Identify the materials if it a mixture or pure substance. Write your answer in your notebook. Give the reason for your answer. Material Mixture or Pure Substance/ Why 1. orange juice 2. halo-halo HALO HALO 3. Carbon atom 6 2s22p2 C Carbon 12.0107 4. steel 5. sugar SUGAR
The Correct Answer and Explanation is:
Answers:
- Orange juice – Mixture
Why: Orange juice contains water, sugars, vitamins, pulp, and sometimes added flavorings or preservatives. These components are not chemically bonded and can vary in amount. - Halo-halo – Mixture
Why: Halo-halo is a Filipino dessert made of crushed ice, milk, beans, jellies, fruits, and other sweet ingredients. These parts are physically combined and can be separated. - Carbon atom (C) – Pure Substance
Why: A carbon atom is an element, meaning it consists of only one type of atom. It is a pure substance because it cannot be broken down by physical means. - Steel – Mixture
Why: Steel is an alloy made mainly of iron and carbon, sometimes with other elements. These elements are combined physically and uniformly but not chemically bonded as in compounds. - Sugar (sucrose) – Pure Substance
Why: Sugar (commonly sucrose) is a compound with a fixed chemical formula (C₁₂H₂₂O₁₁). It is a pure substance because it is made of the same molecules throughout.
Explanation:
In chemistry, matter is classified as either pure substances or mixtures based on its composition. Pure substances have a fixed composition and distinct chemical properties. They are either elements (like carbon) or compounds (like sugar). An element is made of only one type of atom, and a compound is made of two or more atoms chemically bonded in a specific ratio. These cannot be separated by physical methods.
On the other hand, mixtures consist of two or more substances physically combined. They retain their individual properties and can be separated by physical means like filtration or evaporation. Mixtures can be homogeneous (uniform throughout, like steel) or heterogeneous (not uniform, like halo-halo).
For example, orange juice contains pulp, water, and sugars — a typical heterogeneous mixture. Halo-halo is even more visibly a heterogeneous mixture, with different ingredients layered and mixed but not chemically bonded. Steel, though it appears uniform, is a homogeneous mixture (alloy) of iron and carbon. Carbon is a pure substance and an element with all atoms of the same kind. Sugar (sucrose), while made of different atoms, has a constant composition and is a compound, thus a pure substance.
Understanding these classifications helps in separating materials, predicting reactions, and identifying substances in everyday life and scientific study.
