Vocabulary
Physical and Chemical
Chemical Reactions
Random
A+
200
The tiny pieces that all matter is made of.
Atoms
200
Gas production is an indication that a ______ change is occuring.
Chemical
200
These substances will have __________ properties.
different
200
_____________ reactions release stored energy.
Exothermic
200
The diagram shows the repeating groups of atoms that make up two samples. The properties will be ________ because ________.
different; the molecules are made of different types of atoms
400
An ending substance that is made during a chemical reaction.
Product
400
The color of a substance is a _________ property.
physical
400
_____________ reactions absorb energy (heat)
Endothermic
400
Can substances change into different substances?
yes, because atoms can be rearranged to form different substances
400
Mr. Cosgrove mixed two samples together: a gray solid that smells like flowers and a gray solid that smells like bleach. He analyzed the results and found two ending substances. One of the ending substances (shown in diagram) was a white solid, made up of the repeating group of atoms shown above. Which of the diagrams shows the repeating groups of atoms that make up the reactants?
D
600
Something that can be observed about a substance, such as color, smell or boiling point.
Property
600
During a chemical reaction a ____ substance is formed.
new
600
In this chemical equation, which is one of the products? 
Water
Carbon Dioxide
600
In the reaction shown, hydrogen and oxygen are the _______.
Reactants
600
Ms. Schoolcraft is a chemist who is making a chemical to add to swimming pools in order to make the water safer. She mixed two solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances. After mixing, Ms. Schoolcraft found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the right shows the repeating groups of atoms that make up the products?
c
800
a group of atoms bonded together
(aka a repeating atom group)
Molecule
800
A change is state (solid, liquid, gas) is a _______ change.
physical
800
These substances have the exact same properties. True or False?
False
800
What is a possible product these reactants can form?
red, orange
blue, black
red, black
blue, orange
800
During a chemical reaction, atoms cannot be ______ or ______.
Created or destroyed
1000
A process in which atoms rearrange to form new substances
Chemical Reaction
1000
This type of change is usually very difficult to reverse.
Chemical Change
1000
In this reaction, how many hydrogen and oxygen are in the reactants?
4 Hydrogen and 2 Oxygen
1000
During a chemical reaction, ______ of the atoms that make up the reactants rearrange to form the products.
All
1000
devorah is a food chemist, and she is developing a chemical to help foods stay fresh longer. She mixed a red liquid substance and a colorless solid substance together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.
After mixing, Devorah found two white substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?
C