Physci Flashcards
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
d. No elements heavier than Iron can be produced in a massive star
- 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.
b. The alpha process then fuses helium (He) with carbon to make denser elements, but only those with an even number of protons.
- 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
d. Hydrogen bonding – dipole-dipole – London forces
- 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
b. Technetium
Which of the following bonds is the MOST polar?
a. H-Cl
b. N-F
c. C-Cl
d. H-H
b. N-F
- 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
d. big bang nucleosynthesis
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
b. It is the process of creating new atomic nuclei from pre-existing nuclei
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
d. Reactant
. 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. lipids
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
d. decrease only
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.
b. Particles in the substance must collide and have enough energy.
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
c. collagen
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
d. Increasing the volume
Which organic molecule gives fast source of energy?
a. lipids
b. carbohydrates
c. nucleic acids
d. proteins
b. carbohydrates
. 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
b. Attraction between an ion and a polar molecule.
- 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
d. c-s
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.
- c
- a.
- c
20 b - b
- Which element will be formed when Carbon (C)
atom is combined with Helium (He) atom?
a. Oxygen
b. Sulfur
c. Neon
d. Magnesium
a. oxygen
- 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
- 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
d
- 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.
b
- 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.
b