Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two metals?A) The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.
B) The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.
C) The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.
D) The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.
Answers
Answer: The correct answer is Option A.
Explanation:
Chemical reactivity is defined as the tendency of an atom to loose or gain electrons.
Metals are the elements that looses electrons and thus, their chemical reactivity will be the tendency to loose electrons.
Their chemical reactivity decreases as we move from left to right in a period. This is so because, the electron get added up in the same shell. So, the electron in the outermost orbital gets more tightly bonded to nucleus. And hence, loosing an electron will require high energy. Thus, the chemical reactivity decreases.
- Alkali metals are the elements which belong to group 1 of the periodic table. The general electronic configuration of these metals is
These metals will loose 1 electron to form +1 ions.
- Alkaline earth metals are the elements which belong to group 2 of the periodic table. The general electronic configuration of these metals is
These metals will loose 2 electrons to form +2 ions.
Hence, the correct answer is Option A.
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Carbon disulfide is prepared industrially by reacting carbon with sulfur dioxide according to the above equation. If 70.8 g of carbon react, how many moles of CS2 are produced? Show all work, include all units, and box your answer.
How many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?
B. product
Answers
Think about it like this: a company produces products, not coefficients.
(Relative atomic mass: S=32,0=16)
(A) 0.56 g
B) 5.6 g
(C) 56 g
C) 560g
Answers
The mass of oxygen gas contains the same number of moles as 56g of sulphur is 56g
Calculation,
Number of moles of sulphur = given mass/ molar mass of sulphur
Number of moles of sulphur = 56/ 32 moles
Number of moles of sulphur = 1.75 moles
According to question,
Number of moles of sulphur = Number of moles of oxygen(O2)
So, Let mass of oxygen be X.
Number of moles of oxygen = X/16×2 = 1.75 moles
Mass of oxygen (X) = 1.75×16×2 grams
Mass of oxygen (X) = 56 grams
What is moles ?
The 6.022×1023 of chemical species like an electrons, molecules atoms, ions etc is called moles
To learn more about moles here.
#SPJ3
Answer:
C. 56 g
Explanation:
56 g S (1 mol S/ 32 g) = 1.75 mol S
1.75 mol O2 (32 g/ 1 mol O) = 56 g O2
volcanoes erupting
underwater earthquakes
O greenhouse gases forming
evaporation from lakes and rivers
Answers
Answer:
Option D:
evaporation from lakes and rivers
Explanation:
The water cycle is a natural cycle that shows how water moves and circulates within a natural environment. Water usually moves between the hydrosphere and the atmosphere through evaporation and condensation.
When water evaporates from the hydrosphere (the water bodies), it goes up into the atmosphere where it cools to become clouds. As more water evaporates, the clouds formed increase in mass. Once the clouds are too heavy to be held up in the sky, they fall down as precipitation (rain, snow, hail) into the water bodies and surrounding land below.
acceptor
(B) acceptor
(C) donor
(D) donor
Answers
30 miles
B.
60 miles
C.
120 miles
D.
150 miles
i need help and please answer
Answers
b. False
Answers
the answer is false cause i tried true first and got it wrong.
Answer:
False
Explanation:
Not all solids have an orderly internal structure, although some do which are called crystalline solids. Some examples are metals and table salt. Solids without a orderly internal structure are called amorphous solids. Examples of this are glass, plastics, and rubber.