Basic Chemistry Science Test

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1. Pure substances that can't be broken down chemically into simpler kinds of matter
atoms
elements
molecules
compounds
2. Anything that takes up space and has mass
mass
matter
atomic mass
3. reactions that absorb free engery
exergonic reactants
endergonic reactants
activational energy
4. simplest particle of an element that retains all properties of that element
atoms
elements
molecules
compounds
5. central core of an atom contains protons and neutrons
core
nucleus
6. speeds in which electrons move around the nucleus
free energy
energy levels
activational energy
7. a pure substance that's made of atoms
atoms
elements
molecules
compounds
8. combining in a way that causes atoms to become stable
chemical bond
chemical reaction
ionic bonding
hydroxide bonding
9. when 2 atoms share 1 or more pairs of electrons
chemical bond
chemical reaction
covalent bond
ionic bonding
10. simplest part of a substance htat retains all of the properties of the substance; exist in a free state
atoms
elements
molecules
compounds
11. when a postive and negative charge are attracted to eachother
chemical bond
chemical reaction
covalent bond
ionic bonding
12. ability to do work
energy
stamina
free energy
energy levels
13. energy in a system that is available to do work
energy
stamina
free energy
energy levels
14. reduces that amount of energy needed to start a reaction
enzymes
catalyst
capillery
15. reactions that release free energy
exergonic reactants
endergonic reactants
activational energy
16. important catlysts in living things
enzymes
catalyst
capillery
17. when electrons go back and forth between atoms
redox reaction
oxidation reaction
reduction reaction
18. a reactant loses 1 more electrons and becomes positive in charge
redox reaction
oxidation reaction
reduction reaction
19. chemical substances that neutralize small amounts of an acid or base added to a solution; causes there not to be big swings in pH
enzymes
catalyst
capillery
buffers
20. compares hydronium to hydroxide
acid
base
nuetral
pH scale
21. a reactant gains 1 or more electrons
redox reaction
oxidation reaction
reduction reaction
22. when there is more hydroxide than hyronium
base
neutral
acid
23. OH+
hydroxide
hydronium
acide
base
24. when there is more hydronium than hydroxide
base
neutral
acid
25. H2O+
hydroxide
hydronium
acid
base
26. solvent + solute
solution
solute
solvent
27. part of the solution that does the dissolving
solution
solute
solvent
28. part of the solution that gets dissolved
solution
solute
solvent
29. the breaking apart of a molecule into two ions
dissociation
solute
solvent
solution
30. a solution in which water is hte solvent
dissociation
aqueous
solvent
solution
31. the amount of solute dissolved in a fixed amount of the solution
concentration
saturate
dissociation
32. no more solte can dissolve
concentration
saturate
dissociation

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