Why is it harder to remove an inner shell electron than a valence electron from an atom
Compounds can be broken down by using what method?
chemical change requires energy in the form of heat or electricity.
23.Explain why children often look like their parents.
not if they are adopted!
but anyway, i am.
genetics is the answer.
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Which would be best suited to form a circuit?
For main-group elements, are outer electron configurations similar or different within a group? Within a period? Explain.
Same within the groups...
Different within the periods...
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.
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
the cathode will suffer material loss
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.
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
Which is an example of an atom? A)
The smallest unit of Ne.
The smallest unit of P4.
The smallest unit of NH3.
The smallest unit of H2O.
What is the significance of a chemical formula
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.