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2 years ago

How can we explain patterns of behavior among chemical elements?

2 answers:

5 0

The periodic table helps us see the pattern of behavior of elements. The chemical and physical properties of elements can be estimated based on their position in the periodic table.

Oduvanchick [21]2 years ago

4 0

Patterns of behavior among chemical elements can be explained using the periodic table. In the periodic table, chemical elements are arranged according to their proton numbers,(atomic number) this organisation illustrates common recurring patterns of physical and chemical properties among the elements.

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How many block shells are the d block and the f block

HACTEHA [7]

Answer:

1s, 3p, 5d, 7f

Explanation:

4 0

2 years ago

Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common isotopes. If the abundance of 234U

LenaWriter [7]

Answer:

Average atomic mass of uranium= 237.98 amu.

Explanation:

Given data:

Abundance of U²³⁴ = 0.01%

Abundance of U²³⁵ = 0.17%

Abundance of U²³⁸ = 99.28%

Average atomic mass = ?

Solution:

Average atomic mass of uranium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) +(abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass of uranium= (234×0.01)+(235×0.71)+(238×99.28)/100

Average atomic mass of uranium= 2.34 + 166.85 + 23628.64 / 100

Average atomic mass of uranium= 23797.83 / 100

Average atomic mass of uranium= 237.98 amu.

3 0

2 years ago

The digestive system is a group of organs working together to convert food into energy and basic nutrients that are transported

IgorLugansk [536]

B.................................

6 0

2 years ago

Read 2 more answers

What is the gram-formula mass of Ca3(PO4)2 ?

Korvikt [17]

Answer:

3) 310 g/mol

Explanation:

Hello,

In this case, for calcium carbonate, we are able to compute its gram-formula mass by considering the atomic mass of each element composing it and their subscripts as shown below:

$M=3*m_{Ca}+2*m_P+4*2*m_O\\$

Thus, we compute:

$M=3*40g/mol+2*31g/mol+4*2*16g/mol\\\\M=310g/mol$

Hence answer is 3) 310 g/mol . Remember this is also known as the molar mass of the mentioned compound.

Best regards.

5 0

2 years ago

½ H₂(g) + ½ I₂(s) --> HI(g) ΔH= 26 kJ/mol

BartSMP [9]

Answer : The correct option is, (C) 31 kJ/mole

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 sublimation of iodine reaction is,

$I_2(s)\rightarrow I_2(g)$ $\Delta H=?$