Question

Which statements are true? Explain why they are true/ or false.

1. The # of protons in an atoms nucleus determines its chemical identity.

2. The number of electrons an atom has is constant during chemical reactions.

3. Atoms may not lose or gain protons during chemical reactions.

4. Isotopes have the same number of neutrons but different number of protons

5. Neutrons generally play no role in the outcome of a chemical reaction.

Answer 1

1. True, because 1 H Nmr is a example where we determine the chemical identity of a compound by knowing the no. of proton and their behaviour or interaction with neighbouring proton.

2. False, because during reaction there may be a loss or gain of a electron i.e oxidation and reduction.

3. False, Atoms can lose proton by using appropriate base and can gain proton by using acid.

4. False, Isotopes are same atomic number and different mass no.

5. True. There is no role of neutron during chemical reaction. Mostly electron are responsible for chemical reaction.