Day 1

Question 1

Perchloroethylene, which is liquid at room temperature, is one of the most widely used solvents for commercial dry cleaning. It is sold for this purpose under several trade names, including Perclene. Does this molecule have polar bonds? Is it a polar molecule? Does it have a dipole?

Answer 1

Yes, non-polar, none

Question 2

The radioactive nucleus responsible for thyroid cancer caused by Chernobyl accident

Answer 2

I–131

Question 3

You place manganese, calcium chloride, and sodium acetate in a liquud, in which they are not soluble. The liquid has a density of 2.15 g/ml. Which will sink to the bottom, which will stay on the top, and which will stay in the middle of the liquid?

Answer 3

Manganese, Sodium acetate, Calcium chloride

Question 4

Classify these as kinetic or potential energy

(1) water held by a dam
(2) a speeding train
(3) a book on its edge before falling
(4) a falling book
(5) electric current in a light bulb

Answer 4

Potential, kinetic, potential, kinetic, kinetic

Question 5

What process combines rubber and sulfur at a high temperature?

Answer 5

Vulcanisation

Question 6

Who invented the carbon-14 dating method?

Answer 6

Williard Libby

Question 7

Formula of red lead

Answer 7

Pb3O4

Question 8

Predict which of these ionic compounds are soluble in water:

(1) MgCl2
(2) CaCO3
(3) Na2SO3
(4) NH4NO3
(5) Pb(OH)2

Answer 8

Soluble, insoluble, insoluble, soluble, insoluble

Question 9

Polymer used in bullet proof vest

Answer 9

Polymethyl acrylate

Question 10

A voltaic cell is represented by the following equation:
Fe(s) + Zn2+(aq) → Fe2+(aq) +Zn(s)

Which electrode is the anode and which electrode is the cathode?

Answer 10

Anode: Fe
Cathode: Zn

Question 11

The only natural amino acid that has no chiral center

Answer 11

Glycine

Question 12

The heat of combustion of methane, the major component of natural gas, is 213 kcal/mol. The heat of combustion of propane, the major component of LPG or bottled gas, is 530 kcal/mol. On a kcal/mol basis, which of these two fuels is the better source of heat energy? On kcal/g basis, which of these two fuels is the better source of heat energy?

Answer 12

kcal/mol: propane

kcal/g: methane

Question 13

How to differentiate alkane, alkene, and alkyne?

Answer 13

React with Br2

Question 14

Process of breaking down a large isotope into smaller isotopes

Answer 14

Nuclear fission

Question 15

Can a hydrogen be form between

(1) Two molecules of methanol, CH3OH
(2) Two molecules of formaldehyde, CH2O
(3) One molecule of methanol, CH3OH, and one molecule of formaldehyde, CH2O?

Answer 15

Yes, no, yes

Question 16

What will happen to ice at 0°C if the pressure decrease from 1 atm to 0.001 atm?

Answer 16

It becomes vapor

Question 17

How does alpha, beta and gamma particle affect the mass number of an atom?

Answer 17

4, 0, 0

Question 18

Notation on alkane containing Cl

Answer 18

Chloro

Question 19

Melvin Calvin was known for his study of

Answer 19

Photosynthesis

Question 20

Best definition of chemical nature of soap

Answer 20

A soap is a salt of a long chain carboxylic acid

Question 21

Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described?

Answer 21

Sublimation

Question 22

Given: Dodecane

(1) Is it soluble in water?
(2) Is it soluble in hexane?
(3) Is it combustible?
(4) Is it solid, liquid or gas at room temperature and atmospheric conditions?
(5) Is it denser than water?

Answer 22

No, yes, yes, liquid, less dense

Question 23

Which has a larger ionic nucleus, Na+ or Na?

Answer 23

Na

Question 24

The purpose of control rods in a fission reactor is to

Answer 24

Absorb neutrons generated in the fission process

Question 25

What compound is a ketone, is not a carbohydrate but is useful commercially?

Answer 25

Acetone

Question 26

Arrange in increasing polarity: C-C, C-N, C-Cl, C-F, C-O

Answer 26

C-C < C-Cl < C-N < C-O < C-F

Question 27

Which Republic Act is the PRC Modernization Act of 2000?

Answer 27

R.A. 8981

Question 28

You are presented with a Lewis dot structure of element X as X•. To which two groups in the periodic table might this element belong?

Answer 28

Group 2A

Question 29

The solubility of aspartic acid in water is 0.500 g in 100 mL at 25°C. If we dissolve 0.251 g of aspartic acid in 50 mL of water at 50°C and let the solution cool to 25°C without stirring, shaking, or otherwise disturbing the solution, would the resulting solution be a saturated, unsaturated, or supersaturated solution?

Answer 29

Supersaturated

Question 30

Water on heating from 1 to 4°C

Answer 30

Contracts

Question 31

This law explains why aerosol cans carry the warning "Do not incinerate".

Answer 31

Gay-Lussac Law

Question 32

The normal boiling point of a substance depends on both the mass of the molecule and the attractive forces between molecules. Arrange the compounds in each set in order of increasing boiling point: (1) HCl, (2) HBr and (3) HI

Answer 32

HCl < HBr < HI

Question 33

Which isotope of boron is the most stable: boron-8, boron-10, or boron-12?

Answer 33

Boron-10

Question 34

What is the specific gas constant of dry air in J/kg per unit Kelvin?

Answer 34

287

Question 35

Write an equation for the reaction of HCl with each compound. Which are acid-base reaction? Which are redox reactions? (1) Na2CO3 (2) Mg (3) NaOH (4) NH3 (5) Fe2O3 (6) CH3NH2 (7) NaHCO3

Answer 35

Only (2)

Question 36

Classify the following systems as homogeneous, heterogeneous, or colloidal mixtures. (1) Physiological saline solution (2) Orange juice (3) A cloud (4) Wet sand (5) Suds (6) Milk

Answer 36

Homogeneous, heterogeneous, colloidal, heterogeneous, colloidal, colloidal

Question 37

Assume that the following exothermic reaction is at equilibrium: H2(g) ←→ I2(g) + 2 HI(g) Tell whether the position of the equilibrium will shift to the right or left if we (1) Remove some HI (2) Add some I2 (3) Remove some I2 (4) Increase the temperature (5) Add a catalyst

Answer 37

Right, right, left, left, no shift

Question 38

In an endothermic reaction, the activation energy is 10.0 kcal/mol. Is the activation of the reverse reaction also 10.0 kcal/mol, or would it be more or less?

Answer 38

The same

Question 39

_______ is a rather disagreeable-smelling liquid used as a preservative for laboratory specimen

Answer 39

Methanal

Question 40

Reactions proceed spontaneously at low temperatures. At high temperatures, the reverse reaction becomes spontaneous at

Answer 40

–∆H and –∆S

Question 41

Common name of C6H5OCH3

Answer 41

Anisole

Question 42

The influence of mixing of s and p orbitals; thr greater the fraction of s character of the hybrid orbital, the more electronegative is the atom

Answer 42

Hybridization Effect

Question 43

For each of the following, identify the radiation emitted. (1) Beryllium-10 changes to Boron-10 (2) Europium-151m changes to Europium-151 (3) Thallium-195 changes to Mercury-195 (4) Plutonium-239 changes to Uranium-235

Answer 43

Beta, gamma, positron, alpha

Question 44

Balance the chemical equation K4Fe(CN)6 + KMnO4 + H2SO4 → KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 + CO2 + H2O

Answer 44

10, 122, 299, 162, 5, 122, 60, 60, 188

Question 45

The difference between the actual property value of a solution and the value it would have as an ideal solution at the same T and P and composition is called

Answer 45

Excess

Question 46

Assume the density of the compacted waste to be 490 kg/m³. What is the ratio of HPO4²-/H2PO4- in a phosphate buffer of pH 7.9 (the pH of human pancreatic fluid)?

Answer 46

5:1

Question 47

Above the stratosphere, the concentration of ozone and other gases is low, and the temperature decreases with increasing altitude

Answer 47

Mesosphere

Question 48

The mass of proton or neutron is approximately ___ times that of an electron.

Answer 48

1836

Question 49

Deuterium or heavy hydrogen has an atomic number of 1 and a mass of

Answer 49

2

Question 50

Volume of an ideal gas is zero at ___

Answer 50

-273 deg C

Question 51

The basic repeating structural unit of a lattice is the

Answer 51

Unit cell

Question 52

A sequence of three nucleotides in mRNA that directs the incorporation of an amino acid during protein synthesis or signals the start or stop of translation

Answer 52

Codon

Question 53

Base pairing is accompanied by

Answer 53

Hydrogen bonds

Question 54

The movement of a piece of DNA around the chromosome.

Answer 54

Transposition

Question 55

An enzyme that hydrolyzes proteins to their constituent amino acids

Answer 55

Protease

Question 56

When active protein synthesis is taking place in the cell, which material is not required in the ribosomes?

Answer 56

DNA

Question 57

The transport of oxygen and carbon dioxide is carried out by the

Answer 57

Erythrocytes

Question 58

Allergies, such as hay fever, result from

Answer 58

An abnormal immunity to a common substance

Question 59

The most abundant organic substance found in nature is

Answer 59

Cellulose

Question 60

Sugars in which the aldehyde group can be oxidized to a carboxylic acid group are called

Answer 60

Reducing sugars

Question 61

A continuous culture system equipped with a photocell that adjust the flow of medium through the culture vessel so as to maintain a constant cell density or turbidity

Answer 61

Turbidostat

Question 62

The molecule that carries anticodon

Answer 62

tRNA

Question 63

The enzyme that is expected to find in greater concentration in the stomach of a baby than in an adult's stomach

Answer 63

Rennin

Question 64

The filtrate of malted grains used as the substrate for the production of beer and ale by fermentation

Answer 64

Wort

Question 65

Hydrogen peroxide (H2O2) is a toxic by-product of cellular metabolism in aerobic microorganisms. The reaction 2H2O2 --> 2H2O + O2 occurs within the cells to prevent the accumulation of hydrogen peroxide. In this reaction, catalase functions as an

Answer 65

Enzyme in the breakdown of hydrogen peroxide

Question 66

The cycle that oxidizes acetyl coenzyme A to CO2 and generates NADH and FADH2 for oxidation in the electron transport chain; the cycle also supplies carbon skeletons for biosynthesis

Answer 66

Tricarboxylic acid cycle

Question 67

What type of enzyme will catalyse the reaction: Galactose-6-P --> Glucose-6-P

Answer 67

Isomerase

Question 68

A loosely bound cofactor that often dissociates from the enzyme active site after product has been formed.

Answer 68

Coenzyme

Question 69

An organic compound required by organisms in minute quantities for growth and reproduction because it cannot be synthesized by the organism; it often serve as enzyme cofactors or parts of cofactors

Answer 69

Vitamins

Question 70

A bacterial infection transmitted by contaminated food, water, milk, or shellfish. The causative organism is Salmonella typhi, which is present in human feces

Answer 70

Typhoid fever

Question 71

The synthesis of complex molecules from simpler molecules with the input energy

Answer 71

Anabolism

Question 72

The organelle where protein synthesis occurs; the message encoded in mRNAis translated here

Answer 72

Ribosomes

Question 73

Myoglobin is an example of what type of protein?

Answer 73

Globular protein

Question 74

Organisms that use sunlight as their energy source

Answer 74

Phototrophs

Question 75

Asexual reproduction in which a cell or an organism separates into two cells

Answer 75

Binary fission

Question 76

What compound is at the "branch point" in the metabolism of all foodstuffs?

Answer 76

Acetyl coA

Question 77

The amino acid Thr could correspond to the DNA segment ____

Answer 77

TGC

Question 78

The main fate of amino acids is the synthesis of

Answer 78

Protein

Question 79

The product obtained by the fermentation of wet cellulose is

Answer 79

Methane

Question 80

The process of heating milk and other liquids to destroy microorganisms that can cause spoilage or disease

Answer 80

Pasteurization

Question 81

Glucose contain which organic compounds?

Answer 81

Alcohol and Aldehyde