Chemistry Challenges
Calculate the molar mass of NaCl (sodium chloride) to the nearest whole number (Na = 23 g/mol, Cl = 35.5 g/mol).
What is 58.5 g/mol?
These tectonic plates meet at the “Ring of Fire,” where volcanic activity is frequent.
What are the Pacific tectonic plates?
This is the term for the rate of change of velocity over time.
What is acceleration?
This process allows organisms to maintain stable internal conditions despite external changes.
What is homeostasis?
This scientist developed the first vaccine for smallpox, effectively launching the practice of vaccination.
Who is Edward Jenner?
In a solution, if you dissolve 5 moles of NaCl in 2 liters of water, what is the molarity of the solution?
What is 2.5 M (molar)?
This is the term for the preserved remains or traces of ancient organisms found in sedimentary rock layers.
What are fossils?
An object in freefall near Earth accelerates at approximately this rate, assuming no air resistance.
What is 9.8m/s^2?
Identify the stage in cellular respiration where glucose is broken down in the cytoplasm to form pyruvate, releasing a small amount of ATP.
What is glycolysis?
Marie Curie was awarded two Nobel Prizes in different scientific fields. Name both fields.
What are physics and chemistry?
Balance the following chemical equation: ___ C₃H₈ + ___ O₂ → ___ CO₂ + ___ H₂O.
What is 1 C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O?
Explain how igneous rocks form and give one example.
Igneous rocks form from the cooling and solidification of magma or lava; examples include basalt or granite.
If a car travels 40 m in 5 seconds, calculate its average speed.
What is 8m/s?
What are the three components of a DNA nucleotide?
What are a phosphate group, a deoxyribose sugar, and a nitrogenous base?
Identify the discovery made by Watson and Crick in 1953 that revolutionized the field of genetics
What is the double helix structure of DNA?
Calculate the number of grams in 0.25 moles of H₂O (molar mass of H₂O = 18 g/mol).
What is 4.5 grams?
The redshift of light from distant galaxies provides evidence for this scientific theory.
What is the Big Bang Theory?
Calculate the kinetic energy of a 10 kg object moving at 5 m/s
What is 125 J (joules)?
If a trait is controlled by a dominant allele, what percentage of offspring will express it if one parent is homozygous recessive and the other is heterozygous?
What is 50%?
The Michelson-Morley experiment disproved the existence of this theoretical medium, leading to major advancements in physics.
What is the ether?
In a lab reaction, you start with 10 grams of hydrogen gas (H₂) and react it with excess oxygen to form water (H₂O). How many grams of water can theoretically be produced? (H₂ = 2 g/mol, H₂O = 18 g/mol)
What is 90 grams?
Calculate the density of a mineral sample that has a mass of 240 grams and a volume of 60 cm³.
What is 4 g/cm³?
A 60-W light bulb operates at 120 volts. Calculate the current in amps flowing through the light bulb.
What is 0.5A?
Explain the role of ribosomal RNA (rRNA) in the process of protein synthesis.
What is to form part of the ribosome structure and facilitate the translation of mRNA into a polypeptide chain?
This concept describes how traits are passed from parents to offspring and was initially studied using pea plants by this scientist.
What is genetics/heredity, and who is Gregor Mendel?