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Verizon [17]
3 years ago
13

What do all elements in the same period of the periodic table have in common

Chemistry
2 answers:
Delvig [45]3 years ago
8 0

In the periodic table of elements, you can found all the elements grouped according to common characteristics.

You have three mine things: lines, columns, and blocks.

Blocks define the sequence in which the electron layers of the elements are filled.

Columns are called groups. The elements of a group have similar electronic configurations and the same amount of electrons on the last layer.

Lines are called periods. Those periods define the number of energy levels of each element.

Flauer [41]3 years ago
4 0
Atomic orbitals!!!!!!!!!!

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What type of climate conditions are needed to form coal deposits.
guajiro [1.7K]

Answer:

Subbituminous coal can form at temperatures as low as 35 to 80 °C (95 to 176 °F) while anthracite requires a temperature of at least 180 to 245 °C (356 to 473 °F).

Sub-types: Cannel coal

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Explanation:

6 0
3 years ago
Question 25 of 25
mrs_skeptik [129]

Answer:

D. 37 reports

Explanation:

Last month, he wrote 9 reports, and this month he wrote 28 reports. To find how many he wrote over the past two months, add his reports from last month and this month.

last month + this month

9 reports +28 reports

37 reports

So, he wrote 37 reports, or choice D

5 0
3 years ago
How many moles are in 23.8 g of sulfur dioxide
Yuki888 [10]

Answer:

0.371

Explanation:

number of moles = mass / Ar

= 23.8g / 32.1 + (16.0 × 2)

= 0.37129485179 = 0.371 (3 s.f).

hope it helps :)

4 0
2 years ago
Manganese metal can be obtained by the reaction of manganese dioxide with aluminium. 4Al(s) + 3MnOz(s) → 2 Al2O3(s) + 3 Mn(s) Ca
Snezhnost [94]

Answer : The enthalpy change of reaction is -1800 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

4Al(s)+3MnO_2(s)\rightarrow 2Al_2O_3(s)+3Mn(s)    \Delta H=?

The intermediate balanced chemical reaction will be,

(1) 2Al(s)+\frac{3}{2}O_2(g)\rightarrow Al_2O_3(s)    \Delta H_1=-1680kJ/mole

(2) Mn(s)+O_2(g)\rightarrow MnO_2(s)    \Delta H_2=-520kJ/mole

First we will multiply reaction 1  by 2 and reverse reaction of reaction 2 by 3 then adding both the equation, we get :

The expression for final enthalpy is,

\Delta H=[n\times \Delta H_1]+[n\times (-\Delta H_2)]

where,

n = number of moles

\Delta H=[2mole\times (-1680kJ/mole)]+[3\times -(-520kJ/mole)]

\Delta H=-1800kJ

Therefore, the enthalpy change of reaction is -1800 kJ

8 0
3 years ago
Sarah measures out 151 grams of SO2. How many miles is this? Express your answer to three significant figures
elena-s [515]

150 g SO₂ = 2.36 mol SO₂

M_r = 32.06 + 2×16.00 = 32.07 + 32.00 = 64.06

Moles of SO₂ = 151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂

6 0
3 years ago
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