What is the most abundant element in the universe?
Chemistry - 2nd Quarter Review

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Chemistry
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9th - 12th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
Hydrogen
2.
FLASHCARD QUESTION
Front
What are isotopes?
Back
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. Examples include Carbon-12, Carbon-13, and Carbon-14.
3.
FLASHCARD QUESTION
Front
How do you balance the equation P4 + O2 → P4O6?
Back
The balanced equation is P4 + 3O2 → P4O6.
4.
FLASHCARD QUESTION
Front
What is 0.00432 in scientific notation?
Back
4.32 x 10^-3
5.
FLASHCARD QUESTION
Front
How many O2 molecules are needed to balance the equation 2C2H6 + ___O2 → 4CO2 + 6H2O?
Back
7
6.
FLASHCARD QUESTION
Front
Define atomic number.
Back
The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.
7.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.
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