1. Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar 2. Classify the following elements as metal, nonmetal, or metalloid: aluminum, fluorine, gallium, phosphorus, krypton, tellurium, thorium, barium and strontium. 3. Given the names of the elements present in the following compounds: a.Quicklime b.Hydrogen bromide c.Baking soda d.Potassium sulphate 4. Can an element be distinguished from its compound by examination of its physical properties only? Explain.
Answers
Answer:
1..A homogeneous mixture has the same uniform composition and appearance.
A heterogeneous mixture consists of visibly different phases or substances.
From the list of given substances,
homogeneous mixture: soda water, wood, air, vinegar and filtered tea .
soil is a heterogeneous mixture.
2.Metals:- Aluminium, Gallium, Barium, Strontium
Non Metals:- Phosphorus, flourine,
Metalloids:- Tellurium, Thorium, Krypton
3..a) Quick lime (b) Hydrogen bromide (c) Baking powder (d) Potassium sulphate. Answer: (a) Quick lime is CaO. Elements present are calcium and oxygen.
4...Element is a single substance but a compound is a mixture of two or more elements. When an element is added with another substance or element, it's physical property changes to convert the element into a compound. Therefore, An element can be distinguished from a compound by observing it's physical property