Which of the following statements are true? (1) A molecule is a group of two or...
Which of the following statements are
true?
(1) A molecule is a group of two or more atoms that functions as a
unit because the atoms are bound together by chemical forces.
(2) The crushing of ice to make ice chips is a physical procedure
that involves a chemical change.
(3) Most naturally occurring samples of matter are mixtures rather
than pure substances.
Homework Answers
Correct options:
(1) A molecule is a group of two or more atoms that functions as a unit because the atoms are bound together by chemical forces.
(3) Most naturally occurring samples of matter are mixtures rather than pure substances.
---
Explanation:
(1) is correct. For example, H2 is a molecule. It is made up of 2 hydrogen atoms. There is covalent bonding interaction between the two hydrogen atoms.
(2) is incorrect. The crushing of ice to make ice chips does not produce a substance with different chemical properties. Hence, it doesn't involve a chemical change.
(3) is correct. For examples, ores are mixture of compounds of different elements.
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