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- Which of the following is a liquid at room temperature?
A. oxygen C. salt
B. copper D. mercury
- Which of the following compositions of matter is a pure substance?
A. water C. 2% milk
B. wet sand D. sweet tea
- Which of the following is a compound?
A. magnesium C. nickel(II) sulfide
B. oxygen D. helium
- Which of the following processes describes a physical change of matter?
A. the oxidation of methanol (CH 3 OH) to formaldehyde (CH 2 O) upon ingestion
B. the rusting of iron to form iron oxide
C. the distillation of ethanol (CH 3 CH 2 OH) from a mixture of ethanol and water
D. the combustion of gasoline producing water and carbon dioxide
- Thermal energy is
A. always conserved.
B. the energy associated with the temperature of an object.
C. the energy associated with the position of an object.
D. associated with the effect of gravity of an object.
- Which of the following prefix multipliers is the result of this calculation?
(1ร10โ^13 ) รท (1ร10โ^4 ) =
A. milli C. mega
B. micro D. nano
- In scientific notation, 677600 is expressed as
A. 10 6.776^ C. 6.77600 ร 10โ^5
B. 6.77600ร 10โ^3 D. 6.776 ร 10^5
- A copper cube has a mass of 62.7 g. What is the length of the edge of the cube? (density of copper = 8.96 g/cm^3 )
A. 1.91 cm C. 3.19 cm
B. 4.48 cm D. 7.89 cm
- What is the density of an object with a mass of 149.8 g and a volume of 12.1 mL?
A. 1.38 g/mL C. 12.4 g/mL
B. 8.08 g/mL D. 18.1 g/mL
- Which property of matter is the most useful for identifying an unknown substance?
A. mass C. density
B. volume D. weight
- Which answer should be reported, with the correct number of significant figures, for the following calculation? 433.621 โ 333.9 =?
A. 100 C. 99.
B. 99.721 D. 99.
- An automobile gasoline tank holds 21 kg of gasoline. When all of the gasoline is consumed, 86 kg of oxygen is consumed as well. If the only products of the reaction are carbon dioxide and water vapor, what is the mass of the products?
A. 107 kg C. 60 kg
B. 44 kg D. 18 kg
- In a neutral atom, the mass number equals
A. the sum of the number of electrons and neutrons.
B. twice the number of protons.
C. (^) the sum of the number of electrons and protons.
D. the sum of the number of protons, neutrons, and electrons.
- Which group identifies each particle with its charge?
A. proton +1, neutron โ 1, electron 0
B. proton +1, neutron 0, electron โ 1
C. proton โ 1, neutron 0, electron +
D. proton 0, neutron +1, electron โ 1
- Which element does X represent in the following symbol?
14 X
A. nickel C. sulfur
B. zinc D. silicon
- Complete the following table:
Atomic Number Charge Electrons Ion Symbol 8 2โ W = X = 55 Y = 54 Z =
A. W= 10, X = O2โ, Y = 1+, Z = Cs+
B. W = 8, X = O2โ, Y = 1โ, Z = Mn+
C. W = 8, X = O2+, Y = 1+, Z = Mn+
D. W = 6, X = O2+, Y = 1+, Z = Cs+
- Which of the following is a transition element?
A. K C. F
B. Sn D. Pd
- Chlorine has an average atomic mass of 35.45 amu and consists of two stable isotopes, (^35) Cl and 37 Cl. 35 Cl has a mass of 34.97 amu and 37 Cl has a mass of 36.97 amu. What is the natural abundance of 37 Cl?
A. 50% C. 33%
B. 24% D. 66%
- Naturally occurring gallium has two stable isotopes and an atomic mass of 69.723 amu. If 69 Ga (68.926 amu) is 60.11% of natural Ga, what is the mass of the other isotope?
A. 70.92 amu C. 70. 72 amu
B. 70.96 amu D. 70.99 amu
- Which of the following is an ionic compound?
A. LiCl C. PCl 3
B. NO 2 D. CF 4
- What is the chemical formula of sodium hypochlorite?
A. NaClO 2 C. Na 2 CrO 4
B. NaClO D. NaHCO 3
- What is the chemical name of CS 2?
A. carbon sulfide C. dicesium
B. carbon disulfide D. carbon(IV) sulfide
- Naturally occurring fluorine has only one stable isotope. Which statement is true for the most stable ion of fluorine?
A. The number of protons equals the number of electrons.
B. The number of protons is larger than the number of electrons.
C. The number of neutrons equals the number of electrons.
D. The sum of the number of protons, neutrons, and electrons equals 19.
Answer Key :
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