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Unit 2 Chemistry Test

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Aspartame is an artificial sweetener; its formula is C13H16N2O5. Which element in the formula has the largest number of atoms?
a.
 carbon
c.
 nitrogen
b.
 hydrogen
d.
 oxygen
 

 2. 
Dot diagrams are used to represent ____.
a.
 protons
c.
 atomic mass
b.
 valence electrons
d.
 the structure of the nucleus
 

 3. 
Each substance written to the right of the arrow in a chemical equation is a ____.
a.
 reactant
c.
 precipitate
b.
 product
d.
 catalyst
 

 4. 
Which of these statements about matter is NOT true?
a.
 During chemical changes, matter is destroyed.
b.
 Matter has mass and takes up space.
c.
 Matter can be divided into pure substances and mixtures.
d.
 Matter is made up of atoms.
 

 5. 
Which of the following elements will likely form a negative ion in its ionic compounds?
a.
 Li, lithium
c.
 Mg, magnesium
b.
 Al, aluminum
d.
 Cl, chlorine
 

 6. 
All of the following are a state of matter EXCEPT ____.
a.
 solid
c.
 liquid
b.
 gas
d.
 density
 

 7. 
In general, nonmetals are ____.
a.
 good conductors of electricity
c.
 good conductors of heat
b.
 malleable and ductile
d.
 gases at room temperature
 

 8. 
Which chemical equation is balanced?
a.
 Na + O2 ® Na2O
c.
 2Na + 2O2 ® 2Na2O
b.
 2Na2 + O2 ® 2Na2O
d.
 2Li + O2 ® 2Li2O
 

 9. 
Which of the following is an example of a chemical change?
a.
 bending a pop can
c.
 melting wax
b.
 evaporation of milk
d.
 burning paper
 

 10. 
Which of the following compound is not likely to have ionic bonds?
a.
 LiF
c.
 CH4
b.
 NaCl
d.
 MgF2
 

 11. 
The maximum number of electrons in the second energy level of an atom is ____.
a.
 two
c.
 eight
b.
 four
d.
 ten
 

 12. 
Most of the mass of an atom is found in its ____.
a.
 nucleus
c.
 atomic number
b.
 electron cloud
d.
 mass number
 

 13. 
In an atom, electrons ____.
a.
 are located in the nucleus
c.
 travel outside the nucleus
b.
 are paired with neutrons
d.
 are always in the same place in an atom
 

 14. 
Water (H2O) and hydrogen peroxide (H2O2) have different properties because ____.
a.
 they are made from different elements
b.
 one contains a greater percentage of oxygen than the other
c.
 one is a compound and one is a mixture
d.
 only water follows the law of definite proportions
 

 15. 
The three sub-particles that make up an atom are ____.
a.
 electrons, protons, and nuclei
c.
 protons, neutrons, and nuclei
b.
 elements, protons, and electrons
d.
 protons, neutrons, and electrons
 

 16. 
Sulfur, element 16, forms a negative ion. How many dots would you have to show in the electron dot diagram for the sulfur ion?
a.
 two
c.
 eight
b.
 six
d.
 sixteen
 

 17. 
The millions of compounds that exist are made from approximately ____ elements.
a.
 50
c.
 118
b.
 75
d.
 150
 

 18. 
How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2?
a.
 one
c.
 three
b.
 two
d.
 four
 

 19. 
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a.
 There is no relationship.
b.
 The mass of products is sometimes greater.
c.
 The mass of reactants is greater.
d.
 The masses are always equal.
 

 20. 
Viscosity is a measure of a fluid's ____.
a.
 resistance to flow
c.
 average kinetic energy
b.
 adhesive forces
d.
 buoyancy
 

 21. 
What is the group number for the Noble Gases that have a stable number of electrons in their outer energy level?
a.
 8A
c.
 2A
b.
 7A
d.
 1A
 

 22. 
Which of the following notations represents a molecule?
a.
 NaCl
c.
 H2O
b.
 He
d.
 Li
 

 23. 
All ____ except mercury are solids at room temperature.
a.
 metalloids
c.
 metals
b.
 nonmetals
d.
 mixtures
 

 24. 
Which of the following is an example of a physical change?
a.
 evaporation in a swamp cooler
c.
 digestion of a hamburger
b.
 electricity produced by a dry cell
d.
 rusting of a car body
 

 25. 
Some elements are unlikely to lose or gain electrons, but share electrons to form covalent bonds. Which of the following elements is most likely to form covalent bonds?
a.
 Calcium
c.
 Neon
b.
 Lithium
d.
 Carbon
 

 26. 
In carbon dioxide, each oxygen atom shares four electrons with the carbon atom. What is this type of bond called?
a.
 triple covalent
c.
 polar covalent
b.
 double covalent
d.
 ionic
 

 27. 
When the following chemical reaction is balanced, what number is placed before NH3?
N2 + 3H2 ® NH3
a.
 1
c.
 3
b.
 2
d.
 6
 

 28. 
Which of the following changes is chemical rather than physical?
a.
 Water is boiled.
c.
 Glass is shattered.
b.
 Aluminum foil is crumpled.
d.
 Wood is burned.
 

 29. 
How many dots are shown in the electron dot diagram for calcium, element number 20?
a.
 one
c.
 eight
b.
 two
d.
 twenty
 

 30. 
A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is ____.
a.
 26
c.
 52
b.
 30
d.
 56
 

 31. 
In general, which family of elements are the best cleaning agents and disenfectants?
a.
 Alkali Metal Family
c.
 Alkaline Earth Metal Family
b.
 Boron Family
d.
 Halogen Family
 

 32. 

mc032-1.jpgIn Science class Joey was bored with the current lab that everyone was working on and against his better judgment, he decided to conduct his own experiment.   He started mixing acetic acid "vinegar" (CH3OOH) and sodium bicarbonate "Baking Soda" (NaHCO3), which is a white powder that looks a lot like flour.  Little did Joey know that this was an acid base reaction that would result in a foaming and bubbling mess.  Before he realized what he had done, it was too late and the lab table, books, and papers were totally soaked in a watery and foamy mess. One of the products produced in this chemical reaction is carbonic acid which quickly decomposes into carbon dioxide and water.
The baking soda Joey mixed is in what state of matter
a.
 liquid
c.
 gas
b.
 solid
d.
 plasma
 

 33. 
Referring to the passage in question 32, what would be the correct balanced equation of the decomposition of carbonic acid?
a.
 H2CO3 ---> 2H2O + CO2
c.
 H2CO3 ---> H2O + CO2
b.
 2H2CO3 ---> 2H2O + CO2
d.
 H2CO3 ---> H2O + 2CO2
 

 34. 
Referring to the passage in quesiton 32, when Joey combined the vinegar and baking soda what type of change occured?
a.
 physical change
c.
 super-saturated change
b.
 chemical change
d.
 No change took place
 

 35. 
Referring to the passage in quesiton 32, How many atoms of Oxygen are found in venegar (CH3OOH)
a.
 2
c.
 1
b.
 3
d.
 0
 

 36. 
Referring to the passage in quesiton 32, when Joey’s notebook and papers became wet, what type of change was this considered?
a.
 chemical
c.
 geological
b.
 physical
d.
 none of the above
 

 37. 
Referring to the equation in question 33, which would be considered the reactant
a.
 H2CO3
c.
 CO2
b.
 H2O
d.
 NaHCO3
 

Matching
 
 
Match the term with the event or the definition.
a.
 physical property
c.
 chemical property
b.
 physical change
d.
 chemical change
 

 38. 

 wind and water erosion
 

 39. 

 the wall was blue
 

 40. 

 plant making food out of water and carbon dioxide
 

 41. 

 leaves changing colors in the fall
 

 42. 

 orange juice being made from fresh oranges
 
 
Match the substance with the state of matter.
a.
 gas
b.
 liquid
c.
 solid
d.
 plasma
 

 43. 

 fire
 

 44. 

 air
 

 45. 

 hydrogen
 

 46. 

 ice cubes
 

 47. 

 sand
 

 48. 

 coke
 
 
Match the correct bohr model with the questions below:
a.
 grp003-1.jpg
c.
 grp003-3.jpg
b.
 grp003-2.jpg
d.
 grp003-4.jpg
 

 49. 

 Which bohr model represents Hydrogen?
 

 50. 

 What bohr model has 6 valence electrons?
 

 51. 

 Which bohr model represents Neon?
 

 52. 

 Which bohr model represents Oxygen?
 

 53. 

 Which bohr model has a mass number of 7?
 

 54. 

 Which bohr model represents Lithium?
 

 55. 

 Which bohr model represents an element that is most likely a negative ion?
 

 56. 

 Which bohr model represents an element that is an Alkali Metal?
 



 
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