Podcast
Questions and Answers
What is one of the examples given in the text where a chemical change occurs?
What is one of the examples given in the text where a chemical change occurs?
- Leaving milk at room temperature during summers
- Burning magnesium ribbon (correct)
- Respiring
- Cooking food
What is the nature of the initial substance when a chemical change occurs?
What is the nature of the initial substance when a chemical change occurs?
- It completely changes
- It partially changes (correct)
- It becomes unrecognizable
- It remains the same
What is the purpose of burning magnesium ribbon in the activity described in the text?
What is the purpose of burning magnesium ribbon in the activity described in the text?
- To create ash for another experiment
- To produce heat
- To measure the energy produced
- To observe a chemical change (correct)
Which statement best describes the difference between physical and chemical changes?
Which statement best describes the difference between physical and chemical changes?
How does the text suggest recognizing when a chemical reaction has taken place?
How does the text suggest recognizing when a chemical reaction has taken place?
What would be an example of a physical change based on the given text?
What would be an example of a physical change based on the given text?
What is the chemical name of the white powder formed when magnesium ribbon burns in air?
What is the chemical name of the white powder formed when magnesium ribbon burns in air?
Which of the following observations helps to determine whether a chemical reaction has taken place?
Which of the following observations helps to determine whether a chemical reaction has taken place?
In a word-equation, where are the reactants written?
In a word-equation, where are the reactants written?
What is the chemical equation for the reaction between magnesium and oxygen?
What is the chemical equation for the reaction between magnesium and oxygen?
What can make chemical equations more concise and useful?
What can make chemical equations more concise and useful?
What substance is formed when lead nitrate solution is mixed with potassium iodide solution?
What substance is formed when lead nitrate solution is mixed with potassium iodide solution?
What is formed by the action of dilute sulphuric acid on zinc?
What is formed by the action of dilute sulphuric acid on zinc?
Which of the following is NOT an observation that helps determine whether a chemical reaction has taken place?
Which of the following is NOT an observation that helps determine whether a chemical reaction has taken place?
$2 \times 3$
$2 \times 3$
