815492
Pregunta 1
Pregunta
Tin is atomic number 50. The means that all tin atoms have?
Respuesta
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50 protons in the nucleus
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50 neutrons in nucleus
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50 electrons
Pregunta 2
Pregunta
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
Pregunta 3
Pregunta
In which of the following pairs of elements are both members of the pair metals?
Respuesta
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P and O
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Nb and Ar
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Ag and Bi
Pregunta 4
Pregunta
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
Pregunta 5
Pregunta
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
Pregunta 6
Pregunta
In which of the following measure numbers are all of the zeros significant
Respuesta
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0.0705
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0.000440
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3.945900
Pregunta 7
Pregunta
What is the mass, in grams, of 30.7 mL of a liquid if its density is 0.81 g/mL?
Respuesta
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25 g
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3.8 g
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38 g
Pregunta 8
Pregunta
If the temperature of an object is 435 degrees C what is the temp on a Kelvin scale?
Respuesta
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162 K
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708 K
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608 K
Pregunta 9
Pregunta
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?
Respuesta
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1.796 g/mL
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26.83 g/mL
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19.3 g/mL
Pregunta 10
Pregunta
Express 4.5 x 10^4 liters in milliliters
Respuesta
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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
Pregunta 11
Pregunta
Glass has a density of 2.05 g/mL. What is the volume of 46.3 grams of glass?
Respuesta
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94.9 mL
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0.0443 mL
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22.6 mL
Pregunta 12
Pregunta
Glass has a density of 2.05 g/mL. What is the volume of 46.3 grams of glass?
Respuesta
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94.9 mL
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0.0443 mL
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22.6 mL
Pregunta 13
Pregunta
The density of table sugar is 1.59 g/mL. What is the mass if you have 3.14 mL?
Respuesta
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0.501 g
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1.98 g
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4.99 g
Pregunta 14
Pregunta
In which of the following pairs of properties are both properties chemical properties?
Respuesta
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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
Pregunta 15
Pregunta
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
Pregunta 16
Pregunta
The measurement 8310.90 expressed in scientific notation becomes
Respuesta
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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
Pregunta 17
Pregunta
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
Pregunta 18
Pregunta
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
Pregunta 19
Pregunta
In which of the following sequences of elements do all members of the sequence have chemical symbols starting with the same letter?
Respuesta
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sulfur, silicon, sodium
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gold, silver, aluminum
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potassium, phosphorus, lead
Pregunta 20
Pregunta
Which of the following changes is a chemical change?
Respuesta
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melting of ice
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pulverizing of hard sugar cubes
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rusting of iron
Pregunta 21
Pregunta
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
Pregunta 22
Pregunta
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
Pregunta 23
Pregunta
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
Pregunta 24
Pregunta
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
Pregunta 25
Pregunta
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
Pregunta 26
Pregunta
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
Pregunta 27
Pregunta
Group 11A is the
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alkaline earth metals
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Halogens
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Noble Gases
Pregunta 28
Pregunta
Which of the following elements is a metalloid?
Respuesta
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Si
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Pb
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Al
Pregunta 29
Pregunta
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
Pregunta 30
Pregunta
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
Pregunta 31
Pregunta
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
Pregunta 32
Pregunta
Elements in groups 1A and 11A are referred to as the?
Respuesta
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p-block elements
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d-block elements
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s-block elements
Pregunta 33
Pregunta
What subatomic particles are found in the nucleus?
Respuesta
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proton and electrons
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protons
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neutrons and protons
Pregunta 34
Pregunta
Express the length 3.22 mm in centimeters.
Respuesta
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3.22 cm
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322 cm
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0.322 cm
Pregunta 35
Pregunta
What are the horizontal rows of the periodic table called?
Respuesta
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Group
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Periods
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Families
Pregunta 36
Pregunta
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
Pregunta 37
Pregunta
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
Pregunta 38
Pregunta
An atom contains 33 protons, 35 neutrons and 33 electrons. The atomic number and mass number for the atoms are, respectively.
Respuesta
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35 and 33
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33 and 35
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33 and 68
Pregunta 39
Pregunta
In which of the following sequences of elements does each of the elements have a two-letter chemical symbol.
Respuesta
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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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