[38] An isotope has a half life of 20 years. How long will it take this isotope

Question

[38] An isotope has a half life of 20 years. How long will it take this isotope to decay to half its original amount?
A) 10 years
B) 40 years
C) 20 years
D) none of the above

[39] A bond that forms between two non metals would be
A) metallic
B) ionic
C) covalent
D) none of the above

[40] What is the difference between a compound and a mixture?
A) They both consist of atoms from different elements
B) Their atoms are bonded differently.
C) One is solid and one is a liquid
D) The components of a mixture are not chemically bonded together

Explanation / Answer

38. c) 20 years

39. C) Covalent

40. D) The components of a mixture are not chemically bonded together

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