2nd Sem Midterm rev > Physci > Flashcards

Physci Flashcards

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1
Q

Which of the following statements is FALSE?
a. The core of red giant star is made up of carbon
b. The average star has shorter life span
c. The more massive the star is the faster it burns its fuel
d. No elements heavier than Iron can be produced in a massive star

A

d. No elements heavier than Iron can be produced in a massive star

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2
Q
  1. Which among the following statements is NOT TRUE?
    a. The Fusion reaction that happens inside the stars’ core as it converts hydrogen(H) into helium (He), heat, and radiation.
    b. The alpha process then fuses helium (He) with carbon to make denser elements, but only those with an even number of protons.
    c. Since the cosmos began, a few of the heavier elements in the universe were made when two neutron stars collided together and exploded with a mighty crash.
    d. Gravity happened to be at the wrong place and these atoms were pulled together into huge clouds of gas in the emptiness of space.
A

b. The alpha process then fuses helium (He) with carbon to make denser elements, but only those with an even number of protons.

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3
Q
  1. Which of the following intermolecular forces of attraction (IMFA) is arranged from strongest to weakest?
    a. Dipole-dipole – London forces – Hydrogen bonding
    b. Hydrogen bonding – London forces – dipole-dipole
    c. London-forces – dipole-dipole – Hydrogen bonding
    d. Hydrogen bonding – dipole-dipole – London forces
A

d. Hydrogen bonding – dipole-dipole – London forces

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4
Q
  1. It was created by bombardment of molybdenum by deuterons (heavy hydrogen, H12), by Emilio Segre and Carlo Perrier in 1937.
    a. Oxygen
    b. Technetium
    c. Helium
    d. Uranium
A

b. Technetium

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5
Q

Which of the following bonds is the MOST polar?
a. H-Cl
b. N-F
c. C-Cl
d. H-H

A

b. N-F

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6
Q
  1. Which process is responsible for the formation of light elements such as Hydrogen (H) and Helium (He)?
    a. supernova nucleosynthesis
    b. stellar nucleosynthesis
    c. terrestrial nucleosynthesis
    d. big bang nucleosynthesis
A

d. big bang nucleosynthesis

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7
Q

Which of the following is TRUE about nucleosynthesis?
a. It is the creation of everything including all matter in universe
b. It is the process of creating new atomic nuclei from pre-existing nuclei
c. It is the division of atomic particle
d. The combination of elements to form compound

A

b. It is the process of creating new atomic nuclei from pre-existing nuclei

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8
Q

The substance or particles that enter into and is altered in the course of a chemical reaction.
a. Catalyst
b. Enzyme
c. Product
d. Reactant

A

d. Reactant

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9
Q

. Which nutrient group is used in the composition of waxes and responsible for insulation of some organisms?
a. lipids
b. proteins
c. carbohydrates
d. nucleic acids

A

a. lipids

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10
Q

What happens to the surface tension of liquids as temperature increases?
a. remains the same
b. decreases only
c. may decrease or increase
d. increases only

A

d. decrease only

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11
Q

The condition that needs to be met for a chemical reaction to occur.
a. Substance must be homogeneous.
b. Particles in the substance must collide and have enough energy.
c. Temperature should be kept constant.
d. Particles should maintain a certain distance to each other.

A

b. Particles in the substance must collide and have enough energy.

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12
Q

This is a major insoluble fibrous protein found in connective tissues such as tendons, ligaments, skin, cartilage and the cornea of the eye. What is it?
a. albumin
b. keratin
c. collagen
p. epsin

A

c. collagen

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13
Q

Which of the following would NOT increase the rate of reaction?
a. Increasing the temperature
b. Adding catalyst
c. Increasing the concentrations
d. Increasing the volume

A

d. Increasing the volume

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14
Q

Which organic molecule gives fast source of energy?
a. lipids
b. carbohydrates
c. nucleic acids
d. proteins

A

b. carbohydrates

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15
Q

. Ion-dipole interaction results from the __________
a. Repulsion between a polar with a nonpolar molecule.
b. Attraction between an ion and a polar molecule.
c. Repulsion between a dipole and another dipole.
d. Attraction between a polar with another

A

b. Attraction between an ion and a polar molecule.

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16
Q
  1. A nonpolar covalent bond would form in which of
    the following pairs of atoms?
    a. Na-Cl
    b. Ca-O
    c. P-N
    d. C-S
A

d. c-s

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17
Q

17-21. Identify what factor affects the rate of chemical
reaction in the following situations. Use the choices
below.
a. Temperature
b. Concentration
c. Particle Size
17. A coal dust explosion happens in mines.
18. The food was refrigerated.
19. Kindling is used to start a fire.
20. Acid rain erodes marble fast.
21. Two antacid tablets neutralize acids faster than one tablet.

A
  1. c
  2. a.
  3. c
    20 b
  4. b
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18
Q
  1. Which element will be formed when Carbon (C)
    atom is combined with Helium (He) atom?
    a. Oxygen
    b. Sulfur
    c. Neon
    d. Magnesium
A

a. oxygen

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19
Q
  1. How does dipole-dipole interaction happen?
    a. The (-) and (+) ends of one polar molecule align
    themselves to the (+)and (-) ends of another
    polar molecule and attract each other
    b. Polar molecules shift electron density that gives
    rise to neutral substances.
    c. The electron distribution in the polar molecules
    is distorted that results to (-) and (+) poles.
    d. Polarization of big nonpolar molecules brings
    about the formation of permanent (+) and (-)
    charges.
A

a

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20
Q
  1. Which among the following terms refer to the ability
    of an atom in a molecule to attract shared electrons?
    a. Molecular polarity
    b. Covalent bonding
    c. Electron affinity
    d. Electronegativity
A

d

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21
Q
  1. Which among the following best describes the given
    statements?
    1st Statement - A molecule shape is a three-dimensional
    arrangement of atoms or bonding groups around a
    central atom.
    2nd Statement - The molecular shape is governed by
    the valence shell electron repulsion (VSEPR) theory.
    a. The first statement is false while the second
    statement is true.
    a. The first and second statements are true.
    b. The first statement is false while the second
    statement is true.
    c. The first statement is true while the second
    statement is false.
A

b

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22
Q
  1. What is true about intermolecular forces?
    a. There is a vague relationship between
    intermolecular forces and bulk properties.

b. They are strong bonds that form between
atoms of molecules.
c. Substances can form more than one but one
will predominate.
d. They are stronger than the intramolecular
forces between atoms.

A

b

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23
Q
  1. Methane will not dissolve in water due to
    ____________.
    a. difference in intermolecular forces between the
    two substances.
    b. the same intermolecular forces they possess.
    c. difference in the kinds of atoms in their
    structure.
    d. greater molar mass of H 2 O than CH 4 .
24
Q
  1. Why does a candle burn more rapidly when placed
    in an open jar than in air? What accounts for this
    reaction?
    a. Length of the candle
    b. Higher Oxygen concentration
    c. Greater surface area of the jar
    d. Increasing the surrounding temperature
25
29. Which of the IMF has attractive forces between polar molecules where the positive end of one molecule aligns to the negative end of another molecule a. ion-induced dipole b. ion-dipole c. dipole-dipole d. dispersion forces
b
26
30. It is a device that is used to speed up the protons to overcome the repulsion between the protons and the target atomic nuclei by using magnetic and electrical fields. a. Particle Accelerator b. Microscope c. Spectroscopy d. Particle Decelerator
a
27
31. Which of the following substances will dissolve most likely in water? a. Carbon tetrachloride (CCl 4 ) b. Oil c. Hexane (C 6 H 14 ) d. Vinegar (CH 3 COOH)
d
28
32. How do heavier elements formed? a. Through combustion b. Through nuclear fission c. Through nuclear synthesis d. Through nuclear fusion
d
29
33. Why are dispersion forces high in molecules with great number of electrons? a. The nucleus in the molecules has greater effective shielding effect. b. The electrons move freely around the nucleus resulting to greater energy. c. The electrons in the molecules can easily jump from one orbital to another. d. The electron distribution of big molecules is easily polarized.
30
34. H-bonding forms when the substances involved are polar and have molecules with a. Unshared pair of electrons in the central atom. b. C-atoms attached to O, N, F. c. H-atoms attached to O, N, F. d. Central atoms with O, N, F as attached atoms.
c
31
35. Which of the following statements is INCORRECT? a. Polar bond forms when electrons are unequally shared by two atoms in a compound. b. Polarity of bond and molecular geometry are the two factors that affect the polarity of molecules. c. Polar covalent bonds can be present in a nonpolar molecule. Polar covalent bond is present if the electronegativity difference between atoms is equal or less than 0.4.
a / c
32
36. Supposedly a hypothetical molecule has an electronegativity difference of 0.5, what is the type of chemical bond present? a. Hydrogen b. Polar covalent c. Ionic d. Nonpolar covalent
d
33
37. At any certain time the shift in the position of the electrons in an atom will likely create a temporary positive and negative pole. This is known as_________ a. dipole forces b. instantaneous dipole c. dipole moment d. dispersion forces
b
34
38. London dispersion forces are a function of the molar mass of substances. What happens to the dispersion forces of the molecules when the molar mass increases? a. cannot be measured b. increase c. remain the same d. decrease
b.
35
39. Which of the following is NOT TRUE about CO 2 ? a. Has a linear molecular shape b. Has an electronegativity difference of 1.0 c. Polar bond is present d. Is a polar molecule
d
36
40. Which of the following is NOT an example of viscous substance? a. honey b. blood c. vinegar d. syrup
c
37
41.
38
42. Which of the following is NOT TRUE about water? a. has low viscosity b. has high surface tension c. becomes denser when freezes d. has high boiling point
c
39
43. Which of the following statements is NOT TRUE about polar bonds? a. They may result to nonpolar covalent compounds depending on molecular geometry. b. They are present in metals. c. They may result to the formation of polar molecular compounds. d. They are responsible for the formation of ionic compounds.
a
40
44. Cohesive forces bring about capillary action. These forces are_____________________. a. pulling molecules towards gravity. b. drawing together of the same kind of molecules. c. interactions among polar molecules. d. attractions among different molecules.
d
41
45. Which of the following properties has indirect relationship with the strength of IMFA? a. Vapor pressure b. Boiling point c. Melting point d. Surface tension
d
42
46. Substances like heavy syrup and molasses flow more slowly than water. Which property is exhibited in the statement? a. Capillary action b. Pressure c. Viscosity d. Surface tension
c.
43
47. Which biomolecular group carries and passes on the hereditary information of the organism? a. carbohydrates b. nucleic acids c. lipids d. protein
b
44
48. Which of the following statements is TRUE about nonpolar molecules a. Have low surface tension b. Have high boiling point c. Have high melting point d. Have low vapor pressure
a
45
49. Juana, a grade 12 student experienced excessive sweating, frequent urination, feeling very thirsty and hungry. She was not able to attend her class during that day. She was rushed in the hospital and upon examining her blood sugar, it was found out that it is above its normal value. Which among the macromolecules should she take lesser in her daily diet after her experience? a. lipids b. nucleic acids c. carbohydrates d. proteins
c
46
50. Which of the following molecule is nonpolar? a. NaCl b. CO 2 c. NH 3 d. HCl
b
47
51. A heat of hydration is the result of favourable interaction between the cations and anions of an ionic compound with water. The nature of this attraction is __ a. ion-dipole forces b. dispersion forces c. h-bonding d. dipole-dipole interaction
a
48
52. Who among the following prominent people noticed that shooting electrons at elements caused them to release x-rays at unique frequencies? a. Edwin Mcmillan b. Henry Gwyn-Jeffreys Moseley c. Emilio Segre d. Ernest Rutherford
b
49
53. The boiling point of water is greater than dihydrogen sulfide because of ______. a. Dipole-dipole bond b. H-bonding c. London dispersion d. Ion-dipole
b
50
54. The excessive consumption of carbohydrates is converted into which polysaccharide that is stored in the liver and in muscles? a. hemoglobin b. creatinine c. uric acid d. glycogen
d
51
55. Which of the following pairs of atoms is bonded by nonpolar covalent bonding? a. Phosphorus (P) - Nitrogen (N) b. Carbon (C) - Sulfur (S) c. Sodium (Na) - Chlorine (Cl) d. Calcium (Ca) - Oxygen (O)
b
52
56. Which of the following is NOT an evidence of star formation? a. hydrogen b. rocks c. infrared radiation d. helium
b
53
57. Which of the following scenarios can help increase the formation of products in a chemical reaction? a. Decrease the temperature b. Make the particle size of the reactants larger c. Make the particle size of the reactants smaller d. Decrease the concentration of the reactants
c
54
58. How does a catalyst work in speeding up a reaction? a. by giving them more energy. b. by making them more available. c. by lowering the activation energy or reaction. d. by making polarity faster.
c
55
59. What do you call the substance that increases the rate of a reaction without being used up during the reaction? a. Catalyst b. Product c. Reactant d. Solute
a
56
60. Which is a good example of saturated fat? a. butter b. corn oil c. olive oil d. sunflower oil
am
2nd Sem Midterm rev
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