Exam Questions and Correct
Answers | New Update
All organisms are composed of what? - 🧠 ANSWER ✔✔Matter
Matter is - 🧠 ANSWER ✔✔anything that takes up space and has mass
What is an element? - 🧠 ANSWER ✔✔substance that cannot be broken
down to other substances by chemical reactions
what is a compound? - 🧠 ANSWER ✔✔substance consisting of 2 or more
elements
,How many elements are essential to life? - 🧠 ANSWER ✔✔About 25 of the
92
What 4 elements make up 96% of living matter? - 🧠 ANSWER ✔✔carbon,
hydrogen, oxygen, nitrogen (CHON)
What 4 elements make up the remaining 4% of living matter? - 🧠 ANSWER
✔✔calcium, phosphorus, potassium, sulfer (CaPKS)
What is an atom? - 🧠 ANSWER ✔✔smallest unit of matter that still retains
the properties of an element
What are the 3 subatomic particles? - 🧠 ANSWER ✔✔protons+, neutrons,
electrons-
What 2 subatomic particles are found in the nucleus? - 🧠 ANSWER
✔✔Protons+, neutrons
What is the mass of protons and neutrons? - 🧠 ANSWER ✔✔1 Dalton (Da)
What is an atomic number? - 🧠 ANSWER ✔✔amount of protons in an atom
What is a mass number aka atomic mass? - 🧠 ANSWER ✔✔sum of protons
and neutrons
, What is an isotope? - 🧠 ANSWER ✔✔atoms with a different number of
neutrons
What is a radioactive isotope? - 🧠 ANSWER ✔✔nucleus of an isotope
spontaneously decays off particles and energy
What are 3 things we use radioactive isotopes for in biological research? -
🧠 ANSWER ✔✔Dating fossils, tracing atoms through metabolic processes,
diagnosing medical disorders
How is energy defined? - 🧠 ANSWER ✔✔capacity to cause change by
doing work
What is potential energy?** - 🧠 ANSWER ✔✔energy that matter possesses
because of its location or structure
How to electrons have potential energy? - 🧠 ANSWER ✔✔because of how
they are arranged in relation to the nucleus
What ratio of location to potential energy do electrons have?** - 🧠
ANSWER ✔✔more distant from the nucleus the greater potential energy
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