Periodic Table
Periodic Trends
Chemical Equations
Reactions
Key Terms
100
What number tells you the number of protons and electrons?
Atomic Number
100

Where are protons located?

Nucleus

100

Ending materials in a chemical equation?

Products

100

Chemical reaction that releases energy? 

Exothermic 

100

Anything that has mass and takes up space? 

Matter 

200
How do you figure out the number of neutrons?
Subtract the atomic number from the atomic mass
200
What subatomic particle is not inside the nucleus?
Electrons
200

You can only change this when balancing chemical equations? 

Coefficients 

200

Chemical reaction that absorbs energy? 

Endothermic
200

Building blocks of matter; smallest piece of an element that still represents that element?

Atom
300
How do you find an element's atomic mass?
Add the number of neutrons and the number of protons together
300
What particle has no charge?
Neutron
300

Starting materials in a chemical equation ? 

Reactants
300

For a chemical reaction in a closed system, mass cannot be _________ or _______. We can say that throughout the reaction mass is ______.

created; destroyed; conserved

300

A pure substance only made up of one kind of atom?

Element

400

Why are elements organized into families?

because they have similar properties

400
What particle has a negative charge?
Electron
400
A chemical change occurs when ______ properties of a substance change and its _____ changes 

physical properties and identity (becomes a different material) 

400

A pure substance that cannot be broken down into other substances by chemical or physical means. 

Element

400

A substance made up of atoms of 2 or more elements joined by chemical bonds? 

Compound 

(Water - H20) 

(Table Salt-  NaCl)

500
What does the term 'valence electrons' mean? (2 things)
number of electrons on outermost shell, tells how reactive an element is
500

How many periods does the periodic table contain? 

7

500

How does the law of conservation of matter apply to chemical equations? 

Having the same number and type of atoms on both sides of the equation

500

Why is dissolving salt a physical change and not chemical ? 

The salt is still there, it is just dissolved. 

500
A combination of 2 or more substances that are NOT chemically bonded together? 

mixture (lucky charms) 

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