#1
What is the charge of a chloride ion?
-1
ExplanationChloride ions gain one electron, resulting in a charge of -1.
#2
Which of the following represents a molecular formula?
H2O
ExplanationH2O is a molecular formula representing water.
#3
How many atoms are there in one mole of a substance?
6.02 x 10^23
ExplanationOne mole of a substance contains Avogadro's number of atoms, approximately 6.02 x 10^23.
#4
Which of the following is a diatomic molecule?
O2
ExplanationO2 is a diatomic molecule consisting of two oxygen atoms.
#5
How many valence electrons does a chlorine atom have?
7
ExplanationChlorine has 7 valence electrons in its outermost shell.
#6
What is the molecular formula for methane?
CH4
ExplanationMethane's molecular formula is CH4.
#7
What is the charge on a sulfate ion (SO4^2-)?
-2
ExplanationSulfate ions carry a double negative charge (-2).
#8
How many oxygen atoms are there in one molecule of sulfuric acid (H2SO4)?
4
ExplanationSulfuric acid (H2SO4) contains 4 oxygen atoms.
#9
Which of the following ions has a noble gas electron configuration?
Mg2+
ExplanationMg2+ has a noble gas electron configuration by losing two electrons.
#10
What is the formula for the hydroxide ion?
OH-
ExplanationThe hydroxide ion is represented by the formula OH-.
#11
What is the chemical formula for the carbonate ion?
CO3^2-
ExplanationThe carbonate ion is represented by the formula CO3^2-.
#12
What is the molecular formula of hydrogen peroxide?
H2O2
ExplanationHydrogen peroxide's molecular formula is H2O2.
#13
What is the molecular formula of ammonia?
NH3
ExplanationAmmonia's molecular formula is NH3.
#14
In the compound C6H12O6, what type of formula is C6H12O6?
Molecular formula
ExplanationC6H12O6 is a molecular formula representing glucose.
#15
What is the charge of a nitrate ion (NO3-)?
-1
ExplanationNitrate ions carry a single negative charge (-1).
#16
What is the formula for nitrous acid?
HNO2
ExplanationNitrous acid is represented by the formula HNO2.
#17
Which ion is commonly associated with the hardening of water?
Carbonate ion (CO3^2-)
ExplanationThe carbonate ion is associated with water hardening.
#18
In the compound C8H18, what type of formula is C8H18?
Molecular formula
ExplanationC8H18 is a molecular formula representing octane.