PHYSICAL SCIENCE Quiz

Amino acids are the building blocks of proteins. Each amino acid has a central carbon atom attached to a hydrogen atom, an amino group (NH2), a carboxyl group (COOH), and a variable side chain (R group). The side chain varies among different amino acids, giving each its unique properties. What makes an amino acid unique from one other?

• The form of attachment

• The different side chains

• The manner of peptide bonding

• The presence of acids and bases

What conditions must be met for a chemical reaction to occur?

• Collision with proper orientation

• Sufficient activation energy

• Adding more reactant particles

• Both collisions with proper orientation and sufficient energy

Pick two (2) options that will INCREASE the rate of reaction.

• a. reducing heat

• b. adding heat

• c. adding a catalyst

• d. removing catalyst

Which of the following gases are major components of a star?

• a. carbon and oxygen

• b. helium and carbon

• c. hydrogen and carbon

• d. hydrogen and helium

During star formation, heavier elements are synthesized through nuclear fusion processes in the cores of stars and during supernova explosions. Which of the following statements regarding the formation of heavier elements during star formation is TRUE?

• a. The fusion of lighter elements into heavier ones occurs primarily during the red giant phase.

• b. Heavier elements are primarily formed during the main sequence phase of a star's life.

• c. Elements heavier than iron are exclusively produced in the cores of massive stars.

• d. Elements heavier than iron are synthesized in supernova explosions.

The nuclear fusion process occurring in the core of our Sun involves hydrogen nuclei combining to form helium nuclei, releasing immense amounts of energy in the form of light and heat. Which of these is the nuclear fusion process?

• a. Proton-Proton Chain

• b. Carbon Cycle

• c. Tri-Alpha Process

• d. Calvin Cycle

Which element is the lightest and at the same time the most abundant in outer space?

• a. helium

• b. hydrogen

• c. iron

• d. lithium

Which of the following statements is INCORRECT?

• a. Polar covalent bond can be present in a nonpolar molecule.

• b. Polar bond forms when electrons are unequally shared by two atoms in a compound.

• c. Polarity of bonds and molecular geometry are the two factors that affect the polarity of molecules.

• d. Polar covalent bond is present if the electronegativity difference between atoms is equal to or less than 0.4.

Which of the following (intermolecular forces of attraction) IMFAs is considered the weakest?

• a. Ion-dipole

• b. H-bonding

• c. Dipole-dipole

• d. London Dispersion forces

Liquids can form spherical elastic film to minimize surface area. What intermolecular forces are responsible for the formation of this film in water?

• a. dipole-induced dipole

• b. H-bonding

• c. ion-induced dipole

• d. London dispersion forces