Activity 1:
Construct the following table in your book.
Create a table with each chemical compound. For each chemical compound, record its colour with Universal Indicator, pH, what type of bonding is present in the chemical (ionic or covalent) and why the chemical is acidic, basic or neutral. Use the table scaffold from the board.
Activity 2:
Use your textbook (Ex 8.7) to answer the following questions on corrosion
Q1) What is a corrosion reaction?
Q2) What substance in water and air reacts with metal to corrode it
Read 7.3 Damp and Oxygen on the following website:
http://www.hobson.com.au/files/other/bumax-why-does-rust-occur.pdf
Q3) What percentage of moisture in the air is required for corrosion to occur?
Q4) Why can metals corrode if the moisture is less than 60%?
Q5) Why do cars, bike spokes and other metals corrode at a faster rate near the beach than in the desert?
Q6) Look at the image at the bottom of 7.4 When Steel Rusts which illustrates the reactivity of different metals.
Q7) What does inert mean?
Q8) Which material is the least reactive?
Q9) Stainless steel is an alloy composed mainly of iron and other materials to make it less reactive. Research what is an alloy?
Q10) Sacrificial anodes are reactive metals placed on another metal which are used to protect a more valuable metal such as iron in steel from corroding. Consider that steel is used to construct large navy ships. Why then would ships have zinc and magnesium sacrificial anodes placed on the hull?
Use your reasoning skills
Q11) The main mineral mined for iron is hematite which consists of iron and oxygen as an iron oxide. Subsequently, most iron ore is orange/rusty in colour. What then happens when iron nails react with orxygen in the air?
Q12) Food like tomatoes can go off if they are left for too long either on the bench or in the refrigerator. Why then, do semi-dried tomatoes stay fresh and edible for a lengthy period of time?
Construct the following table in your book.
Create a table with each chemical compound. For each chemical compound, record its colour with Universal Indicator, pH, what type of bonding is present in the chemical (ionic or covalent) and why the chemical is acidic, basic or neutral. Use the table scaffold from the board.
Activity 2:
Use your textbook (Ex 8.7) to answer the following questions on corrosion
Q1) What is a corrosion reaction?
Q2) What substance in water and air reacts with metal to corrode it
Read 7.3 Damp and Oxygen on the following website:
http://www.hobson.com.au/files/other/bumax-why-does-rust-occur.pdf
Q3) What percentage of moisture in the air is required for corrosion to occur?
Q4) Why can metals corrode if the moisture is less than 60%?
Q5) Why do cars, bike spokes and other metals corrode at a faster rate near the beach than in the desert?
Q6) Look at the image at the bottom of 7.4 When Steel Rusts which illustrates the reactivity of different metals.
Q7) What does inert mean?
Q8) Which material is the least reactive?
Q9) Stainless steel is an alloy composed mainly of iron and other materials to make it less reactive. Research what is an alloy?
Q10) Sacrificial anodes are reactive metals placed on another metal which are used to protect a more valuable metal such as iron in steel from corroding. Consider that steel is used to construct large navy ships. Why then would ships have zinc and magnesium sacrificial anodes placed on the hull?
Use your reasoning skills
Q11) The main mineral mined for iron is hematite which consists of iron and oxygen as an iron oxide. Subsequently, most iron ore is orange/rusty in colour. What then happens when iron nails react with orxygen in the air?
Q12) Food like tomatoes can go off if they are left for too long either on the bench or in the refrigerator. Why then, do semi-dried tomatoes stay fresh and edible for a lengthy period of time?