Answer:
Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
Explanation:
Answer:
Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them.
Explanation:
a) False.
Hydroelectric power is arenewable source of energy generated from moving water
b) True.
Oil is a non-renewable source used to make jet fuel
c) False
Propane is a byproduct of natural gas which is a non-renewable source of energy
d) False
Energy from the sun is a renewable source of energy
Ans : b) True
Answer:
B
Explanation:
-> Hence, option B is correct.
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total oxidation numbers is the same for both the reactants and the products.
-> represents a balanced chemical equation.
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b. period number.
c. number of protons.
d. number of valence electrons.
The chemical properties of an element are largely determined by the number of valence electrons. Thus option D is correct.
Valence electrons an atom is defined as the number of electron which lose or gain the nearest noble gas or inert gas electronic configuration.
The valence electrons are the main part of chemical reactions as these contain more energy as compared to the electrons present in inner orbits.
The number of valence electrons present helps to determine the chemical properties of element like valence or valency, bonds with other elements.
It also show a picture of the mechanism of bond formation of an atom, the number of unpaired electrons and how many atoms can take part.
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