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

Name: Chemistry
Author: McMurry
ISBN: 9781292336145

검증된 단계별 안내

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.

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

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.