WorksheetsElements
Total questions: 12
Worksheet time: 6mins
Pure substances are
alloys and can be represented by one chemical symbol
elements and can be represented by one chemical symbol
mixtures and can be represented by two or more chemical symbols.
solutions and can be represented by two or more chemical symbols.
Each component in a mixture
retains all of its original properties.
adopts the properties of the mixture.
can have completely different properties once mixed.
transfers some of its properties to other components.
In science lab, Ellie combined sugar and distilled water. Ellie made
a mixture, which must be separated by chemical processes
a compound, which must be separated by chemical processes.
a mixture, which can be separated through physical processes.
a compound, which can be separated through physical processes.
A pure substance which can only be separated into two or more simpler substances using chemical changes is called
an element
a compound
a mixture
an atom
The information on the element tile on the periodic table which represents the total number of protons and neutrons in an atom is called the
Atomic Number
Atomic Mass
Proton Number
Weight Number
Salt solution , Frozen yogurt , Copper penny , Baking powder. What do they all have in common?
They are all made of atoms
They are in the same state of matter.
They have the same chemical properties.
They have the same physical properties.
James discovered that sodium (Na) is found in Group 1, Period 3 on the periodic table. Where should Marcus look to find another element that has similar properties to those of sodium?
in Group 1
in Period 3
on the opposite side of the periodic table
at elements whose symbols begin with the letter N
Differences between a molecule and an atom
atom is a combination of two or more molecules, while a molecule is the smallest unit of an element
an atom is a combination of two or more elements, while a molecule is the smallest unit of an atom
an atom is the smallest unit of a molecule, while a molecule is a combination of two or more elements
an atom is the smallest unit of an element, while a molecule is a combination of two or more atoms
Most of the elements on the periodic table are
Metals
Metalloids
Nonmetals
Gasses
Which are pure substances?
A and B
C and D
A and C
B and D
A sample substance has the chemical formula: H2CO3. One molecule of the sample contains
two different elements with atomic numbers 1 and 27
two different elements with atomic numbers 2 and 29.
three different elements with atomic numbers 1, 6, and 8.
three different elements with atomic numbers 2, 8, and 20.
Which container holds a sample of a mixture?
Container A
Container B
Container C
none of the container holds a sample of a mixture
