Chemical Reactions and Equations

Flashcards about chemical reactions and equations

What is Chemistry?

The branch of science dealing with the composition, properties, and changes of matter.

What is a Chemical Reaction?

A representation of a chemical change using a chemical equation.

What are Reactants and Products?

Reactants are substances taking part in a chemical change, while products are substances produced as a result of the chemical change.

What is the Conclusion of Activity 1.1?

Burning of magnesium in oxygen to form magnesium oxide.

What is the Conclusion of Activity 1.2?

The reaction between lead nitrate and potassium iodide, forming lead iodide and potassium nitrate. A yellow precipitate of lead iodide forms.

What is the Conclusion of Activity 1.3?

The reaction between zinc and dilute hydrochloric acid or sulfuric acid, producing hydrogen gas and zinc chloride or zinc sulfate. This is a displacement reaction and an exothermic process.

What are the characteristics of a chemical reaction?

Change of state, change of color, evolution of gas, energy changes, and formation of precipitate.

What is a Chemical Equation?

A symbolic notation that uses formulae of compounds and symbols of elements to represent a chemical reaction.

What are the Types of Chemical Equations?

Word equation, Symbol equation and Balanced chemical equation

What is Balancing of Chemical Equations?

Making the number of different types of elements equal on both sides of the equation.

What are the Types of Chemical Reactions?

Combination reactions, Decomposition reactions, Displacement reactions and Double displacement reactions

What is Combination Reaction?

A union of two or more substances to form a new substance.

What is the Conclusion of Activity 1.4?

The reaction between calcium oxide and water, forming calcium hydroxide (slaked lime) and releasing heat.

What is Decomposition Reaction?

Breaking up of a substance into simpler compounds.

What is the Conclusion of Activity 1.5?

Heating of ferrous sulphate is a thermal decomposition reaction because ferrous sulphate breaks down into simpler compounds Fe2O3, SO2 and SO3.

What is the Explanation of Activity 1.6?

Lead nitrate on heating decomposes to lead monoxide (yellow), brown gas nitrogen dioxide (NO2) and oxygen gas are evolved.

What is the Conclusion of Activity 1.7?

Water, on electrolysis decomposes to hydrogen gas and oxygen gas. Hydrogen gas burns explosively whereas oxygen gas helps in burning, i.e., hydrogen is highly combustible and oxygen is supporter of combustion.

What is the Conclusion of Activity 1.8?

Decomposition of AgCl in the presence of Sunlight is photochemical decomposition reaction.

What is Displacement Reaction?

It involves displacement of one of the constituents of a compound by another substance and may be regarded as a displacement reaction.

What is the Conclusion of Activity 1.9?

Iron is more reactive than copper because iron can displace copper from copper sulphate solution. It is an example of displacement reaction.

What is Double Displacement Reaction?

It is mutual exchange of the radicals of two compounds taking part in the reaction and results in the formation of two new compounds.

What is the Conclusion of Activity 1.10?

Reaction between sodium sulphate and barium chloride is double displacement reaction.

What is Oxidation?

A chemical reaction in which there is a gain of oxygen or any electronegative radical or a loss of hydrogen or electropositive radical.

What is Reduction?

A chemical reaction in which there is a gain of hydrogen or any electropositive radical or a loss of oxygen or electronegative radical.

What is the Conclusion of Activity 1.11?

The reaction between copper oxide and hydrogen is redox reaction. Copper oxide is oxidising agent whereas hydrogen is reducing agent.

What is Corrosion?

The process of slow eating up of the surfaces of certain metals when kept in open for a long time.

What is Rancidity?

When the fats and oils present in butter and margarine are oxidised, they become rancid. As a result, their smell and taste change. They become quite unpleasant.