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2nd 6 weeks Test Q/A

Periodic Table, Changes, & Properties

What are the 2 most abundant elements in the Earth's Crust? Oxygen & Silicon
What are the 2 most abundant elements in the Atmosphere? Nitrogen & Oxygen
What are the 2 most abundant elements in the Human Body? Oxygen & Carbon
What are the majority of elements on the Periodic Table? 75% of it? Metals
What is a metalloid? A mixture of properties of a metal & nonmetals
What is a chemical change? A change which the substance is an entirely new one, and occurs with a chemical reaction.
What is a physical change? A change which the substance's appearance changed and it is chemically the same thing.
What are the 5 indicators of a chemical change? -Color Change -Heat is absorbed -Gas produced -Light or Heat produced -Solid participate
Is boiling a chemical or physical change? Why? Physical, because it is a change in state.
What elements make up H2O? Hydrogen & Oxygen
How many Elements are in this substance? H9AuW3 3 elements
Is CO2 an element or compound? Compound
Created by: GuguLara