The Invisible World
When vinegar and baking soda mix in a bag, it puffs up because it is being filled with this state of matter, which is made of moving particles.
What is a gas?
You can use this property to tell milk and glue apart, even though they are both white.
What is how easily they pour?
Dara used this common powder to test which juice was the strongest acid.
What is baking soda?
This metal leaves a dull coin as invisible particles and later reappears on a steel nail.
What is copper?
Julian's breath can fit through a tiny balloon opening because it is made of a huge number of these.
What are tiny particles?
Mixing milk and vinegar creates a new substance because the mixture forms these, which have totally different properties than the liquids.
What are white clumps?
Out of lemonade and tomato juice this one is the most acidic because it produces the most bubbles.
What is lemonade?
Maria cleaned her dull, brown 1 Euro cent using a tub filled with these two common ingredients
What are vinegar and salt?
This happens to the weight of a tub of vinegar and salt after dull brown bits are added and seem to "disappear".
What is it stays the same?
If Liquid A and Liquid B are both cloudy and gray, but they form a clear green liquid when mixed, this is the evidence that a new substance was created.
What is a change in properties?
When Dara tested water with baking soda, the result was "no bubbles," which proves that water has this property.
What is it is not an acid?
Maria could see the copper coin and the copper on the nail, but not the copper in the middle because the particles were in this state.
What is too small to see?
This is what gas particles are doing inside a puffed-up bag or balloon to keep it inflated.
What is flying around and pushing against the sides?
Omar mixed 10g of two liquids to get 20g total; this is why he is wrong to say the new weight proves it's a new substance.
What is because mass always adds up when substances are mixed?
Dara learned that orange juice and tomato juice are both types of this, even though she likes to drink them.
What are acids?
Even after dull brown bits are placed in vinegar and salt and become invisible to the eye, Maria knows they are still in the tub because of this reason.
What is the total weight on the scale stayed the same?