Question

a student wants to conduct an investigation that will determine a physical property of an unknown substance. which of these procedures would best measure a physical property of the unknown sample? a 1 using tongs, hold the sample over a flame 2 observe if the sample catches on fire 3 record your observations b 1 break the sample into a fine powder 2 add the powder to a 500 ml beaker 3 add 300 ml of water to the beaker and use to stirring rod to mix 4 using a dropper, add 4 drops of universal ph indicator to the solution 5 observe any color change in the sample 6 record your observations c 1 create an acidic solution by adding 5 ml vinegar to 100 ml water 2 place the sample into the acidic solution 3 observe if the sample begins to fizz in the solution 4 record your observations d 1 place the sample in a resealable, zip - top bag 2 firmly close the zip - top bag 3 lightly tap the sample with a hammer 4 observe if the sample dents, breaks, or shatters

Explanation:

Options A - C involve chemical - like reactions (burning, pH testing, reaction with acid). Option D tests a physical property (hardness or brittleness) by observing how the sample responds to mechanical force without changing its chemical composition.

Answer:

D. 1 Place the sample in a resealable, zip - top bag
2 Firmly close the zip - top bag
3 Lightly tap the sample with a hammer
4 Observe if the sample dents, breaks, or shatters