Vocabulary
What is matter?
Anything that has mass and takes up space
What property describes how easily a substance can be hammered into thin sheets?
Malleability
What property describes how easily a substance catches fire?
Flammability
What type of mixture looks the same throughout?
Homogeneous
What type of change is melting ice?
Physical change
What is the smallest unit of an element?
An atom
What property describes how easily a substance can be stretched into wires?
Ductility
What is the ability of a substance to undergo chemical reaction with another called?
Reactivity
What type of mixture has visibly different parts?
Heterogeneous
What type of change is boiling water?
Physical change
What is the difference between a compound and a mixture?
Compounds are chemically bonded; mixtures are physically combined
What is the density formula?
Density = Mass ÷ Volume
Rusting is an example of what type of change?
Chemical change
Element, Compound, or Mixture?
14k Gold
Mixture
What type of change is burning paper?
Chemical change
What is the term for substances made of only one type of atom?
Elements
Which state of matter has definite volume but no definite shape?
Liquid
True or False: Chemical properties can be observed without changing the substance.
False
The human body is mostly made of which element?
Oxygen (by mass)
What is the difference between physical and chemical changes?
Physical changes don’t change identity; chemical changes form new substances
What is volume?
The amount of space an object occupies
What is the difference between a physical property and a chemical property?
Physical properties can be observed without changing identity; chemical properties describe reactivity or flammability
Burning wood is a _____ change because of its _____.
Chemical; flammability
What is the difference between an element and a compound?
Elements are pure substances; compounds are made of two or more elements chemically bonded
What evidence shows a chemical change?
Color change, gas produced, light produced, energy change, precipitate forms