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Tatiana [17]
3 years ago
11

Please help me fast ​

Chemistry
1 answer:
Mkey [24]3 years ago
7 0

Answer:

1..) The property by the virtue of which the metals can be beaten into sheets.

<u>Malleability</u><u>.</u>

<u>2</u><u>.</u>

<u>I</u><u>.</u><u>Reaction</u><u> </u><u>of</u><u> </u><u>iron</u><u> </u><u>with</u><u> </u><u>copper</u><u> </u><u>sulphate</u><u> </u><u>solution</u>

<u>ii</u><u>.</u>

<em>Iron metal displaces copper from its compound copper sulphate and forms iron sulphate along with copper metal. This reaction is a displacement reaction.</em>

<em>Reaction</em><em>:</em>

<u>Fe(Iron)</u>+CuSO4<u>(Copper Sulphate)</u><u>-</u><u>-</u><u>-</u><u>-</u><u>-</u><u>-</u><u>-</u><u>FeSO4(Ferrous </u><u>Sulphate</u><u>)</u><u>+</u><u>Cu(Copper)</u>

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One liter of a buffer composed of 1.2 m hno2 and 0.8 m nano2 is mixed with 400 ml of 0.5 m naoh. what is the new ph? assume the
enyata [817]
Answer is: 3,4
Chemical reaction: HNO₂ + NaOH → NaNO₂ + H₂O.
c₀(HNO₂) = 1,2 M = 1,2 mol/dm³.
c₀(NaNO₂) = 0,8 M = 0,8 mol/dm³.
V₀(HNO₂) = V₀(NaNO₂)  = 1 dm³ = 1 L.
c₀(NaOH) = 0,5 M = 0,5 mol/dm³.
n₀(HNO₂)= 1,2 mol/dm³ · 1 dm³ = 1,2 mol.
n₀(NaNO₂) = 0,8 mol/dm³ · 1 dm³ = 0,8 mol.
V(NaOH) = 400 mL · 0,001 dm³/mL = 0,4 dm³.
n₀(NaOH) = c₀(NaOH) · V₀(NaOH).
n₀(NaOH) = 0,5 mol/dm³ · 0,4 dm³ = 0,2 mol.
n(HNO₂) = 1,2 mol - 0,2 mol = 1 mol.
n(NaNO₂) = 0,8 mol + 0,2 mol = 1 mol.
c(HNO₂) = 1 mol ÷ 1,4 dm³ = 0,714 mol/dm³.
c(NaNO₂) = 1 mol ÷ 1,4 dm³ = 0,714 mol/dm³.
pH = pKa + log (c(HNO₂) / c(NaNO₂)).
pH = 3,4 + log (0,714 mol/dm³ / 0,714 mol/dm³) = 3,4.
6 0
3 years ago
Read 2 more answers
Describe a single measurement that you could make that shows that a kettle is less than 100% efficient (providing evidence that
alexgriva [62]

Answer:

As you haven't explained what measurements you took before solving this problem, I will explain the general procedure to evaluate the efficiency of a kettle. I hope it helps you. I´ll send an attachement file with the full answer, since I couldn't write it here.

I assume that the material that is going to be heated in the kettle is water.

1- You have to boil water in it and take the time it takes to its boiling point (in seconds).  

2- You have to evaluate the amount of energy the water absorbed Q with the efficiency formula which I explain in the attachement file.

3- Divide Q by the time it took to bring the water to boiling so you can have the power it consumed.

4- You divide the last value you obtained by the Kettles's power rating.  

5- Multiply the last value by 100 to obtain a percentage value of efficiency.

Explanation:

Efficiency is the ration of a machine's useful work, in this case how much energy the water absorbed to get to its boiling point divided by the time it took to get to this point, and the total energy expended, in this case the kettles's power rating.

7 0
4 years ago
When a school bus is stopped on the roadway, you must always stop when
Natasha_Volkova [10]
The red sign pops up on the side of the bus.
7 0
3 years ago
Read 2 more answers
When titrating a NaF(aq) solution with HCl(aq), the equivalence point will occur at a pH value ______ .
Gelneren [198K]

At the equivalence point, the NaF completely reacts with the HCl

The correct option that gives the equivalence point when titrating NaF solution with HCl(aq), occur at a pH value is option c);

c) <u>Below 7 because it is determined by HF (aq)</u>

Reason:

The ionic equation of the reaction taking place in the titration is presented as follows;

  • NaF + HCl → HF + NaCl
  • Na⁺ (aq) + F⁻ (aq) + H⁺ (aq) + Cl⁻(aq) → HF (aq)+ Na⁺(aq) + Cl⁻(aq)

Therefore, by removing the spectator ions, we get;

  • F⁻(aq) + H⁺(aq) → HF(aq)

Therefore;

The net ionic equation is the formation of hydrofluoric acid, HF, which is a

weak acid, therefore, the pH value will be <u>below 7 because it is determined </u>

<u>by HF</u>

<u />

Learn more about equivalence point here: titration

brainly.com/question/2496608

brainly.com/question/14819792

brainly.com/question/23502649

6 0
3 years ago
When 10.8 g of Silver was reacted with Sulfur, 12.4 grams of product was produced (there was only one product). What is the empi
alexandr1967 [171]

Answer:

Ag2S

Explanation:

10.8 gm of silver, 12.4 gm of silver sulfide, so 12.4 -10.8 = 1,6 gm of sulfur

silver atomic weight is 108, sulfur atomic weight is 32  so

10.8/108;   = 0.10 mole Ag  1.6/32 = 0.05 mole sulfur

so there is a 2:1 ratio of silver to sulfur, so the compound is 2 silver 1 sulfur or Ag2S

5 0
3 years ago
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