Answer:
(a):Valency is the measure of the capacity of an atom of a single element to react and combine with particular numbers of atoms of another element.
(b):
Valency of calcium:+2
Valency of Iron:Iron exhibits 2 valence states of +2 and +3.
Valency of hydroxl:-1
Valency of Nitrate:-1
Explanation:
Answer:
D: (700 L / 22.4 L/mol) (4 g/mol)
Explanation:
At STP, Molar volume of a gas = 22.4 L/mol
Now, we are told that helium has a volume of 700 L at STP.
Also, atomic mass of helium = 4 g/mol
Thus, the mass of helium is given as;
(700 L/22.4 L/mol) × 4 g/mol
Q=heat and Q=m*c*dekta(temp)
So we have
Q= 100g*4.184*50=20920J of heat energy
Q= 100g * 0.397* 50= 1985J of heat energy
So the water requires more energy and this is due to the higher heat capacity value of water than the metal sample
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Answer:
A synthesis reaction occurs when two or more reactants combine to form a single product. ... Replacement reactions occur when elements switch places in compounds. In a single replacement reaction, one element takes the place of another in a single compound. In a double replacement reaction, two compounds exchange elements.
Answer:
25.)Intrusive rocks have a coarse grained texture. Extrusive Igneous Rocks: ... Quick cooling means that mineral crystals don't have much time to grow, so these rocks have a very fine-grained or even glassy texture. Hot gas bubbles are often trapped in the quenched lava, forming a bubbly, vesicular texture.
Explanation:
