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Chemistry

Which of the following is the best indication that a chemical change has taken place?

a. The matter changes color.

b. A mixture separates into layers.

c. The change is reversible.

d. The shape of the substance changes.

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Chemistry

This is not lost in a chemical Reaction

(4 letter word second letter is A)

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Chemistry

Which type of soil holds the least water

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Chemistry

Eq-43 which type of fire extinguisher should be onboard a vessel with a permanently installed fuel tank

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Chemistry

5. Identify a suitable method that would be used to separate mixture of the follow

[b]Water and ethanol

c]Table salt dissolved in water

d] iodine and potassium

Pul the table below

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Chemistry

How much energy is needed to convert 57.3 grams of ice at 0.00°c to water at 75.0°c? specific heat (ice) = 2.10 j/g°c specific heat (water) = 4.18 j/g°c heat of fusion = 333 j/g heat of vaporization = 2258 j/g?

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Chemistry

A certain first-order reaction (A→productsA→products) has a rate constant of 9.90*10-3 s-1s-1 at 45 ∘C∘C. How many minutes does it take for the concentration of the reactant, [A][A], to drop to 6.25%% of the original concentration? Express your answer with the appropriate units

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Chemistry

Assign the oxidation number for (NH4) 3PO4

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Kimberly Schroeder

Chemistry

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?

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Chemistry

Do pure substances have the same chemical and physical properties

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Chemistry

How is matter conserved in a chemical reaction

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Rishi Fitzgerald

Chemistry

Define Percent transmittance

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Gracelyn Marquez

Chemistry

Express (3 x 104) (4 x 1023) in scientific notation

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Chemistry

The theoretical yield of aspirin in a reaction is 721 g. What is the percent yield

if 461 g is produced?

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Chemistry

Nonmetal oxides can react with water to form acids. For example, carbon dioxide reacts with water to form carbonic acid: CO2 H2O H2CO3. (1) Write an equation to show how diiodine pentaoxide reacts with water to form an acid. Do not include states. Balanced equation for reaction (smallest integer coefficients) : (2) What is the name of the acid (include 'acid') :

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