State whether these items are metal or non metal, provide a reason why. 1. Electrical wires
2. Door handles
3. Radiator
4. Shelves in the chemical cupboard

please help!

1. Metal.

Electrical wires are used to conduct electricity. Electrons have to flow through the wires in order to run the circuit. Only metals provide delocalized electrons that are free to move.

2. Metals, (usually)

Door handles should be strong that doesn't break easily. Metals are durable and corrosion resistant. Some metal alloys (like brass) are also found to be self-disinfecting.

3. Metals.

Radiators are usually used for emitting heat. Metals are good conductors of heat, which makes them great for making radiators.

4. Metals, (usually)

Most metals used for making chemical cupboard shelves are corrosion resistant, which causes less damage when chemical was spilled.

1.Electrical wires - metals

They r used to conduct and transfer electricity from one place to another and therefor need to be made of metals [like copper] as they hv high electrical conductivity

Door handles - metals

They need to be corrosion resistant so dat they last longer and also there r smooth which makes it easier to hold them.

3.Radiator - metals

They r used for heat transformation and therefore they need to be made of metals as they hv high thermal conductivity [heat conductivity]

4.Shelves in the chemical cupboard - non metals

They need to be made of non metals as metals r reactive to chemicals and holes can be formed on them if a drop or two of chemicals fall on them.

Hope this helps

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.