unit 1
Human curiosity has led to improvements in technology, which has increased scientists' ability to ____.
a. ask questions
b. make observations
c. think critically
d. form hypotheses
make observations
How is the work of scientists checked for accuracy?
a. Scientists keep detailed records, so the public has access to and reviews their work.
b. Scientists submit their work to scientific journals, and it is reviewed by their peers.
c. Scientists hire a team of editors who check their work for writing and math errors.
Scientists submit their work to scientific journals, and it is reviewed by their peers.
How do researchers investigate ideas and principles about nature?
a. by researching information in textbooks and on the Internet
b. by asking questions about what they do not understand
c. by using the scientific process to study their surroundings
d. by taking classes taught by more knowledgeable professors
by using the scientific process to study their surroundings
Which of the answer choices names a substance that consists of one type of atom?
a compound
an element
a molecule
a mixture
an element
What is the name and symbol of the element in the second row and fourteenth column of the periodic table?
aluminum (Al)
cobalt (Co)
silicon (Si)
carbon (C)
carbon (C)
What question might an applied science researcher ask about wind?
What impact does percent humidity have on wind speed?
What impact does geography have on wind patterns?
How does temperature affect wind speed?
How can wind be used to generate electricity?
How can wind be used to generate electricity?
What are the smallest units an element can be broken down into and still retain its defining properties?
molecules
nano grams
atoms
electrons
atoms
Which of the following is an inorganic compound?
vinegar (C2H4O2)
butane (C4H10)
glucose (C6H12O6)
ammonia (NH3)
ammonia (NH3)
According to Pascal's principle, how does pressure from a hand squeezing a ketchup bottle move throughout the ketchup?
The pressure extends equally in all directions.
The pressure moves in a downward direction.
The pressure moves in an upward direction.
The pressure extends in a sideways direction.
The pressure extends equally in all directions.
How do carbon-12 and carbon-13 differ?
They have different mass numbers.
They have different amounts of electrons.
They have different atomic charges.
They have different amounts of neutrons.
They have different mass numbers.
They have different amounts of neutrons.
hich option describes a common property of the elements, nitrogen (N), phosphorus (P), arsenic (As)?
They have the same number of valence electrons.
They have the same amount of atomic mass.
They have the same amount of reactivity.
They have the same atomic radius size.
They have the same number of valence electrons.
An atom of lithium (Li) and an atom of chlorine (Cl) engage in a chemical reaction.
Which correctly describes the structure of the resulting chemical compound?
The chemical compound will have a ball-and-stick structure.
The chemical compound will have a network structure.
The chemical compound will have triple bonds.
The chemical compound will have double bonds.
The chemical compound will have a network structure.
Given that bromine (Br) is a halogen, what can be inferred as true about bromine?
Bromine does not react easily with other atoms.
Bromine tends to form covalent bonds when in chemical reactions with metals.
Bromine tends to form anions when in chemical reactions with metals.
Bromine has seven electrons and seven protons.
Bromine tends to form anions when in chemical reactions with metals.
wind : swirls :: chemical bond : _[blank]_.
Which option best completes the analogy?
stretches
skips
flashes
jumps
stretches
How do you classify a substance with a pH of 3?
salt
acid
ion
base
acid