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KiRa [710]
3 years ago
12

Position in the periodic table.

Chemistry
1 answer:
Nikolay [14]3 years ago
4 0

Answer:

1)A period in the periodic table is a horizontal row. All elements in a row have the same number of electron shells. ... Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases both as you move down a group or across a period.

2)D)Na has one fewer valence electron than Ca.

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An organic compound (A) reacts with HCN to give (B). On hydrolysis of (B) in acidic medium gives (C). Compound (A) also produces
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Answer:

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Explanation:

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8 0
2 years ago
Any reaction that absorbs 150 kcal of energy can be classified as
Dennis_Churaev [7]
The answer should be (D) endothermic reaction.

Reason : -  Reactions in which energy is absorbed are called endothermic reactions. In your provided question, 150 kcal energy is being <u>absorbed</u>, and thus, we can say that it is an endothermic reaction. 
6 0
3 years ago
Why are Noble gases inert?
sladkih [1.3K]
Correct answer is <span>C. They have a full shell of valence electrons. </span>
3 0
3 years ago
A stone is dropped from the roof of a building; 2.00s after that, a second stone is thrown straight down with an initial speed o
Brut [27]
A) -0.5(9.8)*t^2 = -25(t-2) - 0.5(9.8)(t-2)^2 
-4.9t^2 = -25t + 50 - 4.9(t^2-4t+4) 
0 = -25t+50+19.6t - 19.6 
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t = 5.62962963 s 

b) h = -4.9(5.62962963)^2 
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c) speed 0of first stone 
= at 
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= 55.17037037 m/s 
speed of second stone
= v + at
= 25+9.8*3.62962963 
= 60.57037037 m/s
7 0
3 years ago
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