Question

every compound can be represented by a chemical formula. a chemical formula is the set of symbols showing the elements that make up a compound and their proportions. waters chemical formula is h₂o. that means a molecule of water contains two atoms of hydrogen and one atom of oxygen chemically bonded. a molecule is a group of two or more atoms bonded together. molecules can range in size from two to thousands of atoms. a molecule of a compound is the smallest unit of that compound. every molecule of water has all the physical and chemical properties of water. thats because every molecule of water is made of the same elements in the same proportions: two hydrogen atoms and one oxygen! which of the following is a true statement? choose one option a every molecule of the same compound will have different properties. b every molecule of a compound has the same proportion of elements. c molecules can be physically separated into smaller units of a compound. d molecules cannot be represented by chemical formulae.

Explanation:

• Option A: The text states "Every molecule of water has all the physical and chemical properties of water", so molecules of the same compound have the same properties. This option is false.
• Option B: "Every molecule of water is made of the same elements in the same proportions: two hydrogen atoms and one oxygen". This implies that for a compound, every molecule has the same proportion of elements. This option is true.
• Option C: The text says "A molecule of a compound is the smallest unit of that compound", so they cannot be physically separated into smaller units of the compound. This option is false.
• Option D: "Every compound can be represented by a chemical formula" and molecules are of compounds. So molecules can be represented by chemical formulae. This option is false.

Answer:

B. Every molecule of a compound has the same proportion of elements.