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WorksheetsChemistry Pretest/Post-test
Total questions: 25
Worksheet time: 13mins
An educated guess is a __________________.
discussion
conclusion
hypothesis
data
The factor that you change in an experiment is ______________.
control
independent variable
dependent variable
constant
The factors you keep the same in an experiment are the ____________________.
independent variable
control
constant
dependent variable
Matter is all around us.
True
False
Which of the following is NOT a physical property of matter?
solubility
boiling point
conductivity
burning
Boiling point is the temperature when ________________.
A substance changes from liquid to gas.
A substance changes from gas to liquid.
A substance changes from a solid to a liquid.
A substance changes from a solid to a gas.
Two examples of chemical properties.
density and hardness
reactivity and flammability
conductivity and boiling point
viscosity and solubility
While roasting a marshmallow, it catches on fire and changes dramatically. This demonstrates
melting point
reactivity
viscosity
flammability
Sugar is dissolved in water. This demonstrates the property of _____________________.
viscosity
solubility
flammability
malleability
Who is considered to be the first real chemist and lived in the 1600s?
John Dalton
Robert Boyle
Dmitri Mendeleev
Michael Faraday
Which one of these are examples of chemical changes?
grinding a substance into smaller parts
boiling water
mixing flour and water to make dough
roasting a marshmallow
Which is the most common form of matter?
liquid
gas
solid
plasma
Who was considered to be the father of modern chemistry?
John Dalton
Robert Boyle
Dmitri Mendeleev
Antoine Lavoisier
Alchemists tried to make metals, such as lead and iron, into _____________________.
gold
silver
aluminum
copper
Who introduced a system of abbreviations for the elements on the current periodic table?
Robert Boyle
Sir Isaac Newton
Jon Berzelius
Alfred Nobel
This chemist received the Nobel Prize for their discovery of radium and polonium.
Marie Curie
John Dalton
Louis Pasteur
Antoine Lavoisier
This chemist is credited for discovering oxygen and inventing "soda water."
Otto Hahn
Joseph Priestley
Louis Pasteur
Humphry Davy
Which of these statements is true about compouds?
They are not chemically combined.
They can be separated by physical methods.
They contain two or more elements.
The amounts of elements will vary.
What does pH stands for?
Power of Hydrogen
Pure Hydrogen
Power of Helium
Pure Helium
The human body has about ________________ chemical reactions per second.
100 million
10 thousand
400 billion
5 billion
What has the power to eat rust and make carbonated drinks taste good?
sodium chloride
carbon dioxide
sulfuric acid
phosphoric acid
Chains of small molecules are called ___________________.
carbon
polymers
nanoparticles
ions
What are the basic units of matter?
molecules
protons
atoms
nucleus
A gas can transform directly into a solid.
True
False
How many confirmed elements are on the periodic table?
100
118
125
131
