Lets
The amount of space taken up by an object.
Volume
When matter changes, but no new substances are formed.
Physical Change
The smallest unit of matter.
Atom
A positively charged subatomic particle in the nucleus of an atom.
Proton
The type of bond where atoms with opposite charges attracted to each other by an electrostatic force
Ionic Bond
When matter is in this state, it has a fixed shape and volume.
Solid
What does the atomic number represent in an atom?
Number of protons in the nucleus.
A pure substance
Element
A negatively charged subatomic particle in the nucleus of an atom
Electron
The type of bonding where atoms sharing electrons
Covalent Bond
When matter is in this state, it has no fixed shape or volume.
Gas
When matter changes, and new substances are formed.
Chemical Changes
A collection of atoms, typically of the same element.
Molecule
These electrons orbit an atom’s nucleus at its outermost shell.
Valence Electrons
Is this a homogeneous or heterogeneous mixture?
1) Soda
2) A glass of water with ice cubes
3) Salt water
1) homogeneous mixture
2) heterogeneous mixture
3) homogeneous mixture
When matter is in this state, it has a fixed volume, but no fixed shape.
Liquid
What happens to particles when a substance is cooled?
They get more compact and move slower and less.
A collection of atoms of different elements.
Compound
A neutrally charged subatomic particle in the nucleus of an atom.
Neutron
Physical or Chemical Change?
1) Evaporation of water from a puddle
2) Digestion of food in the body
3) Melting butter
1) Physical
2) Chemical
3) Physical
Draw a picture of a solid, liquid, and gas in a container (3 different pics)
Teacher will draw the answers.
Draw a picture of a molecule and a compound.
Molecule - only one element (EX. O2)
Compound - More than one type of element (EX H2))
When you burn a piece of wood, it changes color and turns to ash. When you try to burn the ash, it does not change color or texture. Why?
The ash is made of the element carbon. Elements cannot break down as they are pure substances.
The center of an atom, formed by protons and neutrons.
Nucleus
Model the substance CO2.
C with a circle around, 2 O's with circles around them with lines connecting