Properties of Pure Substances
This property describes how well a solid dissolves in a liquid.
What is SOLUBILITY?
When you add thermal energy to ice, it changes into this state of matter.
What is a LIQUID?
This type of mixture has particles evenly spread throughout, like salt water.
What is a SOLUTION?
This number on the periodic table tells you how many protons are in an atom.
What is the ATOMIC NUMBER?
Elements in Group 1 (alkali metals) are this reactive.
What is VERY REACTIVE or HIGHLY REACTIVE?
A pure substance that conducts electricity well is likely made of these charged particles.
What are IONS?
Particles move faster when this is added to a substance.
What is THERMAL ENERGY or HEAT?
A pure substance has a definite melting point, but this does not.
What is a MIXTURE?
Atoms with the same number of protons but different numbers of neutrons are called this.
What are ISOTOPES?
Noble gases in Group 18 have this many valence electrons, making them unreactive.
What is 8?
The mass of a substance divided by its volume gives you this property.
What is DENSITY?
The temperature at which a solid melts into a liquid is called this.
What is the MELTING POINT?
You can separate the salt from salt water using this process.
What is EVAPORATION or BOILING?
Elements in the same vertical column of the periodic table are called this.
What is a GROUP?
As you move down a group, main group elements generally become this reactive.
What is MORE REACTIVE?
Pure water has this solubility in water.
What is COMPLETELY SOLUBLE?
When thermal energy is removed from water vapor, it becomes this.
What is LIQUID WATER or WHEN CONDENSATION OCCURS?
Unlike a mixture, a pure substance has these same properties no matter where it comes from.
What are PHYSICAL or CHEMICAL PROPERTIES?
This tells you the average mass of an atom of an element.
What is ATOMIC MASS?
Halogens are found in this group and are very reactive nonmetals.
What is GROUP 17?
When electrical current flows through a substance easily, this property is high.
What is ELECTRICAL CONDUCTIVITY?
When a model shows particles getting closer together and moving slower as thermal energy is removed, it is showing this.
What is PARTICLE MOTION?
This is a combination of two or more pure substances where you can sometimes see the individual parts.
What is a HETEROGENEOUS MIXTURE?
Horizontal rows on the periodic table are called this, and they indicate how many electron shells an atom has.
What is a PERIOD?
This element in Group 2 (alkaline earth metals) is used in bones and teeth.
What is CALCIUM?