Types of Matter
What type of matter has a fixed composition and includes elements and compounds?
Substance
The ability of a substance to conduct electricity is this type of property.
Physical Property
What is the formula used to calculate density?
D= m/V
In this state of matter, particles are packed closely together and vibrate in place.
Solid
The phase change from solid to liquid is called this.
Melting
Salt water is an example of this type of mixture because it has a uniform composition throughout.
Homogeneous Mixture
Burning wood is an example of this change because new substances are produced.
Chemical change
An object has a mass of 50g and a volume of 10 mL, what is its density?
5 g/mL
Unlike solids and liquids, particles in this state are far apart and move freely.
Gas
The phase change from gas to liquid is called this.
Condensation
Which contains only one type of atom: an element or a compound?
Element
Is density a physical or chemical property?
Physical property
A rectangular block measures 5cm x 2cm x 3cm and has a mass of 90g. What is its density?
3g/cm3
As the temperature of a substance increases, the average kinetic energy of its particles does what?
Increases
Is boiling water a physical or chemical change? Explain why.
Physical change, because water remains H₂O; only its state changes.
A student mixes oil and water in a beaker. After sitting for a few minutes, the oil forms a separate layer. What type of mixture is this
Heterogeneous mixture
When ice melts, which properties change: its chemical identity, state of matter, or both?
State of matter changes, but its chemical identity stays the same.
A rock has a mass of 75 g. The water level in a graduated cylinder rises from 40 mL to 65 mL when the rock is added. What is the rock's density?
3g/mL
Which state of matter has the strongest intermolecular forces: solid, liquid, or gas?
Solid
On a heating curve, the sloped sections represent temperature changing within a single phase. What do the flat sections represent?
Phase changes
Carbon dioxide (CO2) is a compound while oxygen (O2) is an element. Explain the difference between the two.
A compound contains two or more different elements chemically bonded together.
An element contains only one type of atom.
A piece of metal has a shiny appearance, conducts electricity, and reacts with acid to produce gas. Which of these is a chemical property?
Its ability to react with acid.
An object has a density of 2 g/cm³ and a volume of 15 cm³. What is its mass?
30 g
A sample is heated. Its particles begin moving faster, but the particles themselves do not become larger. What has increased?
A substance changes from gas → liquid → solid. Name both phase changes.
Condensation → freezing