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Why is balancing a chemical equation important?
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Balancing a chemical equation is important to ensure that the same number of atoms of each element are present on both the reactant and product sides, adhering to the law of conservation of mass.
Explain a displacement reaction with an example.
In a displacement reaction, one element displaces another element in a compound. Example: Zn + H2SO4 → ZnSO4 + H2.
What is a neutralization reaction and give an example?
A neutralization reaction occurs when an acid and a base combine to form salt and water. Example: HCl + NaOH → NaCl + H2O.
What causes the rusting of iron and how can it be prevented?
Rusting of iron occurs when iron reacts with oxygen and water. It can be prevented by coating the iron with paint.
What is the significance of observing a color change in a chemical reaction?
A color change signifies a chemical reaction has taken place, often indicating the formation of a new substance with different properties.
Describe a decomposition reaction with an example.
A decomposition reaction is when a compound breaks down into two or more substances. Example: 2H2O → 2H2 + O2.
What role do chemical reactions play in photosynthesis?
In photosynthesis, chemical reactions convert carbon dioxide and water into glucose and oxygen, providing energy for plants.
What type of reaction is represented by: H2 + O2 → H2O?
Combination Reaction, where two or more reactants combine to form one product.
How are chemical reactions vital in medicine and the human body?
Chemical reactions are crucial for processes such as the action of medicines in diseases and oxidation reactions within the body.
Describe a combination reaction with an everyday example.
A combination reaction involves two or more reactants forming one product. Everyday example: Formation of water from hydrogen and oxygen gases.
Give an example of a redox reaction and explain the oxidation and reduction parts.
Example: CuO + H2 → Cu + H2O. CuO is reduced to Cu (by losing oxygen), and H2 is oxidized to H2O (by gaining oxygen).
What happens in a double displacement reaction? Provide an example.
In a double displacement reaction, there is an exchange of ions between two compounds. Example: Na2SO4 + BaCl2 → BaSO4 + 2NaCl.
Define oxidation and reduction in terms of oxygen and hydrogen.
Oxidation is the gain of oxygen or loss of hydrogen. Reduction is the loss of oxygen or gain of hydrogen.
Name four observable signs that indicate a chemical change has occurred.
Change in state, change in color, evolution of gas, and change in temperature.
What is a chemical equation and why are they used?
A chemical equation is a symbolic representation of a chemical reaction. They are used because they provide a short, easy-to-write, and balanced way to understand and represent chemical reactions.
Explain rancidification and a method for its prevention.
Rancidification is the spoiling of oily food. It can be prevented by storing food in airtight containers.
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