Answer: d
Explanation:
IT
Answer:
Fossils: 3.5 billion. Rocks: 4.28 billion
they were found during Haden Eon
Explanation:
Transition metal which possesses smallest atomic mass is scandium.
The transition metals are defined as the elements in which atoms are present whose d-sub-shell is partially filled .Due to which they give rise to cations with an incomplete d-sub-shell.
They are also defined as the elements which are present in the d-block of the periodic table, which includes groups from three to twelve.These elements are called transition elements as they show a transition between highly electro-positive group 1 and highly electro-negative group 17 elements.
They have characteristic properties due to which they can exist in variable oxidation states , form colored complexes and have catalytic properties as well.These elements are all technologically very important.
Learn more about transition elements,here:
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Which type of chemical reaction is represented by this equation?
(1) synthesis (2) decomposition
(3) single replacement (4) double replacement
Answer : The correct option is, (1) synthesis
Explanation :
Synthesis reaction : A type of chemical reaction in which multiple reactants combine to form a single product.
It is represented as,
Decomposition reaction : A type of chemical reaction in which a single reactant decomposes into two or more products.
It is represented as,
Single replacement reaction : A type of chemical reaction where the more reactive element replace the less reactive element.
It is represented as,
(A is more reactive element and B is less reactive element)
Double replacement reaction : A type of chemical reaction in which a positive cation and a negative anion of two reactants exchange their places to form two new products.
It is represented as,
(A and C are the cations, B and D are the anions)
The given balanced reaction is,
The given reaction is an example of synthesis reaction in which lithium combine with the nitrogen to form a single product as lithium nitride.
Hence, the correct option is, (1) synthesis reaction
b. Add a catalyst
c. Decrease the pressure
d. Use larger pieces of solid reactants
e. Decrease the concentration of the reactants
(1) C6H12O6 (3) CaCl2
(2) CH3OH (4) CCl4