Chemical Reactions
These include bubbles, unexpected color change, light, temperature change, sound, and a precipitate.
What is a sign/indicator that a chemical reaction has occurred?
Salt can ______________ in water when mixed together.
An equation that represents a chemical reaction
What is a chemical equation?
A chemical equation is ______________ when the atoms on both sides of the equation are equal.
What is balanced?
The basic unit of a chemical element.
What is an atom?
All chemical changes or chemical reactions include the production of this
A new substance or product
What is change in shape and size?
Compounds in a reaction on the left side of the arrow are the ________, on the right side of the arrow they are called the ________.
Reactants, products.
A scientific statement about making sure that chemical reactions begin and end with the same amount of stuff.
Law of Conservation of Matter
A substance formed when two or more chemical elements are bonded together.
molecule
The name given to the substances present at the beginning of a chemical reaction
What are reactants?
Boiling water until it becomes water vapor is an example of this
What is a phase change or change of state?
The reactants in photosynthesis
water, carbon dioxide (and sunlight)
The numbers that we can add into equations at the start of chemical formulas are called?
Coefficients
States that mass can neither be created nor destroyed, therefore, the amount of matter or mass cannot change in a closed system.
What is the Law of Conservation of Matter/Mass
The name given to the substances present at the end of a chemical reaction
What are products?
The name of the change when water vapor or steam turns into liquid on grass in the morning.
Condensation
How many potassium, oxygen and hydrogen atoms, respectively, there are on the product side.
2 K (s) + 2 H2O (l) → 2 KOH (aq) + H2 (g)
2, 2, 4
A reaction in which a compound breaks down into two or more simpler substances.
What is decomposition?
A chemical reaction you learned about in 7th grade that includes the products glucose and oxygen.
What is photosynthesis?
All 4 states of matter
What are solid, liquid, gas, and plasma?
Two major things that symbol equations provide that word equations don't?
Number of atoms & states of matter
Balance this equation?
N2 + H2 -> NH3
N2 + 3H2 -> 2NH3
List the 3 states of matter in order from the lowest to the highest energy level.
What is solid, liquid, gas?