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kotykmax [81]
3 years ago
9

Balance this half-reaction: Re → ReO2 (acidic solution)

Chemistry
1 answer:
tresset_1 [31]3 years ago
7 0
This redox reaction occurs in acidic solution, meaning that we need to add H+ and H2O to help balance it out (for comparison, balancing in basic solution would involve OH- and H2O instead).

Notice that the right side of the half reaction already has oxygen added to it, so we need to add the water to the other side. This way, the left side of the reaction would get enough oxygen to match the right side. Add enough water to the left to match the number of oxygens on the right.

2H2O + Re — ReO2

We now have two oxygens on each side, but the left has four more hydrogens than the right. Fix this by adding 4H+ to the right side of the equation.

2H2O + Re — ReO2 + 4H+

The number of each element matches the number of each on the other side; the only thing left is to balance the charges. The left side of the equation has a charge of 0, but the right has a charge of +4. We can fix this by adding four electrons to the right to cancel out the +4 charge.


2H2O + Re — ReO2 + 4H+ + 4e-

That’s the balanced equation.
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pickupchik [31]

Explanation:

from the equation 1 mole of O2 will give 2 moles of H2O then 6.0 moles of O2 will give x

6.0*2 moles/ 1 mole

= 12 moles

this implies that, 6.0 moles of O2 will give = 12 moles of water

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3 years ago
#1: Which of the following is the abbreviation for a unit of energy? A. K / B. °C/ C. W / D. cal............... #2: A 200 g bloc
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Among the choices, the unit of energy is calories. Answer in 1) is D. In 2) we are given with te mass , heat and temperature change. we just need to get the heat capacity and compare it with the following metals. The calculated heat capacity is 0.46 kJ/kg K. The answer is A. iron. In 3) we can compute the heat absorbed by the formula ΔH=mCpΔT. Cp of water is 4.18 J/g K. Answer of 3) is D. In 4) the formula used in Cp=ΔH/mΔT. Answer in 4) is A. The heat of enthalpy of fusion of ice is 80 cal/g. We convert this to J/g. Answer  in 5) is B.334 J/g.
8 0
3 years ago
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jolli1 [7]

Answer:

B. first level consumers.

Explanation:

The first level consumers are also the primary consumers. They are the animals that depends or rely on plants to transform chemical energy into carbohydrates and sugar.

Primary consumers are mostly herbivores. They feed on plant matter by which they derive their nutrition. They have special enzymes that helps to convert plant materials into substances needed for their body.

So, the first level consumer takes plant matter and convert them into useful food materials for their own nutrition.

The second level consumers depend on the first level consumers for nutrition.

3 0
3 years ago
When a nonmetal oxide reacts with water, it forms an oxoacid with the same oxidation number as the nonmetal. Give the name and f
vaieri [72.5K]

Addition of chlorine to water gives both hydrochloric acid (HCl) and hypochlorous acid (HClO)

What are Transition metal oxides ?

Transition metal oxides (TMOs) are another class of nanomaterials, frequently used as anode in alkaline batteries due to their distinctive properties such as abundant active sites, short diffusion pathways, low preparation cost, high theoretical capacity and distinct reaction mechanism.

Cl2 + H2O ⇌ HClO + HCl

Cl2 + 4 OH− ⇌ 2 ClO− + 2 H2O + 2 e−

Cl2 + 2 e− ⇌ 2 Cl−

The acid can also be prepared by dissolving dichlorine monoxide in water; under standard aqueous conditions, anhydrous hypochlorous acid is currently impossible to prepare due to the readily reversible equilibrium between it and its anhydride.

2 HClO ⇌ Cl2O + H2O      K (at 0 °C) = 3.55×10−3 dm3 mol−1

The presence of light or transition metal oxides of copper, nickel, or cobalt accelerates the exothermic decomposition into hydrochloric acid and oxygen

2 Cl2 + 2 H2O → 4 HCl + O2

To learn more about exothermic decomposition click on the link below:

brainly.com/question/20089404

#SPJ4

5 0
1 year ago
Difference between clinical and laboratory thermometer
Setler79 [48]

Answer:

1)clinical thermometer has temperature range 35 to 42degree celcius where labouratery thermometer has -10 to 110 degree celcius.

2)clinical thermometer is used to measure body temperature whare labouratory thermometer is not used to measure body temperature

7 0
3 years ago
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