General Chemistry Midterm Exam
1-11-2016
Name & Surname :____________________
ID :____________________
Duration : 60 minutes
There are 25 questions and all question is 2.5 point.
Please write all of your answer onto your questionnaire
A- MULTIPLE CHOICE. Choose the one alternative that best completes the statement or
answers the question.
1- Express the answer to the following problem using the appropriate number of tri significant
figures: (7.89 × 4.925) - 0.1
A) 38.8 B) 38.758 C) 38.7583 D) 38.7 E) 39.9
2- The precision of a data set is considered to be poor, if
A) the data do not stray from the average value.
B) the accuracy is low.
C) the data vary widely from the average value.
D) the accuracy is high.
E) the data are a set of closely spaced numbers.
3- A solid block of material has the dimensions 1.2 cm x 3.5 cm x 4.2 cm. If the mass of the
block is 50 g, what is the density of the material?
A) 880 B) 28 C) 0.28 D) 2.8 E) 0.35
4- Which of the following does not represent a chemical property?
A) shock sensitivity of nitroglycerin
B) conductivity of electricity
C) burning of gasoline
D) stability of gold
E) rusting of iron in air
5- Calculate the energy change when an electron moves from energy level 4 to energy level 1
in the hydrogen
atom.
A) 2.04 × 10-18
B) -1.63 × 10-18
C) -2.04 × 10-18
D) 1.36 × 10-19
E) 3.49 × 10-17
6- Which of the following is not a quantity used to characterize electromagnetic radiation?
A) wavelength B) speed C) frequency D) amplitude E) charge
