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djyliett [7]
2 years ago
7

Write three characteristics of mandleef's periodic table?​

Chemistry
1 answer:
Slav-nsk [51]2 years ago
6 0

Answer:

The periodic table is composed of seven horizontal rows or periods and is numbered between 1 and 7. There is a regular gradation in the properties of elements in the horizontal rows(periods) from left to right. The periodic table is composed of eight vertical columns or groups. They are numbered between 1 to 8.

Explanation:

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The volume of a sample of a gas at 273 c is 200.0 l. if the volume is decreased to 100.0 l at constant pressure, what will be th
Lyrx [107]
It will also be halved... but the relationship is with Kelvin not c.  So 273 +273 = 546 K.  half of that is 273 K, then subtract 273... you get 0 degrees c
7 0
3 years ago
Suppose you were to make a ring from a single strand of gold atoms. How many gold atoms would be required to make such a ring? H
Rudiy27
Let us assume that the ring is a size 7 ring, which has a circumference of 54.3 millimeters. Converting this to centimeters, the circumference of the ring is:

54.3 mm = 5.43 cm

Now, we determine the number of gold atoms that will be present in this:

5.43 / 1 x 10⁻⁹

There will be 5.43 x 10⁹ atoms


We now determine the number of moles this is by:

one mole = 6.02 x 10²³ atoms

Moles = 5.43 x 10⁹ / 6.02 x 10²³ 
Moles = 9.01 x 10⁻¹⁵ moles

The molar mass of gold is 197 g/mol

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The mass of the strand is 1.76 x 10⁻¹² grams
8 0
3 years ago
Read 2 more answers
During a physical change water can change it's (blank) but it will not change it's (blank).
Valentin [98]
Water can change it's STATE but it will not change it's COMPOUND.
8 0
3 years ago
How would one convert 15 seconds to hours?
laiz [17]

Explanation:

a ...15 seconds×(3600 seconds hour)

8 0
2 years ago
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Copper, a metal known since ancient times, exists in two stable isotopic forms, 6329Cu (69.09%) and 6529Cu (30.91%). Their atomi
Svetradugi [14.3K]

Answer:

Wt. Avg. Atomic Weight => 63.35457 amu

Explanation:

Given              Isotopic             %Abundance     fractional          Wt Avg

                  At. Mass (amu)                                  abundance      contribution                    

Cu-63              62.93                      69.09              0.6909            43.4783

Cu-65              64.9278                  20.0668        0.200668        20.0668

Wt Average of all isotopes = ∑Wt Avg Contributions

=  43.4783 amu + 20.0668 amu = 63.35457 amu

7 0
3 years ago
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