Homework 2
What is matter?What are elements?
What is the structure of an atom?
What are the most common elements in the earth’s crust?
How is the periodic table organized?
What are metals?
Where are they located on the periodic table?
What are compounds?
What is a molecule?
What are mixtures?
What are some physical properties?
How do solids, liquids, and gases differ?
What is it called when matter changes from a gas to a liquid to a solid?
How do melting, freezing, sublimation, and condensation differ?
How can volume be described?
What is it called when atoms bond?
How does the state of matter and adding energy affect the movement of particles?
How does the state of matter and adding energy affect the distance of particles?
Describe how matter changes phases?
What are diffusion, active transport and osmosis?
How does the periodic table tell you about an element?
What is the nature of an atom?
How has atomic theory changed?Name three scientists and their contribution
What are subatomic particles?
What is the charge of electrons, protons, and neutrons?
What is an atomic mass unit?
What is an isotope?
How are isotopes represented?
What are some atomic models?
What is the wave mechanical or electron cloud model?
How do energy levels relate to electrons?
What happens when an electron gains energy?
How can elements be identified?
What are valence electrons?
Checklist of things to know
3.1a The modern model of the atom has evolved over a long period of time through thework of many scientists.
3.1b Each atom has a nucleus, with an overall positive charge, surrounded bynegatively charged electrons.
3.1c Subatomic particles contained in the nucleus include protons and neutrons.INDICATOR 3.1Chemistry 17
3.1d The proton is positively charged, and the neutron has no charge. The electron isnegatively charged.
3.1e Protons and electrons have equal but opposite charges. The number of protons equals the number of electrons in an atom
posted by James @ 7:03 AM
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