List the independent and dependent variables.
1: Topic 1: Which type of brand of chocolate melts fastest in the sun?
Independent Variable:
Dependent Variable:

2: Topic 2 How does a light bulb’s wattage affect the amount of heat detected above the light?
Independent Variable:
Dependent variable:

3: Topic 3: Which stain remover works the best?
Independent Variable:
Dependent variable:

4: Topic 4 What effect does temperature have on the elasticity of a rubber band?
Independent Variable:
Dependent variable:

5: Topic 5: Does the amount of water affect a rainbow?
Independent Variable:
Dependent variable:

6: Topic 6: Does music affect animal behavior?
Independent Variable:
Dependent Variable:

7: Topic 7 Does the color of a room affect the mood of the people in it?
Independent Variable:
Dependent variable:

8: Topic 8: Does cold storage affect the germination of seeds?
Independent Variable:
Dependent variable:

9: Topic 9 Does temperature affect the strength of a magnet?
Independent Variable:
Dependent variable:

10: Topic 10 How are plants affected by the distance between them?
Independent Variable:
Dependent variable:

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely. analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added