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il63 [147K]
2 years ago
12

Each element on the periodic table has a unique set of properties: Metal vs nonmetal; number of protons; atomic mass; number of

valence electrons, type of bond it usually forms.
Use the periodic table (Periodic Table) to help you answer the following question.

Which answer below is an accurate list of properties for Bromine?

Question 28 options:

Noble Gas, 17 valence electrons, usually forms covalent bonds with other nonmetals


35 protons, 7 valence electrons, usually forms ionic bonds with group 1 or 2 metals


Metal, non-reactive full outer shell, 8 valence electrons


Nonmetal, 7 valence electrons, can make up to 7 bonds
Chemistry
1 answer:
igomit [66]2 years ago
7 0
The periodic table arranges elements in increasing
atomic number from left to right and top to bottom.
Horizontal rows on the periodic table are periods.
Elements in the same period have the same number of
electron shells.
Vertical columns on the periodic table are groups.
Elements in the same group have the same number of
valence electrons.

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A new penny has a mass of 2.49 g and a volume of 0.349cm3. The density of copper is 8.94 g/mLA)Is the penny made of pure copper?
yawa3891 [41]

Answer:

Zinc metal might be mixed with the copper.

Explanation:

Density is defined as mass of the substance present in the unit volume of the substance.

Mass=\frac{Mass}{Volume}

Density of pure copper = d = 8.94 g/mL = 8.94 g/cm^3

1 mL = 1 cm^3

Mass of the copper penny = M = 2.49 g

Volume of the copper penny = V = 0.349 cm^3

Density of the copper penny = d

d=\frac{M}{V}=\frac{2.49 g}{0.349 cm^3}=7.135 g/cm^3

Density of pure copper > Density of zinc > Density of penny

8.94 g/cm^3>7.14 g/cm^3>7.135 g/cm^3

The metal mixed with copper is zinc to make a penny . This is so because all the other metal given have higher value of density which will increase the density of the copper penny if they were present.

But here the density of the copper penny is smaller than density of pure copper which means that less denser metal than copper is also added in the penny.

3 0
3 years ago
3. How many atoms are in 85 moles H2O?​
oksano4ka [1.4K]

Answer:

5.119 *10^25

Explanation:

1 mole = 6.022 * 10^23

\frac{85 mol H20}{1} =\frac{6.022*10^2^3}{1 mol H20}

the moles cancel out so you get

85 * (6.022*10^23)

Plug that into the calculator so you get:

5.119 *10^25

8 0
3 years ago
Write a net ionic equation to show how isoquinoline, c9h7n, behaves as a base in water.
Gekata [30.6K]
There can be three definitions of a base: Arrhenius base, Lewis base or Bronsted-Lowry base. Isoquinoline acts specifically as a Bronsted-Lowry base, which is a proton acceptor. Also, it acts as an Arrhenius base because it produces OH- ions after the reaction. The net ionic equation is:

<span><em>C</em></span><em>₉</em><span><em>H</em></span><em>₇</em><span><em>N (aq) + H</em></span><em>₂</em><span><em>O ---> C</em></span><em>₉</em><span><em>H</em></span><em>₇</em><span><em>NH</em></span><em>⁺</em><span><em> (aq) + OH</em></span><em>⁻</em><span><em> (aq)</em></span>
6 0
3 years ago
If 7.50 L of water vapor at 50.2 °C and 0.121 atm reacts with excess iron, how many grams of iron(III) oxide will be produced?
spayn [35]
Where's the amount of oxygen? You need oxygen and iron to make FeO
4 0
3 years ago
How did Henry Mosley organize the periodic table?
vaieri [72.5K]

Answer:

He realized that an element is defined by its number of protons. ... When Moseley arranged the elements in the periodic table by their number of protons rather than their atomic weights, the flaws in the periodic table that had been making scientists uncomfortable for decades simply disappeared.

Explanation:

google

8 0
3 years ago
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