Which of the following groups represent 4 classes of matter, as they are classified according to their makeup?
D) elements compounds, mixtures, solutions
Substances form a mixture when they are
B) physically combined
A compound is a pure substance because it
A) is one kind of material with definite properties
An example of a pure substance is
C) gold
The simplest type of pure substance is
C) an element
Atom is to element as molecule is to
B) compound
Which of the following lists is arranged from the least complex to the most complex calss of matter?
C) element, compound, mixture
The largest particles can be found in
A) a heterogeneous mixture
An example of a homogeneous mixture is
A) salt water
An example of a heterogeneous mixture is
B) Italian salad dressing
The building blocks of matter are
C) atoms
An alloy is a
A) solution of metals
A glass of pure water is all of the following EXCEPT
D) an element
Compounds are
C) made of more than one element chemically combined
All of the following are physical properties EXCEPT
B) ability to burn
A shorthand way of representing an element is by
A) writing a chemical symbol
Oxygen, represented as O2, is
B) a molecule of oxygen
The number that tells how many atoms of an element are in a compound is called a
B) subscript number
One molecule of H2SO4 contains
A) 2 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
The description of a chemical reaction using symbols and formulas is called a
C) chemical equation
Which of the following is properly balanced?
C) H2 + Cl2 --> 2HCl
A mixture of oil and water can best be separated by considering the property of
C) density
An equation is balanced, by placing the appropriate number in front of a chemical symbol or formula. This number would change the number of molecules. It is called a
C) coefficient
Using activated charcoal to remove red food coloring or other impurities dissolved in water is an example of
D) a physical process used to separate a homogeneous mixture
Heterogeneous mixtures can be physically separated easily compared to solutions because
B) the particles of a solution are much smaller than those in a heterogeneous mixture
Which of the following statements is true when an element has a two letter symbol?
A) The first letter is upper case and the second is lower case.
The relative proportions of substances can NOT vary in
B) a compound
Compounds are represented by
A) a chemical formula
Compounds are different from mixtures in that
A) compounds are chemically combined and mixtures are not
There are _________ naturally occurring elements.
92
When making lemonade using a powder mix, the water is the ________, substance doing the dissolving.
solvent
When making lemonade using a powder mix, the lemonade powder mix is the _______, substance being dissolved.
solute
The shorthand representation for many elements on the periodic table does not seem to match the element's name. This is because the shorthand representation often comes from the _____ language
