TEXES Science 7-12 (236) Study Guide Test Questions
And Answers Rated A+
Which of the following describes the process s of concluding? ANS Making a determination based on
the results of a controlled experiment.
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? ANS The 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? ANS A good
hypothesis will not be disapproved by testing.
which of the following is the correct expression of 0.0034050 in scientific notation? ANS 3.4050 x
10^-3
Which of the following numbers has for significant figures? ANS 0.003020
what is the correct expression of 91,000 X 87,000 using scientific notation and significant figures? ANS
7.9 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? ANS 6.49%
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? ANS The digital balance is both more accurate and more precise.
which of the following subskills best fits the process skill of observing? ANS using the five senses to
collect evidence and write descriptions
which of the following sets of quantities are equivalent? ANS 2,310 mg and 2.310 g
, which of the following best describes the relationship of this set of data? ANS Low positive
correlation
which of the following is not true concerning correlation? ANS correlation can show cause and effect
Which of the following is not a recommended storage practice for laboratory chemicals? ANS
chemicals may be routinely stored on bench tops
which of the following is the best prediction for solubility at 150°C? ANS 130 g KBr per 100 g H2O
which of the following conclusions can be drawn from the data presented in the graph below? ANS
increasing 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? ANS compounds
Which of the following statements concerning the states of matter is not true? ANS liquids 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? ANS
this cation has fewer electrons than protons
which of the following subatomic particles has the smallest mass? ANS Electrons
a uranium isotope is represented by the symbol 238/92U. how many neurons does an atom of this isotope
contain? ANS 146
Which of the following represents an alpha particle? ANS 4/2He^2+
Which of the following is an example of a chemical change? ANS Silver tarnishing
And Answers Rated A+
Which of the following describes the process s of concluding? ANS Making a determination based on
the results of a controlled experiment.
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? ANS The 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? ANS A good
hypothesis will not be disapproved by testing.
which of the following is the correct expression of 0.0034050 in scientific notation? ANS 3.4050 x
10^-3
Which of the following numbers has for significant figures? ANS 0.003020
what is the correct expression of 91,000 X 87,000 using scientific notation and significant figures? ANS
7.9 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? ANS 6.49%
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? ANS The digital balance is both more accurate and more precise.
which of the following subskills best fits the process skill of observing? ANS using the five senses to
collect evidence and write descriptions
which of the following sets of quantities are equivalent? ANS 2,310 mg and 2.310 g
, which of the following best describes the relationship of this set of data? ANS Low positive
correlation
which of the following is not true concerning correlation? ANS correlation can show cause and effect
Which of the following is not a recommended storage practice for laboratory chemicals? ANS
chemicals may be routinely stored on bench tops
which of the following is the best prediction for solubility at 150°C? ANS 130 g KBr per 100 g H2O
which of the following conclusions can be drawn from the data presented in the graph below? ANS
increasing 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? ANS compounds
Which of the following statements concerning the states of matter is not true? ANS liquids 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? ANS
this cation has fewer electrons than protons
which of the following subatomic particles has the smallest mass? ANS Electrons
a uranium isotope is represented by the symbol 238/92U. how many neurons does an atom of this isotope
contain? ANS 146
Which of the following represents an alpha particle? ANS 4/2He^2+
Which of the following is an example of a chemical change? ANS Silver tarnishing
