physical vs chemical
This is one of the clearest signs that a chemical change has happened, like fizzing or foaming.
what is gas production ( or bubbles) ?
This is what the letters pH stand for on the acid-base scale.
What is potential of hydrogen?
These are the three main states of matter most kids learn about first.
What are solid,liquid, and gas?
This is why oil floats on top of water instead of mixing in a lava lamp.
What is oil is less dense than water?
This tool is used to pull iron filings out of a sand and iron filings mixture.
What is a magnet?
Crushing chalk into powder is this type of change, since it's still the same substance.
What is a physical change?
A liquid with a pH of 3 falls into this category.
What is an acid?
This is the name for a solid changing directly into a gas, skipping the liquid state completely.
What is sublimation ?
This gas, released by an Alka-Seltzer tablet, is what carries the colored water bubbles up through the oil.
What is carbon dioxide?
Adding water to a sand and salt mixture helps separate them because salt does this in water, but sand does not.
What is dissolve?
This gas is what makes baking soda and vinegar fizz, proving a new substance formed.
What is (Co2) ?
This is the special word for a substance, like red cabbage juice, that changes color to show acid or base.
What is an indicator?
This property of metal explains why an ice cube melts faster on it than on foam.
What is thermal conductivity?
Unlike a compound, the parts of this kind of substance can be separated by simple physical methods.
What is a mixture?
In chromatography, this is why the colors in a black marker separate as water travels up the paper.
What is each pigment travels at a different speed (based on size and solubility)
Melting an ice cube and then refreezing it is this type of change, because it's reversible.
What is a physical change?
Pure water has this many H+ ions compared to OH- ions.
What is an equal amount (they balance out)?
This is what happens to a balloon's size when it's placed in hot water, because the gas particles inside move faster.
This is what happens to a balloon's size when it's placed in hot water, because the gas particles inside move faster.
In a mixture, elements are NOT bonded together this way, unlike in a compound.
What is chemically?
This is the correct 4th and final step after using a magnet, dissolving salt, and filtering sand.
What is evaporating the water?
Even though rusting a nail takes days or weeks, it still counts as this type of change because a new substance (iron oxide) forms.
What is a chemical change?
If soapy water turns cabbage juice blue-green, this is what soap must be.
What is a base?
This is what happens to a balloon's size when it's placed in ice water.
What is it shrinks (gets smaller)?
This is why the lava lamp bubbles eventually sink back down after popping at the top
What is they become denser again once the gas escapes?
This is the process of pouring a mixture through paper to trap solid particles like sand.
What is filtering?