Chapter 2 Homework Flashcards
Hydrocarbons contain only hydrogen and carbon. Which of the following is not a class of pure hydrocarbons?
Alcohols
The iron(III) ion, Fe3+, will combine with the sulfate ion, SO42−, to form an ionic compound. What is the expected chemical formula and name for this ionic compound?
Fe2(SO4 )3; Ferric sulfate
Titanium will form the cation Ti4+. What is the formula for the ionic compound titanium(IV) oxide, the white pigment in paint?
TiO2
C2H2 is a chemical formula for acetylene. Which type of chemical formula is this?
A molecular formula
NH4+ is an example of
a cation.
When Millikan analyzed the charge of the oil drops, he found that the values were ___________ .
whole-number multiples of a fundamental unit of charge
Calcium and oxygen combine in a 1:1 ratio. Which of the following pairs of elements likely combines in a 1:1 ratio?
strontium (Sr) and sulfur (S)
A new element is discovered that shows no reactivity. This element probably belongs in the same group as _____.
neon
Lithium combines with fluorine in a 1:1 ratio. Which of the following pairs of elements also combines in a 1:1 ratio?
potassium (K) and bromine (Br)
A mass spectrometer experiment reveals peaks that correspond to masses of 23 g / mol, 37 g / mol, 38 g / mol, 52 g / mol, and 75 g / mol for a pure sample. What is the likely molecular mass of the sample?
75 g / mol
How many neutrons are in the nucleus of an atom of calcium-43?
23
The mass of an atom is _____ the sum of the masses of the subatomic particles of which it is composed.
slightly less than
How many carbon atoms are in one molecule of methane?
one
What can you tell about this molecule by looking at its structure?
- It will have the prefix eth- in its name.
- It is an alcohol.
- It will have the suffix -ol in its name.
Which of the following is an alkene with 5 carbon atoms?
Pentene