First, I put vinegar in a bottle. Then, I added baking soda into a balloon.

When I mixed them, a gas formed and the balloon got bigger.

It was fun and interesting.

I used vinegar and baking soda.

When I mixed them, a gas called carbon dioxide filled the balloon.

I learned that a chemical reaction can make gas.

It was easy and fun.

Then place the bottle in hot water. The balloon starts to inflate.

After that, place the bottle in cold water. The balloon deflates.

Explanation:

When the air inside the bottle is heated, it expands and fills the balloon.

When it cools down, the air contracts, so the balloon shrinks.

This experiment shows a chemical reaction. We mix baking soda and vinegar to make a fun eruption. This creates carbon dioxide gas, which makes the bubbles. We add coffee to make the "lava" look brown and realistic. It also smells very good!

Why
Soap changes the water’s surface tension, so the black pepper moves away.

My Opinion
The experiment was very fun, and I was very surprised.

In this experiment, we see how sugar dissolves in hot and cold water.
We take two glasses, one with hot water and one with cold water. We add the same sugar to both and stir.
We notice that sugar disappears faster in hot water. This happens because hot water moves faster, helping the sugar mix quickly.
So, warmer water makes sugar dissolve faster.

In this experiment, we compare how sugar dissolves in hot water and cold water.

First, we take two glasses. One is filled with hot water and the other with cold water. Then, we add the same amount of sugar to both glasses and stir them equally.

We observe that sugar dissolves faster in hot water than in cold water. This is because the molecules in hot water move faster, which helps the sugar break down and mix more quickly.

In conclusion, temperature affects the rate of dissolving. Higher temperature makes substances dissolve faster.

First, I took  a candle and lit it. I covered the candle with the glass jar. The candle went out because there wasn't enough oxygen inside. It was a fun experiment.

First, I took a candle and lit it.

Then I placed a small glass bowl on top of the candle.

The candle went out because no oxygen entered. It was a fun and surprising experiment.

This experiment helps us observe the role of oxygen in burning.

Materials for this experiment:

A candle, a glass cup and a lighter.

Firstly, light the candle. Then turn the glass cup upside-down and put it on the candle. After a few minutes, you can see the candle slowly goes out.

Result:

Candle uses the oxygen around it while burning. When the cup is placed over the candle, no oxygen cam enter the cup, so the burning stops and candle goes out. This experiment shows that oxygen is necessary for burning. This experiment is simple, fun and educational!

Purpose of the experiment: This experiment demonstrates how chemical substances change color according to their pH value. Materials used: Red cabbage, hot water, clear glasses, lemon juice, baking soda, vinegar, dishwashing liquid.

Instructions: Chop the red cabbage and let it sit in hot water for 15 minutes to obtain a dark purple liquid. Pour this purple liquid over glasses containing different chemical substances (lemon juice, baking soda water, etc.).

Result of the experiment: Each substance has a different pH value. Therefore, they all turned different colors. Substances with a pH value between 0-7 (Acids) are red or pinkish, while those with a pH value between 7-14 (Bases) are blue or greenish.

How did we do it?

• Step 1: First, we measured the mass of our object using an equal-arm balance and found it to be 200 grams (g).

• Step 2: To find the volume of the object, we dropped it into a graduated cylinder filled with water. Based on the amount of displaced water, we measured its volume as 200 milliliters (ml).

• Step 3: We used one of the basic formulas of science: "Density = Mass / Volume". By calculating 200 g / 200 ml, we found the density of our object to be 1 g/ml.

Through this experiment, our students successfully transformed their theoretical science and math knowledge into a real-life problem-solving skill!

Raffaela, Domenico, Francesco e Chiara