Changes
Tearing a piece of paper is an example of this.
What is a physical change?
All elements are identified by the number of these.
What are protons?
This is 2 or more elements chemically combined.
What is a compound?
The majority of the periodic table falls into this classification.
What are metals?
The Law of Conservation of Mass states this.
What is mass cannot be created or destroyed?
A change in the state of matter is this type of change.
What is physical?
These two subatomic particles make up the atomic mass of an element
What are protons and neutrons?
This is 2 or more elements or compounds that can be separated physically.
What is a mixture?
Elements on the periodic table with similar properties are organized into these.
What are groups?
This is the name given to the elements or compounds found on the left side of a chemical equation.
What are reactants?
This is how a burning candle exhibits both a physical and chemical change.
What is wax melting (physical) and the wick burning (chemical)?
In a neutral atom, the number of these are equal to the number of protons.
What are electrons?
A chocolate chip cookie and chicken noodle soup are examples of this.
What is a heterogeneous mixture.
This is the name given to groups 3 - 12 on the periodic table.
What are the transition metals?
The mass, number of atoms, and number of elements must be this in a balanced chemical equation.
What is the same or equal?
These are 3 signs that a chemical change has taken place.
What are:
Odor
formation of gas
formation of precipitate
color change
new substance formed
An element's reactivity is determined by the number of these.
What are valence electrons?
This is a liquid mixture that appears to be a single substance.
What is a solution?
The most reactive metals are located in this corner of the periodic table.
What is the bottom left corner?
Only in this scenario would the mass of your products be less than the mass of your reactants in a chemical reaction.
What is the system was not closed, OR it was an open system?
The first type of reaction releases heat (warms) and the second type of reaction absorbs heat (cools).
What is exothermic and endothermic?
In order, the first three electrons shells for elements 1 - 20, hold this many number of electrons.
What is 2, 8, and 8
The chemical formula C6H12O6 represents what compound?
What is sugar (glucose)?
This is a unique property of Group 18.
What is they have a full valence electron shell OR they are nonreactive?
Of the following chemical equations, THIS is the one that is balanced.
A. HNO3+2NaHCO3 --> NaNO3 +H2O + CO2
B. SiO2 + 6HF --> SiF4 + 2H2O
C. 2NaBr + CaF2 --> 2NaF + CaBr2
D. C2H4O2 + O2 --> CO2 + H2O
What is C?