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3 years ago

Which of the following trends can be observed when moving down a column in the periodic table

Chemistry

1 answer:

Vlad [161]3 years ago

6 0

Explanation:

A column on the periodic table represents a period.

These are some of the variations observed across a period;

Atomic radii decreases progressively from left to right due to the progressive increase in the nuclear charge without an attendant increase in the number of electronic shells.
Ionization energy increases progressively from left to right due to decreasing atomic radii.
Electronegativity increases from left to right.
Electropositivity decreases across a period.

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A 20.0 g piece of a metal is heated and place into a calorimeter containing 250.0 g of water initially at 25.0 oC. The final tem

BartSMP [9]

Answer:

$Q_{metal} = -6799\,J$

Explanation:

By the First Law of Thermodynamics, the piece of metal and water reaches thermal equilibrium when water receives heat from the piece of metal. Then:

$Q_{metal} = - Q_{w}$

$Q_{metal} = m_{w} \cdot c_{p,w}\cdot (T_{1}-T_{2})$

$Q_{metal} = (250\,g)\cdot \left(4.184\,\frac{J}{g\cdot ^{\textdegree}C} \right)\cdot (25\,^{\textdegree}C - 31.5\,^{\textdegree}C)$

$Q_{metal} = -6799\,J$

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3 years ago

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What is the major organic product obtained from the reaction of ethylbenzene with nitronium ion, followed by benzylic oxidation?

Degger [83]

Answer:

Explanation:

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3 years ago

How many hydrogen atoms are in 709 grams of water? Answer in units of atoms.

zimovet [89]

Answer:

26 Hydrogen atoms

Explanation:

H2O

Each hydrogen atom: 2+16 = 18g

Hence,

1 atom -> 18g

x atoms -> 709g

709/18 = 39 atoms

Therefore, 39 atoms give 709g

Hence, 26 Hydrogen atoms are used

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3 years ago

In the compound nh3, nitrogen has an oxidation number of 3+ and hydrogen has an oxidation number of ______________.

Digiron [165]

In the compound nh3, nitrogen has an oxidation number of 3+ and hydrogen has an oxidation number of -1
The molecule NH3 have a neutral charge so the number of oxidation number of it's component must be equal to zero. The molecule NH composed of 1 nitrogen and 3 hydrogens. If the nitrogen oxidation number is 3+, then hydrogen would be:

1* N + 3*H=0
1*+3 +3*H=0
3H= -3
H= -1

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3 years ago

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vladimir2022 [97]

Answer: B. Allow for movement

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3 years ago