18 Questions
Which of the following statements is correct regarding the process of biogas production by anaerobic bacteria?
Process – A involves a chemical change.
Why does adding cooking oil to water in bottle C create a change that is different from the other two bottles?
The oil causes a chemical reaction
What is the outcome when the gas produced from the cylinder burns?
The gas combines with oxygen to form new substances
What happens to the iron nails left in the bottles after being observed for a few days?
The nails rust
Which of the following is true about lime water used to test for carbon dioxide?
Lime water bubbles when carbon dioxide is added
Upon burning, what type of change occurs in biogas used as fuel?
A chemical change
What is a common characteristic of a chemical change?
Formation of a new substance
Which process is an example of a chemical change?
Burning of coal
What indicates that the burning of a substance is a chemical change?
Production of heat
Which situation involves the formation of new substances?
Spoiled food producing a foul smell
What occurs when an acid is neutralized with a base?
Formation of water and salt
Which process involves the breakdown of ozone into oxygen?
Protection from ultraviolet radiation
Why does ultraviolet radiation not harm the earth's surface?
Because ozone absorbs it, acting as a shield.
In the equation for rusting of iron, what is the role of water (H2O)?
It combines with oxygen to form iron oxide (rust).
How does the presence of moisture in the air affect the process of rusting?
It speeds up the process of rusting.
What is a common method to prevent rusting of iron articles?
Applying a coat of paint or grease on the iron surface.
How does galvanization help prevent rusting of iron?
By reacting with oxygen in the air and forming a protective layer.
Which process can be compared to photosynthesis in terms of being a chemical change?
The digestion of food.
Test your knowledge on chemical changes with this quiz! Determine whether given processes are chemical changes or not based on the descriptions provided.
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