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Science Exam
Chemical Compounds/Electromagnetic stuff
19
Science
8th Grade
05/26/2009

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Term



Compounds are composed of elements whose atoms share electrons

Definition
Covalent
Term
A solution that has a pH of ???? is neutral.
Definition
7
Term
Human blood has a pH of between 7.38  and 7.42. this means that the blood is........
Definition
slightly basic
Term
some plants, such as pine trees, prefer soil with a pH between 4 and 6. these plants prefer.....
Definition
acidic soil
Term
plants, such as lettuce, grow best in soil with a pH between 8 and 9. these plants prefer...
Definition
basic soil
Term
freshwater fish need water near pH 7. these fish prefer......
Definition
nuetral water
Term
rainwater can have a pH as low as 3, meaning that it is very....
Definition
acidic
Term
a single bond consists of one pair of shared.....
Definition

electrons

 

Term
the starting materials in a chemical reaction are...
Definition
reactants
Term
the substances formed from a chemical reaction  are....
Definition
products
Term
a chemical reaction in which energy is released or removed is...
Definition
exothermic
Term
a chemical reaction in which energy is absorbed is...
Definition
endothermic
Term
what increases the solubility of a gas in a liquid?
Definition
decreasing the tempature
Term
what best describes chicken noodle soup?
Definition
mixture
Term
how is a mixture diffrebt from a compound?
Definition
each substance in a mixture keeps most of its characteristic properties
Term
the three major categories of elements are...
Definition
metals, nonmetals, and metalloids
Term
medicines that instruct you to shake the bottle well before use are most likely ...
Definition
suspensions
Term
you add sugar to 50mL of hot tea and to 50 mL of iced tea until each is saturated. which cup would have a higher concentration?
Definition
the iced tea
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