pH Scale
What numbers does the pH scale span?
0-14
Name 3 signs of a chemical reaction
gas released, change of energy, change of color
What is a radioactive element?
Unstable element whose nucleus breaks down
Acids’ pH’s fall between what two numbers?
0-7
What is the Law of Conservation of Matter?
Matter cannot be created or destroyed by a chemical change
Radioactive elements have what atomic numbers?
83 or greater
Bases’ pH’s fall between what two numbers?
What 3 elements are in a combustion reaction?
Carbon, hydrogen, oxygen
What is an isotope?
Atoms of an element with the same number of protons but a different number of neutrons
What ions are formed in acids?
Hydrogen
What happens in a synthesis reaction?
Two simple compounds combine to form a more complex compound
What is nuclear fission?
nucleus splits into smaller nuclei and energy is released
What ions are formed in bases?
Hydroxide
What happens in a decomposition reaction?
A compound breaks down into 2 simpler compounds
What is nuclear fusion?
two smaller nuclei are joined to form a larger nucleus