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