Answer. Both copper and lead will require equivalent amount of energy.

If 1,000 J of energy is absorbed by a one kilogram block of copper instead of lead then the temperature of the block doesn’t rise as much. From this it can be seen that a change in the temperature of a system depends on: the mass of the material….Specific heat capacity.

Solution. To find: Substance requiring more heat energy. Copper will require more heat energy.

ii) Which will require more energy, heating a 2.0 kg block of lead by 30 K or heating a 4.0 kg block of copper by 5 K? (Scad = 128 J kg ‘K, S. = 387 J kg K-) [Ans: copper]

The Earth’s surface temperature is controlled mainly by solar heating which turns on at dawn and then off at sunset. During the typical day the surface heats and during the night it cools. Changes in the surface temperature heat or cool the air above, which leads to air movement (wind).

Here are just a few everyday demonstrations that temperature changes the rate of chemical reaction: Cookies bake faster at higher temperatures. Bread dough rises more quickly in a warm place than in a cool one. Low body temperatures slow down metabolism.

When energy is released in an exothermic reaction, the temperature of the reaction mixture increases. When energy is absorbed in an endothermic reaction, the temperature decreases. You can monitor changes in temperature by placing a thermometer in the reaction mixture.

Unexpected Temperature Change An example is fireworks, because they ignite and this reaction generates heat as a product. Chemical reaction is a property rearranged to make a new substance; When substances interact to form new substances to form new properties.

It is usually less than the theoretical yield . The reasons for this include: incomplete reactions, in which some of the reactants do not react to form the product. practical losses during the experiment, such as during pouring or filtering.