Balance The Equation
__Al + __CuO --> __Al2O3 + __Cu
2, 2, 1, 1
Ionic bonds are strong enough to cause almost all ionic compounds to be __________ at room temperature.
solids
Freezing point is
a physical property
What happens when chemical bonds break and new bonds form?
chemical change
CaCO3 is a
a chemical formula
__CH4 + __O2 ---> __CO2 + __H2O
1, 2, 1, 2
When an atom loses an electron, it becomes a
positive ion
Rusting
a chemical change
A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a
chemical equation
Ca(C2H3O2)2 has ______ atoms
15
__N2O5 ---> __N2 + __O2
2, 2, 5
What does the dots represent in the lewis dot diagram
the valance electrons
What happens when chemical bonds break and new bonds form?
a chemical change
An atom that loses a valence electron becomes a _____________ ion.
Positive
Which type of element would be the most stable
noble gases
__C5H12 + __O2 ---> __CO2 + __H2O
1, 8, 5, 6
What holds the atoms in a covalent bond together?
The attraction between the shared electrons and the protons in each atom's nucleus
What is the only definite evidence that a chemical reaction has happened?
production of a new substance
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
decomposition reaction
The elements iron and oxygen can react to form the compound iron oxide. What type of reaction is this?
synthesis
Matter can not be created nor destroyed
Law of Conservation of matter
To form a covalent bond you need what
two non-metal that share electrons
A change in which of the properties is most likely to indicate a chemical change?
color change, odor, heat released or absorded, solid formed, and gas production
What type of reaction is FeS + 2HCl ---> FeCl2 + H2S?
double replacement
The substances listed on the left side of a chemical equation are the
reactants