Science Experiments

Archive for September, 2008

Question: Need help identifying independent variable, dependent variable, and the control for my experiment?

hey everybody! I am doing a science experiment and I need to identify the independent variable, dependent variable, and the control.

okay so here is the experiment:
What brand of soap foams the best when heated in the microwave?

procedure:
# Unwrap a bar of Ivory™ soap.
# Place the bar of soap on a paper plate or microwave-safe dish.
# Nuke your soap. Watch the soap closely to see what happens.
# Depending on microwave power, your soap will reach its maximum volume within 90 second to 2 minutes. If you microwave the soap longer (I went up to 6 minutes) nothing bad will happen, but the soap won’t continue to grow.
#Measure the length and width of the soap foam and record the data.
#Repeat the above steps with the two other brands of soap.

Materials:
* bar of Ivory™ soap, bar of Dove soap, and a bar of Olay soap
* paper plate or microwave-safe dish
* microwave oven
* electric circuit

so please help me identify the variables and control. Thank you

Answer: Independent variables answer the question “What do I change?”.
Dependent variables answer the question “What do I observe?”.
Controlled variables answer the question “What do I keep the same?”.

Control variable – things that stay the same – time, temp, paper plate, microwave power

Independent varialble – the thing your are testing – soaps

Dependent – bubbles/foam

The VARIABLES Song – Mr. Edmonds – Rock with the Jackson 5 “I’ll Be There” music theme !

Question: Which is better for “invisible ink”, baking soda or lemon juice?

I am doing a science project and my hypothesis question, Which makes invisible ink better? (as in, clearer and easier). I was thinking lemon juice (acid) or baking soda (base) to test. But if both do the same, then it won’t be much of a science experiment. I know I should go out and buy the ingrediants and make it myself, but please, if you know for absolute sure, tell me! This is very important! Thank you

Answer: lemon juice does work i used to have fun messing around with it as a kid as for the baking soda its hit or miss really.

Naked Scientists Dave Ansell invisible ink

Question: Science Project: Which materials can best keep an ice cube from melting? (ice cube conduction)?

In science class, we are to do a project on Heat Conduction. Our lab is to figure out which materials we can use to do the experiment: Ice Cube Conduction. I already have a list of possible things (good conductors):
Porcelain, bubble wrap, packing peanuts, stryo foam, duct tape (or just any tape), newspaper…?

Please tell me if I am on the right track so far!

( ohh yes, there was one experiment that said to wrap it in wax paper then newspaper. The line the sides with aluminum foil. Then to hang the ice cube so it doesnt hit the warm sides. Lastly to tape any of the open areas around the box, like openings.

PLEASE HELP ME!!!
Thanks for your support!!!

Answer: Maybe Air packaging it will keep it from melting.

Cool Science Ice Cube Necklace