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Nataliya [291]
3 years ago
6

Which of the following is an example of a chemical change? *

Chemistry
1 answer:
Norma-Jean [14]3 years ago
3 0

Answer:

hydrogen and oxygen to form water

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If the products contain 3 nitrogen atoms, then so did the reactants since overall mass is conserved in a chemical reaction.
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As the temperature of a gas increases, explain what happens to its density and why.
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What reaction conditions most effectively conver a cabocxylic acid to a methly ester?
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Answer:

Esterification reaction

Explanation:

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In this case, we need the <u>methyl ester</u>, therefore we have to choose the <u>appropriate alcohol</u>, so we have to use the <u>methanol</u> as reactive if we have to produce the methyl ester.

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3 years ago
A company is testing drinking water and wants to ensure that ca content is below 155 ppm. What is the maximum amount of Ca that
BabaBlast [244]

Answer:

138 mg

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A company is testing drinking water and wants to ensure that Ca content is below 155 ppm (= 155 mg/kg), that is, <em>155 milligrams of calcium per kilogram of drinking water</em>. We need to find the maximum amount of calcium in 890 g of drinking water.

Step 1: Convert the mass of drinking water to kilograms.

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890g \times \frac{1kg}{1000g} =0.890kg

Step 2: Calculate the maximum amount of calcium in 0.890 kg of drinking water

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