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2 years ago

6

The electron configuration of an element is 1s22s22p63s1. Describe what most likely happens when an atom of this element comes n

ear an atom having seven valence electrons. (5 points)

1 answer:

bearhunter [10]2 years ago

5 0

Answer:

The element with electron configuration 1s² 2s² 2p⁶ will most likely not........

Explanation:

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What is the percentage by mass of copper in copper oxide (CuO)?

Viefleur [7K]

Answer:

79.89%

Explanation:

Copper has a molar mass of 63.55

Oxygen has a molar mass of 16.00

If you add these you get 79.55

To get the mass percent of copper divide copper by the whole. 63.55/79.55*100= 79.89%

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2 years ago

Why does mass decrease when sugar dissolved in water

kap26 [50]

Answer:

Because the same amount of sugar is still there. The solid sugar crystals break apart in water as the sugar dissolves, but the individual sugar particles or molecules are still present and do not change as a result of dissolving in the water. The combined mass of the sugar and water shouldn't change.

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2 years ago

Draw all of the Lewis structures of O2 which obey the octet rule and use this Lewis structure or these resonance structures to p

ryzh [129]

Answer:

Each oxygen atom is connected to the central O atom with 2 covalent bonds.

Explanation:

Oxygen atoms are connected by two covalent bonds in the oxygen molecule from the Lewis structure, we see that the bond order for O2 is 2 (a double bond) this is clearly seen in the image attached. There are no resonance structures for the oxygen molecule since there are no partial bonds in the molecule, only the two covalent bonds present.

This structure of oxygen shown in the image is its only structure, showing the covalent bonds formed and other non bonding electrons present in the molecule. The octet rule is followed in drawing the structure. Each oxygen atom possesses an octet of electrons on its outermost shell.

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2 years ago

What is the [OH-],[H3O] and PH for the following

malfutka [58]

The values for hydroxide ions, hydronium ions and pH are found in the attached picture.

Explanation:

See the attached picture.

Learn more about:

pH

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4 0

2 years ago

Pls assist if you can.<br>Reasons why hydrogen was chosen as a standard reference to other elements

MrMuchimi

Answer:

See below

Step-by-step explanation:

Hydrogen either reacts with or is formed by reactions with many other elements, so chemists could use it directly to determine their relative masses.
Hydrogen has the smallest atomic mass, so it was convenient to give H a relative atomic mass of 1 and assign those of other elements as multiples of this number.

The O = 16 scale became the standard in 1903 and carbon-12 was chosen in 1961.

4 0

2 years ago