Balance Equation
What is 2, 2, 1, 1
Ionic bonds are strong enough to cause almost all ionic compounds to be __________ at room temperature.
solids
Freezig point is
What is a chemical property
What happens when chemical bonds break and new bonds form?
chemical change
CaCo3 is a
What is a formula
____CH4 + ____O2 ---> ____CO2 + ______ H2O
What is 1, 2, 1, 2
When an atom loses an electron, it becomes a
positive ion
Rusting
What is 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
what is 15
_____ N2O5 ---> ___N2 + ____O2
What is 2, 2, 5
What does the dot represent in the lewis dot diagram
valance electron
What happens when chemical bonds break and new bonds form?
chemical change
An atom that loses a valence electron becomes a _____________ ion. An atom that gains a valence electron becomes a _____________ ion.
Positive; negative
Which thype of element would be the most stable
What is noble gases
C5H12 + O2 ---> CO2 + H2O
What is 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?
systhesis
Matter can not be created nor destory
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
gas production
What type of reaction is FeS + 2 HCl ---> FeCl2 + H2S?
double replacement
The substances listed on the left side of a chemical equation are the
reactants