Atomic Structure
This is the name for positively charged particles found in the nucleus.
What are protons?
This is usually shown on the Periodic Table using 1-2 letters.
This is the number of atoms of oxygen in B2O3.
What is 3?
This is the name for the electrons of an element that are involved in chemical bonding.
What are valence electrons?
Is air a pure substance or a mixture?
mixture
The Bohr's Model
What does an atom of the element with atomic number 6 always have in its nucleus?
6 protons
2H2 + O2 ---> 2H2O
In the chemical equation above, the substances H2 and O2 are called this.
What are reactants?
2AlCl3 ---> 2Al + 3Cl2
In the chemical reaction above, the substances Al and Cl2 are called this.
What are products?
This law states that matter cannot be created or destroyed.
What is the Law of Conservation of Mass?
This is the maximum number of electrons that the second energy level/orbital will hold.
What is 8?
How many valence electrons are in Group 16?
6
This is the number in a chemical equation that describes how many molecules of each compound are involved in a chemical reaction.
What is a coefficient?
In a chemical reaction the substances to the right of the arrow are called this/these?
Product (s)
Rust and Combustion are common types of: chemical or physical changes?
chemical
The weight of the nucleus is also called the _____.
Why?
atomic mass
Electrons have almost no mass.
What is the "equation" used to find the # of neutrons?
hydrogen + oxygen → water
Where are the reactants and products in this chemical reaction?
Reactants: hydrogen and oxygen
Product: water
This is the name for the numbers that tell how many atoms of an element are present in a molecule of that compound.
What are subscripts?
Is this a balanced or not balanced equation?
H2S + NaCl → HCl + Na2S
not balanced
Nickel's Atomic # is 28. How many orbitals of electrons will this element have, and how many in each?
3 orbitals; 2,8, and 18
Barrium has the Atomic Mass of (about) 137. It also has 81 neutrons. What is Barium's Atomic number?
56
In the formula 5CaSO4,how many oxygen atoms do we have?
20
All of the following are examples of chemical change except:
Increase in temperature, release of light, formation of a solid, melting of ice
melting of ice
The type of reaction that often feels warm to the touch because...
What is a exothermic reaction because the reaction gives off heat energy.