Elements/Materials
Please give one example of a natural material.
Wool, wood, leather, sand, etc.
This phase change happens when a solid turns into a liquid.
melting
Density is calculated using what formula?
Density = mass ÷ volume
The small building block that makes up a polymer is called a…
Monomer
Please give one example of a synthetic material.
glass, rubber, plastic, etc.
Water vapor in the air cools and forms liquid droplets on a window. This phase change is called…
Condensation
An object has a mass of 100g and a volume of 50cm³. What is its density?
2 g/cm³
What is the polymer name for Carboydrates?
polysaccharides
This type of material allows some light to pass through making it blurry.
Translucent
This phase change occurs when a solid turns directly into a gas without becoming a liquid first.
Sublimation
Two objects are made of the same material but have different sizes. Which object has the higher density?
Both have the same density because density does not depend on size.
A long chain of amino acids joined together is called
Polypeptide
A student places three materials in front of a flashlight.
Material A allows all light to pass through clearly. Material B allows some light through but scatters it. Material C blocks all light.
Classify Materials A, B, and C in order.
Transparent, Translucent, Opaque
During a phase change, the temperature of a substance stays the same even though heat is being added or removed. This point of balance is called…
Equilibrium
A metal cube has a mass of 512g and a density of 8g/cm³. What is its volume?
64 cm³
What is the main function for Nucleic Acids?
store and transmit genetic information
A scientist observes three substances:
Substance A has a shiny red color.
Substance B reacts with acid and produces bubbles.
Substance C formed rust.
Identify which property (physical or chemical) each observation represents.
A puddle of water slowly disappears on a warm day without boiling. This process is a phase change from liquid to gas. What is it called?
Evaporation
A cube has a mass of 216g and each side measures 6cm. What is the density of the cube?
1 g/cm³
This type of macromolecule is made mostly of glycerol and fatty acids, stores long-term energy, and helps form cell membranes. What is the name of the macromolecule? What is the name of its monomer & polymer?
The macromolecule is lipid. The monomer name is fatty acids. The polymer name is triglycerides.