Physical Science Question Preview (ID: 46583)
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Why are certain elements placed into the same column on the periodic table?
a) They have the same number of protons in their nuclei.
b) They have the same number of electrons in their nuclei.
c) They have the same number of electrons in their outer energy level.
d)
Which of these is one similarity of the elements in the first group of the periodic table?
a) The elements in the group have similar atomic masses
b) The elements in the group have the same number of electrons.
c) The elements in the group are very unreactive metals.
d) The elements in the group react with oxygen in similar ways.
Which best describes how the current periodic table is arranged?
a) by atomic mass
b) by atomic number
c) in alphabetical order by element symbol
d) in numerical order by number of neutrons in the nucleus
Which element is the least reactive?
a) Carbon
b) Helium
c) Hydrogen
d) Iodine
Iron filings are thrown into a pile of sand. What is the best way to separate this mixture?
a) Use a magnet to pick up the sand.
b) Sift through the sand for all of the iron.
c) Use a magnet to pick up the iron filings.
d) Evaporate the sand
Which best represents a heterogeneous mixture?
a) A vegetable oil
b) B sand at the beach
c) C a solution of sugar and water
d) D human blood
Which substance is a compound?
a) A orange juice
b) B salt water
c) C hydrogen
d) D water
When table salt (NaCl) is produced, which of the following BEST describes the actions of the sodium (Na) and chlorine (Cl) atoms?
a) A Sodium atoms replace chlorine atoms.
b) B Sodium and chlorine atoms mix together.
c) C Sodium atoms dissolve in chlorine atoms.
d) D Sodium and chlorine atoms bond chemically.
How are the properties of elements related to the properties of the compounds they make?
a) The properties of the compound are always the same as the properties of the elements.
b) The properties of the compound are completely different than the properties of the elements.
c) The element in the compound with the largest number of atoms gives the compound its properties.
d) The element in the compound with the smallest number of atoms gives the compound its properties.
A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred?
a) 45 grams
b) 150 grams
c) 605 grams
d)
The following chemical reaction occurs. 2H2O2 → 2H2O + O2 How many atoms of hydrogen are involved in the reaction?
a) 1
b) 2
c) 4
d) 8
In a chemical reaction, what is the best description of a molecule’s movement when the temperature decreases?
a) A movement decreases
b) B movement increases
c) C movement stays the same
d)
Which best describes elements found in a column of the periodic table?
a) The elements have the same-size atoms.
b) The elements have the same atomic number.
c) The elements have similar chemical properties.
d) The elements are all found naturally in the same physical state.
Which best represents a physical property of a substance?
a) phase change
b) gas formation
c) change in mass
d) change in shape
Which would provide the best evidence that a chemical reaction had occurred?
a) Acids act as a corrosive to metal.
b) Gold has a density of 19.3 g/cm3.
c) Sodium combines with chlorine to create sodium chloride.
d) Hydrochloric acid reacts with zinc metal, creating hydrogen gas.
Which changes when gases condense to form liquids?
a) physical mass
b) physical state
c) chemical reactivity
d) chemical composition
Which best represents a balanced equation?
a) Mg(s) + 2O2(g) - 2MgO(s)
b) Mg(s) + O2(g) -2MgO(s)
c) 2Mg(s) + O2(g) - 2MgO(s)
d)
Which statement BEST explains why coal is used to generate electricity despite the amount of pollution produced by burning coal?
a) Compared to other fuels, coal produces more energy per kilogram.
b) Compared to other fuels, coal is relatively cheap and plentiful.
c) Coal burns without producing greenhouse gases.
d) Coal is a renewable source of energy.
The construction of Hoover Dam on the Colorado River resulted in abundant fresh water and electrical power for the region. Which of these is a disadvantage of the construction of Hoover Dam?
a) an increase in flooding downstream
b) an increase in regional humidity
c) a decrease in the amount of river ecosystems
d) a decrease in the amount of water for irrigation
Wind farms use turbines to generate electricity without using fossil fuels. What is one negative consequence of using wind turbines to generate electricity?
a) Wind turbines change global weather patterns
b) Wind turbines produce excess carbon dioxide.
c) Power is produced by wind farms using a nonrenewable resource.
d) Developing and maintaining wind farms damages ecosystems.
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