Diagnostic

Question 1

Which of the following is the heaviest?

Answer 1

neutron

Question 2

Which of the following is an extensive property of matter?

Answer 2

number of moles

Question 3

Mothballs are used as deodorizers and as pesticides. Upon exposing them in the air for a few hours, they disappeared. Which of the following best explains the scenario?

Answer 3

The mothballs underwent sublimation.

Question 4

Which of the following is described as having components that CAN NOT be physically separated?

Answer 4

Pure substance

Question 5

Which of the following is TRUE for C-13 isotope?

Answer 5

It has 6 protons and 7 neutrons.

Question 6

Chlorine (35.45 g/mol) has two major naturally occurring isotopes Cl-35 and Cl- 37. What is the abundance of the lighter isotope?

Answer 6

77.5

Question 7

Which of the following is NOT a possible set of quantum numbers?

Answer 7

n = 3 , l = 0, ml = -1 , ms -1/2

Question 8

What is the correct scientific notation for 0.0078 µg/mL of compound A?

Answer 8

7.8x10-3 µg/mL

Question 9

Which of the following group is commonly used as components in pesticides? This group is also characterized as having seven valence electrons.

Answer 9

halogens

Question 10

Which of the following corresponds to the electron configuration 1s2 2s2 2p6?

Answer 10

Na+

Question 11

Which is the correct arrangement for increasing affinity for electrons?

Answer 11

Ne < K < Na < Cl

Question 12

Which of the following atoms is the largest?

Answer 12

Cs

Question 13

Fluorine is capable of forming covalent bonds with which of the following element?

Answer 13

Boron

Question 14

Which of the following does NOT describe a nonpolar bond?

Answer 14

It has a dipole moment.

Question 15

Which of the following statements is TRUE?

Answer 15

Single bonds have lower energy than double bonds.

Question 16

Which of the following is a polar molecule?

Answer 16

SF4

Question 17

Which compound has the greatest intermolecular force of attraction?

Answer 17

CH3OH

Question 18

What is the name of the compound PCl3

Answer 18

Phosphorus trichloride

Question 19

What is the chemical formula of plumbous oxide?

Answer 19

PbO

Question 20

Which of the following is the correct composition of aqua regia?

Answer 20

1 HNO3: 3 HCI

Question 21

Sodium carbonate is also known as?

Answer 21

soda ash

Question 22

The standard pressure of the atmosphere at sea level is

Answer 22

1 ATM
760 mmHg
760 torr

Question 23

At 25C a gas expands from 30 kPa and 5.0 L to 70C and 10 kPa. Calculate its final
volume

Answer 23

17 L

Question 24

What is the density of oxygen at 1 atm and 25C?

Answer 24

1.31 g/L

Question 25

What are the conditions to achieve the non-ideality of gases?

Answer 25

high T, low P

Question 25

What is the percentage of carbon in C2H4?

Answer 25

86

Question 26

An analysis of a compound shows 62.04% C, 10.41% H, and 27.55% O. Which of the following is the most probably?

Answer 26

C3H6O

Question 27

What are the coefficients of HCI and ICI if the equation below is balanced? HIO3 + FeI2 + HCl -> FeCl3 + ICl + H2O

Answer 27

25 and 13

Question 28

Consider the complete combustion of glucose. If 25 g of glucose was burnt with 40 g of oxygen, how many grams of CO2 was formed?

Answer 28

37

Question 29

Consider the complete combustion of glucose. If 25 g of glucose was burnt with 40 g of oxygen, how many grams of the excess reactant remained unreacted? C6H12O6 + O2 -> CO2 + H2O

Answer 29

13

Question 30

Which is also equivalent to 0.01% percent by weight?

Answer 30

100ppm

Question 31

What volume of 4 M HCI is needed to prepare 1 L of a 0.5 M dilute solution?

Answer 31

0.125 L

Question 32

A 2.4 L of HNO3 solution reacts with 63 mL of 1.9 N Ba(OH)2 to produce a neutral solution. What is the molar concentration of the original HNO3 solution?

Answer 32

0.05 M

Question 33

What is the indicator that turns the solution into colors blue, green, and yellow if it becomes basic, neutral, and acidic, respectively?

Answer 33

bromthymol blue

Question 34

What is the normality of a 5.0 M sulfuric acid?

Answer 34

10.0 N

Question 35

How many grams of sodium persulfate (Na2S2O8) is required to prepare a 1 L solution with concentration of 10% (w/v)? This solution is used as oxidizing reagent for Total Organic Carbon analyzer (TOC).

Answer 35

100 g

Question 36

What is the oxidation state of chromium in K2Cr2O7?

Answer 36

+6

Question 37

What is the overall cell potential for a voltaic cell that uses the half-reactions below? Cu and Ag

Answer 37

0.46 V

Question 38

Consider the endothermic reaction A (g) ⇋ B (g) + C (g), which will cause a backward shift?

Answer 38

decreasing the temperature

Question 39

Which of the following is a **primary standard** for use in standardizing bases?

Answer 39

Potassium hydrogen phthalate

Question 40

Which of the following is the most accurate apparatus in measuring 8.55 mL of liquid?

Answer 40

10mL pipet

Question 41

Which of the following is NOT a proper laboratory practice?

Answer 41

Adding water to strong acid

Question 42

Which of the following is the most appropriate container for hexane?

Answer 42

Amber bottle

Question 43

Which of the following shows the correct path of light travel in a spectrophotometer?

Answer 43

source — monochromator — sample — detector

Question 44

Cuvettes made of this material are required when working at a wavelength below 300 nm where other materials show a significant absorption.

Answer 44

quartz

Question 45

Consider the endothermic reaction A (g) ⇋ B (g) + C (g), which will cause a backward shift?

Answer 45

decreasing the temperature

Question 46

A blank that contains the solvent plus all the reagents used in sample preparation.

Answer 46

Reagent blank

Question 47

A graphical representation of measuring signal as a function of quantity of analyte.

Answer 47

Calibration curve

Question 48

A solution has a pH of 3.72 with an absolute certainty of ±0.03. Determine the H+ concentration of the solution and its corresponding absolute certainty.

Answer 48

1.9 (±0.1) x 10-4 M

Question 49

What is the oxidation state of chromium in K2Cr2O7?

Answer 49

+6