_____ 1. An element has how many classes of properties to describe it? a. 1 b. 2
ID: 1005479 • Letter: #
Question
_____ 1. An element has how many classes of properties to describe it?
a. 1 b. 2 c. 3 d. 4
______2. When copper turns green, it is an example of its
a. chemical property c. value
b. physical property d. thickness
_____3. A chemical experiment is
a. never done in the laboratory
b. a carefully controlled and measured testing of a sample’s properties
c. something to try once and then move on to other things
d. always performed at room temperature
_____4. Which of the following is not a property of gold?
a. it is highly reactive c. it is naturally found as a solid
b. it melts at 300C d. it has luster
_____5. The chemical shorthand name for molybdenum is
a. Mo b. Mb c. Md d. Mn
_____6. Milli is the prefix used to show
a. 106 b. 107 c. 10-3 d. 10-1
_____7. Protons share the dense nucleus with
a. nuetrons b. molecules c. electrons d. atoms
______8. Electrons are
a. sub-atomic particles with a +1 charge
b. equal to the number of protons in a nucleus
c. said to be charmed
d. sub-atomic particles with a +2 charge
_____9. The force that binds 2 or more atoms together is known as
a. a chemical bond b. valence c. joules d. electromagnetsm
______10. A molecular formula
a. gives the total number of moles in a compound
b. is used only in derived chemical formulas
c. gives the number of each elemental atom in a molecule
d. is handy to have, but doesn’t include all the elements
_____11. The neutron is a subatomic
a. with no electric charge
b. with a -1 electric charge
d. with no counterpart within the atom.
_____12. The Aufbau principle
a. defines the undefined particles of the nucleus
b. is a method used to describe an atom’s ground state
c. provides radioactive levels of elements
d. lists the negative and positive spin of atoms
_____13. Ionization energy of an element
a. is the amount thrust needed to fly at mach speed
b. is the energy a neutron generates
c. cannot be calculated or observed
d. is the energy needed to remove an electron from an atom
_____14. Noble gases
a. are highly reactive with helium
b. are highly reactive with strontium
c. are unreactive under normal condition
d. are related to nobility
____15. A bond between atoms in a molecule is
a. made up of a shared electron pair
b. stronger than static electricity
c. always located in the 3s orbital
d. only a double bond
____16. Elements in 1V of the periodic table have
a. 3 valence electrons c. 5 valence electrons
b. 4 valence electrons d. 6 valence electrons
_____17. The electron configuration of an atom
a. is determined by the amount of kinetic energy present
b. is found by calculating atomic mass
c. is written as s,p,d,f subshells
d. describes the specific distribution of electrons in a subshell
____18. The Pauli exclusion principle states that
a. any atom with a free s orbital can form bonds
b. no two atoms can occupy the same orbital unless their spins are different
c. 2 atoms sharing an orbital are matched exactly
d. atoms of the same configuration do not change
_____19. In water molecules, how many oxygen atom(s) combine with hydrogen atoms?
a. 1 b. 2 c. 3 d. 4
______20. Reduction is the process
a. calculating the oxidation number of oxygen
b. increasing the oxidation number ok oxygen
c. losing hydrogen or electrons in a reaction
d. gaining hydrogen or electrons in a reaction
_____21. Gold with 79 protons has an atomic number of
a. 52 b. 57 c. 67 d. 79
_____22. If the temperature of a sample is 140C, what is the temperature in Kelvin?
a. 224 b. 259 c. 287 d. 295
____23. In chemistry, water is
a. always a bad choice for washing hands
b. commonly called the universal solvent
c. written as HO
d. written as OH
_____24. Hydrogen combines with carbon and forms all but one of the following?
a. hydrocarbons b. proteins c. starches d. table salt
_____25. The prefix bi means
a. 2 atoms c.containing hydrogen
b. 3 atoms d. containing oxygen
_____26. When naming compounds
a. metals come after metals
b. 2 nonmetals are named alphabetically
c. metals come before hydrogen
d. metals come before non-metals
_____27. Atomic number provides
a. the number of protons in the nucleus of an atom
b. the weight of an element
c. a shortcut to make the study of chemistry
d. the total number of protons and neutrons in the nucleus of an atom
_____28. Sulfur hexafluoride is written as
a. SF3 b. SF4 c. SF5 d. SF6
____29. A compound is binary covalent compound when
a. only 2 elements are present c. 60 carbons are bonded together
b. more than 3 elements are present d. a dozen elements are onded together
____30. Dinitrogen trioxide is written as
a. NO b. N2O3 c. N2O5 d. N2O4
_____31. Generally, ionic bonds form between
a. 2 metals c. a metal and a halogen
b. a metal and oxygen d. 2 nonmetals and 2 carbons
____32. Ionic bonding occurs
a. with only one type of anion
b. in the presence of high temperature
c. when electrons are transferred from one atom to another
d. when electrons are shared by 2 combining atoms
_____33. Electronegativity describes the
a. bad attitude of chemists when experiments don’t work
b. inability to maintain a charge
c. electron loss in a covalent compound
d. ability of an atom to attract electron(s) to itself
_____34. What is the most electronegative element?
a. carbon b. oxygen c. fluorine d. iodine
_____35. Which of the following is a polar covalent compound?
a. sugar b. salt c. water d.milk
____36. The Ph scale measures
a. the weight of a liquid c. the temperature of a liquid
b. the acidity of a liquid d. the density of a liquid
_____37. A Bronsted- Lowry acid
a. changes litmus paper from red to blue
b. donates a proton in a reaction
c. is a classification of a strong acid
d. ionizes almost completely in water
_____38. Which of the following is not a true statement about gases?
a. they are the least compacted form of matter
b. they are more active than liquid
c. they prefer to be as far as possible from each other
d. they have definite shapes
_____39.Boyle’s law describes
a. the ideal gas law
b. the relationship between pressure and temperature
c. the relationship between pressure and volume if temperature is constant
d. an idea that does not apply to ideal gas
_____40.The pressure of a gas is directly proportional to the Kelvin temperature in
a. Boyle’s law b. Gay-Lussac’s law c. Boyd’s law d. Charle’s law
TEST 11. Answer the following questions briefly but completely:
1.What determines the atoms identity? Why?
2. Is it possible for a covalent compound to be both polar and non polar at the same time?
Explain by giving an example.
Explanation / Answer
Solution:- (1) All properties of an element are categories as either physical or chemical. So, the answer to the question is (b) 2.
(2) Color of copper is redish brown but when it's oxidation takes place then it turns green as it forms its oxide, CuO.
2Cu + O2 ------> CuO (green color)
So, the correct answer is (a) chemical property.
(3) A chemical experiment is they way to test the chemical composition or the reactivity of the sample and it is done in a laborator. Reactions could either be exothermic or endothermic and so the temperature requirements are different so room temperature is always not good.
So, the correct choice is (b) a carefully controlled and measured testing of a sample's properties.
(4) Gold is a transition metal and we know that metals has luster. In nature it is found as a solid(found in its ores). It is a very less reactive metal. It is a soft metal and so its melting point is not that too much high. So, the answer to this question is, (a) It is highly reactive.
(5) From periodic table the elemental symbol for Molybdenum is Mo. So, the correct choice is (a). Mo.
(6) Milli is like the 1000th part means 1/1000 of something and 1/1000 could also be written as 10-3. So, the correct answer is (c). 10-3.
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