Textbook Question
Reaction of A (green spheres) with B (blue spheres) is shown in the following diagram:
Which equation best describes the reaction?
a. A2 + 2 B → A2B2
b. 10 A + 5 B2 → 5 A2B2
c. 2 A + B2 → A2B2
d. 5 A + 5 B2 → 5 A2B2
5. Classification & Balancing of Chemical Reactions
Chemical Reaction: Chemical Change
2:53 minutesProblem 44a
Textbook Question
When sodium metal is placed in water, the following change occurs: Sodium, Na(s) + Water, H2O(l) → Hydrogen, H2(g) + Sodium hydroxide, NaOH(aq)
a. Identify the reactants and products and their physical states
Verified step by step guidance1
Step 1: Identify the reactants in the given chemical equation. Reactants are the substances present on the left side of the arrow. In this case, the reactants are sodium (Na) and water (H₂O).
Step 2: Identify the physical states of the reactants. Sodium (Na) is a solid, denoted as (s), and water (H₂O) is a liquid, denoted as (l).
Step 3: Identify the products in the given chemical equation. Products are the substances present on the right side of the arrow. In this case, the products are hydrogen gas (H₂) and sodium hydroxide (NaOH).
Step 4: Identify the physical states of the products. Hydrogen (H₂) is a gas, denoted as (g), and sodium hydroxide (NaOH) is an aqueous solution, denoted as (aq).
Step 5: Summarize the reactants and products with their physical states: Reactants: Sodium (Na (s)) and Water (H₂O (l)); Products: Hydrogen (H₂ (g)) and Sodium hydroxide (NaOH (aq)).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reactants and Products
In a chemical reaction, reactants are the starting substances that undergo a change, while products are the substances formed as a result of the reaction. In the given equation, sodium (Na) and water (H2O) are the reactants, and hydrogen gas (H2) and sodium hydroxide (NaOH) are the products.
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Physical States
The physical state of a substance indicates its form at a given temperature and pressure, typically categorized as solid (s), liquid (l), gas (g), or aqueous (aq). In the reaction, sodium is a solid (s), water is a liquid (l), hydrogen is a gas (g), and sodium hydroxide is in an aqueous solution (aq).
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Chemical Equation
A chemical equation is a symbolic representation of a chemical reaction, showing the reactants on the left and the products on the right, separated by an arrow. It conveys the conservation of mass, indicating that the number of atoms of each element is the same before and after the reaction, which is essential for balancing the equation.
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