Science Gr 6 (Chapter 8)
Terms
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- Who was Antoine Lavoisier?
- French Chemist, no change in mass during common chemical reactions, such as: burning and rusting.
- Electron
- Negatively charged particles that are the lightest of the three main particles found in an atom.
- Compound
- A form of matter that is made when two or more elements combine.
- What is an example of a compound?
- H2O - Water which is Oxygen and Hydrogen combined.
- How is a compound represented?
- By a chemical formula.
- Mixture
- Two or more substances put together that DO NOT combined to form a compound.
- What is an example of a mixture?
-
Air - which contains oxygen, nitrogen and other gases.
Another example: rocks - What is Mass?
- Amount of matter in an object.
- Can Mass change?
- NO, Mass cannot change.
- What is a Proton?
- A positively charge particle located in the nucleus of an atom.
- ATOM
- An extremely small partical that is the basic unit of matter and is composed mainly of protons, neutrons and electrons.
- Democritus
- Greek philosopher who found out what an atom is and called it "stuff"
- Synthetic Element
- NOT an element found in nature. A synthetic element is man-made by a particle accelerator.
- How many synthetic elements are there?
- 21
- Natural Element
- An element found in nature. Example: copper, hydrogen, sodium, iodine
- How many natural elements?
- 91
- John Dalton
- English chemist that introduced a model to describe matter and atoms.
- Element
- Matter made up of only one type of atom. Example: gold
- How many elements are there?
- 112
- Model
- A smaller or larger version of something.
- Neutron
- A particle with NO charge.
- Nucleus
- The center of an atom which is made up of protons and neutrons.
- Particle Accelerator
- Machines that make synthetic elements.
- Chemical Formula
- Is made up of symbols and numbers that tell what elements are in a compound and what their ratios are.
- Joseph Proust
- French chemist, he stated that the basic building blocks of any substance are always the same.
- Matter
- used to describe anything that has mass and takes up space. Examples: Air, trees, buildings, people
- Is heat and light a form of matter?
- Heat and light are not a form of matter.
- Periodic Table
- A chart that organizes elements by the number of PROTONS in each elements nucleus. This also indicates if a element is a solid, liquid or gas.
- Dimitri Mendeleev
- Russian chemist who made the periodic table.
- Why do some elements have a three letter abbreviation?
- Until scientists around the world agree on the element it has a 3 letter abbreviation and then when agreed upon gets a 2 letter abbreviation.