Aqueous solutions of this ion give a reddish precipitate when excess hydroxide ion is added.(A) Cu^{2+}
(B) CO₃^{2−}
(C) Fe^{3+}
(D) Al^{3+}
(E) Pb^{2+}

Answers

Answer 1

Answer: Fe ^3+ is the correct answer

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Find the pH of the following solution. 1.2 L of a solution containing 5.0x10^-4 grams of hydrobromic acid.

Answers

The HBr is a strong acid, that is, it is fully consumed in the reaction

molar mass HBr = 80.91 g/mol

number of moles = 5.0 x 10⁻⁴ / 80.91 = 6.17 x 10⁻⁶ moles

molarity = 6.17 x 10⁻⁶ / 1.2 = 5.14 x 10⁻⁶ M

HBr ------------------- H₃O⁺ +   Br ⁻
↓   ↓   ↓
  5.14 x 10⁻⁶ 0   0
- 5.14 x 10⁻⁶   5.14 x 10⁻⁶   5.14 x 10⁻⁶
_____________________________________
0   5.14 x 10⁻⁶ M   5.14 x 10⁻⁶ M

PH = - log [ H₃O⁺ ]

PH = - log [ 5.14 x 10⁻⁶ ]

PH = 5.82

How many grams of copper, CU are there in 2.55mol of CU?

Answers

2.55 mol Cu* 63.54 g Cu / 1 mol Cu so you cancel mol Cu, leaving you with 2.55 * 63.54 g Cu /1 =162.027

Final answer:

To calculate the number of grams of copper (Cu) in 2.55 mol of Cu, multiply the number of moles by the molar mass of copper. The molar mass of Cu is 63.55 g/mol. Therefore, there are 162.05 grams of copper (Cu) in 2.55 mol of Cu.

Explanation:

To calculate the number of grams of copper (Cu) in 2.55 mol of Cu, we need to use the molar mass of copper. The molar mass of Cu is 63.55 g/mol. Therefore, 2.55 mol of Cu is equal to:

2.55 mol Cu × 63.55 g/mol = 162.05 g Cu

So, there are 162.05 grams of copper (Cu) in 2.55 mol of Cu.

Learn more about grams of copper in mol of Cu here:

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Consider four elements from Group 7A: fluorine in the second period, chlorine in the third period, bromine in the fourth period, and iodine in the fifth period. Which element has the largest first ionization energy?

Answers

Out of the possible answers for this question, fluorine in the second period is correct. Of the four elements fluorine, chlorine, bromine and iodine, fluorine has the largest first ionization energy, with a Enthalpy number of 1681.0. Of all the elements, helium has the highest first ionization energy figure.

Which event would be impossible to explain by using John Dalton’s model of the atom?

Answers

Answer:

It’s A

Explanation:

What is the ratio of sodium ions to bromide ions in neutral sodium bromide?

Answers

The reaction of sodium with bromide is sodium bromide. The balanced chemical equation is Na + Br → NaBr. In the reaction, only one mole of sodium is needed to react with one mole of bromine to produce one mole of sodium bromide.

Answer:

A 1:1

Explanation:

True or False: Mechanical weathering is the breakdown or rock by changing its chemical composition.

Answers

Answer:

False

Explanation:

Mechanical weathering breaks rocks into smaller pieces without changing their composition. Ice wedging and abrasion are two important processes of mechanical weathering. Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface.

Hope this helps☺️

Answer: False

Explanation:

That’s not using mechanics

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