1. An example of a chemical property of formaldehyde (CH2O) is __________ a. it
ID: 836436 • Letter: 1
Question
1. An example of a chemical property of formaldehyde (CH2O) is __________
a.
it is flammable.
d.
it dissolves in water.
b.
it has a density of 1.09 g/mL.
e.
it is a gas at room temperature.
c.
it is colorless.
2.
A reaction vessel contains equal masses of iron and oxygen. How much FeO could theoretically be produced?
a.
an amount equal to the sum of the masses of iron and oxygen
b.
an amount greater than the sum of the masses of iron and oxygen
c.
an amount less than the sum of the masses of iron and oxygen
d.
There is no way to tell.
a.
an amount equal to the sum of the masses of iron and oxygen
b.
an amount greater than the sum of the masses of iron and oxygen
c.
an amount less than the sum of the masses of iron and oxygen
d.
There is no way to tell.
Explanation / Answer
When dissolved in water, formaldehyde forms a hydrate, methanediol, with the formula H2C(OH)2.
A gas at room temperature, formaldehyde is colorless
thre fore all these options are correct
it dissolves in water.
e.
it is a gas at room temperature.
c.
it is colorless.
2. Fe+O = FeO
mass of O = mass of Fe = x gm say
moles of Fe = x/56
moles of O = x/16
Thus, Fe is the limiting reagent, so x/56 moles of FeO will be formed.
mass of FeO = (x/56) * (56+16)gm
b.
an amount greater than the sum of the masses of iron and oxygen
b.
an amount greater than the sum of the masses of iron and oxygen
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