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Essay topic: General chemistry quiz

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1) Choose the right statement abut the definition of chemistry

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a) Chemistry seeks to understand the behavior of matter by studying its properties only in the macroscopic scale

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b) Quantum theory is one of the scientific tools that is used in chemistry to understand the behavior of matter 

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c) Chemistry does not seek to understand matter behavior, only seeks to transform it

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d) Chemistry disregards the behavior of matter, only focuses on thermodynamics

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2) Answer true (T) or false (F) to the following statements:

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a) Molecules are the elemental building blocks of matter 

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b) Atoms in their pure form are difficult to find in nature, they are easily found by different molecular arrangements 

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c) The properties of substances are strongly dependent on their atomic and molecular compositions 

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d) Molecules are composed by at least one atom 

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3) Choose the wrong statement:

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a) Scientific knowledge is based on observations and experiments

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b) Hypotheses are tentative interpretations of the subject of study, based on observations

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c) Hypotheses never can be refuted 

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d) Scientific theories are the pinnacle of the scientific knowledge

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4) Regarding to the definition of energy, choose the statement that best fit

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a) Energy is the capacity to sustain a constant force by a certain amount of time

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b) The capacity to apply a force along certain distance is defined as energy 

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c) Energy is the sum of potential plus kinetic energies multiplied by time

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d) Energy is the product of work and time

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5) Choose the right units (of the International System of units, SI) of mass and energy, respectively

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a) Mole & Watt

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b) Kilogram & Joule 

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c) gram & Joule

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d) Kilogram & BTU

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6) Choose the right symbols for the SI system of the prefixes multiplied correspondingly to 1012 and 10-9

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a) P and m

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b) T and p

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c) G and a

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d) T and n

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7) From the Table 1.4 of lesson #2, to which material corresponds the density of 6,500 kg in 2.5 m3?

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a) Gold

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b) Ethanol

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c) Glass 

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d) Water

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8) In order to prepare an experiment, you weighted a reactant in a balance and read 1.0236. Which is/are the digit(s) with uncertainty/uncertainties?

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a) 36

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b) 6 

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c) 236

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d) 0236

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9) Choose the correct statement regarding to the certainty of data measured in a laboratory

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a) We get a better certainty of data by analyzing a sample with the highest tolerated amount of significant figures 

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b) The amount of significant figures is irrelevant, therefore the certainty is independent of that 

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c) The certainty of the results depends only on the half of significant figures of a given result/datum

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d) In order to get a satisfactory level of certainty in chemical experiments is only necessary 1 significant figure

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10) Which is the correct scientific notation?

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a) 1,600.0

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b) 1,600

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c) 1.6 x 103

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d) 1,6 x 103 

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11) Which is the right result in terms of significant figures from the multiplication of 1.43 x 10-3 x 2.2 x 10-5?

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a) 3.1 x 10-8 

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b) 3.14 x 10-8

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c) 3.15 x 10-8

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d) 3.2 x 10-8

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12) By applying rounding and the right amount of significant figures, which is t he right results of the division of 6.42/1.041?

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a) 6.2

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b) 6.17 

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c) 6.167

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d) 6.1

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Part II. Fill in the blanks (always use scientific notation).

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1) How many meters are 16 inches? ___________________ 

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2) How many liters are 650 microliters? _____________________ 

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3) 2,500 mm2 to nm2 (use 2 significant figures) _________________________ 

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4) Convert 4.5 kPa to atm _________________________ 

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5) The amount of charge of an electron, in Coulombs, is _______________________ 

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6) The positive charge of an atom is contained in its ____________________ 

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7) The mass of a neutron, in kg, is (give 3 significant figures) ________________________ 

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8) The definition of the atomic number “Z” is _______________________________________ 

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9) The mass number of the isotope of carbon with 7 neutrons is ___________

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10) From the periodic table, write the symbols of two metalloids ___________________ 

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Part III. Calculations (always use rounding and the right amount of significant figures)

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1) Based on the periodic table, determine the mass, in kg, of Fe(II), use 3 significant figures.

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2) Calculate the number of atoms in 0.1 g of Na (use the periodic table)

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3) How many grams there are in 0.25 moles of NH4?

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4) How many grams there are in 1 mol of benzene? (C6H6)

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5) How many moles of Cl2 there are in 50 g?

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