These are the two types of changes that can occur in matter.
What are physical and chemical changes?
These are substances you have at the beginning of a chemical reaction and are listed on the left hand side of the arrow of a chemical equation.
What are reactants?
When a metal bonds with a nonmetal, this type of bond is formed.
What is an ionic bond.
One of the following is NOT a physical change: splitting wood, melting ice, burning wood or dissolving salt in water.
What is burning wood
According to this law, matter is neither created nor destroyed during the reaction, and the total mass of the reactants must equal that of the products.
What is the law of conservation of mass
When nonmetal bonds with another nonmetal this type of bond is formed.
What is a covalent bond.
Chemical equations use these instead of words to summarize a reaction.
What are chemical formulas
Every chemical reaction needs this to get started.
What is activation energy.
Why is it necessary to balance chemical equations?
What is the principle of conservation of mass. In a chemical reaction, the total mass of the reactants must equal the total mass of the products.
This kind of bond shares electrons
What is a covalent bond?
This type of metal can have more than one charge when it forms an ion
What is multivalent
The baking of bread may be described as being this type of chemical reaction.
What is endothermic (it is absorbing heat from its environment).
In an ionic bond, this kind of atom gives up electrons.
What is a metal.
Give three examples that a chemical change has taken place.
What are a change in temperature change, color, or change, formation of a precipitate, and/or formation of a gas
How does the law of conservation of mass apply to a burning candle?
When a candle burns, the wax and oxygen react to form carbon dioxide and water vapor, but the total mass of the wax, oxygen, carbon dioxide, and water vapor remains constant, demonstrating the law of conservation of mass.
The law of conservation of energy describes what
What is the total energy in a closed system remains constant over time; it can neither be created nor destroyed, only transferred or converted from one form to another.
Balance Fe + H20 = Fe2O3 + H2
2Fe + 3 H20 = Fe2O3 + 3H2
Name the molecular compound of NO2
What is Nitrogen Dioxide.