Density
What is the formula for calculating density?
Density = mass / volume
Anything that takes up space and has mass
Matter
A type of model that shows the relative size and number of atoms in a water molecule and how the atoms are joined to one another.
Ball-and-stick model
A state of matter in which the particles are packed together in a fixed arrangement.
Solid
Connections between atoms
Bonds
2 mL of salt water is found to have a mass of 2.4 grams. What is the density of the salt water?
1.2 g/mL
Two or more atoms joined by a chemical bond
Molecule
A type of model that represents only the type and number of atoms in a molecule; used to represent substances in a chemical equation.
Chemical formula
A type of matter in which the particles can move and slide past each other and take the shape of the container they're in.
Substances made up of only one type of atom
Element
An object has a mass of 0.115 grams and the volume is 5 mL. What is its density?
0.023 g/mL
The basic unit of matter
Atom
A type of model that shows how the atoms are oriented in space and their relative size.
Space-filling model
A type of matter in which the particles are far apart, with no regular arrangement.
Gas
An observable characteristic of a substance
Property
An object has a density of 5.3 g/cm3. The volume of the object is 12 cm3. What is the mass of the object?
63.6 grams
A structure made up of smaller, repeating units
Extended structure
Draw a ball-and-stick model of water.
Two hydrogen atoms bonded to one oxygen atom.
Which two substances are both made up of carbon atoms, but have different properties because of their structure?
Diamond and graphite
Write the following number in scientific notation:
93,000,000,000
9.3x1010
An object has a density of 100 g/cm3. The mass of the object is 5 grams. What is the volume of the object?
20 cm3
Solids whose atoms are arranged in a highly ordered, repeating pattern
Crystal
Draw a space-filling model of water.
Two hydrogen atoms overlapping with one oxygen atom.
TRUE or FALSE
Water is different from most other substances because it's molecules expand when it freezes.
True
What is the chemical formula for water?
H2O