Mastering the Reaction of WO₃ with H₂: A Guide to IGCSE Chemistry

What is the balanced equation for the reaction of WO₃ with H₂?

• A. WO₃ + H₂ → W + H₂O
• B. WO₃ + 2H₂ → W + 2H₂O
• C. WO₃ + 3H₂ → W + 3H₂O
• D. WO₃ + H₂O → W + H₂

Answer: (C)

The correct balanced equation for the reaction of WO₃ with H₂ is shown by the formula that involves three moles of hydrogen gas reacting with one mole of tungsten trioxide to produce one mole of tungsten and three moles of water. In this reaction, tungsten trioxide (WO₃) is reduced when it reacts with hydrogen (H₂). The reduction process requires sufficient hydrogen to fully convert the tungsten in WO₃ to its elemental form (W) while forming water (H₂O) as a byproduct. The stoichiometry reveals that three moles of hydrogen gas are required to fully reduce one mole of WO₃ since each mole of WO₃ contains three oxygen atoms, resulting in the formation of three moles of water. Correctly balancing the equation reflects the conservation of mass, where the number of each type of atom in the reactants is equal to the number of each type in the products. Here, the three hydrogens from the three moles of water produced line up perfectly with the three moles of hydrogen gas that were originally present. This establishes the stoichiometric balance for the chemical reaction. In contrast, the other options either do not use enough hydrogen molecules to account for the oxygen in the

When it comes to mastering the International General Certificate of Secondary Education (IGCSE) Chemistry exam, understanding chemical reactions is pivotal. One vital reaction to know is the interaction between tungsten trioxide (WO₃) and hydrogen (H₂). This reaction not only showcases key concepts like reduction and stoichiometry but also lays the groundwork for more complex chemistry principles.

So, what's the balanced equation for the reaction of WO₃ with H₂? You might be glad to know that it's WO₃ + 3H₂ → W + 3H₂O. This formula accurately reflects the way substances interact and transform during chemical processes.

Understanding this equation starts with what’s happening at a molecular level. Tungsten trioxide (WO₃) is a compound that contains tungsten and oxygen. In this reaction, the tungsten in WO₃ undergoes a reduction—a process that essentially removes oxygen, transforming it into solid tungsten (W). But here's the kicker: to achieve this transformation, you'll need three moles of hydrogen gas. Why? Because each mole of WO₃ comes with three oxygen atoms, which need to be addressed. When hydrogen gas comes to the party, it bonds with each oxygen atom to create water (H₂O) as a byproduct. This results in the formation of three moles of water.

Balancing chemical equations is like making sure a recipe has the right ingredients and quantities. You've got to ensure that the quantity of reactants equals the quantity of products. In our case, this means that three moles of hydrogen correspond perfectly with the three moles of water produced in the end. Isn’t it fascinating how nature operates on such precise calculations?

Now, let’s briefly touch on the incorrect options. If we consider the alternatives, options such as WO₃ + H₂ → W + H₂O or WO₃ + 2H₂ → W + 2H₂O fall short because they don't account for the oxygen atoms present in WO₃. They simply don’t have enough hydrogen molecules to match the number of oxygen atoms needing reduction. So, if you chose any of those, it's time to rethink your approach!

Why is it important to get this right? For starters, understanding these concepts can boost your confidence come exam time. You see, the IGCSE Chemistry exam isn't just about memorizing facts—it's about applying your knowledge in problem-solving scenarios. The more comfortable you are with equations like this one, the better you’ll perform!

Additionally, chemical equations form the backbone of many scientific disciplines, not just chemistry. Whether you're delving into environmental science, biology, or even engineering, a solid grasp of reactions and stoichiometric principles can provide a strong foundation for more advanced topics.

So, how can you make the most of your study time when focusing on reactions like WO₃ with H₂? Start with plenty of practice problems. Focus on similar balanced equations, and over time, you'll find that recognizing patterns becomes second nature. Ask yourself questions as you work—what happens to the atoms? Where do they go?

Remember, the goal here is to connect the dots between conceptual understanding and mathematical application. And who knows? You might even find that this particular equation leads you down a rabbit hole of discovery in the fascinating world of chemistry.

In summary, mastering the reaction of tungsten trioxide with hydrogen isn’t just a necessity for passing the IGCSE Chemistry exam. It’s a stepping stone to understanding broader scientific concepts and a chance to appreciate the beauty of chemistry at work. So grab those notes, keep practicing, and remember: each reaction tells a story. What will yours be?