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Kitty [74]
3 years ago
5

so i need help on my test, i would put the link here but it does not let me so i´ll just put the link down below i need the answ

ers by 10:51 thank you plzz
Chemistry
2 answers:
a_sh-v [17]3 years ago
5 0

Answer: I don't see the link

Explanation:

dedylja [7]3 years ago
3 0

Answer:

m

Explanation:

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The melting point of aluminum is 660ºC. At what temperature will aluminum melt if you have 5 grams? 10 grams? Explain your answe
valkas [14]

Answer:

the melting point of aluminum is 660 degrees Celsius.

5 0
2 years ago
what mass of sodium fluoride (FW=42.0 g/mol) must be added to 3.50 x 10^2 mL of water to give a solution with pH = 8.40?
MaRussiya [10]

Answer:

Explanation:

Sodium fluoride, being a salt, dissolves in water completely producing F ⁻ ions. Now  F⁻ is the conjugate base of the weak acid HF, so in water we will have the following equilibrium:

F⁻  +  H₂O ⇆ HF + OH⁻

Given this equilibrium, we need to calculate Kb from the Ka for HF,  the [ OH ⁻] from the given pH, and finally the mass needed to produce that  OH⁻ concentration.  

The equilibrium constant, Kb , can be calculated from Kw = Ka x Kb, where Kw = 10⁻¹⁴ and Ka for HF is  6.6 x 10⁻⁴ from reference tables.

Kb = 10⁻¹⁴ / 6.6 x 10⁻⁴ = 1.5 x 10⁻¹¹

pH + pOH = 14  ⇒ pOH = 14 - 8.40 = 5.60

[ OH⁻ ] = 10^-5.60 = 2.51 x 10⁻⁶

Now we have all the information :

                                   F⁻                    HF                        OH⁻

Equilibrium                 X                  2.51 x 10⁻⁶            2.51 x 10⁻⁶

(2.51 x 10⁻⁶)² / X  =  1.5 x 10⁻¹¹     ⇒  X =  (2.51 x 10⁻⁶)²  / 1.5 x 10⁻¹¹

X = [ F⁻ ] = 0.41 M

For 350 mL ( 0.35 L ) we need to add:

0.41 mol HF/ 1 L  *  0.35 L = 0.144 mol

and finally the mass will be:

0.144 mol NaF *  42.0 g/mol NaF = 6.03 g NaF

7 0
2 years ago
Which of the following is a mixture
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3 years ago
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WS 3.5 more Lewis structures
vlabodo [156]
Kinda confused what worksheet your on

6 0
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In which of the following examples has a chemical reaction occurred?
katrin2010 [14]
"A" is the answer. The chemical reaction is when the batter becomes brown.

B is mixing C is mass becoming a liquid and D. is dissolving no chemical reaction happened there.

Hope that helps!
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3 years ago
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