Font size
WorksheetsGrade 7- Chemistry in everyday life Review
Total questions: 9
Worksheet time: 6mins
When iron reacts to form rust, what does it react with? Select all that apply.
Nitrogen
Oxygen
Water
Carbon dioxide
What is the substance present in hand warmers that react with air to warm the hands during winter?
Copper powder
sodium
iron fillings
Salt
Reaction of food with oxygen can cause it to go bad. How to prevent this?
Add antioxidant
Add sugar or salt
Cook it throughly
add more fats
what are the reactants in respiration? Select all that apply.
Glucose
water
carbon dioxide
oxygen
Photosynthesis and Respiration both occur in plants.
True
False
Combustion and burning are the same reaction.
True
False
Light energy is released during combustion, not burning.
True
False
How do we prevent iron objects from rusting? Select all that apply.
Paint it
Use an alloy of iron instead of pure iron
plate it with chromium
galvanize with zinc
Did you understand this topic clearly and fully?
Yes Yes Yes!
Hmmm Not so, still confused
I understand nothing!
