815492
Questão 1
Questão
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
Questão 2
Questão
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
Questão 3
Questão
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
Questão 4
Questão
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
Questão 5
Questão
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
Questão 6
Questão
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
Questão 7
Questão
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
Questão 8
Questão
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
Questão 9
Questão
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
Questão 10
Questão
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
Questão 11
Questão
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
Questão 12
Questão
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
Questão 13
Questão
The density of table sugar is 1.59 g/mL. What is the mass if you have 3.14 mL?
Responda
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0.501 g
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1.98 g
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4.99 g
Questão 14
Questão
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
Questão 15
Questão
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
Questão 16
Questão
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
Questão 17
Questão
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
Questão 18
Questão
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
Questão 19
Questão
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
Questão 20
Questão
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
Questão 21
Questão
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
Questão 22
Questão
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
Questão 23
Questão
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
Questão 24
Questão
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
Questão 25
Questão
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
Questão 26
Questão
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
Questão 27
Questão
Group 11A is the
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alkaline earth metals
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Halogens
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Noble Gases
Questão 28
Questão
Which of the following elements is a metalloid?
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Si
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Pb
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Al
Questão 29
Questão
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
Questão 30
Questão
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
Questão 31
Questão
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
Questão 32
Questão
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
Questão 33
Questão
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
Questão 34
Questão
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
Questão 35
Questão
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
Questão 36
Questão
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
Questão 37
Questão
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
Questão 38
Questão
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
Questão 39
Questão
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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