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Ivan
3 years ago
14

Water that flows from behind a large dam can cause machines to produce electricity. What change takes place? Question 6 options:

Heat energy changes into mechanical energy. Mechanical energy is used to produce electrical energy. Sound energy changes into electrical energy. Chemical energy is used to produce electrical energy.
Chemistry
2 answers:
yaroslaw [1]3 years ago
6 0
The answer is: Mechanical energy s used to produce electrical energy. I took the test hope this helps :)

Georgia [21]3 years ago
4 0
The only one that makes sense is Mechanical to electrical. Water does not make energy through its sound or heat or chemicals. Water moves through the dam to create electricity. Hope this helps!
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A voltaic cell is constructed in which the anode is a Fe|Fe2 half cell and the cathode is a Cd|Cd2 half cell. The half-cell comp
Svetradugi [14.3K]

Answer: The Anode reaction is Fe(s)\rightarrow Fe^{2+}(aq)+2e^-

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons.Oxidation occurs at anode.

Anode : Fe(s)\rightarrow Fe^{2+}(aq)+2e^-

Reduction reaction is defined as the reaction in which a substance gains electrons. Reduction occurs at cathode.

Cathode : Cd^{2+}(aq)+2e^-\rightarrow Cd(s)

3 0
3 years ago
You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 2.36. You determine that the concent
Harlamova29_29 [7]

Answer:

4.27

Explanation:

Let's consider the dissociation of a generic monoprotic acid.

HA(aq) → H⁺(aq) + A⁻(aq)

The pH is 2.36. The concentration of H⁺ is:

pH = -log [H⁺]

[H⁺] = antilog -pH

[H⁺] = antilog -2.36 = 4.37 × 10⁻³ M

We know that the concentration of the acid Ca = 0.3535 M. We can find the acid dissociation constant using the following expression.

[H⁺] = √(Ca × Ka)

Ka = [H⁺]²/Ca

Ka = (4.37 × 10⁻³)²/0.3535

Ka = 5.40 × 10⁻⁵

The pKa is:

pKa = -log Ka = -log 5.40 × 10⁻⁵ = 4.27

7 0
4 years ago
Which of the following is NOT a representative particle?<br><br> molecule<br> atom<br> electron
kodGreya [7K]
Answer: Molecule


Step-by-step-explanation
3 0
3 years ago
How many grams of solid Na2CO3 are required to neutralize exactly 2 liters of an HCI solution of pH 2.0?
Snezhnost [94]

Answer:

The answer is 1.06g.

Explanation:

Analysis of question:

1. Identify the information in the question given.

  • volume of HCl is 2 dm3
  • pH of HCl is 2.0

2. What the question want?

  • mass of Na2CO3 is ?(unknown)
  • 3. Do calculation.
  • 1st-Write a balanced chemical equation:

Na2CO3 + 2HCl (arrow) 2NaCl + H20 + CO2

  • 2nd-Determine the molarity of HCl with the value of 2.0.

pH= -log[H+]

2.0= -log[H+]

log[H+]= -2.0

[H+]= 10 to the power of negative 2(10-2)

=0.01 mol dm-3

molarity of HCl is 0.01 mol dm-3

  • 3rd-Find the number of moles of HCl

n=MV

=0.01 mol dm-3 × 2 dm3

=0.02 mol of HCl

  • 4th-Find the second mol of it.

Based on the chemical equation,

2.0 mol of HCl reacts with 1.0 mol of Na2CO3

0.02 mol of HCl reacts with 0.01 mol of Na2CO3

<u>N</u><u>a</u>2CO3>a=<u>1</u><u> </u>mol

<u>2</u><u>H</u>Cl>b=<u>2</u><u> </u>mol

  • 5th-Find the mass of it.

mass= number of mole × molar mass

g=0.01 × [2(23)+ 12+ 3(16)]

g=0.01 × 106

# =1.06 g.

3 0
4 years ago
Please show work
sasho [114]

Answer:

The pressure is 16, 9 atm

Explanation:

We use the formula PV=nRT. The temperature in Kelvis is: 273 + 25 = 298K

PV=nRT  P =(nRT)/V

P= (0, 450 mol x 0,082 l atm/K mol x 298)/0,650 l= 16, 91723077atm

3 0
4 years ago
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