1. lisa had 20 grams of water. she poured out 15 grams. which of the following physical properties of the water changes?
a. boiling point
b. density
c. electrical conductivity
d. volume

2. a substance that is dissolved in another substance is which of the following?
a. saturation
b. solubility
c. solute
d. solvent

3. which of the following reasons explains why if salt water is heated, the water turns into steam while the salt remains?
a. water and salt have an equal boiling point
b. water has a lower boiling point than salt
c. salt has a lower boiling point than water
d. salt and water have an equal melting point

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.