Lab: Motion — Cumulative exam Answers
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The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?
A
They are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties.B
They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.C
They are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties.D
They are in the same group because they have similar atomic masses, but they are in different periods because they have very different atomic numbers.22
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Which is a property of every homogeneous mixture?
A
Each part of the mixture has the same appearance.B
The mixture is made up of a solid dissolved in a liquid.C
The characteristics of the mixture change within a single sample.D
The components of the mixture change within a single sample.23
These models show the electron structures of two different nonmetal elements.
A
Element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table.B
Element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table.C
Element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons.D
Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.24
Which ranks these materials by the attraction between their atoms from the weakest to the strongest?
A
oxygen gas, liquid water, liquid honey, solid iron oreB
liquid water, liquid honey, oxygen gas, solid iron oreC
solid iron ore, liquid honey, liquid water, oxygen gasD
oxygen gas, liquid honey, liquid water, solid iron ore25
What best describes the states of nonmetals when they are at room temperature?
A
Most nonmetals are gaseous, but some are liquid or solid.B
All nonmetals are gaseous unless they bond with a metal.C
Most nonmetals are solids, but some are gaseous or liquid.D
All nonmetals are solid unless they bond with a metal.Did you find these answers helpful?
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