:

Molarity is moles of solute per litre of solution

Molality is moles of solute per kg of solvent.

The volume of solution = 1 L

The mass of solution = volume X density = 1000mL X 1.43 = 1430 grams

The mass of solute = moles X molar mass of sodium phosphate = 0.65X164

mass of solute = 106.6 grams

the mass of solvent = 1430 - 106.6 = 1323.4 grams = 1.3234 Kg

the molality = $(moles of solute)/(mass of solvent in kg)=(0.65)/(1.323)= 0.491m$

Thus molality of sodium phosphate is 0.491 m

Each sodium phosphate of molecule will give three sodium ions.

Thus molality of sodium ions = 3 X 0.491 = 1.473 m

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.

Which term identifies a type of nuclear reaction?(A) fermentation
(B) reduction
(C) deposition
(D) fission

Answers

of the above options you've given, the only nuclear reaction is fission.

fermentation is when organic matericals go bad and delope mold for exg,

reduction is when atoms of elements have their oxidation states changed (exg rusting)

deposition is when molecules set out in any sort of solution.

Answer: Option D) is correct which is fission

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