Matter and Mixtures
Give an example of a heterogenous mixture
(Example: salad)
What does the atomic number represent?
The number of protons in an atom.
Name one element from alkali metals.
Lithium (example)
What happens when a substance undergoes a chemical change?
Chemical: new substances form.
How to classify water.
Compound
Pure substances have one type of: _________
Particle
How do you determine the number of neutrons?
Mass number – atomic number = neutrons.
What element is in Period 3, Group 16? Is it a metal, non-metal, metalloid?
Sulfur – non-metal.
Is density a physical property or chemical property?
Physical
How to classify gold
Element
Explain why saltwater is homogeneous and salad is heterogeneous.
Salt dissolves evenly; salad has visible different parts.
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Carbon
What are some physical properties of non-metals?
Non-metals: dull, insulators, brittle
Is melting ice a physical or chemical change?
Physical – state change only.
Name all of the diatomic elements
HOBrFINCl.
Is CO2 a compound or a mixture?
Compound
What subatomic particle is not in the nucleus?
Electrons
What does the group number tell you about the electrons for main group elements?
Number of valence electrons for main-group elements.
Is rusting a physical or chemical change?
Chemical – new substance formed.
How to classify air.
Mixture.
Describe how to separate iron filings and sulfur powder.
Use a magnet to attract the iron filings.
Calculate subatomic particles in Na (11, 23).
11 protons, 12 neutrons, 11 electrons.
What does the period number tell you about the electrons?
Number of electron shells.
Is inertness a physical property or a chemical property?
Chemical
Define element, compound, and mixture.
Element – one type of atom, Compound – chemically bonded atoms, Mixture – physically combined.