What is a row on the periodic table called?
Each row on the periodic table is called a period
What is a pure substance made of two or more elements that are combined chemically called?
A compound is a pure substance made of two or more elements that are chemically combined.
What is the simplest pure substance that cannot be broken down into any other substance called?
An element is the simplest pure substance that cannot be broken down into any other substance.
Two or more substances that are together but not chemically combined are called ___________
A mixture is two or more substances that are together but not chemically combined.
What is a column on the periodic table called?
A column on the periodic table is called a group.
What is the region around the nucleus where the electrons can be found called?
The region around the nucleus where electrons can be found is called the energy level.
Identify the atomic number. How many protons does it have? How many electrons does it have?
Formula for Sulfuric Acid (H2SO4)
How many Hydrogen atoms are in molecule of sulfuric acid? How many Sulfur atoms are in one molecule of sulfuric acid? How many oxygen atoms are in one molecule of sulfuric acid?
What were two discoveries that helped change the model of an atom over time?
1. J.J. Thompson found that atoms contained negatively charged particles and some sort of positive charge that became known as the electrons
2. Rutherford found that an atom's positive charge was clustered together in a region called the nucleus.
What are two characteristics of ionic compounds?
Ionic compounds are hard, brittle crystals with high melting points. When they are melted or dissolved they conduct electricity.
Why do polar and nonpolar molecules have different properties?
Polar bond is a bond in which electrons are shared unequally.
Nonpolar bond is a bond in which electrons are shared equally.
What is the difference between an ionic and covalent bond?
Ionic bonds form when atoms transfer to fill their outermost energy level.
Covalent bonds form when atoms share electrons to fill their outermost energy level.
What are the properties of metals?
Properties of metals are: good conductors of heat, conduct electricity, can be reshaped easily, luster-shiny
What accounts for the properties of metals?
A "sea" of electrons hold the metal atoms together loosely. Therefore, they can bend or reshape. The electrons are free to roam,so they can conduct electricity and heat.