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Sergeu [11.5K]
3 years ago
15

Balance this equation and show work. BRAINLIEST Zn + O2 → Zn2+ + O2-

Chemistry
1 answer:
pantera1 [17]3 years ago
7 0
Since there are two oxygen on the left, you need two add 2 to the right oxygen
Zn + O₂ -> Zn²⁺ + 2O²⁻
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Use Hess's Law to calculate the enthalpy change for the reaction
Marysya12 [62]

Answer:

ΔH = 125.94kJ

Explanation:

It is possible to make algebraic sum of reactions to obtain ΔH of reactions (Hess's law). In the problem:

1. 2W(s) + 3O2(g) → 2WO3(s) ΔH = -1685.4 kJ

2. 2H2(g) + O2(g) → 2H2O(g) ΔH = -477.84 kJ

-1/2 (1):

WO3(s) → W(s) + 3/2O2(g) ΔH = 842.7kJ

3/2 (2):

3H2(g) + 3/2O2(g) → 3H2O(g) ΔH = -716.76kJ

The sum of  last both reactions:

WO3(s) + 3H2(g) → W(s) + 3H2O(g)

ΔH = 842.7kJ -716.76kJ

<h3>ΔH = 125.94kJ </h3>
3 0
3 years ago
Ametal used in hot water system?​
svet-max [94.6K]

Answer:

Nichrome

Answer: Hot water system coils are commonly made up of metal alloys which are a combination of two or more elements. The most commonly used metal alloy is “Nichrome”. Nichrome is an alloy of nickel (80%) and chromium (20%).

5 0
3 years ago
Why brain remembers picture better than words?​
mojhsa [17]

Answer:

your brain processes ever detail in a picture rather than words for for example a picture of something words doesn't describe it as well as the picture could.

5 0
2 years ago
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Calculate the concentration of hydrogen ions in a healthy person’s blood that has a pH of 6.40.
adoni [48]

Answer:

[H⁺] = 3.98×10⁻⁷ M

Explanation:

Given data:

pH of blood = 6.40

Hydrogen ion concentration = ?

Solution:

Formula:

pH = - log[H⁺]

by rearranging this formula,

[H⁺] =  10⁻(pH)

By putting values,

[H⁺] = 10 ⁻⁶°⁴⁰

[H⁺] = 3.98×10⁻⁷ M

4 0
3 years ago
Why is it good practice to perform a mixed melting point determination at two different ratios of unknown to known materials in
My name is Ann [436]

The melting point of a particular compound is fixed and it is an important identification of an unknown compound. The practice to determine the melting point of an unknown material In different ratio with a known material is important to get the exact melting point of the unknown material. In different ratio the melting point of the unknown material will be fixed as the melting point of a pure material doesn't depend on the ratio in which they are mixed with other material. To get the exact melting point it is always good to get the melting point twice in different ratio.  

6 0
3 years ago
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