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WorksheetsFirst Weeks Review
Total questions: 184
Worksheet time: 3hrs 7mins
17.04 x 2.95 =
This is a(n)...
flask
triple beam balance
graduated cylinder
beaker
this is a(n)
triple beam balance
graduated cylinder
beaker
thermometer
These are...
beakers
graduated cylinders
flasks
rulers
A student is heating an aqueous solution in a test tube during an experiment. The test tube explodes, sending the hot aqueous solution into the student's face. Despite safety goggles, she could feel the solution running into her eyes. Which laboratory safety item should the student use?
safety shower
eye wash station
fire extinguisher
fire blanket
The student pictured here us about to go into a chemistry lab. What lab safety procedure(s) does she need before entering the lab?
I - tie back long hair
II - wear safety goggles
III - wear close-fitting or short sleeves
I only
II only
I and II only
I, II, and III
What is the purpose of a ventilation hood in the laboratory setting?
it cools the environment
it keeps oxygen away from flames
it disperses potentially harmful or unpleasant gases
it measures the volume of gas products
In a laboratory setting, a student is heating a solution of salt water in a flask. The student notices that the bottom of the flask has a small crack. Which of these would be the safest procedure to follow?
keep heating the solution because the crack is small
stop heating the solution and try to tape the crack
keep heating the solution but lower the temperature
stop heating the solution and notify the teacher
While cooking lunch, a chef accidentally starts a grease fire. What common kitchen substance would be best to use to extinguish the fire?
baking soda
liquid soap
water
vinegar
Ethidium bromide is a stain commonly used in DNA experiments. It is also known to cause genetic mutations. What is the most appropriate method of disposing of substances containing ethidium bromide?
discard in a wastepaper basket
flush down the drain with large amounts of water
neutralize with appropriate acid or base
place in a hazardous waste container
Which substance should a student apply to the skin if he or she gets splashed with an acid?
water
vinegar
salt
formaldehyde
A scientist is determined to test the solubility rules of several new compounds. The scientist mixes a little of each new compound with the other known compounds together in a well plate. The scientist records the results and analyzes them against other solubility results. To create a proper control group, the scientist should place each compound in a container –
with various liquids
by itself
with distilled water
with ethyl alcohol
A chemical is labeled as corrosive. Which of the following first aid measures would be needed to prevent the danger from occurring?
Covering exposed skin with aprons and gloves
Wearing flip flops or sandals in lab
Running water over the skin for 15 minutes
Spreading sand on the lab tables and the floor
A student is worried about determining if a chemical is radioactive. Which section of the SDS would the student refer to?
Product Information
Fire Fighting Methods
Physical and Chemical Properties
Hazards Identification
What is the smallest interval that can be measured with the graduated cylinder here?
0.001 mL
0.01 mL
0.1 mL
1 mL
Which piece of glassware can be used with the greatest accuracy to measure volume?
Maria reads that mixing 20 milliliters of water with 20 milliliters of rubbing alcohol will produce a solution with a volume of less than 40 milliliters. She wants to see if this is true. Which instrument should she use to observe this phenomenon?
thermometer
pressure gauge
graduated cylinder
triple beam balance
A student uses a metal spoon to transfer copper powder from a jar onto a plastic tray. The student places the tray on a balance. To accurately measure the amount of copper powder using the balance, the student must know the mass of which object?
jar
tray
spoon
balance
The density of an irregularly shaped floating solid must be calculated. Which of the following would be the correct sequence and method for obtaining the two necessary measurements?
Measure the solid's mass on a balance. Record the initial volume of water in a graduated cylinder. Drop the solid in the water and push it well underneath the water with a pencil or pen. Record the difference in volume.
Measure the solid's mass on a balance. Record the initial volume of water in a graduated cylinder. Gently slide the solid in the water, then push it down just until completely submerged. Record the difference in volume.
Measure 50 mL of water in a graduated cylinder. Drop the solid in the cylinder and record the difference in volume. Remove the solid and immediately measure its mass on a balance.
Place the solid in an empty graduated cylinder. Record the mass of the cylinder plus the solid. Remove the solid and pur in 50 mL of water. Place the solid back in the cylinder and record the difference in volume.
The graduated cylinder here is graduated in increments of –
0.2 mL
0.5 mL
2.0 mL
5.0 mL
Which type of equipment is BEST used to determine the volume of a liquid?
balance
graduated cylinder
meter stick
thermometer
Which of the following is the most important reason to wear safety goggles while performing experiments in the laboratory?
To look professional
To improve your vision
To keep your eyes warm
To protect your eyes from chemical splashes
When measuring the mass of a powder using a balance, what should you do before adding the powder to the container?
Add water to the container
Record the mass of the empty container
Shake the container vigorously
Place the powder directly on the balance pan
What is the correct procedure if a chemical spill occurs on your skin during a laboratory experiment?
Rinse the affected area with plenty of water and notify the teacher
Cover it with a bandage
Ignore it if it doesn't hurt
Wipe it off with a paper towel
What does this pictogram represent?
Oxidizer
Flammable
Explosive
Broken Glassware
What does this pictogram represent?
Flammable
Oxidizer
Explosive
Corrosive
What does this pictogram represent?
Toxic
Corrosive
Carcinogen/Health Hazard
Explosive
What does this pictogram represent?
Oxidizer
Corrosive
Flammable
Gas Under Pressure
What does this pictogram represent?
Flammable
Corrosive
Explosive
Gas Under Pressure
What does this pictogram represent?
Carcinogen
Corrosive
Toxic
Oxidizer
What does this pictogram represent?
Carcinogen
Toxic
Corrosive
Warning: Irritant
What does this pictogram represent?
Corrosive
Environmental Hazard
Oxidizer
Toxic
What does the BLUE color on the NFPA diamond stand for?
Specific Hazard
Health Hazard
Fire Hazard
Reactivity/Instability Hazard
What does the WHITE color on the NFPA diamond stand for?
Specific Hazard
Health Hazard
Fire Hazard
Reactivity/Instability Hazard
What does the RED color on the NFPA diamond stand for?
Specific Hazard
Health Hazard
Fire Hazard
Reactivity/Instability Hazard
What does the YELLOW color on the NFPA diamond stand for?
Reactivity/Instability Hazard
Radioactivity Hazard
Fire Hazard
Health Hazard
What is correct about this image?
Deadly
Extremely Flamable
Extremely Volatile
Reacts with water
What hazards are associated with the chemical shown here? Check ALL that apply!
hazardous carcinogen
gas under pressure
irritant
flammable
environmental hazard
When should you read your lab instructions?
before starting the activity
during the activity
after you finish the activity
only if you think you really need it
When should safety goggles be worn?
at all times in the lab
only when you want to
when liquids could splash into your eyes OR when using glassware
Long hair in the laboratory must be
A. cut short.
B. held away from the experiment with one hand.
C. always neatly groomed.
D. tied back with a hair elastic
If you do not understand what to do in the lab activity, you should
skip it and go on to the next part.
ask the instructor before continuing
try different things until something works
clean up all of the equipment
What is mass?
The amount of matter in an object
The amount of space an object takes up
An object's weight
Which of these tools is used to measure mass of a bunch of bananas?
graduated cylinder
spring scale
thermometer
What unit of measurement is used to measure the mass of a box of paper clips?
grams
meters
centimeters
What unit of measurement would be appropriate when measuring the length of your textbook?
meters
centimeters
kilometers
What unit of measurement would be appropriate for a bottle of water?
mL
cm
L
What object is pictured here?
Beaker
Graduated cylinder
Test tube
What is this object used to measure?
Density
Mass
Volume
What is mass?
The amount of matter in an object
The amount of space an object takes up
An object's weight
What is weight?
The amount of matter in an object
The amount of space an object takes up
The measure of the pull of gravity on an object
What is the object pictured used to measure?
Weight
Mass
Volume
How long is this nail?
Exactly 7 centimeters
About 7 and a half centimeters
7 millimeters
7 inches
What is the volume of water inside this graduated cylinder?
10 mL
13 mL
15 mL
0.00345
When making measurements with this ruler, what place should your answer go to?
hundredths place (0.01)
thousandths place (0.001)
ones place
tenths place (0.1)
Which of the choices is the best measurement to write for the blue line pictured when using proper metric measurement technique?
3.57
30.57
30.7
35.7
Which of the choices is the best measurement to write for the blue line pictured when using proper metric measurement technique?
0.1
0.31
0.3
3.1
Which of the choices is the best measurement to write for the blue line pictured when using proper metric measurement technique?
0.1
0.31
0.3
3.1
5.10 cm
5.1 cm
5 cm
5.100 cm
15 ml
15.0 ml
15.00 ml
16 ml
How many significant figures?
7945
1
2
3
4
How many significant figures?
0.150
1
2
3
4
How many significant figures?
76400.0
3
4
5
6
How many significant figures?
76490
3
4
5
6
2
1
4
A set of data are all close to each other, but they are not close to the actual value. This set of data can be described as having...
good accuracy
good precision
both good precision and accuracy
neither good precision nor good accuracy
What is the length of the blue line?
.3 cm
.33 cm
.03 cm
3.219 cm
Students worked in teams to measure the length of an object. The actual length of the object was 7.0 cm.. Select the best choice that represents their data in terms of accuracy and precision
GROUP RESULTS
5.00 cm
5.01 cm
5.02cm
4.99 cm
5.00 cm
4.99 cm
both accurate and precise
only accurate
only precise
not accurate and not precise
Finish the statement. When it comes to doing problem and using significant figure rules, the answer to the problem__
cannot be anymore precise than the least precise number in the problem, for addition it is the least numbers to the right of the decimal, and for multiplying it is the least number of significant figures
should be that all numbers are significant that appear in a calculator
should never be rounded
should never have any zeros
Examine the picture below and explain what it represents in terms of accuracy and precision
the picture on the left shows low accuracy and low precision. The picture on the right shows high precision but low accuracy
the picture on the right shows low accuracy and low precision. The picture on the left shows high precision but low accuracy
both circles show low precision
Which zero's never count for significant figures?
Leading Zero's
Trailing Zero's
Captive Zero's
All the Zero's
Accuracy is
Measurements that are close together
Measurements that are close to the true value
How close measurements are to the true value
How close together measurements are to each other
Record the following in cm
1.0
1.2
1.25
1.250
1.30
Given: 65.2g and 1.56g/mL
41.78mL
42mL
41mL
41.8mL
Given 25.2g and 10.34mL
2.4g/mL
2.43g/mL
2.44g/mL
2.437g/mL
what does SDS stand for
Mechanical safety data worksheets
safety data sheets
which section of the SDS lets us know the type of PPE to use?
First aid measures
health hazard data
exposure control/personal protective equipment
fire fighting measures
I need to know if a chemical is stable in room temperature, if it may react when exposed to other chemicals.
Look at the reactivity section
look in the other information section
look in the chemical ingredients section
look in the toxicological information section
The first aid measures section of the SDS provides information like:
what to do incase of exposure to skin, eyes, or inhilation
how to prevent esposure
what to do in a fire
what to do when trying to burn the chemical
Which part of MSDS would contain certain info about the effects of the material on humans?
3 - hazards identification
4 - first aid measures
6 - accidental release measures
8 - exposure controls and personal protection
Match the following actions with the most appropriate handling of excess chemicals after a laboratory exercise.
Leave the chemicals at the lab station for the next group.
What to do if you want to improperly manage laboratory safety?
Pour the unused chemicals back into their original containers.
What to do if you want to risk chemical contamination?
Read the MSDS for proper disposal of each unused chemical.
What to do if you want to follow proper laboratory safety and disposal procedures?
Wash the chemicals down the sink with a large amount of water.
What to do if you want to disregard environmental safety?
Match the following Hazardous Material (Hazmat) diamond colors with the appropriate category.
BLUE
heatlh information
WHITE
extra information
RED
flammability information
YELLOW
chemical reactivity information
You are heating a piece of glass and now want to pick it up. You should
use a rag or paper towels
pick up the end that looks cooler
use tongs
pour cold water onit
If you need to determine the odor of a chemical or a solution, you should
use your hand to bring fumes from the container to your nose
bring the container under your nose and inhale deeply
tell your teacher immediatly
If your glassware is chipped or broken, you should
use it for only solid materials
give it to your teacher
put it back in the materials area
increase the damage so that it is obvious
When heating a test tube, it is important to point the test tube
towards your partner
towards yourself
away from you and others
downward
When you finish working with chemicals, biological specimens, and other lab substances, always
treat your hands with skin lotion
wash your hands thoroughly with soap and water
wipe your hands on a towel
wipe your hands on your clothes
Which of the following is the best estimate of the volume poured from the graduated cylinder?
3.00 mL
3.60 mL
4.40 mL
4.60 mL
Three students were asked to measure 8.0 mL of water in a graduated cylinder. The readings were recorded on the board as a comparison. The readings recorded were 7.0 mL, 6.7 mL, and 6.8 mL. Which of the following is the best inference for the three readings?
accurate & precise
accurate but not precise
not accurate but precise
neither accurate nor precise
Three students were asked to weigh 3.5 g of NaCl. The recorded readings were 3.4 g, 3.6 g, and 3.3 g. How can these readings best be interpreted?
accurate & precise
accurate but not precise
not accurate but precise
neither accurate nor precise
A student burned three pieces of Mg, and each weighed 0.50 g. In three separate trials, the mass of MgO was recorded as 0.40 g, 0.38 g, and 0.42 g. Which of the following best describes the results?
accurate
precise
both accurate and precise
neither accurate nor precise
A series of pH measurements were taken during a lab experiment. The expected pH was 7.2. Which set of measurements shows high precision with low accuracy?
7.3, 7.3, 7.3
7.0, 7.2, 7.5
6.8, 7.0, 7.2
6.0, 7.2, 6.8
Four teams of students each measured and recorded the mass of a sample. Each team performed four trials. Their results are shown in the table. Which team recorded the most precise measurement data?
W
X
Y
Z
Which of the following is the most accurate measurement for the length of an object that is actually 15.0 m long?
15.35 m
15.2 m
14.55 m
14.5 m
A hypothesis must always be-
proven right or wrong
obeyed as a law
justified in the data
ignored until the experiment
A student creates a hypothesis about their upcoming experiment. What must the student do in their experiment with relationship to their hypothesis?
change the experiment to make the hypothesis correct
create a law based on the hypothesis
make observations to prove or disprove the hypothesis
ignore the hypothesis
When can a hypothesis be made into a theory?
as soon as it looks like the hypothesis is correct
as soon as a trial shows the hypothesis is correct
as soon as multiple trials shows the hypothesis is correct
after multiple different experiments are completed
If data comes in that disproves a theory, what will happen to the theory?
The theory will become a hypothesis.
Nothing, theories are always right.
The theory will no longer exist.
The theory will be modified to fit the new data.
When testing a hypothesis, what type of data can be taken?
Visual observations
Sounds
Smells
All of the above
How are hypotheses different from theories?
Hypotheses are predictions to experiments, while theories are explanations of how natural phenomena work.
Hypotheses are just guesses, while theories are just guesses on how the world works.
Hypotheses are educated guesses, while theories are explanations for common everyday experiments.
Hypotheses and theories can both be changed, but theories are always correct and hypotheses can be right or wrong.
What information needs to be included to make a testable hypothesis?
just a guess of what will happen
a prediction of the results that will be observed and an explanation of why it will occur
the definition of some of the terms in the experiment and how the results will be determined
a summary of the research done and the impact the information will have on the experiment
What is the definition of a scientific theory?
It is an explanation based on observation, experimentation, and reasoning that has been tested and confirmed as a general principle helping to explain and predict natural phenomena.
It is a statement of fact meant to describe, in concise terms, an action or set of actions. It is generally accepted to be true and universal, and can sometimes be expressed in terms of a single mathematical equation.
It is a trial solution to a problem, often called an "educated guess”, because it provides a suggested solution based on the evidence.
It is principles and procedures for the systematic pursuit of knowledge involving the recognition and formulation of a problem, the collection of data through observation and experiment, and the formulation and testing of hypotheses.
Rearrange the following steps in order of the progression of how a scientific theory is developed.
Observations and measurements are made over natural and physical phenomena.
A hypothesis is created to explain the natural or physical phenomena.
The hypothesis is tested and refined by several scientists over time.
A theory is created to give highly reliable explanations.
A theory can be changed as new discoveries and technology are developed.
Why is it important to make and test hypotheses?
It is a traditional step in the scientific method developed by the Greeks that is set as protocol.
It informs the researcher if they are right or wrong in their thinking about the experiment before it began.
It provides testable statements that can be supported or not supported by observational evidence. Hypotheses which have been tested and supported over a wide variety of conditions are incorporated into theories.
It is additional information that can be used by other researchers in the same or different fields for many different purposes.
It is a trial solution to a problem, often called an "educated guess”, because it provides a suggested solution based on the evidence.
(a)
How are theories different from hypotheses?
A theory has been tested and is accepted as an accurate explanation while a hypothesis is just a prediction.
A hypothesis can be changed while theories cannot be changed because they are always correct.
A hypothesis is an educated guess while a theory is an explanation for common everyday experiments.
A hypothesis is an educated guess while a theory is an explanation for common everyday experiments.
Which of the following would change the current theory of the atom?
electrons found on an 8th energy level
a carbon atom being discovered with 12 neutrons
a new subatomic particle is discovered
a new element is discovered
Which of the following is a hypothesis that could be generated for a laboratory investigation in a High School classroom?
All matter comes from a supernova.
Gravity controls everything in the universe.
All matter is composed of protons, neutrons, and electrons.
Strong acids will react faster than weaker acids.
When German physicist Max Planck proposed Planck's constant h, explaining the pattern of light intensity emitted from a black body at any given frequency, it did not agree with existing models of an atom. Why could theories that are both correct not agree with each other?
New information had to be discovered that would link the two theories together.
Theories are all stand alone and do not have to agree with other theories.
Atoms are complex and sometimes follow each theory independently of the other.
It just proved that neither theory was correct and they should of started over again.
Which of the following statements correctly describes an atomic theory versus a hypothesis or law?
Matter is composed of discrete units called atoms, as opposed to the idea that matter could be divided into smaller pieces indefinitely.
The nucleus is composed of protrons and neutrons while electrons are located outside of the nucleus.
If the atomic number is subtracted from the number of protrons then the number left over is the number of neutrons.
Matter cannot be created nor destroyed.
If new information brought about by new technology disproves a theory, what will happen to the theory?
Nothing, theories are always right.
The theory will no longer exist.
The theory will be modified to fit the new information.
The theory will become a hypothesis.
Which of the following options is the base unit?
kilometer
centimeter
meter
millimeter
Which prefix means 1,000?
kilo
centi
milli-
giga-
Which prefix means 0.01?
kilo
centi
milli-
hecto-
Using the conversion chart, as the units move to the left, the decimal place moves to the ____________.
Right
Sometimes to the right, sometimes to the left
Left
The decimal place doesn't change between units
Which of the following base units measures volume?
gram
liter
meter
What is the basic unit of mass in the metric system?
Liter
Meter
Gram
Kilometer
490,000 m = (a) km
A rock has a mass of 380 grams and a volume of 12 cm3. The density of the rock is __ g/cm3. Round your answer to the thousandths place.
Copper wire sells for $0.74 per meter. How much does a piece of copper wire 4.50 × 10³ cm long cost?
$3.33
$33.30
$333.00
$3,330.00
Which of the following dress procedures should be followed when flames are used in a lab? Select all that apply.
long hair tied back
loose, comfortable clothing
clothing made of natural fibers like cotton
gloves
Which of the following would NOT be used in the event a students clothing caught fire?
eyewash fountain
safety shower
fire blanket
fire extinguisher
This is an excerpt of the Safety Data Sheet (SDS) for sodium hydroxide. Which of the following statements describes what a student should do if sodium hydroxide is swallowed?
The student should call poison control and rinse his mouth.
The student should call poison control and induce vomiting.
The student should get the nurse and rinse his mouth out.
The student should get the nurse and induce vomiting.
This graduated cylinder contains __ mL of liquid.
Josie is about to add 1.3 mL of dilute acid from the pipette shown above to a test tube. Where will the liquid line be in the pipette when she has finished?
1
2
3
4
A team of students uses a balance to find the mass of a large glass beaker. What is the mass of the beaker?
53.6 g
253.6 g
536 g
2536 g
An idea becomes a theory after-
being tested by multiple independent researchers
after a laboratory investigation has been conducted
after multiple trials have occurred
as soon as it becomes possible
A hypothesis is formed when-
The outcome of the experiment is known.
After multiple experiments have been conducted.
After the first trial is completed.
Research has been conducted to see what should happen in an experiment.
“New theories are first of all necessary when we encounter new facts which cannot be 'explained' by existing theories.” Albert Einstein (1950)
Which of the following could be a reason why Albert Einstein thought that theories were important in scientific research?
Theories are well-established and highly-reliable explanations, but may be subject to change as new areas of science and new technologies are discovered.
Theories are a like a history book and help people reflect on what they have learned as the human population has evolved.
Theories are not important but Albert Einstein was justifying his work and research.
Theories are only important when we encounter something new because it lets scientists know that they are looking at something new.
A researcher studies the rate of chemical reactions at different temperatures. Based on the data, what occurs during this reaction?
The reaction rate increases as the temperature increases.
The reaction rate decreases as the temperature increases.
The amount of product increases as the reaction rate increases.
The amount of product decreases as the reaction rate increases.
Kara investigated the growth of crystals under varying environmental conditions. She used three identical sugar solutions to grow the crystals. These solutions were placed at different locations and subjected to different temperatures. Three trials of the procedure were performed. The results are shown in the graph. Which conclusion is best supported by the results?
Temperature changes the color of crystals formed.
Temperature changes the mass of crystals formed.
Temperature changes the speed of crystal formation.
Temperature changes the shape of crystals formed.
An inventor claims to have invented a fusion-reaction powered device that creates more energy than is required to power it. Which of the following would be a reason that the scientific community might reject this claim?
Previous investigations were unable to obtain the same results.
The inventor failed to present observations with data.
Investigations were performed in an unknown laboratory.
The device failed to follow the law of conservation of energy.
At the end of a lab, a student disposes sodium hydroxide in a designated waste container. Information on the disposal of sodium hydroxide is found in section 13 of the safety data sheet (SDS) pictured below. Using the SDS, which of the following statements justifies the use of a designated waste container?
The state of Texas requires sodium hydroxide to be disposed of in a designated container.
The SDS states that sodium hydroxide should be disposed of in a container.
The SDS does not allow sodium hydroxide to be flushed or thrown in the trash.
Using a designated waste container avoids releasing sodium hydroxide into the environment.
The fundamental unit of mass in the metric system is the
meter
kilometer
milliliter
gram
Which of the following statements is/are true? Choose two.
An observation is something that is witnessed and can be recorded.
A theory is an interpretation – a possible explanation of why nature behaves in a particular way.
Even though scientific models are simplifications of reality, they are based on observations and experiments so they eventually become natural laws.
If a theory is disproven, then all of the observations that support that theory are also disproven.
Which of the following is not a step in the scientific notation.
Make an observation
Formulate a hypothesis
Change results to agree with our hypothesis
Perform an experiment
Water has a density of 1.0 g/mL. Which of the objects will float in water?
Object I: mass = 50.0 g; volume = 60.8 mL
Object II: mass = 65.2 g; volume = 42.1 mL
Object III: mass = 100.0 g; volume = 20.0 mL
Object I
Objects II & III
Object III
Objects I and III
Match the following
x1000
kilo
x100
hecto
/100
centi
/1000
milli
The SI prefix that corresponds to a factor of 1000 is
deci
milli
kilo
centi
