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WorksheetsPre-Summative in PS
Total questions: 50
Worksheet time: 38mins
Which of the following is NOT an evidence of star formation?
hydrogen
helium
infrared Radiation
rocks
Which process produced Star’s energy?
combustion
decomposition
nuclear fission
nuclear fusion
Which of the following will sun’s evolve when reaches the end of red giant phase?
black hole
supernova
red super giant
white dwarf
These are the biggest stars in the universe.
main sequence star
red giant
red super giant
white dwarf
Which of the following gases are major components of star?
carbon and oxygen
helium and carbon
hydrogen and carbon
hydrogen and helium
Which of the following statements is FALSE?
The core of red giant star is made up of carbon
The average star has shorter life span
The more massive the star is the faster it burns its fuel
No elements heavier than Iron can be produced in a massive star
Which is the first stage of a star’s life cycle?
black hole
nebula
protostar
white dwarf
In main sequence star, Hydrogen fuses and converted to Helium and Helium is converted into ________ at its core.
carbon
iron
neon
silicon
This element is produced through Big Bang Nucleosynthesis second most abundant element in the universe.
carbon
helium
hydrogen
oxygen
What object is formed from gas and dust particles which are pulled together by gravity and no nuclear fusion has happened yet?
nebula
main sequence star
protostar
red supergiant star
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.
Microscope
Particle Accelerator
Particle Decelerator
Telescope
It is a one-dimensional point which contains a huge mass in an infinitely small space.
Dilation
Nucleosynthesis
R-process
Singularity
He noticed that shooting electrons at elements caused them to release x-rays at unique frequencies.
Mendeleev
Millikan
Moseley
Serge
He synthesized element with atomic number 43 using a linear particle accelerator.
Ernest Rutherford
Ernest Lawrence
Dmitri Mendeleev
John Dalton
This is known as the origin of light elements.
Stellar Nucleosynthesis
Primordial Nucleosynthesis
R-Process
Supernova Nucleosynthesis
Process that can produce elements up to #83 - Bismuth.
Nuclear Fission
R-Process
S Process
T Process
In this process, there’s a buildup of a VERY heavy isotope, then as beta-decays occur, you march up in atomic number and produce heavy product.
S Process
R-Process
Nuclear Fission
Proton-Proton Reaction
It was created by bombardment of molybdenum by deuterons (heavy hydrogen, H12), by Emilio Segre and Carlo Perrier in 1937.
Oxygen
Helium
Technetium
Uranium
These are elements with atomic numbers beyond 103.
Super Heavy Elements
Gases Elements
Lightest Element
Halogens
Which of the following statements is true for a 25Mg+2 cation?
it has 12 protons, 14 electrons, and 12 neutrons
it has 12 protons, 10 electrons, and 12 neutrons
it has 12 protons, 10 electrons, and 13 neutrons
it has 24 protons, 12 electrons, and 24 neutrons
none of the these
Which of the following molecules DO NOT have polar covalent bonds?
NH3
CS2
BCl3
HBr
Which of the following bonds is the MOST polar?
H-Cl
C-Cl
H-H
N-F
What is the molecular shape of CHBr3?
Linear
Tetrahedral
Trigonal planar
Trigonal bipyramidal
Which of the following pairs of atoms would form a nonpolar covalent bond?
P-N
C-S
Ca-O
Na-Cl
From the given Lewis structure of NH3, how many nonbonding pair/s of electron are around the central atom?
0
1
2
3
Which of the following statements is INCORRECT?
Polar covalent bonds can be present in a nonpolar molecule.
Polar bond forms when electrons are unequally shared by two atoms in a compound.
Polarity of bond and molecular geometry are the two factors that affect the polarity of molecules.
Polar covalent bond is present if the electronegativity difference between atoms is equal or less than 0.4.
What do you call the relative ability of a bonded atom to attract shared electron pairs?
Electron affinity
Electronegativity
Ionization energy
Metallic property
Which description below correctly describes polar molecules?
Have polar bonds present.
The polar bonds are arranged so that they do not cancel.
Lone pairs on the central atom are arranged so that they do not cancel.
Lone pairs on the central atom are arranged so that they can be cancelled out.
Which of the following molecules is tetrahedral?
BF3
SF6
CH4
H2O
Which of the following is NOT TRUE about CO2?
Is a polar molecule
Polar bond is present
Has a linear molecular shape
Has an electronegativity difference of 1.0
S and O are bonded by a polar covalent bond because its electronegativity difference value is 1.0.
True
False
Atoms with high electronegativity have a greater tendency to attract electrons toward itself.
True
False
Polarity of molecules are determined both by polarity of bonds and molecular geometry.
True
False
Among C-Cl, H-Cl, C-H and Cl-Cl, only Cl-Cl is polar.
True
False
Methyl alcohol, CH3OH, is a nonpolar molecule.
True
False
Which of the following (intermolecular forces of attraction) IMFAs is considered as the weakest?
Ion-dipole
H-bonding
Dipole-dipole
London forces
. The boiling point of water is greater than dihydrogen sulfide (H2S). This is because of the presence of what type of intermolecular forces of attraction?
Ion-dipole
H-bonding
London dispersion
Dipole-dipole bond
Which of the following substances will dissolve most likely in water?
I. Oil
II. Hexane (C6H14)
III. Vinegar (CH3COOH)
IV. Carbon tetrachloride (CCl4)
I only
I and II only
III only
III and IV only
By principle, polar molecules have a relatively high melting point than non-polar molecules because they have a stronger intermolecular force. Which of the following molecules has high melting point?
BCl3
CCl4
BeCl2
CHCl3
It is the energy required to increase the surface area of a substance by a unit amount.
Density
Viscosity
Vapor pressure
Surface tension
Which of the following statements is TRUE about nonpolar molecules?
Have high boiling point
Have high melting point
Have low surface tension
Have low vapor pressure
Which of the following substances is miscible in hexane (C6H14)?
Acetone (C3H6O)
Methanol (CH3OH)
Chloroform (CHCl3)
Vinegar (CH3COOH)
From the choices below, which is NOT an example of intermolecular forces of attraction?
H-bond
Dipole-dipole
Covalent bond
London forces
Which of the following properties has indirect relationship with the strength of IMFA?
Boiling point
Melting point
Vapor pressure
Surface tension
In which of the following solvents would molecular iodine (I2) be most soluble?
Water ( H2O)
Vinegar (CH3COOH)
Ethyl alcohol (C2H5OH)
Carbon tetrachloride (CCl4)
H-bonds are broken when ice melts.
True
False
Molecules with H-bonds have higher boiling point than molecules with dipole-dipole bond.
True
False
In covalent molecules, vapor pressure decreases with decreasing strength of intermolecular forces.
True
False
When the attractive forces holding particles together are greater, you have to get to a higher temperature to break those forces, so the melting point is higher.
True
False
The strength of dispersion (London) forces tends to increase with increased molecular weight
True
False
