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CHEM TEST
Mrs. Eisenlord
Question | Answer |
---|---|
Where all elements are listed | Periodic Table |
Smallest particle of an element | atom |
Center of an atom | nucleus |
Positively charged particles | protons |
Particles with no charge | neutrons |
Negatively charged particles located outside of the nucleus | electrons |
This is the same as the number of protons and electrons | atomic number |
Is the number of protons and neutrons added together | atomic mass |
Most elements fall under this category | metals |
Most elements are this phase at room temperature | solid |
Bromine and mercury are the only two of these on the Periodic Table | liquids |
O, Au and Na are all examples of this | chemical symbols |
Elements in a compound are chemically ___ | bonded |
Mixtures can always be | physically separated |
Compounds always have a chemical symbol with two or more | capital letters |
Atoms in this phase are tightly packed together | solid |
Atoms in this phase are loosely packed together and can flow past each other | liquid |
Atoms in this phase are spread out and fast moving | gas |
A liquid has no definite | shape |
A liquid has a definite | volume |
When multiple elements and compounds are physically mixed together | mixture |
Two elements that are chemically bonded | compound |
A gas has indefinite | shape and volume |
If a chemical symbol has more than one capital letter it must be a | compound |
When a gas turns into a liquid | condensation |
When a liquid turns into a solid | freezing |
When a solid turns into a liquid | melting |
When a liquid turns into a gas | boiling |
Which of these is an element: salt, oxygen or carbon dioxide | oxygen |
which of these is a mixture: water, silicon or sand | sand |
Which of these is a compound:water, carbon dioxide or baking soda | all of them |
Changes that do not create new substances and can be reversed | physical changes |
Changes that create new substances and can't be reversed | chemical changes |
The numbers in a chemical formula tell us the | ratio |
Symbol O | oxygen |
Symbol Na | sodium |
Symbol Nd | neodymium |
Symbol Fe | iron |
Symbol Au | gold |
Atomic number 7 | nitrogen |
Atomic number 19 | potassium |
Atomic number 74 | tungsten |
Atomic Number 22 | titanium |
Atomic number 28 | nickel |
Carbon's chemical symbol | C |
Platinum's chemical symbol | Pt |
Iron's chemical symbol | Fe |
Iodine's chemical symbol | I |
Sulfur's chemical symbol | S |