Chemical Reactions
One of the following is a chemical change, NOT a physical change: splitting wood, melting ice, burning wood or dissolving salt in water.
What is burning wood?
Rust forms when metal (iron/steel) comes into contact with water or moisture and oxygen.
What is a chemical reaction?
A substance that enters a chemical reaction is called this.
What is a reactant?
When a bath bomb enters water, it performs this action.
What is a reaction?
This type of change in a substance's appearance is not a chemical change and is usually reversible.
What is a physical change?
A rock with a mass of 128g and a volume of 32mL has a density of what?
4g/mL
This type of change occurs when a substance or multiple substances rearrange and a new substance is created.
What is a chemical change?
The original substance or substances in a chemical reaction are this.
What is a reactant(s)?
Give an example of a molecule?
H2O, H2, O2, N2
True or false: left over atoms from a previous reaction can make molecules of other left over atoms?
True
Gasoline, propane, kerosene, most cloth, wood, paper are examples.
What is flammable?
A new odor from a gallon of milk ... A color change that occurs when two clear liquids mix... Baking powder and water bubble and fizz...
What is a sign of a chemical reaction?
Cooking, precipitate forms, bubbles occur, formation of gases, temperature changes, corrosion, tarnishing are examples of this.
What are words to look for to determine if a chemical reaction occurs?
State the Law of Conservation of Mass.
What is "matter can not be created or destroyed in a chemical reaction"?
The atomic number of an element is its __________.
Number of Protons
True or False: all parts of a mixture are combined?
False
An increase in temperature will usually cause the rate of pressure to ________________.
What is increase?
In a closed system, there should be no change in...?
What is Mass?
The substance or substances that form in a chemical reaction are this.
What is a product(s)?
Give three examples that a chemical change has taken place.
What is temp. change, color change, odor change, formation of a precipitate, formation of a gas?
Color, texture, bending, tearing, melting, boiling, dissolving are all examples of this.
What are words that indicate physical changes?
The type of energy that a particle has when it is in motion
What is kinetic energy?
The process in which the building blocks of matter (atoms) are rearranged to produce different substances.
What is the definition of a chemical reaction?
Baking soda and vinegar react creating...
What is a new substance?