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Unit 2 Test

QuestionAnswer
What is the difference between an atom and a molecule? An atom is the smallest unit of a chemical element, while a molecule is a group of two or more atoms chemically bonded together
What is the difference between a compound and a molecule? Compounds have 2 or more elements (CH4), while molecules have 2 or more atoms which may or may not be the same element.
What happens when an electron loses energy? Electromagnetic radiation in the form of light is released
Organic compounds ALWAYS contain? Hydrogen and Carbon
What are the four most common elements in living things? HONC
Why is a water molecule polar? What end of the molecule has a slight negative charge and which has a slight positive charge? unequal sharing of electrons, oxygen -, hydrogen +
What causes the oxygen end of the molecule to have a slight negative charge? oxygen is more electronegative than hydrogen
How do water’s special properties contribute to life? Water molecules are attracted to each other, forming hydrogen bonds that create surface tension, which provides habitats for some aquatic insects and helps water move up plant tissues. Water molecules are also attracted to other polar molecules, which
Created by: 8337752475
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