A) [tex]$C + O _2 \longrightarrow CO _2$[/tex]
[tex]$BN _2+ O _2 \rightarrow 2 NO$[/tex]
C) [tex]$Zn +2 HCl \longrightarrow ZnCl _2+ H _2$[/tex]
D) [tex]$CaO + H _2 O \longrightarrow Ca ( OH )_2$[/tex]
Short answer type questions:
a. What are reactants and products?
b. What is a balanced chemical equation?
c. Write down the balanced chemical equation of the reaction between zinc and hydrochloric acid. What type of chemical reaction is this?
d. What is endothermic reaction?
Answer (2)
Reactants are starting materials, and products are formed substances.
A balanced equation has equal atoms of each element on both sides.
Zinc and hydrochloric acid react as: Z n + 2 H Cl ⟶ Z n C l 2 + H 2 (single displacement).
An endothermic reaction absorbs heat.
Explanation
Introduction Let's break down these chemistry questions one by one!
Reactants and Products a. Reactants are the substances that start a chemical reaction. They are the ingredients you begin with. Products are the substances that are formed as a result of the chemical reaction. They are what you end up with after the reaction takes place.
Balanced Chemical Equation b. A balanced chemical equation is a representation of a chemical reaction where the number of atoms of each element is the same on both the reactant and product sides. This follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Balancing ensures that the number of atoms for each element is equal on both sides of the equation.
Reaction of Zinc and Hydrochloric Acid c. The balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl) is: Z n + 2 H Cl ⟶ Z n C l 2 + H 2 This is a single displacement reaction (also called single replacement reaction) because zinc displaces hydrogen in hydrochloric acid.
Endothermic Reaction d. An endothermic reaction is a chemical reaction that absorbs heat from its surroundings. In other words, it requires energy in the form of heat to proceed.
Summary of Answers In summary: a. Reactants are the starting materials, and products are the substances formed in a chemical reaction. b. A balanced chemical equation has the same number of atoms of each element on both sides. c. The balanced equation for zinc and hydrochloric acid is Z n + 2 H Cl ⟶ Z n C l 2 + H 2 , which is a single displacement reaction. d. An endothermic reaction absorbs heat.
Examples
Understanding chemical reactions is crucial in many real-world applications. For example, in the production of medicines, chemists need to carefully balance chemical equations to ensure the correct amounts of reactants are used to produce the desired product. Similarly, in environmental science, understanding endothermic and exothermic reactions helps in developing technologies to reduce pollution and manage energy consumption. Even in cooking, chemical reactions play a vital role, such as the Maillard reaction that gives browned food its distinctive flavor.
Reactants are the starting materials of a reaction, while products are what are formed. A balanced chemical equation maintains equal atoms of each element on both sides, such as Z n + 2 H Cl ⟶ Z n C l 2 + H 2 , which is a single displacement reaction. An endothermic reaction absorbs heat from its surroundings.
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