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Chemistry
Unit 5 6th grade chemistry
| Term | Definition |
|---|---|
| Mass | the amount of matter (atoms) in an object |
| Volume | the amount of space an object takes up |
| Matter | anything that has both mass and volume |
| Density | the amount of something in a particular space, how close together the atoms are in something (density = mass/volume, units are g/cm^3 or g/mL) |
| Atom | the smallest unique piece of matter/ smallest piece of an element |
| Element | something made up of only one kind of atom (example: O2, Na) |
| Molecule | something made of two or more atoms (example: O2) |
| Compound | something made of two or more elements (example: H2O) |
| Proton | positive pieces of an atom (found in the nucleus, they give the atom mass) |
| Nucleus | Center part of an atom, made up of protons and neutrons |
| Neutrons | neutral pieces of an atom (no charge - found in the nucleus, they give the atom mass) |
| Electrons | negative pieces of an atom, found circling around the nucleus (very light - they have a very small mass) |
| Chemical formula | A way to show the number of atoms of each element in a chemical compound or molecule |
| Subscript | the small number that shows how many atoms there are of the element it comes after (Example: H2O = 2 hydrogens, 1 oxygen) |
| Chemical Property | a quality of something that is only seen when it goes through a chemical reaction (example: flammability) |
| Physical Property | a quality of something that can be seen or measured without chemically changing it (example; hardness) |
| Physical change | changing the appearance of something but not its chemical structure (example: tearing paper) |
| Chemical change | a change that causes the chemical structure to change into something different (example: lighting paper on fire --> turns to ash and is no longer paper) |
| Freezing | when a liquid loses thermal energy and turns into a solid |
| Melting | when a solid gains thermal energy and turns into a liquid |
| Condensation | when a gas loses thermal energy and turns into a liquid |
| Boiling/Evaporation | when a liquid gains thermal energy and turns into a gas |
| Synthetic material | anything man-made (started from natural resources) - example: bread, pencils, shoes, Takis |
Created by:
mparr01
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