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SHORT ANSWER QUESTIONS Question 1. Define element, compound and mixture. Question 2. What are pure substance? Give two examples of metals. Question 3. What are metals? Given two examples of metals. Question 4. Which method can be used to separate a mixture of naphthalene and common salt? Question 5. Define homogeneous and heterogeneous mixtures. Question 6. Classify the following into elements, compounds and mixtures. a.Sodium b.Soil c.Sugar solution d.Silver e.Calcium carbonate f.Tin Question 7. Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar Question 8. Classify the following elements as metal, nonmetal, or metalloid: aluminum, fluorine, gallium, phosphorus, krypton, tellurium, thorium, barium and strontium. Question 9. Give the names of the elements present in the following compounds: a.Quicklime b.Hydrogen bromide c.Baking soda d.Potassium sulphate Question 10. Can an element be distinguished from its compound by examination of its physical properties only? Explain. Question 11. Explain why, water is a compound and not a mixture? Question 12. How do the properties of a mixture differ from the properties of the components of the mixture?
Answers
Answer:
1.Compound: two or more different atoms bonded together. Mixture: two or more different atoms together but not joined. Molecule: two particles (same or different) bonded together. Element: only 1 type of atom; this definition is applied to things both bonded and not to itself.
2.Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.
3.A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable or ductile. examples-steel,brass
4.Sublimation
5.Homogeneous and heterogeneous mixtures. ... A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. Conversely, a heterogeneous mixture has components in which proportions vary throughout the sample.
6.elements-sodium,silver,tin
mixtures- soil,sugar solution
compound- calcium carbonate
7.Homogeneous mixtures: Soda water, air, vinegar and filtered tea. Heterogeneous mixtures: wood and soil.
8.Metals:- Aluminium, Gallium, Barium, Strontium
Non Metals:- Phosphorus, flourine,
Metalloids:- Tellurium, Thorium, Krypton
9.Quick limeCaOCalcium, Oxygen Hydrogen bromide HBrHydrogen, Bromine Baking powderNaHCO3Sodium, Hydrogen, Carbon, Oxygen Potassium sulphateK2SO4 Potassium, Sulphur, Oxygen
10.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
11.Water is formed by the chemical bond between 2 hydrogen and one oxygen atom. A bond between atoms of water can be broken by chemical reaction. ... Hence, water is a compound because it can only be separated into hydrogen and oxygen atom by chemical reaction.
12.The proportion of the components is variable. Seawater: A mixture of various salt and water. ... Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture. Heterogeneous mixtures examples: air, oil, and water, etc.
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