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3 years ago

Which characteristic gives the most information about what kind of element

Chemistry

2 answers:

Oliga [24]3 years ago

5 0

Answer:

A. The atomic number

love history [14]3 years ago

3 0

the anwer is B.The atomic mass because atoms may be similar atomic mass ,number of electron,proton,and neutron by the presence of isotope but no two atoms have the same atomic number

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Explanation:

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2 years ago

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3 years ago

Calculate the work (kJ) done during a reaction in which the internal volume expands from 20 L to 43 L against an outside pressur

Alenkinab [10]

Answer:

$\large \boxed{\text{-10.0 kJ}}$

Explanation:

1. Calculate the work

w = - pΔV = -4.3 atm × (43 L - 20 L) = -4.3 × 23 L·atm = -98.9 L·atm

2. Convert litre-atmospheres to joules

$w = \text{-98.9 L\cdot$atm } \times \dfrac{\text{101.3 J}}{\text{1 L$\cdot$atm }} = \text{-10000 J} = \textbf{-10.0 kJ}\\\\\text{The work done is $\large \boxed{\textbf{-10.0 kJ}}$}$

The negative sign indicates that the work was done against the surroundings.

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2 years ago

Identify the Lewis acid in the following reaction: Cr3+(aq)+6H2O(aq)⇌Cr(H2O)63+(aq)

Nostrana [21]

In the reaction,
Cr3+(aq) + 6H2O -------> [Cr(H2O)6]3+(aq)
Cr3+ IS THE LEWIS ACID H2O is the Lewis base.
A Lewis acid is a compound or chemical that accepts a lone pair of electrons. In the above equation, Cr3+ is accepting the lone pair of electrons.

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3 years ago

Read 2 more answers

When are atoms considered to be stable?

Sergio [31]

Answer:

Atoms are at their most stable when their outermost energy level is either empty of electrons or filled with electrons.

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2 years ago