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makvit [3.9K]
3 years ago
9

How many valence electrons do the alkali metals possess?

Chemistry
2 answers:
SCORPION-xisa [38]3 years ago
7 0

Answer:

They only have one in their valence shell

Explanation:

Afina-wow [57]3 years ago
6 0

Answer:

1

Explanation:

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In case of accidental contact with chemicals, how long should the eyes be flushed at the eyewash station
FromTheMoon [43]

Answer:

See the answer below

Explanation:

<em>The duration of flushing the eyes at the eyewash station in case of accidental contact with chemicals depends of the nature of the chemical.</em>

If the chemical is known to be a <u>non-irritant or mild-irritant</u> one, a <u>5-minute </u>washing time is recommended as the first aid. before seeking the help of a physician,

For <u>moderate to severe irritant</u> chemicals, an immediate <u>15-20 minutes</u> washing period is recommended before seeking further medical help.

For <u>corrosive and strong alkalis</u> chemicals, <u>30 and 60 minutes</u> washing are recommended respectively before seeking the attention of a physician.

However, if the nature of the chemical is unknown,<u> a minimum of 20-minutes washing is generally recommended</u> as first aid before seeking immediate medical help.

6 0
3 years ago
Which option correctly describes the enthalpy of formation?
leonid [27]

Answer: Endothermic reaction.

Explanation:  A chemical reaction in which energy is absorbed from the surrounding environment.

4 0
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A bicycle rider is applying a force of 20 N while heading south against a wind blowing from the south with a force of 5 N
Alenkasestr [34]

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the bike will go down 5 N

7 0
3 years ago
In the following reaction, how many grams of ammonia (NH3) will react with 27.8 grams of nitric oxide (NO)? 4NH3 + 6NO → 5N2 + 6
Rzqust [24]
<span>4NH</span>₃<span> + 6NO → 5N</span>₂<span> + 6H</span>₂<span>O

mol of NO  =  </span>\frac{mass of NO}{Molar Mass of NO}
 
                  =  \frac{27.8 g}{30.01 g / mol}
                   
                  =  0.93 mol

Based on the balance equation mole ratio of NH₃  :  NO  is   4 : 6
                                                                                            =  2 : 3

If mol  of NO  =  0.93 mol

then mol of NH₃ = \frac{0.93 mol  *  2}{3}
                           
                          =  0.62 mol

Mass of ammonia =  mol  ×  molar mass
          
                             =  0.62 mol   ×  17.03 g/mol
 
                             =  10.54 g

Therefore B is the best answer





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3 years ago
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When an antifreeze like salt is used, the freezing point of a solution is lowered. The amount by which it is lowered is called t
Ivan
Freezing point depression.
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