815492
Frage 1
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Tin is atomic number 50. The means that all tin atoms have?
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50 protons in the nucleus
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50 neutrons in nucleus
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50 electrons
Frage 2
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After the 4s subshell of an atom is filled with electrons, the next electron added will enter the
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3d subshell
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4d subshell
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4p subshell
Frage 3
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In which of the following pairs of elements are both members of the pair metals?
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P and O
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Nb and Ar
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Ag and Bi
Frage 4
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The modern periodic table arranges the elements in order of
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year of discovery
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reactivity with oxygen
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increasing number of protons
Frage 5
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Isotopes of a given element ________
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have the same mass number but different numbers of protons
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have different mass numbers but identical numbers of protons
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have the same mass number but different chemical properties
Frage 6
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In which of the following measure numbers are all of the zeros significant
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0.0705
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0.000440
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3.945900
Frage 7
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What is the mass, in grams, of 30.7 mL of a liquid if its density is 0.81 g/mL?
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25 g
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3.8 g
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38 g
Frage 8
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If the temperature of an object is 435 degrees C what is the temp on a Kelvin scale?
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162 K
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708 K
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608 K
Frage 9
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A sample of the element calcium weighing 42.923 grams was dropped in a graduated cylinder containing 22.30 mL of water. The volume of the water plus the sample was 23.90 mL. What is the density of calcium?
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1.796 g/mL
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26.83 g/mL
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19.3 g/mL
Frage 10
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Express 4.5 x 10^4 liters in milliliters
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4.5 x 10^3
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4.5 x 10^7
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4.5 x 10^6
Frage 11
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Glass has a density of 2.05 g/mL. What is the volume of 46.3 grams of glass?
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94.9 mL
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0.0443 mL
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22.6 mL
Frage 12
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Glass has a density of 2.05 g/mL. What is the volume of 46.3 grams of glass?
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94.9 mL
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0.0443 mL
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22.6 mL
Frage 13
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The density of table sugar is 1.59 g/mL. What is the mass if you have 3.14 mL?
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0.501 g
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1.98 g
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4.99 g
Frage 14
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In which of the following pairs of properties are both properties chemical properties?
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freezes at 10 degrees C and nonflammable
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decomposes at 500 degrees C and reacts with bromine
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poor conductor of heat and is reddish brown in color
Frage 15
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In which of the following pairs of measured numbers does each member of the pair contain the same number of sig figs?
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10.3 and 10.30
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800.0 and 80
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0.000096 and 960.000
Frage 16
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The measurement 8310.90 expressed in scientific notation becomes
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8.3109 x 10^4
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8.3109 x 10^2
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8.3109 x 10^3
Frage 17
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The density of an object is the ratio of its
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length to volume
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mass to volume
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mass to height
Frage 18
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The density of an object is the ratio of its
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length to volume
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mass to volume
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mass to height
Frage 19
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In which of the following sequences of elements do all members of the sequence have chemical symbols starting with the same letter?
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sulfur, silicon, sodium
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gold, silver, aluminum
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potassium, phosphorus, lead
Frage 20
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Which of the following changes is a chemical change?
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melting of ice
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pulverizing of hard sugar cubes
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rusting of iron
Frage 21
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Which of the following changes is a chemical change?
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melting of ice
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pulverizing of hard sugar cubes
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rusting of iron
Frage 22
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Your sweetheart gives you 1.25 lb. of Seattle's Chocolates for Valentine's Day. How much is this in grams?
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908 g
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568 g
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363 g
Frage 23
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This states that any compound is always made up of elements in the same proportion by mass.
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Dalton's Atomic Theory
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Octet Rule
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Law of Definite Composition
Frage 24
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An element is a substance that
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can be broken down into simpler substances by physical means
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cannot be broken down by chemical or physical means
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can be broken down by chemical means
Frage 25
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The description "two substances present, two phases present" is correct for
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heterogeneous mixtures
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homegeneous mixtures
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elements
Frage 26
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Electrons in an orbital always-
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spin in the same direction
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are neutral
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spin in opposite direction
Frage 27
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Group 11A is the
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alkaline earth metals
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Halogens
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Noble Gases
Frage 28
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Which of the following elements is a metalloid?
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Si
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Pb
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Al
Frage 29
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A substance has a freezing point of -20 degrees C. This is an example of a:
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Physical property
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chemical property
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physical change
Frage 30
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What is true about metal elements to nonmetal elements?
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more nonmentals than metals
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more metals than nonmetals
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there are no nonmetals
Frage 31
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Matter is neither created nor destryoed:
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Octet Rule
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Dalton's Atomic Theory
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Law of Conservation of Matter
Frage 32
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Elements in groups 1A and 11A are referred to as the?
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p-block elements
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d-block elements
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s-block elements
Frage 33
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What subatomic particles are found in the nucleus?
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proton and electrons
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protons
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neutrons and protons
Frage 34
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Express the length 3.22 mm in centimeters.
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3.22 cm
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322 cm
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0.322 cm
Frage 35
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What are the horizontal rows of the periodic table called?
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Group
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Periods
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Families
Frage 36
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The properties of ductility, malleability, ability to conduct heat and electron characteristics of what type of materials ?
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All Elements
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Metallic Elements
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Metalloids Elements
Frage 37
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Nonmetallic elements This term used to describe how consistently several measurements of some quantity give the same result is?
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Exactness
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Accuracy
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Precision
Frage 38
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An atom contains 33 protons, 35 neutrons and 33 electrons. The atomic number and mass number for the atoms are, respectively.
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35 and 33
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33 and 35
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33 and 68
Frage 39
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In which of the following sequences of elements does each of the elements have a two-letter chemical symbol.
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Barium, iron, nitrogen
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Silicon, zinc, hydrogen
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Selenium, nickel strontium
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