Scale, Proportion, and Quantity Flashcards
7 cards from real AZSCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Scale, Proportion, and Quantity flashcards as text
A scientist is comparing the size of a virus (about 100 nm) to a human cell (about 10 µm). Approximately how many times larger is the human cell than the virus?
Answer: 100 times larger
10 µm = 10,000 nm; 10,000 nm ÷ 100 nm = 100, so the human cell is 100 times larger than the virus.
A car travels 300 km in 3 hours at a constant speed. What is the proportional relationship between distance and time?
Answer: 100 km per hour
300 km ÷ 3 hours = 100 km/hour; this constant ratio represents a directly proportional relationship.
Which tool would a scientist use to accurately measure the mass of a small rock sample?
Answer: Balance scale or digital balance
Mass is measured using a balance or digital balance, which detects or compares the gravitational force on an object.
In an experiment, doubling the concentration of a reactant doubles the reaction rate. This relationship is best described as:
Answer: Directly proportional
When one quantity doubles and the other doubles as well, they share a directly proportional (linear) relationship.
What is the primary reason scientists worldwide use the International System of Units (SI)?
Answer: To ensure measurements are consistent and comparable across labs and countries
Standard SI units ensure that measurements can be reliably reproduced and compared by scientists anywhere in the world.
Which of the following demonstrates proportional thinking in an ecological context?
Answer: If the prey population doubles, the predator population is expected to increase proportionally
Predator-prey relationships often show proportional trends because more available prey can support a proportionally larger predator population.
A student graphs the growth of a plant over 5 weeks. The plant grew 2 cm per week consistently. Which statement best describes the proportional relationship?
Answer: Total growth is directly proportional to the number of weeks
A constant growth rate of 2 cm/week means total growth = 2 × weeks, which is a direct proportion.