They are called indicators.
It means that papers are better than shoes so it is better to wear out your shoes than your paper
You will need 5 copper coins witch are pennies and 5 non-copper coins witch are dimes, pieces of paper towel and lemon juice. First you take a piece of paper towel and dip it in lemon juice. place it on top of a copper coin. then you take a non-copper coin and place it on top of the paper towel. After, you take a piece of paper towel and put it on top of your non-copper coin. Do the same thing as a pattern until you have used 5 copper coins and 5 non-copper coins. Make sure you have a piece of paper towel in between each coin. Finally, wet each finger tip and hold the ends of your battery. Do you feel a BZZ?
It depends. Is it in a box? othrwise probably not much. These dolls on eBay gor for between 3 and 20 dollars depending on completeness of the outfit, cleanliness and the paper work is not as important because colectors often buy birthcertificate lots.....and use those instead. good luck!
yes the shorter it is and the more lightweight it is the better your tin can telephone will be.
blue
They are called indicators.
You will have made a pH indicator. Just like litmus paper.
You can use litmus paper or purple cabbage juice to test if a substance is acidic or not. Blue litmus paper turns red under acidic conditions. If you search 'litmus paper chart' online you can find some pretty good charts to find just how acid the substance is.
Lemon juice is an acid therefore, it turns blue litmus paper red and red litmus paper remains red
Blue litmus paper would turn red in orange juice.
Lemon juice is an acid and blue litmus paper turns red when dipped in an acidic liquid.
Neither one is better than the other. Man-made and natural pH indicators do virtually the same exact thing, just with different materials.
Which is more accurate- the pH paper or the red cabbage juice and why?
Cabbage solution
The simplest way is to use litmus papers. Acids turn blue litmus paper red; alkalis turn red litmus paper blue. Other ways include the use of indicators such as universal indicator or methyl orange.
Lemon juice contains citric acid so blue litmus paper dipped in lemon juice will turn red indicating that it is acidic.