Which of the following can be classified as a pure compound?
Choose one answer. a. iodine, I2
b. sugar, C12H22O11
c. mercury, Hg
d. alcohol in water, C2H5OH in H2O
e. carbon, C
I2 is an element.
Sugar is a compound.
Mercury is an element.
Alcohol in water is a compound in another compound but neither one is pure since they are mixed.
Carbon is an element.
Alcohol in water is a compound in another compound but neither one is pure since they are mixed.
The correct answer is b. sugar, C12H22O11.
Sugar, C12H22O11, is a pure compound because it consists of a fixed ratio of carbon, hydrogen, and oxygen atoms. It cannot be separated into simpler substances by physical means.
To determine which of the given options can be classified as a pure compound, we need to understand what a pure compound is. A pure compound is a substance that consists of only one type of molecule. Let's analyze each option:
a. Iodine, I2: Iodine is made up of two iodine atoms chemically bonded together, forming a molecule of I2. Since it consists of only one type of molecule, iodine, I2 can be classified as a pure compound.
b. Sugar, C12H22O11: Sugar, also known as sucrose, is a complex molecule made up of carbon, hydrogen, and oxygen atoms in a specific ratio. It consists of multiple types of atoms bonded together, so sugar, C12H22O11, cannot be classified as a pure compound.
c. Mercury, Hg: Mercury is an element, meaning it consists of only one type of atom. Since it is made up solely of mercury atoms, mercury, Hg, can be classified as a pure compound.
d. Alcohol in water, C2H5OH in H2O: This option is a mixture of two compounds – alcohol (C2H5OH) and water (H2O). Compounds in a mixture retain their individual properties and can be separated by physical means, so the mixture of alcohol in water cannot be classified as a pure compound.
e. Carbon, C: Carbon is an element and consists of only one type of atom. Since it is made up solely of carbon atoms, carbon, C, can be classified as a pure compound.
In conclusion, the options that can be classified as a pure compound are:
a. Iodine, I2
c. Mercury, Hg
e. Carbon, C