Matter
A property observed and measured that changes the chemical identity
Chemical change
What is mass?
How much matter an object has
How are the particles of a solid?
Packed closely together. They are fixed in place and cannot move easily
Give an example of a physical change
crushing a can
melting ice cube
boiling water
chopping wood
Basic unit of all matter
atom
How do we measure volume?
cubic meters, cubic centimeters, etc
What are the two types of solids?
Amorphous and crystalline
give an example of chemical change
burning wood
iron rusting
cooking an egg
vinager and baking soda
A pure substance made by the same type of molecules with a set ratio
Compound
What is density?
Is a measure of the mass of the material in a given volume.
Describe a liquid.
They have a definite volume but no shape of its own.
What is the law of conservation of mass
Matter is neither created nor destroyed only transformed
A substance that consists of only a tyoe of atoms
element
What is the unit of density?
grams over cubic centimeters
kilograms over cubic meter
What are the physical properties of liquids?
Surface tension and viscosity
Energy released is greater than energy needed to break bonds.
This is an example of...
Exothermic Reaction
A molecule is a group of atoms bonded together. What is the force of attraction between them called?
Chemical bond
Why does warm gases rise?
Density of gases depends of temperature, the higher the temp., the lower the density, thats why they rise
Describe the physical properties of a gas
They will have the same volume as the volume of its container.
Particles will be moving in all directions and widely spread and collide with each other.
A reaction that needs a continous source of energy
Endothermic reaction