Chapter 17. Science
symbol for substance is dissolved in a solution
(aq)
symbol for substance is a gas
(g)
symbol for substance is a liquid
(l)
symbol for substance is a solid
(s)
6.02 x 10^23
1 Mole/ avogadro's number
5. What happens in a single displacement reaction?
1 element replaces a similar element in a compound
A mole of any substance is equal to
6.02 X 10 23
Combustion
A carbon compound id usually one of the the reactants in a__.
Formula
A compound is measured in amu's
Precipitate
A insoluble product in a double-displacement reaction is called a___
Polymerization
A large molecule of repeating units is made by the process of ___.
Chemical Reaction
A process that involves reactants and products.
Product
A substance that is the result of the forming of new bonds in a chemical reaction is called a___.
_______________ reactions occur when two or more substances are combined to form a new compound.
Addition reaction
Frying an egg in a pan causes a ____ change to the egg
Chemical
The action of enzymes on food during digestion results in a ___ change
Chemical
grams
Formula Mass
6. What happens in a double displacement reaction?
Ions from two compounds exchange places to produce 2 new compounds
amu
Moler mass
Both physical and chemical changes involve ______ reactions and energy
Physical
Crushing ice is an example of a ___ change.
Physical
Rolling out a lump of pizza dough into a pizza crust is an example of ____ Change
Physical
The evaporation of water is an example of a ____ change.
Physical
Reactant
Starting ingredient in a a chemical reaction is called a____
Law of Conservation of mass
States that the mass of reactants always equals the mass of the products .
Moler mass
The mass in grams of one mole of a substance.
Avogadro Number
The number of molecules in a mole is equal to ___.
Chemical Equation
The written form of a chemical reaction.
Mole
There are 6.02 x 10^23 atoms in a ___ of the element carbon.
Why is it useful to write chemical equations?
They are a convenient way to describe reactions
addition
Used to make a compound from other compounds or elements.
Decomposition
Water can be broken down into hydrogen gas and oxygen gas by a__.
coefficient
You can change the number of atoms in a chemical equation by placing a ___ in front of the chemical formula.
List evidence that a chemical reaction may have occurred.
bubbling, color change or clouding
List a few ways that would lead you to believe a chemical reaction had occurred.
bubbling, turns cloudy, color change
In one type of combustion reaction, ___________ is combined with oxygen to create heat and light.
carbon
Boiling water turns a raw egg into a hard boiled egg.
chemical reaction
When you mix baking soda and vinegar, carbon dioxide is released.
chemical reaction
Physical and chemical changes involve______________.
chemical reactions
When balancing a chemical equation you may only change the ________________, not the subscript.
coefficient
3. A ___________________ reaction breaks down compounds into two or more smaller compounds.
decomposition
4. In decomposition reactions, _____________ is required to begin the reaction.
energy
The_____________mass is the sum of the atomic mass units of all the atoms in a chemical formula.
formula
The statement,"the total mass of the products must equal the total mass of the reactants" is known as the __________________________________________.
law of conservation of mass
A loaf of freshly baked bread tastes better and looks much different than a lump of bread dough
physical reaction
Max divided cookie doughy into small piles on a cookie sheet.
physical reaction
You build a tall sand castle at the beach. After a wave washes over it, the sand castle turns in to a big pile of sand.
physical reaction
2. A special type of addition reaction that creates polymers is called ___________________.
polymerization
A chemica lreaction is the process of breaking molecular bonds and reforming them into a new ________________.
substances
What are products in a chemical reaction?
the outcome; new substance
What are reactants in a chemical reaction?
the starting ingredients
