Question

question 1 which of these observations is qualitative rather than quantitative? a chemical reaction is complete in 2.3 s. the density of aluminum is 2.70 g/cm3. salt deposits form from an evaporated liquid. the solid has a mass of 23.4 g.

Explanation:

To determine if an observation is qualitative or quantitative, we note that quantitative observations involve numbers (measurements), while qualitative observations describe characteristics or phenomena without numbers.

• Option A: "2.3 s" is a numerical measurement (time), so it's quantitative.
• Option B: "2.70 g/cm³" is a numerical measurement (density), so it's quantitative.
• Option C: "Salt deposits form from an evaporated liquid" describes a phenomenon (formation of salt deposits) without using numbers, so it's qualitative.
• Option D: "23.4 g" is a numerical measurement (mass), so it's quantitative.

Answer:

C. Salt deposits form from an evaporated liquid