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Svetradugi [14.3K]
3 years ago
13

Of the metal ions tested, sodium produces the brightest and most persistent color in the flame. Do you think potassium could be

detected visually in the presence of sodium by burning this mixture in a flame
Chemistry
1 answer:
elena55 [62]3 years ago
7 0

Answer:

Yes, you can detect the difference visually.

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All elements in the halogen group have?
Sholpan [36]
Flourine
Chlorine
Bromine
Iodine
Astatine
8 0
3 years ago
When a 18.0 mL sample of a 0.308 M aqueous hydrofluoric acid solution is titrated with a 0.361 M aqueous sodium hydroxide soluti
sleet_krkn [62]

Answer:

pH = 12.8

Explanation:

HF + NaOH → F⁻ + Na⁺ + H₂O

<em>1 mole of HF reacts with 1 mole of NaOH</em>

<em />

Initial moles of HF and NaOH are:

HF = 0.018L × (0.308mol / L) = 5.544x10⁻³mol HF

NaOH = 0.023L × (0.361mol / L) = 8.303x10⁻³mol NaOH

That means moles of NaOH remains after reaction are:

8.303x10⁻³mol - 5.544x10⁻³mol = <em>2.759x10⁻³moles NaOH</em>

Total volume is 18.0mL + 23.0mL = 41.0mL = 0.0410L

Molar concentration of NaOH is

2.759x10⁻³moles NaOH / 0.0410L = 0.0673M = [OH⁻]

pOH = - log [OH⁻] = 1.17

As pH = 14 - pOH

<em>pH = 12.8</em>

<em></em>

4 0
3 years ago
in the two stage cooling method what is the maximum amount of time allowed for both stages cooling food from 135 to 41 degrees F
BlackZzzverrR [31]
In the past, restaurants had four hours, straight through, to cool food to 41°F or lower. Now the FDA recommends cooling food in two stages -- from 135°F to 70°F in two hours then from 70°F to 41°F or lower in an additional four hours for a total cooling time of six hours
Explanation:
the two-stage cooling method<span> is a </span><span>Food Code </span>counselled<span> procedure for cooling food in restaurants and foodservice </span>institutions<span>. </span>within the<span> two-stage cooling </span>methodology<span>, food is</span><span> cooled from 140° F (60° C) to 70° F (21° C) </span>among 2<span> hours and to 41° F (5° C) or lower </span>among<span> four hours. Use of this cooling </span>methodology<span> ensures that food is cooled quickly and safely and has no harmful effects.</span>
3 0
3 years ago
Read 2 more answers
Please help fast please!!!
Natali [406]

Answer:

welcome to the picture

Explanation:

ok let get it ok finish

5 0
3 years ago
How do covalent bonds form?
astra-53 [7]

Answer:

Hiya there!

Explanation:

A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions. Shared electrons located in the space between the two nuclei are called bonding electrons. The bonded pair is the “glue” that holds the atoms together in molecular units.

<em><u>Hope this helped!</u></em> ^w^

Credit sourced from "sciencedirect.com"

5 0
3 years ago
Read 2 more answers
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