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ipn [44]
3 years ago
12

3.

Chemistry
1 answer:
swat323 years ago
3 0

Answer:

14.7838

Explanation:

Given that;

A student uses a solution that contains 16 g of water to conduct an experiment and at the end of an hour ; the amount have decreased by 3.5%

The mathematically illustration for this is given as

= 16 g ×  3.5%

= 16 *\frac{3.5}{100}

= 0.56  

After an hour; the amount have decreased by 16 - 0.56

= 15.44

after 2 hours the water decreased by another 4.25%

i.e  15.44 * \frac{ 4.25}{100}

⇒ 0.6562

after two hours , the amount would have decreased by:

= 15.44 - 0.6562

= 14.7838

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¿Se puede disolver acido sulfurico en NaCl ?
lord [1]

Answer:

no

Explanation:

3 0
3 years ago
Why is the chemical formula magnesium sulfide written as MgS and NOT Mg2S2?
Anna71 [15]

Explanation:

The chemical formula magnesium sulfide written as MgS and NOT Mg_{2}S_{2} because charge on magnesium ion is +2 and charge on sulfide ion is -2.

Therefore, these charges will cancel out each other as we write the formula in simplest crisscross  method.

Also, the numbers in a chemical formula display the total number of atoms attached with each other or central atom.

For example, in CaCl_{2} there are two chlorine atoms attached to one calcium atom.

Therefore, MgS denotes one sulfur atom is attached to magnesium atom. Hence, we do not write the formula of magnesium sulfide as Mg_{2}S_{2} because this shows two magnesium atoms are attached to two sulfur atoms which is not true.

8 0
3 years ago
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Rank the following substances in order from most soluble in water to least soluble in water: methane, CH4; 2-butanol, C4H9OH; ma
Taya2010 [7]

Answer: The given substances are placed in order from most soluble in water to least soluble in water as follows.

         MgCl_{2} > C_{4}H_{9}OH > C_{3}H_{8} > CH_{4}

Explanation:

It is known that like dissolves like which means a polar compound will be soluble in a polar solvent. And, a non-polar compound will be soluble in non-polar solvent.

Ionic compounds are soluble in polar solvent like water. For example, MgCl_{2} is an ionic compound and it is readily soluble in water.

2-butanol (C_{4}H_{9}OH) is also a polar compound and it will also dissolve in water but to a lesser extent as compared to magnesium chloride.

Whereas both methane and propane are non-polar in nature. But as propane is larger in size as compared to methane so, it will be slightly more soluble in water as compared to methane.

Thus, we can conclude that the given substances are placed in order from most soluble in water to least soluble in water as follows.

     MgCl_{2} > C_{4}H_{9}OH > C_{3}H_{8} > CH_{4}

5 0
3 years ago
1. Explain how groups 1A-8A in the periodic table are organized by their number of valence electrons.
nirvana33 [79]

Explanation:

1. Explain how groups 1A-8A in the periodic table are organized by their number of valence electrons.

The valence electrons in an atom are the outermost shell electrons. They are the most loosely held electrons in an atom.

Coincidentally, the periodic table of elements divided into vertical groups and horizontal periods can be said to be arranged according to the number of valence electrons.

  • Atomic numbers are used to arrange elements on the periodic table.
  • Down a group, the number of electronic shell increases. More electrons are added to new energy levels.
  • As we move from left to right across a period, the number of electrons in elements increases but electronic shell is the same.
  • Down a group electronic shell increases but the number of valence electrons are the same.
  • All elements in Group 1A has just one valence electrons, Group 2A has two valence electrons.........Group 8A has eight valence electrons.
  • Moving across groups is synonymous to moving from left to right on the periodic table.
  • Due to this trend, the periodic table is arranged based on the number of valence electrons.

3. explain how you know the number of valence electrons for each group.

The number of valence electrons in a group is the group number:

   Group      Number                     valence electrons

              1A                                                 1

              2A                                                2

              3A                                                 3

              4A                                                 4

               5A                                                5

               6A                                                6

               7A                                                7

               8A                                                8

learn more:

Periodic table brainly.com/question/1971327

#learnwithBrainly

6 0
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Some plants can grow from both blank and blank
LUCKY_DIMON [66]
Plants can grow from sunlight and water.
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