Show:
Definition
True or False
physical and chemical changes
Key Concepts
Comprehension
100
what is an exothermic reaction
when energy is released, usually as heat
100
the basic structure of a chemical equation is a reactant + products -> product + reactant
false
100
changes in the states of matter , such as melting, freezing, and boiling, are also
What is physical change
100
what information does a chemical equation contain
a chemical equation tells you the substance you start with in a reaction or the reactants and the new substance that are formed at the end
100
why is it h2o instead of h2o2
because h2o2 is the formula for hydrogen peroxide , a completely different compound
200
the amount of a substance in the given volume
What is concentration
200
the cells in your body contain thousands of biological catalysts are called inhibitor
what is false
200
burning , and rusting are both _____________
What is chemical changes
200
changes in matter can be described in terms of what
physical changes and chemical changes
200
what are the four steps used to balanced chemical equation
write the equation, count the atoms, use coefficients to balance atoms, and look back and check
300
what is LCM or law of conservation of mass
the fact that matter is not created or destroyed in any chemical or physical change
300
inhibitors called preservatives are added to food to prevent spoiling
What is true
300
bending , crushing and cutting are all ___________
What is physical changes
300
how is mass conserved during chemical and physical changes
all the atoms present before a physical or chemical change are present after the change
300
what was Antoine Lavoiser known as the father of
he found modern chemistry
400
what is activation energy
the minimum amount of energy needed to start a chemical reaction
400
a chemical equation away to show a chemical reaction using symbols instead of words
What is true
400
a change in matter that produces one or more new substances is a ___________
What is chemical change
400
unlike a physical change what happens during the chemical change
a new substance is formed
400
can matter undergo both physical and chemical changes
What is yes
500
what is a product
a new substance that forms when a substance the undergoes the chemical change
500
Catalyst is the minimum amount of energy needed to start a chemical reaction
What is false
500
a _________ is a solid that forms from liquids during a __________
What is precipitate and chemical reaction
500
how do reactions get started
all chemical reactions need a certain amount of activation energy to get started
500
can atoms be destroyed
no