Question

unknown liquids data
sample indicator color change identification
unknown 1 litmus paper red acid
unknown 2 litmus paper pink acid
unknown 3 litmus paper pink acid
unknown 4 litmus paper blue base

1. students conducted an investigation to determine if unknown liquids were acids or bases. what was the independent variable in this investigation?

a. ? sample
b. ? indicator
c. ? color change
d. ? identification

1. a student suspects that there is a relationship between the amount of sunny weather in a given state and the amount of solar energy used by its inhabitants. in order to find out if this idea is correct, the student will need which information for each state?

a. ? the efficiency of solar technology used in that state
b. ? the location and type of solar cells used in that state

Explanation:

9.

The independent variable is what is changed in an experiment. Here, different samples of unknown liquids are used. The indicator (litmus paper) is kept the same. Color change and identification are dependent on the sample and indicator interaction. So the sample is the independent variable.

To find the relationship between sunny - weather amount and solar - energy use, we need to know the amount of sunny weather and the amount of solar energy used. Efficiency of solar technology, location and type of solar cells are not directly related to the relationship between sunny weather and solar - energy use by inhabitants. We need data on the amount of sunny weather and the amount of solar energy used in each state. But among the given options, none is completely correct. If we assume that the amount of solar energy used can be related to the efficiency of solar technology to some extent (as higher efficiency might lead to more use with the same amount of sunlight), the best option is the efficiency of solar technology used in that state.

Answer:

A. Sample

10.