CHEMISTRY HIGH SCHOOL

An atom has 5 protons and 7 neutrons. What is its mass number?

Answers

Answer 1
Answer: Mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
Answer 2
Answer: Mass number = No. of protons + No. of neutrons

= 5 + 7

= 12 u.

Thus, the answer is 12 u.

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HIGH SCHOOL

Why is it harder to remove an inner shell electron than a valence electron from an atom

Answers

I should think because the valence bonds want to escape and bond more whereas the inner layers are for the most part stable
They're closer to the nuclei....ionization energy is higher. having inner shells and a valence only means that the inner shells are conpletely filled and stable.
valence electrons are easily removed only if the number of electrons is =
MIDDLE SCHOOL

Compounds can be broken down by using what method?

Answers

Answer:

chemical change

Explanation:

chemical change requires energy in the form of heat or electricity.

MIDDLE SCHOOL

23.Explain why children often look like their parents.

Answers

Because children get 50% of their chromosomes from each parent.

not if they are adopted!

but anyway, i am.

genetics is the answer.

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Lil_Naz_Gaming!

HIGH SCHOOL

Which would be best suited to form a circuit?

Answers

Metal Wire would best be suited
The metal wire is the most common and the best material
COLLEGE

For main-group elements, are outer electron configurations similar or different within a group? Within a period? Explain.

Answers

Answer:

Same within the groups...

Different within the periods...

Explanation:

The outer configuration is same with a group because of their arrangement in the periodic table. If we see group 1a of alkalies, all of them have 1 electron in their outer shell and this order goes on increasing  up-to noble gases that have 8 electrons in their outer shell each.

This arrangement is called periodicity of the periodic table and elements are arranged according to the periodic law.

Along a period, these properties of outer configuration goes on increasing than within the group.

COLLEGE

Which of the following is NOT true in relation to galvanic corrosion? A it takes place between two dissimilar metals B the metals must be in contact so that electrons can flow between them C one material acts as anode the other as cathode D it can be prevented by blocking EITHER electron flow between the metals OR ion flow between the metals the cathode will suffer material loss (corrosion) E

Answers

Answer:

the cathode will suffer material loss

Explanation:

Galvanic corrosion is a type of corrosion which is caused due to difference in electrode potential of two metals.

Thus it is true that: it takes place between two dissimilar metals

the metal with less standard electrode potential will undergo corrosion as it will act as anode and the other will acts as cathode. The electron transfer will occur only when the cathode and anode are in direct contact with each other, thus it is true to say that,

the metals must be in contact so that electrons can flow between them

one material acts as anode the other as cathode

The one and best way to prevent galvanic corrosion is two block the direct contact between the two metals so that there cannot be any electron flow between cathode and anode hence we use rubber gasket kind of insulating material.

The anode undergoes oxidation and lose electrons and it is the one which suffers material loss in the process. Hence the given statement that the cathode will suffer material loss is wrong.

HIGH SCHOOL

Imagine that a chemist is trying to establish whether a piece of rock is from a meteorite that fell from outer space. the rock contains more copper-65 atoms than copper -63 atoms. what can you conclude

Answers

The sample is likely to be from a meteorite.

The reason for this is the fact that the isotope Copper-63 is more abundant on planet Earth than the isotope Copper-65 is. Therefore, if a sample of rock has Cu-65 in a greater quantity, it is likely to be from outer space. Many other elements entered the Earth's crust as a result of meteorite impacts, such as Iron (Fe).
HIGH SCHOOL

Which is an example of an atom? A)
The smallest unit of Ne.
Eliminate

B)
The smallest unit of P4.

C)
The smallest unit of NH3.

D)
The smallest unit of H2O.

Answers

I believe the correct answer from the choices listed above is option A. The smallest unit of Ne would be an example of an atom. An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
Hope this answers the question. Have a nice day.

Answer:

option A

Explanation:

MIDDLE SCHOOL

What is the significance of a chemical formula

Answers

chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.

A.  

electrical

 B.  

balanced

 C.  

unbalanced

 D.  

frictional


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