Bonding
Non Metal + Non Metal
Covalent Bond
All compounds are made of two or more
Elements
Two or more substances, elements, compounds or both but not chemically combined.
Mixture
List the four steps to balance an equation
Write the equation
Count the atoms
Use coefficients to balance atoms
Check and count atoms again
A solid that forms during a chemical reaction is called
Precipitate
Formed when atoms are held together by the attraction between opposite charges.
Ionic bond
What are the name of this elements?
Au and Ag
Gold and Silver
What is this?
Each element has a specific number of valence electrons, ranging from 1-8 or more.
Electron dot diagram.
List the four types of chemical equations
Synthesis
Decomposition
Single-Replacement
Double-Replacement
What is a physical property? Why is it different than a chemical?
Physical properties do not change de chemical composition of the object or substance.
Chemical properties change the essence and chemical composition of the substance.
Formed when valence electrons are not associated with an atom or ion, but exist as a "cloud" of electrons around the ion centers.
Metallic bond
Are two atoms of the same element identical?
Yes.
Difference between melting and boiling point
Boiling point is higher because it needs more temperature to make the element boil.
2H2O2 = 2H2O + O2
Decomposition
Melting ice is:
Making ice is:
Endothermic
Exothermic
All elements are composed of atoms that can't be divided.
Dalton's Atomic Theory
Can one atom of an element be decomposed?
No.
Electron dot diagram of Nh
Define single and double replacement equations
When one element replaces another in a compound or when two elements in a different compound change places
Define endothermic and exothermic
Endothermic: absorbs energy in the form of heat.
Exothermic: releases energy in the form of heat.
Define the octet rule
Every atom prefers to have a complete outer shell of electrons, with eight electrons per shell, as this is a stable or low energy state.
Determines the ways in which the atom can bond with other atoms
A change in matter that produces one or more new substances.
Chemical change
Is this balanced?
Cr + O2 ------> Cr2O3
4Cr + 3O2 ------> 2Cr2O3
List the four types of chemical change
Form solid (precipitate)
Change in color
Change in texture
Production of gas bubbles