Diamond and graphite are
a. similar in physical properties.
b. composed of the same element.
c. of the same crystalline structure.
d. bonded in the same manner.
[Ques. 2] A common fuel impurity in fossil fuels is ______________.
Fill in the blank(s) with correct word
[Ques. 3] Only two elements, mercury and ______________, are liquid at room temperature and atmospheric pressure.
a. sodium
b. bromine
c. phosphorus
d. iodine
[Ques. 4] A class of pollutants formed at high temperatures (nearly complete combustion) in the presence of air is ______________.
Fill in the blank(s) with correct word
[Ques. 5] About 75 of the mass of the visible universe is composed of which element?
a. Helium
b. Iron
c. Hydrogen
d. Silicon
[Ques. 6] Smog is a mixture of ______________ and ______________.
Fill in the blank(s) with correct word
[Ques. 7] Nearly 100 by mass of Earth's core is composed of the two elements
a. iron and nickel
b. aluminum and silicon
c. oxygen and aluminum
d. silicon and oxygen.
[Ques. 8] Air pollution results from ______________ combustion of ______________ fuels.
Fill in the blank(s) with correct word
[Ques. 9] About 15 by mass of Earth's core is composed of the element(s)
a. iron
b. nickel
c. oxygen.
d. silicon.
e. iron and nickel.
[Ques. 10] A natural agent of chemical weathering that is enhanced by CO2 pollution is ______________.
Fill in the blank(s) with correct word
Quick Reply
