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Lostsunrise [7]
3 years ago
7

Hydrogen is unique among the elements because ________. 1. It is not really a member of any particular group. 2. Its electron is

not at all shielded from its nucleus. 3. It is the lightest element. 4. It is the only element to exist at room temperature as a diatomic gas. 5. It exhibits some chemical properties similar to those of groups 1A and 7A.
Chemistry
1 answer:
Mashcka [7]3 years ago
7 0

Answer:

1,2,5

Explanation:

Hydrogen can't really be classified into any group in the periodic table because it doesn't have properties that match that of any group exactly. However it exhibits a property of group 1A (formation of a univalent positive ion) and that of group 7A (formation if a univalent negative ion). It contains only one electron, hence this outermost electron is not shielded at all from the nucleus.

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0.25 L of aqueous solution contains 0.025g of HCLO4 (strong acid) what will be the Ph of the solution g
Elan Coil [88]

Answer:

The pH of the solution will be 3

Explanation:

The strength of acids is determined by their ability to dissociate into ions in aqueous solution. A strong acid is any compound capable of completely and irreversibly releasing protons or hydrogen ions, H⁺. That is, an acid is said to be strong if it is fully dissociated into hydrogen ions and anions in solution.

Being pH=- log [H⁺] or pH= - log [H₃O⁺] and being a strong acid, all the HClO₃ dissociates:

HClO₄      +    H₂O        →      H₃O⁺      +      ClO₄-  

So: [HCLO₄]= [H₃O⁺]

The molar concentration is:

molar concentration=\frac{number of moles of solute}{volume solution}

The molar mass of HClO₄ being 100 g / mole, then if 100 grams of the compound are present in 1 mole, 0.025 grams in how many moles are present?

moles of HClO_{4} =\frac{0.025 grams*1 mole}{100 grams}

moles of HClO₄= 0.00025

Then:

[HClO_{4}]=\frac{0.00025 moles}{0.25 L}

[HClO_{4}]=0.001 \frac{ moles}{ L}

Being [HCLO₄]= [H₃O⁺]:

pH= - log 0.001

pH= 3

<u><em>The pH of the solution will be 3</em></u>

<u><em></em></u>

4 0
4 years ago
Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely r
Illusion [34]

Answer:

22.5

Explanation:

all you have to do is take the number of moles of al and multiply them by sulfuric acids mole ratio as given in the equation (3), then divide by aluminums mole ratio number (2). then you will have moles of sulfuric acid.

*note: this only works if you are going moles to moles, if you are converting to anything else, this will NOT work*

if you have any questions leave them in the comments and i will try to answer them, if this helped, pls give a brainly

7 0
3 years ago
8. which change in state is associated with the heat of vaporization,
rewona [7]
The answer is 2, liquid to vapor because vaporization is the process of liquids to vapors.
8 0
3 years ago
How do you mix solids?
Monica [59]

Answer:

Liquid–solid mixing is typically done to suspend coarse free-flowing solids, or to break up lumps of fine agglomerated solids. An example of the former is the mixing granulated sugar into water; an example of the latter is the mixing of flour or powdered milk into water.

5 0
3 years ago
P4 +6Br2 --&gt; 4PBr3
grin007 [14]

Answer:

1 mole of P₄ consumed:4 moles of PBr₃ produced

Explanation:

Look at the coefficients in the balanced chemical equation to determine the ratios. For every 1 mole of P₄ consumed (P₄ has a coefficient of 1), 4 moles of PBr₃ would be produced (PBr₃ has a coefficient of 4).

6 0
3 years ago
Read 2 more answers
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