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Chemistry Unit

Chapters 3 and 4

What do we call the elements in group 18? Noble Gases
Why are metalloids sometimes referred to as "semiconductors?" Semiconductors can conduct electric current under some conditions, but not under other conditions
What category in the periodic table have properties of both metals and nonmetals? metalloids
What is the chemical symbol for potassium? K
How many letters can a chemical symbol have? 1 or 2
Are groups horizontal or vertical? vertical
Which category on the periodic table is the biggest? (metals, nonmetals, metalloids) Metals
How do atoms combine to form compounds? gain, lose, or share electrons
What do we call the electrons in the outermost energy level that have the highest amount of energy? Valence Electons
What do we call the symbol of an element surrounded by dots that represent valence electrons? Electron dot diagram
What is the force of attraction that holds atoms together as a result of the rearrangement of electrons between them? Chemical Bond
How did Mendeleev arrange his periodic table? Increasing atomic mass
What means "in a regular, repeated pattern?" periodic
How is the modern periodic table arranged? In order of increasing atomic number
The following are properties of ____________. Poor conductors of heat and electricity, dull, brittle nonmetals
Elements are classified according to ________________. their properties
Name some physical properties of metals. malleable, ductile, good conductors of heat and electricity
What is the smallest particle that can still be an element? atom
What is a negatively charged particle called? electron
What is a positively charged particle proton
Where are electrons found? Electron cloud
What subatomic particle has no charge? neutron
The number of protons in the nucleus of an atom is the __________________. atomic number
If two atoms have the same number of protons, but different numbers of neutrons are known as _______________. isotopes
What is a column on the periodic table called? Group
What is a row on the periodic table called? Period
How can the properties of an element be predicted? From its location on the periodic table
Would elements in the same period or the same group have similar characteristics? Same group
Where are the alkaline earth metals located on the periodic table? Group 2
What group of metals are the most reactive Alkali Metals
What category of elements are poor conductors of electric current and heat? nonmetals
What states that matter can neither be created or destroyed? The law of conservation of mass
When is the law of conservation of mass true? ALWAYS--you just can't measure it in an open system because there is an exchange
Tearing a piece of paper is an example of which type of change? physical
Changes of state (ex. melting) are which type of change? physical
Burning is and example of which type of change? chemical
Which type of reaction absorbs heat? endothermic
Which type of reaction releases heat exothermic
What do we call the elements/compounds located on the left side of a chemical equation? reactants
What do we call the elements/compounds located on the right side of a chemical equation? products
Which type of reaction would show reactant breaking down into 2 or more products? decomposition
Which type of reaction would show 2 or more reactants forming one product? synthesis
What is the chemical symbol for magnesium? Mg
What is the best evidence a chemical reaction has occurred? One or more new substances are formed
If Calcium is in group 2, how many valence electrons will it have? 2
Created by: MrsMonagle



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