Question

using only these supplies, which question can adele investigate with an experiment? does milk chocolate melt faster when heated in a microwave or on a stove? does milk chocolate or dark chocolate melt faster when heated on the stove? does dark chocolate or white chocolate melt faster when heated on the stove?

Explanation:

To determine which question Adele can investigate, we analyze the "using only these supplies" context (implied she has one type of chocolate or a single heating method? Wait, no—wait, the key is: for an experiment, the independent variable must be manipulable with the supplies. Wait, actually, the first question compares two heating methods (microwave vs stove) for milk chocolate. But if the supplies are, say, only milk chocolate and a stove (or only one heating method), but the other questions compare different chocolates (milk/dark, dark/white) with the same heating method. Wait, no—wait, the problem is about "using only these supplies"—so if the supplies include milk chocolate and a stove (and maybe microwave), but the first question is about milk chocolate with two methods. But the other two questions compare different chocolates (so she needs both types). So if the supplies are only milk chocolate, then the first question is possible (using microwave and stove on milk chocolate). Wait, no—let's re-express:

An experiment requires that the independent variable can be controlled. For the first question: independent variable is heating method (microwave vs stove), dependent is melting time, and the chocolate is milk (constant). So if she has milk chocolate, microwave, and stove, she can do this. The other two questions require two types of chocolate (milk/dark or dark/white), so if supplies are only one type, those can't be done. So the first question is investigable with an experiment (if supplies include milk chocolate, microwave, stove).

To conduct an experiment, the independent variable must be manipulable with available supplies. The first question (“Does milk chocolate melt faster when heated in a microwave or on a stove?”) uses milk chocolate (constant) and compares two heating methods (independent variable), which can be tested with a microwave, stove, and milk chocolate. The other questions require multiple chocolate types (milk/dark, dark/white), which would need those chocolates as supplies (not implied here). Thus, the first question is investigable.

Answer:

Does milk chocolate melt faster when heated in a microwave or on a stove?