Matter & Chemical Change 1
Elements that are shiny, malleable and ductile
What are metals
Conductivity and malleability are what kind of properties
What are physical properties
The number of protons in the nucleus of one atom of an element
What is the atomic number
Pure substances formed because of attraction between particles of opposite charges
What are ionic compounds
True or false, can most physical changes be reversed?
TRUE
Formed when two or more elements combine chemically
What is a compound
Mixture where the different substances that make it up are visible
What is mechanical mixture
Group 18 in the periodic table
Noble gases
Term used to describe the materials at the start of a reaction
What are reactants
WHMIS stands for...
What is "Workplace Hazardous Materials Information System"
Type of mixture where different substances that make it up are not visible
What is a solution
Change in color or odour, formation of a solid or gas, and release or absorption of heat are all evidence of what ?
What is a chemical change
The sum (total) number of protons and neutrons in an atom
What is the mass number
Chemical reaction that absorbs heat energy
Endothermic reaction
Chemical reaction that releases heat energy
Exothermic reaction
Type of change that results in the formation of a different substance or substances
What is a chemical change
Type of subatomic particle with a negative charge
What is an electron
Vertical columns in the Periodic Table
Group or family
Compounds with low melting and boiling points because the forces between the molecules are weak. Poor conductors of electricity. Can be solids, liquids or gases at room temperature.
Molecular Compounds
Slow chemical change that occurs when oxygen in the air reacts with a metal
Corrosion
Change from a liquid to a gas
What is evaporation
The smallest component of an element, which contains a nucleus
What is an atom
Horizontal rows in the periodic table
Periods
Chemical reaction that takes place in the cells of your body where food reacts with oxygen
Cellular Respiration
Give 4 signs of chemical change
color change, odor change, release of heat, gas is created