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QUESTION 1
1.
Which of the following is defined as the study of matter and its changes?
science
technology
chemistry
natural philosophy
0.5 points
QUESTION 2
1.
Determine whether the following represents a fact, a belief, a hypothesis, a theory, or a law.
Water boils
at 100oC.
A. Belief
B. Law
C. Hypothesis
D. Theory
Some
numbers are E. Fact
more lucky
than others.
Unknown A
is more
soluble in
water than
unknown B.
The observed
gravitational
effect
between
masses
results from
their warping
of spacetime.
Lithium is a
solid at room
temperature.
0.5 points
QUESTION 3
1.
MRSA infections are becoming more common as the prescribing of antibiotics increases. Which of the following
statements is true?
The DQ for the use of antibiotics to routinely treat sore throats is high.
The DQ for the use of antibiotics to routinely treat sore throats is low.
The DQ for the use of antibiotics to routinely treat sore throats is uncertain.
Antibiotics should never be used to treat sore throats.
0.5 points
QUESTION 4
1.
Which of the following statements about mass and weight is false?
When a chemical reaction occurs, mass is always conserved.
A person’s mass may change from location to location.
A person’s weight may change from location to location.
Weight is the measure of the gravitational force on the matter in an object.
0.5 points
QUESTION 5
1.
Which are reasonable masses for a cell phone and laptop computer, respectively?
100 mg, 100 g
100 g, 100 mg
100 g, 2 kg
1 kg, 2 kg
0.5 points
QUESTION 6
1.
Classify the following as a physical or chemical property.
The glass on a tablet
computer cracks when a
child sits on it.
A. Chemical
B. Physical
Bread becomes moldy
when it is allowed to stand
in the open.
An iron nail rusts when it
gets wet.
Titanium chips burn with a
brilliant while light.
Gold and copper melt at
almost the same
temperature.
0.5 points
QUESTION 7
1.
Classify the following changes as physical or chemical.
Bits of yellow plastic are
melted and forced into a
mold to make a toy.
A. Physical
B. Chemical
Sugar is dissolved in water
to make a solution of sugar
water.
Bacteria are killed by
chlorine added to a
swimming pool.
Waste oil from restaurants
is converted
to biodiesel fuel that burns
differently from cooking
oil.
0.5 points
QUESTION 8
1.
Classify the following as element, compound, homogeneous mixture, or heterogeneous mixture.
Italian salad
dressing
A. Element
Helium
C. Compound
Ice
D. Homogeneous mixture
B. Heterogeneous mixture
Fe2O3
Rubbing
alcohol
Sand
0.5 points
QUESTION 9
1.
What is the density, in grams per milliliter, of 25.0 mL of an unknown liquid having a mass of 22.4 g?
0.896 g/mL
1.11 g/mL
560 g/mL
More information is needed to determine the density.
0.5 points
QUESTION 10
1. Consider the following scenario:
“A woman claims that she has memorized the New Testament. She offers to quote any chapter of any
book entirely from memory.”
Using EACH of the FLaReS principles, evaluate this claim.
Questions
Copy and paste the following into the write submission link, and enter your answers.
1.) For this experiment, we make the assumption that water’s density is 1 g/mL. Using
this information, determine the volume of 20.0 g of water.
2.) Briefly explain why objects sink or float when placed in water.
3.) What conclusion can you make about the relationship between an object’s mass and
the amount of water it displaces?
4.) What conclusion can you make about the relationship between an object’s density
and its ability to sink or float when placed in water?
Notes:
This virtual lab was created by Glencoe and published by Biologycorner.com. The work is
licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.
Part A
Dough to which potassium bromate has been added rises better, producing a lighter, larger volume loaf.
Dough to which potassium bromate has been added rises better, producing a lighter, larger volume loaf.
a theory
a scientific law
an observation
a hypothesis
an experiment
Submit Request Answer
Part B
Potassium bromate acts by oxidizing the gluten and cross-linking tyrosine (an amino acid) units of the
protein molecules, enabling the dough to retain gas better.
Potassium bromate acts by oxidizing the gluten and cross-linking tyrosine (an amino acid) units of the
protein molecules, enabling the dough to retain gas better.
a scientific law
a theory
an experiment
an observation
a hypothesis
Submit Request Answer
Part C
A scientist wonders if sodium bromate might cross-link separate tyrosine molecules, forming a dimer (a
molecule consisting of two subunits).
A scientist wonders if sodium bromate might cross-link separate tyrosine molecules, forming a dimer (a
molecule consisting of two subunits).
an experiment
an observation
a scientific law
a theory
a hypothesis
Submit Request Answer
Part D
She adds sodium bromate to a solution of tyrosine.
She adds sodium bromate to a solution of tyrosine.
an observation
an experiment
a hypothesis
a theory
a scientific law
Submit Request Answer
Part E
She notes that a precipitate (solid falling out of solution) is formed.
She notes that a precipitate (solid falling out of solution) is formed.
an experiment
a scientific law
an observation
a hypothesis
a theory
Problem 1.7
What is a DQ?
What is a DQ?
A DQ is risk divided by benefits.
A DQ is benefits divided by risk.
A DQ is benefits multiplied by risk.
None of the above.
Submit Request Answer
Part B
What does a large DQ mean?
What does a large DQ mean?
A large DQ is the result of large benefits and large risks.
A large DQ is the result of small benefits and small risks.
A large DQ is the result of small benefits and large risks.
A large DQ is the result of large benefits and small risks.
None of the above.
Submit Request Answer
Part C
Why is it often difficult to estimate a DQ?
Why is it often difficult to estimate a DQ?
The calculation of benefits is almost entirely a social judgment and the risks are not always known.
The calculation of benefits is almost entirely a social judgment and the risks and benefits are not
always known.
The calculation of benefits is almost entirely a social judgment and the benefits are not always
known.
None of the above.
Problem1.16
X-rays are widely used in medicine and dentistry. Do a risk-benefit analysis for a dental patient who has
one set of x-rays done per year and a dentist who stays in the room with a patient while x-rays are taken,
three times each day and determine for whom of these people DQ is lower?
X-rays are widely used in medicine and dentistry. Do a risk-benefit analysis for a dental patient who has
one set of x-rays done per year and a dentist who stays in the room with a patient while x-rays are taken,
three times each day and determine for whom of these people DQ is lower?
a dentist
a patient
Problem 1.30
Part A
Milk chocolate melts in the mouth.
Milk chocolate melts in the mouth.
physical property
chemical property
Submit Request Answer
Part B
A laser printer prints faster than an inkjet printer.
A laser printer prints faster than an inkjet printer.
physical property
chemical property
Submit Request Answer
Part C
Titanium chips burn with a brilliant white light.
Titanium chips burn with a brilliant white light.
physical property
chemical property
Submit Request Answer
Part D
Yogurt is made by allowing a bacterial culture to ferment in warm milk.
Yogurt is made by allowing a bacterial culture to ferment in warm milk.
physical property
chemical property
Submit Request Answer
Problem 1.32
Part A
Bacteria are killed by chlorine added to a swimming pool.
Bacteria are killed by chlorine added to a swimming pool.
physical change
chemical change
Submit Request Answer
Part B
Brown print is created in an inkjet printer by mixing cyan, magenta, and yellow inks.
Brown print is created in an inkjet printer by mixing cyan, magenta, and yellow inks.
physical change
chemical change
Submit Request Answer
Part C
Sugar is dissolved in water to make syrup.
Sugar is dissolved in water to make syrup.
physical change
chemical change
Submit Request Answer
Problem1.36
Which of the following mixtures are homogeneous and which are heterogeneous?
Sort these items into the proper categories.
Reset
Help
â?¢
â?¢
gasoline
â?¢ Italian salad dressing
â?¢ rice pudding
an intravenous glucose solution
â?¢
Homogeneous mixtures
â?¢
Heterogeneous mixtures
Problem 1.8
Part A
What derived units of mass are commonly used in the laboratory?
Check all that apply.
Check all that apply.
kg
g
mg
none of the above
Submit Request Answer
Part B
What derived units of length are commonly used in the laboratory?
Check all that apply.
Check all that apply.
Ã?
cm
nm
m
mm
Submit Request Answer
Chapter 1 Question 122
Chemist A claims that a new compound will inhibit the growth of a virulent strain of bacteria. When
Chemist B from a different laboratory tests the compound against the same bacterial strain, the bacteria
grow at their normal rate. Which of the following statements best describes what has happened?
Chemist A claims that a new compound will inhibit the growth of a virulent strain of bacteria. When
Chemist B from a different laboratory tests the compound against the same bacterial strain, the bacteria
grow at their normal rate. Which of the following statements best describes what has happened?
The claim is incorrect, because the test has not been replicated.
The claim is incorrect, because the test has been replicated.
The claim is correct, because the test has been replicated.
The claim is correct, because the data is not falsifiable.

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