The isotope atoms differ in ?

Answers

Answer 1

Answer: An isotope is formed basically when the amount of neutrons are different than the amount of protons in the nucleus. Therefore, we'd get a variation in the atomic mass (number of neutrons and protons). This is what makes isotopes different.

So, the answer would be: Isotope atoms differ in neutrons.

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How can a redox reaction be used as a source of electrical energy?

Answers

A redox reaction be used as a source of electrical energy only when two half-reactions are physically separated. The electrons that are released at the anode flow through the wire, producing an electric current. Galvanic cells therefore transform chemical energy into electrical energy that can then be used to do work.

Explanation:

Electrical energy is the energy produced due to flow of electrons.

Whereas a reaction in which oxidation and reduction reaction takes place is known as a redox reaction. Basically, there is exchange of electrons that take place in a redox reaction.

For example, $H_(2) + F_(2) \rightarrow 2HF$

Oxidation half reaction: $H_(2) \rightarrow 2H^(+) + 2e^(-)$

Reduction half reaction: $F_(2) + 2e^(-) \rightarrow 2F^(-)$

Hence, this flow of electrons acts as a source of electrical energy.

Which substance is an example of an element?A) bronze
B) copper
C) methane
D) rust

Answers

Copper is an element. An element is a substance that is entirely made from one type of atom.

It is B. I took the test!!

The following reaction does not proceed to a product: H2O + Cu --> no reaction. Why is that? a.Copper has a lower activity than hydrogen and cannot replace it.
b.The reaction cannot occur because water is a reactant.
c.Copper has a higher activity than hydrogen and cannot replace it.
d.The reaction proceeds too slowly to create products.

Answers

I think the correct answer would be because copper has a lower activity than hydrogen and cannot replace the bonds in it. Substances that are not oxidizing do not react with copper since the redox potentials are very low. Hope this answers the question.

The reason why H₂O +Cu does not proceed to a product is that

copper has a lower activity than hydrogen and cannot replace it (answer A)

Explanation

Replacement reaction is type of a reaction in which element react with compound and take place of another element in that compound.

That is the more reactive element replaces the less reactive element from it's compound.

Since H₂ is more reactive than Cu in reactivity series therefore no reaction occur between H₂O +Cu since Cu cannot replace H₂ from its compound.

Which activity is the best demonstration of J. J. Thomson’s use of creativity in his work?

Answers

Through J.J. Thomson's creative mind, he proposed the "Plum Pudding Theory" which shows the scientific model of an atom wherein electrons are attached to the body of the atom as if it was like a raisin in a pudding. He also consolidates the properties of atoms at that time such as: electrons are negatively charge particles and and atom has neutral charge.

3.Write the symbol of the element that has a charge of +1 when it has 71 electrons.

Answers

The symbol : $\tt _(72)^(178)Hf^(+1)$

Further explanation

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): protons, electrons, and neutrons

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

The element has 71 electrons and a charge of +1 , so

Number of protons = 71 + 1 = 72

Number of protons = the atomic number = 72

The element with atomic number 72 is Hafnium(Hf)

The atomic mass of Hf = 178 g/mol

If the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, Cd(NOÀ)¿?

Answers

2x14.01 =28.02
ans is B

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