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olasank [31]
4 years ago
14

An elementary classroom models a volcanic eruption by mixing vinegar and baking soda. Which of the following observations is not

evidence of a chemical reaction?
Select one:

Gas bubbles formed after the vinegar and baking soda are combined.

After the substances are combined, a salt and water were formed.

The mass of the combined substances is greater then the masses of the substances separately.

The temperature of the combined vinegar and baking soda is less than the substances separately.
Chemistry
1 answer:
kvv77 [185]4 years ago
7 0
C is not an example.

explanation: Mass is a physical property as the law of conservation of mass states mass is neither created nor destroyed in a chemical reaction or physical transformation. Chemical reactions are a change in the molecular structure of the product.
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Answer:

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Explanation:

The number of moles of solute is equal to product of the molar concentration (molarity) and the volume (in liters) of solution.

Since the volumes and the molar concentrations of the<em> NaOH </em>and <em>HCl </em>solutions mixed are equal, each one of them contributes the same number of moles of solute.

Since every mol of NaOH produces one mol of OH⁻ ions and every mol of HCl produces one mol of H⁺ ion, the number of moles of OH ⁻ and H⁺ in solution are equal.

Thus, OH⁻ and H⁺ ions will be neutralized by the reaction:

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Which is strongly shifted to the right and has <em>neutral pH</em>.

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6 0
4 years ago
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erastovalidia [21]
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3 0
4 years ago
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8 0
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Calculate the volume of dry co2 produced at body temperature (37 ∘c) and 0.970 atm when 25.5 g of glucose is consumed in this re
katrin2010 [14]

I believe the balanced chemical equation is:

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Using PV = nRT from the ideal gas law:

<span>V = nRT  / P</span>

V = 0.8493 mol * 0.08205746 L atm / mol K * (37 + 273.15 K) / 0.970 atm

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3 years ago
If two substances travel up the chromatography paper this implies that
Colt1911 [192]

Answer:

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Explanation:

6 0
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