7. Wherever necessary, neat and properly labeled diagrams should
Section
0.1 Which of the following is a chemical change-
Fermentation of grapes or melting of wax?
Q.2 What is an ion write its types?
0.3 A boy starts from position X and moves 20m towa
displacement of the boy?
0.4
Which cell organelle synthesize the protein?
0.5 State Newton Third law of motion?
Q.6 Which element was used by Rutherford for Alpha se
Q.7 What is the name given to the solution in which no
Q.8 Complete the following :-
Mass number = Number of Proton +
Which microorganism is responsible for the followi
(a) Common cold
(b) Typhoid
10
Define unbalanced force?
Answers
Answer:
So far, we have discussed elements and compounds that are electrically neutral. They have the same number of electrons as protons, so the negative charges of the electrons is balanced by the positive charges of the protons. However, this is not always the case. Electrons can move from one atom to another; when they do, species with overall electric charges are formed. Such species are called ions. Species with overall positive charges are termed cations, while species with overall negative charges are called anions. Remember that ions are formed only when electrons move from one atom to another; a proton never moves from one atom to another. Compounds formed from positive and negative ions are called ionic compounds.
Individual atoms can gain or lose electrons. When they do, they become monatomic ions. When atoms gain or lose electrons, they usually gain or lose a characteristic number of electrons and so take on a characteristic overall charge. Table 3.6 “Monatomic Ions of Various Charges” lists some common ions in terms of how many electrons they lose (making cations) or gain (making anions). There are several things to notice about the ions in Table 3.6 “Monatomic Ions of Various Charges”. First, each element that forms cations is a metal, except for one (hydrogen), while each element that forms anions is a nonmetal. This is actually one of the chemical properties of metals and nonmetals: metals tend to form cations, while nonmetals tend to form anions. Second, most atoms form ions of a single characteristic charge. When sodium atoms form ions, they always form a 1+ charge, never a 2+ or 3+ or even 1− charge. Thus, if you commit the information in Table 3.6 “Monatomic Ions of Various Charges” to memory, you will always know what charges most atoms form. (In Chapter 9 “Chemical Bonds”, we will discuss why atoms form the charges they do.)
Table 3.6 Monatomic Ions of Various Charges
REQUEST: MAKE ME BRAINLLY PLEASE
Answer:
1.Fermentation of grapes is chemical change as the yeast which is responsible for fermentation digests the sugar in grapes in order to form vine
2.an ion is a positively or negatively charged atom. An ion is formed by the loss and gain of electrons by an atom, so it contains unequal number of protons and electrons. Example: sodium ion, chloride ion.
4. The cell organelle which synthesizes in protein is ribosomes.
5.The Newton's Third Law of motion is when 2 bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction.
6. Rutherford's alpha particle experiment is also known as gold foil experiment as Rutherford used gold foil in it.
8.Mass number=number of protons + number of electrons.
9.Virus is responsible for common cold. And typhoid is caused Salmonella Typhi bacteria.
10.Unbalanced Force
A force where 2 forces acting in opposite directions on a body, are not equal in magnitude and in size, is known as unbalanced force.