1. Steel was first used by humans as a substitute for stone in the Neolithic period,
2.Gold is the element used in developing photographic negatives
3.Lime juice contains citric acid.
4. Substances such as caustic soda and baking soda are bases, chemical opposites
of acids.
5.Paper chromatography is the method used to separate chemical mixtures on the
basis of colour
6. Glycogen is the common name for ethylene glycol.
7.Air is an element.
8. Nitrous oxide is also known as laughing gas.
9. Rock salt is a mixture of common salt and artificial food colouring
10.The molecules in a gas move in only one direction
Who will Answer First I will mark branliest him/her
Answer in True or False
Answers
Answer:
Explanation:
1. Copper, lead, silver and gold were the metals that attracted the interest of the Neolithic producer due to their bright colour and the way they could easily be shaped by simple hammering. As in the Near East and Asia Minor, metals were initially used in Greece as well for the manufacture of jewellery.
2.The white coloured compound which is used in the conversion process or the development process of negative image to a coloured aka the regular image is Silver Halide. The compound can be either of the three Ag( Silver)+ Halide or halogen. Here the halogens are Chloride, Bromide or the Iodide
3, Lemon juice and lime juice are rich sources of citric acid, containing 1.44 and 1.38 g/oz, respectively. Lemon and lime juice concentrates contain 1.10 and 1.06 g/oz, respectively. The citric acid content of commercially available lemonade and other juice products varies widely, ranging from 0.03 to 0.22 g/oz.
Answer:
1- False (Copper was First used by Humans)
2- False (Silver)
3- True
4- True
5- True
6- False(antifreeze is the common name )
7- False (Air is mixture of many different elements and compounds )
8- True
9- False
10- False (They move in random direction)
Explanation: