Q: The complete combustion of alkanes to carbon dioxide is an extremely __________ reaction. Choices: - hydrolic - geothermal - reactive - exothermic A:
exothermic

Q: A, t, g, and c pairs are associated with what substance that is important in genetics? Choices: - plasma - bacteria - blood - dna A:
dna

Q: Q: What do you call a substance that cannot be broken down to other substances by chemical reactions.? Choices: - a participate - a molecule - a compound - an element A:
A: an element

Question: Q: What is the term for water that falls from clouds? Choices: - lightning - atmosphere - wind - precipitation A:
Answer: precipitation

*Question*
Q: What does pushing an object over the surface of a ramp cause? Choices: - Acceleration - vibration - tension - friction A:
**Answer**
friction

Q: What is the term for something left behind by once-living organisms? Choices: - decay - waste matter - deposits - fossils A:
fossils