PC1.1 Review and Practice - Clare Peters-Libeu | Library

8

In each region of the periodic table, place the correct description of the elements near the label.

Match the definitions with the vocabulary term.

Draggable item		Corresponding Item
diatomic		Precipitate
chemical formula		smallest repeating group of atoms in a compound
coefficient		describes the ratio of a particular element in the compound or molecule to the other elements
mixture		the number of formula units in a collection of atoms
molecule		a chemical symbol that describes the number of atoms of each element in a group of atoms
compound		elements that always are found as a group of two atoms
subscript		elements that can be found as a single atom
monoatomic		how or whether a substance reacts with another substance
Formula Unit		anything that you can measure to characterize a substance
alloy		when more than one compound is present
physical property		two or more elements in a specific ratio
Solid that appears in liquid during a chemical reaction		one or more nonmetal elements in a specific ratio
chemical property		a group of atoms with the same chemical properties
element		two or more metal atoms in a specific ratio

10

Decide whether each picture represents an element, a compound and or a molecule. Be sure to use your periodic table to determine whether collections of atoms has metallic or nonmetal elements in it. There are pictures that can go in multiple categories.

Element
Compound
Molecule
Alloy

In the questions, below use the math editor to type in the number of atoms (for example -2) or the equation using the coefficients and subscripts to is used to calculate the total number of atoms in the group ( for example - 6x2=12).

4

Hg₇O₄ means that for every _______ mercury atoms, there are _______ oxygen atoms. The total number of mercury atoms in the group is _______ and the total number of oxygen atoms is _______ .

4

6Au₂S₃ means that for every _______ gold atoms, there are _______ sulfur atoms. The total number of gold atoms in the group is _______ and the total number of sulfur atoms is _______ .

4

9Pb₅Cl₇ means that for every _______ lead atoms, there are _______ chlorine atoms. The total number of lead atoms in the group is _______ and the total number of chlorine atoms is _______ .

4

 3Ag₄C means that for every _______ silver atoms, there are _______ carbon atoms. The total number of silver atoms in the group is _______ and the total number of carbon atoms is _______ .

6

Match the diagram with the correct formula unit. The formula unit is sometimes known as the empirical formula since it reflects the ratios of the atoms of each element in the sample. Empirical in this case means something measured.

Draggable item		Corresponding Item
		CH₃O
		C₂H₅O₂
		C₃H₅O₃

8

Match the diagram with the correct chemical formula for each group of atoms.

Draggable item		Corresponding Item
		3Fe₂O₆H₃
		12Fe₃O₂H₃
		4Fe₃O₆H₂
		8Fe₂O₄H₃