Question

test your knowledge 2
classify each substance as an element, compound, heterogeneous mixture, or homogeneous mix
ch₄
grape juice
kbr
oil and vinegar
p

Explanation:

• \(CH_4\) (Methane): It is composed of carbon and hydrogen atoms chemically bonded together. By definition, a compound is a substance formed when two or more elements are chemically bonded. So, \(CH_4\) is a compound.
• Grape juice: It contains water, sugars, vitamins, etc. that are uniformly distributed at a molecular level. A homogeneous mixture has a uniform composition throughout. So, grape juice is a homogeneous mixture.
• \(KBr\) (Potassium bromide): It is made up of potassium and bromine chemically combined. According to the compound's definition (elements chemically bonded), \(KBr\) is a compound.
• Oil and vinegar: Oil and vinegar do not mix uniformly; they form separate layers. A heterogeneous mixture has a non - uniform composition. So, oil and vinegar is a heterogeneous mixture.
• \(P\) (Phosphorus): It is made up of only phosphorus atoms. An element is a pure substance consisting of only one type of atom. So, \(P\) is an element.

Answer:

• \(CH_4\): Compound
• Grape juice: Homogeneous mixture
• \(KBr\): Compound
• Oil and vinegar: Heterogeneous mixture
• \(P\): Element