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Academic Questions in Chemistry

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With regards to redox reactions, which of the following statement is wrong?

  • A. Redox reaction are examples of chemical change

  • B. Reduction is the gain of electron

  • C. Substances that donates election during chemical reaction are termed reductants

  • D. Oxidizing agents are always reduced in chemical reactions

  • E. Oxidation occurs at the cathode in electrolysis

  • F. Hydrogen is a reducing agent

In chemistry, physical change is associated only with the rearrangement of molecules while the internal composition of the substance remains the same.

  • A. True

  • B. False

_____ electron(s) is a term that describes the number of electron(s) in the outermost shell of an atom.

  • A. Outer

  • B. Excess

  • C. Valence

  • D. Positive

  • E. Negative

  • F. Last

_____ is the negative electrode in electrolysis.

  • A. Anode

  • B. Anion

  • C. Cathode

  • D. Cation

  • E. Ion

  • F. Electrolyte

Electrovalent Bond - Len Academy

The above diagram shows the _____ type of bond.

  • A. Covalent

  • B. Polar covalent

  • C. Coordinate covalent

  • D. Metallic

  • E. Van dear walls

  • F. Ionic

Gas laws in chemistry Charles's law explained Calculation questions on Charles's law Examples of Charles's law in real life Boyle's law explained Calculation questions on Boyle's law Examples of Boyle's law in real life Summary on the kinetic molecular theory of gases Postulates of kinetic theory of gases Avogadro's number explained with worked examples Mole and Avogadro's Number explained Le Chatelier's Principle: Changes in concentration and pressure in dynamic equilibrium Chemical Equilibrium: Dynamic Equilibrium in Chemistry Static and Dynamic Equilibrium explained with their differences Chemistry Scheme of Work, SS1, First Term Chemistry Scheme of Work, SS1, Second Term Chemistry Scheme of Work, SS1, Third Term Compounds in Chemistry: Characteristics of Compounds Types of Mixture: Homogenous and Heterogeneous Mixtures What are mixtures? Characteristics of mixtures Physical properties of matter Chemical properties of matter explained with examples Differences between physical and chemical change in chemistry Ionic Theory and Electrolysis Physical and Chemical Properties of Acids States of Matter: Characteristics of Solids Liquid state of matter: Characteristics of liquids Gaseous state of matter: Characteristics of gases Molar Mass, worked examples and differences with molecular mass What are Elements? Characteristics of Elements What are salts in chemistry? Types of salt in chemistry Mixtures: Separation of Mixtures Separation of Mixtures Mixtures: Separation Techniques Physical Change and Chemical Change in Chemistry Concept of Ions and Electrolytes Grahams law of diffusion: Worked example and importance Metals: Physical Properties of Metals Daltons Atomic Theory and its Modifications Periodic Table: Classification of elements on the periodic table

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Below are the physical properties of metals:

  1. They exist in solid state.

  2. The have high densities.

  3. They are good conductors of heat and electricity.

  4. The have the ability to be polished, to glow, sparkle and reflect light.

  5. They can be bent, flattened and made into sheets called foils.

  6. They can be drawn into wires.

  7. Iron undergoes magnetism while most metals are poorly magnetized.

  8. They typical have high melting point.

  9. They generally have high boiling point.

  10. With the exception of lithium, sodium and potassium, most metals are generally hard.

  11. They have the ability to make sound when in contact with other objects or metals.

  12. Please read details on the physical properties of metals here