Write chemical equations for the reaction of calcium with the following substances, ensuring that the numbers and kinds of atoms are the same on both sides of the equations. If no reaction occurs, write N.R. (a) H2O (b) He

Verified step by step guidance

Step 1: Identify the reactants and products for the reaction of calcium with water (H2O). Calcium (Ca) reacts with water to form calcium hydroxide (Ca(OH)2) and hydrogen gas (H2).

Step 2: Write the unbalanced chemical equation for the reaction between calcium and water: Ca + H2O → Ca(OH)2 + H2.

Step 3: Balance the chemical equation by ensuring the number of atoms of each element is the same on both sides. Start by balancing the calcium atoms, then the hydrogen atoms, and finally the oxygen atoms.

Step 4: For the reaction of calcium with helium (He), consider the chemical properties of helium. Helium is a noble gas and is chemically inert, meaning it does not react with calcium. Therefore, write N.R. (No Reaction) for this part.

Step 5: Review the balanced equation for the reaction with water to ensure all atoms are balanced and confirm the lack of reaction with helium.

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Chemical Reactions

A chemical reaction involves the transformation of reactants into products, characterized by the breaking and forming of chemical bonds. In a balanced chemical equation, the number of atoms for each element must be the same on both sides, adhering to the law of conservation of mass. Understanding how different substances interact is crucial for predicting the outcomes of reactions.

Reactivity of Elements

The reactivity of an element refers to its tendency to undergo chemical reactions, influenced by its electron configuration. For example, calcium is a highly reactive alkaline earth metal that readily reacts with water to form calcium hydroxide and hydrogen gas. However, noble gases like helium are generally inert and do not participate in chemical reactions under standard conditions.

Balancing Chemical Equations

Balancing chemical equations is the process of ensuring that the number of atoms of each element is equal on both sides of the equation. This is achieved by adjusting the coefficients of the reactants and products. A balanced equation reflects the conservation of mass and allows for accurate stoichiometric calculations in chemical reactions.

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Textbook Question

The industrial production of hydriodic acid takes place by treatment of iodine with hydrazine (N2H4):2 I2 + N2H4 --> 4 HI + N2(a) How many grams of I2 are needed to react with 36.7 g of (N2H4)?

Textbook Question

Write chemical equations for the reaction of potassium with the following substances, making sure that the numbers and kinds of atoms are the same on both sides of the equations. If no reaction occurs, write N.R.

(a) H2O

Textbook Question

Write chemical equations for the reaction of calcium with the following substances, making sure that the numbers and kinds of atoms are the same on both sides of the equations. If no reaction occurs, write N.R.

Textbook Question

(d) O₂