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A gas has mass and volume but not a definite shape. The particles in a gas are moving quickly and far apart in all directions. It fills the space it is given. An example of gas is smoke. Smoke is a gas you can usually see. Other examples could be helium, carbon dioxide, and nitrogen.

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A liquid is something that takes the shape of it's container. You can pass through it. Liquid has mass and volume and the particles are loosely packed together. For an example the stuff inside a glow stick is a chemical liquid. (from my experience)  Other examples could be soda, lemonade, and water.

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For a solid you can't pass through it. The particles are tightly packed together with little measurement. It has a definite shape and has volume and mass. An example could be crayon. Other examples of solids are ice, a dog (pug), and paper.

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The difference between qualitative and quantitative is that qualitative is observable and quantitative is measurable.

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Qualitative is when you observe things. I observed a book. A book is a solid, has words in it, it's blue, white, and black with a hint of yellow. It can also be a rectangular prism.

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Quantitative is measurable.I have measured and weighed the objects. The objects are slime, lotion, and a book.
the book is = 481.2g. 21cm is the w. 14 cm. is the length.

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Chemical changes are when something changes substance,color, odor, substance, temp., and ect.
A chemical change is the opposite of a physical change. An example of a chemical change is that when you eat you digest your food into a new substance.

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A physical change is when something stays the same form, substance, color, texture, temperature, length, and ect. For example breaking glass into pieces is a physical change because nothing changed the color, temp., or substance.