Answer: The Earth is an oblate spheroid which is more elongated along the equator.
Regions along the equator receives more amount of direct sunlight from the sun causing higher temperatures along the region. While places along the poles receives less amount of heat since heat is scattered in a larger area due to the shape of the Earth around the poles.
Explanation: So places along the equator experiences higher temperature due to the direct hit of sunlight. And places along the polar regions experiences cooler temperature since it receives less amount of sunlight.
Answer:
Alkali Metals: •are placed in group 1, • can be cut with a knife
Halogens: •are placed in group 17, • react vigorously with metals
Explanation:
Alkali metals are the metals found in group 1 of the periodic table. They have one outermost shell electron. They react with cold water vigorously to form alkalis and liberate hydrogen gas as well. They are very reactive metals and their reactivity increases on going down the group. They are soft and can be cut with a knife. Examples of alkali metals are lithium, sodium,potassium, rubidium,caesium, francium.
The Halogens are reactive non-metals placed in group 17 of the periodic table. They have seven outermost shell electrons. They are the most reactive non-metals react vigorously with metals by to form ionic compounds. They exist as diatomic molecules. They are found in nature mainly as salts because of their reactivity. Their reactivity decreases on going down the group. Examples of the halogens include fluorine, chlorine, bromine, iodine and astatine.
The mass of 0.5 moles of the element : 60.241 g
<h3>Further explanation</h3>
Given
mass of 2 x 10²¹ number of atoms of an element is 0.4 g
Required
the mass of 0.5 mole
Solution
Find relative atomic mass of the element(Ar)
mol of 2 x 10²¹ atoms :
the mass of 0.5 moles :
Answer:
The answer here would be 3, energy efficient appliances.
Explanation:
Energy efficient players are made to reduce the amount of energy used, which in turn reduce overall energy demand.
