Changes of Matter
This type of change alters the form of a substance without changing its identity.
What is a physical change?
This property depends on the ratio of mass to volume.
What is density?
This property of a substance is able to determine its identity.
What is specific heat capacity?
This variable describes the force of gas particle collisions with container walls.
What is pressure?
This subatomic particle has a positive charge and is found in the nucleus.
What is a proton?
This type of change results in the formation of one or more new substances.
What is a chemical change?
This classification of matter has a fixed composition and uniform properties.
What is a pure substance?
This type of process absorbs energy from its surroundings.
What is an endothermic process?
This particle-level explanation supports all gas laws.
What is kinetic molecular theory?
This part of an atom contains all the mass and can be found at the center.
What is the nucleus?
This observation provides evidence that a chemical change has occurred.
What is the formation of a gas, precipitate, a color change, or a temperature change?
This explains why cutting an object in half does not change its density.
What is because mass and volume change proportionally?
This explains why temperature stays constant during a phase change.
What is because energy is used to overcome attractions between particles?
This explains why increasing temperature increases gas pressure in a closed container.
What is because particles move faster and collide more forcefully?
What is an ion?
This explains why melting ice is not considered a chemical change.
What is because the substance remains H₂O?
This reasoning explains why oil floats on water.
What is because oil is less dense than water?
This is when heat stops transferring between two objects.
What is thermal equilibrium?
This describes the relationship between volume and pressure when temperature is constant.
What is an inverse relationship?
These two subatomic particles contribute to the mass of an atom.
What are the proton and neutron?
This reasoning explains why burning paper cannot be reversed.
What is because new substances are formed?
This type of mixture appears uniform but is still made of multiple substances.
What is a homogeneous mixture?
This is the process of measuring the transfer of heat.
What is calorimetry?
STP is an acronym for this.
What is standard temperature and pressure?
This subatomic difference causes isotopes to have different atomic masses but the same chemical identity.
What is a different number of neutrons?