WorksheetsMidTerm Exam Review -- Elements, Compounds, and Mixtures
Total questions: 30
Worksheet time: 20mins
What is the smallest particle of a element?
compound
molecule
atom
mixture
Which substance is a mixture?
Y
Y and Z
neither Y or Z
Z
Carbon dioxide is a _____________ made up of two oxygen atoms and one carbon atom that are chemically bonded together.
compound
element
mixture
atom
The element oxygen, represented by the symbol O, is classified as
compound
solution
pure substance
mixture
In the diagram below, letter C is pointing to a ____________________
electron
neutron
proton
nucleus
How many protons are in an atom of Calcium?
20
40
40.078
60.078
Which of the following diagrams represents a molecule of the same element?
a
b
c
d
Which of the following diagrams represents a mixture?
a
b
c
d
Which of the following diagrams represents an element?
a
b
c
d
Which two subatomic particles are found in the nucleus of an atom?
protons and electrons
electrons and neutrons
protons and neutrons
Only the neutrons
Leslie adds a spoonful of baking soda to some vinegar. Bubbles begin to form as carbon dioxide gas is released. Carbon dioxide is a ___________.
compound
element
atom
mixture
Percy dissolves salt in a glass of water. Now it's salt water, which is an example of a(n) __________
element
compound
atom
mixture
Two __________ of sodium combine with one molecule of chlorine to form the compound sodium chloride
atoms
compounds
molecules
protons
The following picture shows a mixture of candies. What defines a mixture?
created through a chemical reaction
can be easily separated by physical means
described by a chemical formula
cannot be separated into simpler substances
Which of the following is true about compounds and elements?
The properties of a compound are DIFFERENT than the properties of its elements
The properties of a compound are the SAME as the properties of its elements
Compounds make up different elements.
Compounds are not related to elements
One atom of carbon combines with one molecule of oxygen to form the __________ carbon dioxide.
atom
element
compound
nucleus
Which of the following is an example of a pure substance?
Hydrogen (H)
Sodium Chloride (NaCl)
Pure water (H2O)
All of the above
Which of the following is an example of a mixture?
water
the atmosphere
calcium (Ca)
Carbon Monoxide (CO)
A substance has some particles that melt at 50 degrees Celsius and other particles that melt at 110 degrees Celsius. What must be true about the solid?
The solid is a mixture
The solid is a pure substance
The solid is an element
The solid has 3 boiling points
Sam's mother is cooking breakfast in a cast-iron frying pan. If the pan is made only of iron, what can Sam conclude?
The pan is a pure substance with the chemical symbol Ir.
The pan is a pure substance with the chemical symbol I.
The pan is a pure substance with the chemical symbol F.
The pan is a pure substance with the chemical symbol Fe.
