CSS - PMS - CCE - PCS - General Science
Periodic Table - Groups & Periods
Which group contains the alkali metals?
A. Group 17
B. Group 1
C. Group 2
D. Group 18
Correct Answer: B
Group 1 contains Li, Na, K and other alkali metals, excluding hydrogen's special classification.
CSS - PMS - CCE - PCS - General Science
Periodic Table - Groups & Periods
Elements in the same group often have similar chemical properties because they have similar what?
A. Physical sizes only
B. Valence-electron configurations
C. Neutron counts
D. Mass numbers
Correct Answer: B
Shared outer-electron patterns give group members similar chemistry.
CSS - PMS - CCE - PCS - General Science
Periodic Table - Groups & Periods
What are the horizontal rows in the periodic table called?
A. Periods
B. Groups
C. Orbitals
D. Families only
Correct Answer: A
Horizontal rows are periods.
CSS - PMS - CCE - PCS - General Science
Periodic Table - Groups & Periods
What are the vertical columns in the periodic table called?
A. Groups
B. Shells
C. Blocks only
D. Periods
Correct Answer: A
Vertical columns are groups.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
What property describes polymers that can stretch and return toward their original shape?
A. Atomic number
B. Elasticity
C. Radioactivity
D. Magnetization only
Correct Answer: B
Elastomeric polymers can undergo substantial reversible deformation.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
Which synthetic polymer is used to make nylon fibers?
A. Starch only
B. Natural DNA
C. Cellulose only
D. Nylon
Correct Answer: D
Nylon is a family of synthetic polyamides widely used in fibers and engineering materials.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
What is condensation polymerization?
A. A process that makes atoms vanish
B. Polymerization that always occurs below 0°C
C. Only gas molecules condense
D. Polymer formation accompanied by elimination of small molecules such as water
Correct Answer: D
Condensation polymers form stepwise and often release small molecules.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
What is addition polymerization?
A. Monomers join without eliminating a small molecule, often by opening multiple bonds
B. Only salts crystallize
C. A polymer breaks completely into atoms
D. A metal is oxidized
Correct Answer: A
In addition polymerization, unsaturated monomers add together directly.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
DNA is a polymer built from what monomers?
A. Nucleotides
B. Glucose only
C. Fatty acids
D. Amino acids
Correct Answer: A
DNA consists of chains of nucleotide units.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
Proteins are polymers whose monomers are what?
A. Amino acids
B. Nucleotides only
C. Fatty acids only
D. Simple metals
Correct Answer: A
Proteins are polypeptides built from amino acid monomers.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
Which natural polymer is the main structural material in plant cell walls?
A. Polyethylene
B. Polystyrene
C. PVC
D. Cellulose
Correct Answer: D
Cellulose is a natural polysaccharide polymer that strengthens plant cell walls.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
Which polymer is formed from ethene monomers?
A. Cellulose from ethene
B. PVC from chlorine gas only
C. Polyethylene
D. Nylon from glucose only
Correct Answer: C
Ethene undergoes addition polymerization to form polyethylene.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
What is a monomer?
A. A catalyst that cannot react
B. A neutron
C. A small molecule that can join with others to form a polymer
D. A finished polymer chain only
Correct Answer: C
Monomers are molecular building blocks of polymers.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Polymers
What is a polymer?
A. A metal alloy only
B. A single proton
C. A large molecule made of repeating structural units
D. A simple noble gas
Correct Answer: C
Polymers are macromolecules built from repeating units derived from monomers.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Plastics
Which principle is most directly promoted by reducing single-use plastics?
A. Burning all plastics in open air
B. Increasing unnecessary packaging
C. Waste prevention at the source
D. Mixing hazardous waste with food
Correct Answer: C
Reducing consumption prevents waste generation before reuse or recycling is needed.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Plastics
Which plastic is commonly used for beverage bottles?
A. Kevlar only
B. Natural rubber only
C. Bakelite only
D. PET
Correct Answer: D
PET is widely used for beverage and water bottles.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Plastics
Which recycling symbol identifies PET plastic in common resin codes?
A. 5
B. 2
C. 1
D. 7
Correct Answer: C
PET, polyethylene terephthalate, is commonly labeled resin identification code 1.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Plastics
What are microplastics?
A. Only plastic molecules visible as gas
B. Plastic pieces larger than 5 m
C. Very small plastic particles, commonly defined as less than 5 mm
D. Metal particles coated with paint
Correct Answer: C
Microplastics are plastic fragments or particles smaller than about 5 millimeters.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Plastics
What is one major environmental problem associated with many conventional plastics?
A. They persist for long periods because they degrade slowly
B. They evaporate instantly
C. They always improve soil fertility
D. They contain no carbon
Correct Answer: A
Many petroleum-derived plastics are resistant to natural degradation and can accumulate in ecosystems.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Plastics
Polyethylene is commonly produced from which monomer?
A. Ethene (ethylene)
B. Ethanol
C. Ethanoic acid
D. Methane
Correct Answer: A
Ethene molecules undergo addition polymerization to form polyethylene.