Podcast
Questions and Answers
Which of the following statements is correct regarding the process of biogas production by anaerobic bacteria?
Which of the following statements is correct regarding the process of biogas production by anaerobic bacteria?
- Process – B involves a physical change.
- None of these processes involve any changes.
- Process – A involves a chemical change. (correct)
- Both processes A and B involve physical changes.
Why does adding cooking oil to water in bottle C create a change that is different from the other two bottles?
Why does adding cooking oil to water in bottle C create a change that is different from the other two bottles?
- The oil turns into a solid
- The oil evaporates quickly
- The oil increases the volume of water
- The oil causes a chemical reaction (correct)
What is the outcome when the gas produced from the cylinder burns?
What is the outcome when the gas produced from the cylinder burns?
- The gas changes color
- The gas undergoes a physical change
- The gas combines with oxygen to form new substances (correct)
- The gas dissolves in water
What happens to the iron nails left in the bottles after being observed for a few days?
What happens to the iron nails left in the bottles after being observed for a few days?
Which of the following is true about lime water used to test for carbon dioxide?
Which of the following is true about lime water used to test for carbon dioxide?
Upon burning, what type of change occurs in biogas used as fuel?
Upon burning, what type of change occurs in biogas used as fuel?
What is a common characteristic of a chemical change?
What is a common characteristic of a chemical change?
Which process is an example of a chemical change?
Which process is an example of a chemical change?
What indicates that the burning of a substance is a chemical change?
What indicates that the burning of a substance is a chemical change?
Which situation involves the formation of new substances?
Which situation involves the formation of new substances?
What occurs when an acid is neutralized with a base?
What occurs when an acid is neutralized with a base?
Which process involves the breakdown of ozone into oxygen?
Which process involves the breakdown of ozone into oxygen?
Why does ultraviolet radiation not harm the earth's surface?
Why does ultraviolet radiation not harm the earth's surface?
In the equation for rusting of iron, what is the role of water (H2O)?
In the equation for rusting of iron, what is the role of water (H2O)?
How does the presence of moisture in the air affect the process of rusting?
How does the presence of moisture in the air affect the process of rusting?
What is a common method to prevent rusting of iron articles?
What is a common method to prevent rusting of iron articles?
How does galvanization help prevent rusting of iron?
How does galvanization help prevent rusting of iron?
Which process can be compared to photosynthesis in terms of being a chemical change?
Which process can be compared to photosynthesis in terms of being a chemical change?
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