11. It focuses on the analysis of the synthesis, composition, breakdown, and chemical reactions that occur in living organisms?
(a) Organic chemistry
(b) Bio chemistry
(b) Inorganic chemistry
(d) Analytical chemistry
answer
(b) Bio chemistry
12. Who first proposed the dual nature of matter theory?
(a) Broglie
(b) Beruni
(c) Ibe sina
(d) Jabir bin Hayiyan
answer
(a) Broglie
13. something that occupies space and has mass?
(a) Matter
(b) Element
(c) Mixture
(d) Compound
answer
(a) Matter
14. What is the name of a substance in its purest form?
(a) Matter
(b) Substance
(c) Mixture
(d) Pure substance
answer
(b) Substance
15. What is an element’s shortest name called?
(a) Substance
(b) symbol
(c) namee
(d) Element
answer
(b) symbol
16. What is a pure substance made of when two or more different types of elements are chemically mixed in a predetermined mass ratio?
(a) Compound
(b) Mixture
(c) Element
(d) Formula
answer
(a) Compound
17. How many different kinds of mixtures exist?
(a) 7
(b) 3
(c) 4
(d) 2
answer
(d) 2
18. A combination whose mass-scale composition is constant?
(a) Mixture
(b) Heterogeneous mixture
(c) Compound
(d) Homogenous mixture
answer
(d) Homogenous mixture
19. The amount of protons in the nucleus of one atom of an element determines its atomic number, right?
(a) Atomic number
(b) Atomic mass unit
(b) Mass number
(d) None of these
answer
(a) Atomic number
20. Mass number is known as?
(a) Nucleon number
(b) Number
(c) Atomic number
(d) Mass number
answer
(a) Nucleon number
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