Which of the following describes the process s of concluding? -correct answerMaking a
determinstion based on the results of a controlled experiement.
A chemistry experiment is performed to determine the effect of a nonvolatile solute on the
boiling point of water. Three trials are performed in which 10 MG, 20 MG and 30 MG of salt
are added to 500 ML of distilled water. Each solution is heated on a hot plate, and the
elevated boiling points are recorded. Which of the following correctly identifies the
independent and dependent variable? -correct answerThe independent variable is the
amount of salt, and the dependent variable is the temperature at which the water boils.
which of the following is not true concerning forming and testing hypothesis? -correct
answerA good hypothesis will not be disapproved by testing.
which of the following is the correct expression of 0.0034050 in scientific notation? -correct
answer3.4050 x 10^-3
Which of the following numbers has for significant figures? -correct answer0.003020
what is the correct expression of 91,000 X 87,000 using scientific notation and significant
figures? -correct answer7.9 x 10^9
students experimentally determined that the specific heat of copper is 0.410 1/g x degree C.
if the known value of the specific heat of copper is 0.385 1/g x degree C, what is the percent
error? -correct answer6.49%
two balances in a classroom laboratory are used to determine the mass of an object. The
actual mass of the object is 15.374 g. Which of the following statements is true concerning
the accuracy and precision of these two balances? -correct answerThe digital balance is both
more accurate and more precise.
which of the following subskills best fits the process skill of observing? -correct answerusing
the five senses to collect evidence and write descriptions
which of the following sets of quantities are equivalent? -correct answer2,310 mg and 2.310
g
which of the following best describes the relationship of this set of data? -correct
answerLow positive correlation
which of the following is not true concerning correlation? -correct answercorrelation can
show cause and effect
Which of the following is not a recommended storage practice for laboratory chemicals? -
correct answerchemicals may be routinely stored on bench tops
which of the following is the best prediction for solubility at 150°C? -correct answer130 g
KBr per 100 g H2O
, which of the following conclusions can be drawn from the data presented in the graph
below? -correct answerincreasing the solute decreases the vapor pressure and increases the
boiling point of this solution
What are pure substances that consist of more than one type of atom? -correct
answercompounds
Which of the following statements concerning the states of matter is not true? -correct
answerliquids have no definite shape and no definite volume
The symbol for calcium ion is Ca^2. Which of the following statements is true concerning this
ion? -correct answerthis cation has fewer electrons than protons
which of the following subatomic particles has the smallest mass? -correct answerElectrons
a uranium isotope is represented by the symbol 238/92U. how many neurons does an atom
of this isotope contain? -correct answer146
Which of the following represents an alpha particle? -correct answer4/2He^2+
Which of the following is an example of a chemical change? -correct answerSilver tarnishing
which temperature scales have exactly 100° between the freezing point and the boiling point
of water? -correct answerCelsius and kelvin
Which is an example of convection as a method of heat transfer? -correct answerA person
warming his hands by washing with hot water
The energy flow through an ecosystem is represented by an energy pyramid. In the energy
pyramid for a terrestrial ecosystem, the producers utilize 6000 kilocalories per square meter
per year. What approximate amount of energy is transferred to the third trophic level of this
ecosystem? -correct answer60 kilocalories per square meter per year
Which of the following general statements concerning ideal gases is true? -correct
answervolume is inversely proportional to pressure
According to the kinetic theory of matter which of the following statements is true? -correct
answerThe average kinetic energy is directly proportional to the square of the average
velocity of the particles
in general, where in The periodic table of elements are the elements with the largest atomic
radii located? -correct answerbottom left corner
what is the name of the compound CuCl2? -correct answercopper (II) chloride
which of the following molecules exhibits ionic bonding? -correct answerNaCl
given the chemical reaction 4Al(s) + 302(g) —> 2Al2O3(s), how many moles of O2(g) are
needed to produce 100.0 moles of 2Al2O3(s)? -correct answer150.0
determinstion based on the results of a controlled experiement.
A chemistry experiment is performed to determine the effect of a nonvolatile solute on the
boiling point of water. Three trials are performed in which 10 MG, 20 MG and 30 MG of salt
are added to 500 ML of distilled water. Each solution is heated on a hot plate, and the
elevated boiling points are recorded. Which of the following correctly identifies the
independent and dependent variable? -correct answerThe independent variable is the
amount of salt, and the dependent variable is the temperature at which the water boils.
which of the following is not true concerning forming and testing hypothesis? -correct
answerA good hypothesis will not be disapproved by testing.
which of the following is the correct expression of 0.0034050 in scientific notation? -correct
answer3.4050 x 10^-3
Which of the following numbers has for significant figures? -correct answer0.003020
what is the correct expression of 91,000 X 87,000 using scientific notation and significant
figures? -correct answer7.9 x 10^9
students experimentally determined that the specific heat of copper is 0.410 1/g x degree C.
if the known value of the specific heat of copper is 0.385 1/g x degree C, what is the percent
error? -correct answer6.49%
two balances in a classroom laboratory are used to determine the mass of an object. The
actual mass of the object is 15.374 g. Which of the following statements is true concerning
the accuracy and precision of these two balances? -correct answerThe digital balance is both
more accurate and more precise.
which of the following subskills best fits the process skill of observing? -correct answerusing
the five senses to collect evidence and write descriptions
which of the following sets of quantities are equivalent? -correct answer2,310 mg and 2.310
g
which of the following best describes the relationship of this set of data? -correct
answerLow positive correlation
which of the following is not true concerning correlation? -correct answercorrelation can
show cause and effect
Which of the following is not a recommended storage practice for laboratory chemicals? -
correct answerchemicals may be routinely stored on bench tops
which of the following is the best prediction for solubility at 150°C? -correct answer130 g
KBr per 100 g H2O
, which of the following conclusions can be drawn from the data presented in the graph
below? -correct answerincreasing the solute decreases the vapor pressure and increases the
boiling point of this solution
What are pure substances that consist of more than one type of atom? -correct
answercompounds
Which of the following statements concerning the states of matter is not true? -correct
answerliquids have no definite shape and no definite volume
The symbol for calcium ion is Ca^2. Which of the following statements is true concerning this
ion? -correct answerthis cation has fewer electrons than protons
which of the following subatomic particles has the smallest mass? -correct answerElectrons
a uranium isotope is represented by the symbol 238/92U. how many neurons does an atom
of this isotope contain? -correct answer146
Which of the following represents an alpha particle? -correct answer4/2He^2+
Which of the following is an example of a chemical change? -correct answerSilver tarnishing
which temperature scales have exactly 100° between the freezing point and the boiling point
of water? -correct answerCelsius and kelvin
Which is an example of convection as a method of heat transfer? -correct answerA person
warming his hands by washing with hot water
The energy flow through an ecosystem is represented by an energy pyramid. In the energy
pyramid for a terrestrial ecosystem, the producers utilize 6000 kilocalories per square meter
per year. What approximate amount of energy is transferred to the third trophic level of this
ecosystem? -correct answer60 kilocalories per square meter per year
Which of the following general statements concerning ideal gases is true? -correct
answervolume is inversely proportional to pressure
According to the kinetic theory of matter which of the following statements is true? -correct
answerThe average kinetic energy is directly proportional to the square of the average
velocity of the particles
in general, where in The periodic table of elements are the elements with the largest atomic
radii located? -correct answerbottom left corner
what is the name of the compound CuCl2? -correct answercopper (II) chloride
which of the following molecules exhibits ionic bonding? -correct answerNaCl
given the chemical reaction 4Al(s) + 302(g) —> 2Al2O3(s), how many moles of O2(g) are
needed to produce 100.0 moles of 2Al2O3(s)? -correct answer150.0
