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marusya05 [52]
3 years ago
14

How much elements are in the periodic table?

Chemistry
1 answer:
Marina CMI [18]3 years ago
8 0
Ans 118

There are 118 known elements on the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002.
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Where is the oldest rock layer in the dome?
xeze [42]

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the oldest rocks are in the center of the dome structure.

Explanation:

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why is a graduated cylinder most appropriate for measuring the volume of a liquid instead of a beaker ?
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Graduated cylinders are designed for accurate measurements of liquids with a much smaller error than beakers. They are thinner than a beaker, have many more graduation marks, and are designed to be within 0.5-1% error. ... Therefore, this more precise relative of the beaker is just as critical to almost every laboratory.

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Successive ionization energy for Cu²+​
kogti [31]

Answer:

Here's what I get  

Explanation:

The ionization energy (I) is the energy required to remove an electron from an atom in the gaseous phase.

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Thus, the removal of two electrons from Cu gives you Cu²⁺.

I found the ionization energies of Cu and used them to create those of Cu²⁺ (see table and graph below).

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Cu²⁺: 1s² 2s²2p⁶ 3s²3p⁶ 3d⁹

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8 0
3 years ago
Determine if each salt will form a solution that is acidic, basic, or ph-neutral.
sveticcg [70]
Aluminium nitrate is acidic as its made by a weak base with a relatively stronger acid.

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8 0
4 years ago
A compound consisting of b, n, and h undergoes elemental analysis. the % composition by mass is found to be 40.28% b, 52.20% n,
svp [43]
To compute for the empirical formula, assume there is 100 grams of the compound. That means there is 40.28 g B, 52.2 g N and 7.53 g H. Convert the mass into moles using their molar masses:

40.28 g B * 1 mol/10.811 g = 3.725835 mol B
52.2 g N * 1 mol/14 g = 3.72857 mol N
7.53 g H * 1 mol/1 g = 7.53 mol H

Divide all the moles by the smallest amount which is 3.725835 mol.

B: 3.725835/3.725835 = 1
N: 3.72857/3.725835 = 1
H: 7.53/3.725835 = 2

Therefore, the empirical formula is BNH₂.
8 0
4 years ago
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