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WorksheetsSpiral Review
Total questions: 68
Worksheet time: 1hrs 1mins
Where is most of an atom's mass located at?
neutron
electron cloud
nucleus
proton
The positive particles of an atom are
Electrons
Positrons
Neutrons
Protons
What does the 1.00794 stand for?
Hydrogen
atomic number
atomic mass
atomic explosion
Taste bitter
acids
bases
neutral
pH paper
Taste sour
acids
bases
neutral
pH scale
CsOH is classified as a:
strong acid
weak acid
strong base
weak base
What is the only substance with a neutral pH of 7?
Milk
Orange Juice
Pure Water
Blood
All Water
In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?
Both of the solution are bases
Both of the solution are acids
The Baking soda is an acid and the Bleach is a base
The baking soda is a base and the Bleach is an acid.
Water has a neutral because
it has more H+ ions than OH-
it has more OH- ions than H+
it does not produce any ions
it has an equal amount of H+ and OH- in solution
A chemical has a pH = 6. It would be best described as
Strong acid
Strong base
Weak acid
Weak base
Substances like dark chocolate that have a bitter taste, usually indicates that it would be classified as a
Acids
Bases
Salts
All
Which best describes the act of using senses or tools to gather information?
creating a hypothesis
making an observation
summarizing the results
recording the measurements
Which best describes the purpose of a control sample?
to compare its results to those of a well-known scientist
to have more qualitative data to analyze at the end of the experiment
to compare its results to those with the experimental sample
In an investigation that uses the scientific method, which step immediately follows making a hypothesis?
test your hypothesis
summarizing the results
making observations
asking a question
Constants are factors in an experiment that stay the same. True or False?
True
False
What should an experimenter do after analyzing data?
carry out the experiment
draw conclusions
observe and infer
identify the problem
A statement that can be tested or is an educated guess is known as what?
control
observation
independent variable
hypothesis
Which best describes the purpose of a controlled experiment?
to prevent an undesired change in a variable
to make sure the results of the experiment support the hypothesis
to prevent a dangerous condition resulting from a reaction
to examine whether one variable causes a change in another
to prevent an undesired change in a variable
Read the lab procedure for a controlled experiment that looks at the effect of heat on the circumference of bicycle tires.
Step 1: Pump up six identical bike tires to the recommended air pressure.
Step 2: Place three tires under heat lamps, and keep the other three tires at room temperature.
Step 3: After four hours, measure the circumference of each tire.
Step 4: Record your results in the table.
Step 5: (?)
Which step should be next in this procedure?
Write a conclusion for the experiment.
Write a hypothesis for the results.
List the materials that are needed.
Draw a table for the observations.
Inference can be bits of information you gather with your senses? True or False
True
False
Scientific Theory
Scientific Law
Scientific Theory
Scientific Law
Joe tells Gabby his theory about why sea turtles nest on the beach instead of in the ocean. He says, “The turtle eggs would sink to the bottom of the ocean, and the baby turtle would drown. I know this because my uncle is a fisherman, and he told me this information. Gabby tells Joe that his theory is not scientific. Why does Joe’s idea not meet the requirements to be a scientific theory?
Joe’s idea is already a scientific law.
Joe’s idea is not supported by scientific evidence.
Joe’s idea is a good guess that can be tested by experiments.
Joe and his uncle are not scientists.
In 1897, Joseph Thomson discovered that atoms contained electrons. He proposed a change in the atomic theory of that time, and the theory was modified because of his discovery. Since Thomson’s discovery, atomic theory has been further modified. What is the best explanation for why scientific theories are modified?
Theories more than ten years old are usually out of date.
Scientists want to prove that the work of other scientists is wrong.
New evidence that supports a change prompts scientists to modify earlier theories.
So much information is available today that it is harder to focus research and disprove theories.
The law of universal gravitation states that both mass and distance of objects affect the gravitational force between them. Gravitational force increases as the mass of the objects increase. Gravitational force decreases as distance between the objects increases. Why are these statements considered scientific law, and not scientific theory?
The statements tells what happens, and not why it happens.
The statements involve mass and distance measurements.
The statements explain the attractive force between two objects.
The statements predict what will happen under certain conditions.
What is a model (in general)?
A simplified version of something.
A unique picture of an atom.
A image of an atom.
A fun puzzle
Models are used to better understand a complex thing.
True
False
Models can only be “proven” false, NEVER true
True
False
Models help scientists think about possible answers to their questions about ____________.
stuff
words
light
phenomena
What type of variable are the things we keep the same in an experiment?
Number Variable
Independent Variable
Dependent Variable
Constant Variable
What do we call the If, Then Statement in an Experiment?
Conclusion
Hypothesis
Independent Variable
Dependent Variable
Where do we write down and organize our results from an experiment?
Data Table
Line Graph
Bar Graph
Conclusion
An explanation of how our evidence supported or did not support our hypothesis. Uses data results to explain learning.
Hypothesis
Procedures
Data
Conclusion
In the heart rate lab what was the Independent variable
BPM
Type of Activity
Formula used to figure out BPM
Amount of time in seconds we took our pulse.
the basic structural unit of matter
atom
matter
element
nucleus
a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means
element
subatomic particle
electron
matter
an arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column and properties repeat from row to row
Periodic Table of Elements
Atomic Theory
Isotopes
Subatomic Particles
one or two letters that represent the name of an element
element name
element symbol
atomic number
atomic mass
a unique number for each element that equals the number of protons in an atom of that element
element name
element symbol
atomic number
atomic mass
the mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom
element name
element symbol
atomic number
atomic mass
a grouping of elements based on similar properties, arranged by columns in the periodic table; also known as a group
family
period
row
isotope
a row on the Periodic Table of Elements
family
period
row
isotope
What is the atomic number of Barium, Ba? (enlarge the periodic table)
20
38
56
88
How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)
Sodium has 1 proton.
Sodium has 3 protons.
Sodium has 11 protons
how many groups are there in modern periodic table
8
9
18
17
How many valence electrons are in an element in group 14 in the Periodic Table?
4
14
7
8
Elements in a ..................have similar chemical properties.
period
group
row
block
Elements in the Periodic Table of Elements are arranged in ascending order of
Neutron numbers
Nucleon numbers
Proton numbers
Electron numbers
What is the name of elements in Group 2?
Transition metals
Halogens
Metalloids
Alkaline earth metals
