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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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AVprozaik [17]
Because of the difference in the # of mollecules

4 0
3 years ago
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calculate the concentration in parts per million (ppm) of DDT if a sample size of 2000 g contained 0.050 g DDT
Firlakuza [10]

Answer:

= 25 ppm

Explanation:

  • PPM also refers to parts per million, it represents a low concentration of a solution. It represents 0.001 gram or a milligram in a 1000 mL, which equivalent to 1 mg per liter.

Given; a sample size of 2000 g contained 0.050 g DDT

It means, 2000 mL sample contained 50 mg DDT

Therefore in ppm we get;

= 50 mg/ 2 L

= 25 mg/L

<u>= 25 ppm</u>

4 0
3 years ago
What are the differences between molecular and ionic crystals? Give an example of each.
quester [9]

Explanation:

Ionic crystals

1. They are formed by electrostatic attraction between the cation and anion.

2. Naturally solid and brittle in nature.

3.Generally good conductors of electricity in moltane state and  have high melting and boiling points.

Example: NH4Cl is an inonic compound with NH4^+ being cation and Cl- being anion.

Molecular Solid

1. These are formed by sharing of electrons pair between the atoms. A shared pair of e- is  called a covalent bond.

2. Usually not a good conductor of electricity even in melted state.

3. They mostly liquids and gases only a few are solids.

examples , CO, CO2 , H2CO3 , etc.

5 0
3 years ago
Use the following reaction: C4H9OH NaBr H2SO4 C4H9Br NaHSO4 H2O If 15.0 g of C4H9OH react with 22.4 g of NaBr and 32.7 g of H2SO
ohaa [14]

Answer:

Percent yield = 61.58%

Explanation:

C4H9OH + NaBr + H2SO4 --> C4H9Br + NaHSO4 + H2O

From the reaction;

1  mol of C4H9OH reacts with 1 mol of NaBr and 1 mol of H2SO4 to form 1 mol of  C4H9Br

We have to obtain the limiting reagent. We do this by calculatig the mols of each reactant in the reaction;

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NaBr; 22.4 / 102.89 = 0.2177

H2SO4; 32.7 / 98 = 0.3336

In this case, the limiting reagent is C4H9OH, it determines the amount of product formed.

From the stoichometry of the reaction; one mole of C4H9OH forms one mole of C4H9Br. This means 0.2027 mol of C4H9Br was formed.

Mass = Number of moles * Molar mass

Mass of C4H9Br formed = 0.2027 * 137

Mass = 27.77g

Percent yield =  (Practical yield /  theoretical yeield ) * 100%

Percent Yield = 17.1 / 27.77 * 100

Percent yield = 61.58%

8 0
3 years ago
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Hope this helped
5 0
3 years ago
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