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2nd Semester > Physical Science > Flashcards

Physical Science Flashcards

1
Q
  1. 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

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.

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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 – dipoledipole
    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
  1. 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
  1. 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
  1. 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
  1. 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
  1. 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

b. decreases only

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11
Q
  1. 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
  1. 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
    d. pepsin
A

c. collagen

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13
Q
  1. 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
  1. 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
  1. 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 polar
    molecule.
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

a. Na-Cl

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

C Particle Size, A Temperature , C Particle Size, B Concentration, B Concentration

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

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 The (-) and (+) ends of one polar molecule align
themselves to the (+)and (-) ends of another
polar molecule and attract each other

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 Electronegativity

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

a. The first and second statements are true.

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
A

a There is a vague relationship between
intermolecular forces and bulk properties

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 H2O than CH4.
A

d. greater molar mass of H2O than CH4.

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

a. Length of the candle
b. Higher Oxygen concentration
c. Greater surface area of the jar
d. Increasing the surrounding temperature

25
Q
  1. 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
A

c. dipole-dipole

26
Q
  1. 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

a. Particle Accelerator

27
Q
  1. 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)
A

d. Vinegar (CH 3 COOH)

28
Q
  1. How do heavier elements formed?
    a. Through combustion
    b. Through nuclear fission
    c. Through nuclear synthesis
    d. Through nuclear fusion
A

d. Through nuclear fusion

29
Q
  1. Why are dispersion forces high in molecules with a great number of electrons?
    a. The nucleus in the molecules has a greater effective shielding effect.
    b. The electrons move freely around the nucleus resulting in 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.
A

d. The electron distribution of big molecules is easily polarized.

30
Q
  1. 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.
A

c. H-atoms attached to O, N, F.

31
Q
  1. 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. 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.

32
Q
  1. 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
A

b. Polar covalent

33
Q
  1. 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
A

d. dispersion forces

34
Q
  1. 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
A

b. increase

35
Q
  1. Which of the following is NOT TRUE about CO2?
    a. Has a linear molecular shape
    b. Has an electronegativity difference of 1.0
    c. Polar bond is present
    d. Is a polar molecule
A

d. Is a polar molecule

36
Q
  1. Which of the following is NOT an example of viscous
    substance?
    a. honey
    b. blood
    c. vinegar
    d. syrup
A

c. vinegar

37
Q
  1. Which molecular geometry is POLAR?
    a. b.

c. —-/-———- d.

A

C —-/-———-

38
Q
  1. 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
A

c. becomes denser when freezes

39
Q
  1. 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

b. They are present in metals.

2nd Semester (48 decks)

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