Atomic Structure
What particle has a positive charge and is found in the nucleus?
Proton
Is melting ice a physical or chemical change?
Physical change
What is the name of NaCl?
Sodium chloride
Two elements combine to make one compound. What type of reaction is this
Synthesis
What is the coefficient in front of H₂ in: 2H₂ + O₂ → 2H₂O?
2
What particle has no charge?
Neutron
Rusting iron is what type of change?
Chemical change
What is the formula for water?
H₂O
One compound breaks apart into simpler substances. What type of reaction is this?
Decomposition
Is this equation balanced?
H₂ + O₂ → H₂O
No
What particle moves around the outside of the nucleus?
Electron
Name one sign that a chemical reaction has occurred.
Color change, gas produced, temperature change, precipitate forms, light produced
What is the name of CO₂?
Carbon dioxide
A metal replaces another metal in a compound. What type of reaction is this?
Single replacement
How many oxygen atoms are in 3O₂?
6 oxygen atoms
What determines the identity of an element?
Number of protons
Is tearing paper a physical or chemical change?
Physical change
What is the formula for magnesium oxide?
MgO
Two compounds swap ions. What type of reaction is this?
Double replacement
Balance this equation:
__ H₂ + __ O₂ → __ H₂O
2H₂ + O₂ → 2H₂O
How do you find the number of neutrons in an atom?
Mass number − atomic number
Burning wood is what type of change?
Chemical change
What is the name of CaBr₂?
Calcium bromide
A hydrocarbon reacts with oxygen and produces CO₂ and H₂O. What type of reaction is this?
Combustion
Balance this equation:
__ Na + __ Cl₂ → __ NaCl
2Na + Cl₂ → 2NaCl