Science Ch. 9 Flashcards
True or False: A chemical reaction in which more energy is absorbed than released is endothermic
True
True or False: Activation energy is the minimum amount of energy needed for a chemical reaction
True
Define endothermic
A chemical or physical process that absorbs heat from its surroundings. Basically endo=in
Define exothermic
A chemical reaction that releases energy, often in the form of heat. Basically exo=out
According to the law of conservation of mass, can three atoms of calcium react to produce six atoms of calcium?
No
Define Catalyst
A substance that speeds up a chemical reaction without being consumed in the process. They lower the activation point.
Can chemical equations be balanced by changing the subscripts of molecules?
No
When a chemical equation contains the same number of atoms, on both sides of the reaction, is the equation balanced??
Yes
True or False: The formation of bubbles is a good way to determine if a chemical reaction has taken place
True
True or False: In an endo reaction, the energy of the products will be less than the energy of the reactants because some energy is lost to the environment (light and heat)
False
Define Precipitate
A solid that forms during a chemical reaction
True or False: Your body can take simple digested compounds (amino acids) and bind them into larger compounds (proteins) through synthesis withing cells
True
Each substance on the left side of the arrow in a chemical equation is a
Reactant
The burning gasoline in a car is an example of
Exothermic Reaction
Define decomposition
The breaking down of a substance into two or more simpler substances (AB=A+B)
