Chemical Change
Chemical Reactions
Energy
Balancing Chemical Equations
Bonds
200

These are the two types of changes that can occur in matter.

What are physical and chemical changes?

200

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?

200
A reaction that releases energy is called this.
What is exothermic?
200
These may not be changed when balancing chemical equations.
What are subscripts?
200

When a metal bonds with a nonmetal, this type of bond is formed.

What is an ionic bond.

400

One of the following is NOT a physical change: splitting wood, melting ice, burning wood or dissolving salt in water.

What is burning wood

400

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

400
Baking soda and vinegar combined results in this type of chemical reaction.
What is endothermic?
400
You can balance chemical equations by changing these.
What are coefficients?
400

When nonmetal bonds with another nonmetal this type of bond is formed.

What is a covalent bond.

600
This is what occurs between atoms when a chemical change takes place.
What is bonds break and new bonds form?
600

Chemical equations use these instead of words to summarize a reaction.

What are chemical formulas

600

Every chemical reaction needs this to get started.

What is activation energy.

600

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.

600

This kind of bond shares electrons

What is a covalent bond?

800
This is the ONLY sure evidence for a chemical reaction.
What is the production of a new substance?
800

This type of metal can have more than one charge when it forms an ion

What is multivalent

800

The baking of bread may be described as being this type of chemical reaction.

What is endothermic (it is absorbing heat from its environment).

800
In the formula 5CaSO4, this is the number of oxygen atoms.
What is 20?
800

In an ionic bond, this kind of atom gives up electrons.

What is a metal.

1000

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

1000

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.

1000

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.

1000

Balance Fe + H20 = Fe2O3 + H2

2Fe + H20 = Fe2O3 + 3H2

1000

Name the molecular compound of NO2

What is Nitrogen Dioxide.