Science Experiments

Posts Tagged ‘experiments’

Question: Why does it take water longer to freeze than milk or soda?

This is for a science experiment.
What properties in the milk and soda would cause it to have a lower freezing point than water? Our hypothosis was that the water would freeze faster but it didn’t.

Answer: Water has a higher specific heat capacity than milk or soda. What this means is that it take more energy to change the phase of water. One way to inject that energy into the process is to do it over time. Hence it takes longer for water to freeze.

See the link below.

Milk of Magnesia – Cool Science Experiment

Question: Anyone have good science project ideas? One that gets you a prize and for a kid in middle school?

I’m geting desperate and very frusterated on a good science project idea. It has to be an expiremental project. Make sure that its for a seventh, eigth, or maybe even a ninth grader! make sure it can get me a desent prize… at least 3rd place! Make sure it has nothing to do with experimenting with animals! Thanx!!!

Answer: Here are a few sites that should help you. Best of luck with your project.

Teaching Science in Middle School

Question: Grade 8 Science Experiment Question? Help Please.?

If anyone could help me out on these science questions, that would be great

1. When vinegar and baking soda react, carbon dioxide gas is produced. How do you know that the carbon dioxide flowed?

2. When carbon dioxide and air are put in the same container, where does the carbon dioxide go? Where does the air go?

If anyone can help answer these questions for me, that would be great!

Answer: 1. The reaction between baking soda and vinegar is actually two reactions, an acid base reaction followed by a decomposition reaction.

When the two ingredients are mixed, hydrogen ions ( H+) from the vinegar react with the bicarbonate ions (HCO3- ) from the baking soda to form a new chemical called carbonic acid (H2CO3).

The carbonic acid thus formed then immediately decomposes into carbon dioxide gas (CO2)and water (H2O).

It’s this carbon dioxide gas that you see bubbling and foaming as soon as you mix baking soda and vinegar together.

2. Carbon dioxide is heavier than air and so it sinks into the container and stays there. So the air stays up and carbon dioxide goes down. (Carbon dioxide = 44 g/mole and Air 29g/mole)

Zoom Sci: Baking soda-Vinegar Submarine