Chemistry General Knowledge
What is the basic definition of Chemistry?
Chemistry is what matter is and how it changes.
What are the two major classifications of matter?
Pure substances and Mixtures
What is a physical change?
Anything that changes the appearance but not the identity of a substance.
What type of matter is water (H2O)?
Pure Substance, compound
What is the periodic table made of?
Elements
What is a chemical?
Anything with a defined composition. (Pure substance)
What are the two types of pure substances?
Elements & Compounds
What is a chemical change?
Anything that changes the chemical identity of a substance
What type of matter is coffee (the drink)?
Mixture, homogenous
What are vertical columns called on the periodic table?
What is an atom?
The smallest unit of matter that maintains the same chemical identity.
What are the two types of mixtures?
homogeneous and heterogeneous
Liquid water boiling and turning to steam is what type of change?
Physical
What type of property is Sodium's ability to react with water?
Chemical Property
What are horizontal rows called on the periodic table?
Periods
What are the four signs that a chemical reaction has taken place?
Color Change, Heat & Light, Gas forming, Precipitate forming
A different name for a homogeneous mixture is a...
Sugar dissolves in iced tea
Physical Change
What type of matter is Aluminum metal?
Pure Substance, element
What are the 3 main types of elements on the periodic table?
Metals, Nonmetals, & Metaloids
Name 3 different branches of Chemistry.
What is the difference between an element and a compound.
Compounds are pure substances that are made of atoms from multiple elements.
A log is chopped into small pieces and then burned in a bonfire.
Physical change then Chemical change
What type of property is the boiling point of liquid nitrogen?
Physical Property
What is the name of the last column of elements (group 18)?