topic 2 lesson 3 Flashcards
what three things does a chemical equation tell you
compounds/ molecule involved, the element in the compounds, recants and products
a chemical formula combines the _____ of different elements to represent _________
symbol; compound molecules
what does the 2 represent in H20?
how many atoms are in the molecule
what does it mean when there is no subscript
there is only one atom
a chemical equation indicates the substances involved in a reaction
reactant
a substance that are formed as a result of the reaction
product
reactants are found on the (left/right)
and the product are found on the (left/right)
left, right
what symbol joins the reactants and the products?
an arrow
The number that appears in front of a molecule is called the ________ , and it shows ___ _____ of a reactant is needed to produce a specific product
coefficient; how much
does a heat source like a flame count as one of the reactants
no
only the substance that are _____ _________ in the reaction are shown in the equation
chemically arranged
matter is neither _________ nor _________
created; destroyed
in chemical reactions, the mass of the reactants ________ the mass of the products
equal
when you have too much of one reactant, you can have _________ reactants that did not chemcially react. But again the mass will not have changed
leftover
However the products have very different _______
properties
An open system, like plants, appears to violate the Laws of Conservation of Mass, but that’s because matter can _______ and ______ they system undetected.
enter; escape
which type of system is perferred by studying?
closed
there are _ different types of chemical reaction
3
two or more elements or compound ______ to make a more complex substance
combined
when one element or compound replace another two element ________________
trade places
compounds break down into a similar
products
