2 years ago

What is the definition of a community in environmental science

1 answer:

4 0

In environmental science, the community is defined as the organisms that interact with one another in a similar location.

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Which of the following best explains the trend in ionization energy across a period?

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A) It decreases because the distance between the nucleus and outermost shell increases

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2 years ago

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Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This solution is classified as

Eddi Din [679]

The answer is (3) a homogeneous mixture. The difference between homogeneous and heterogeneous mixture is the degree of the mixture being mixed. Due to the completely dissolved and the dissolving ability of KCl, we can get the answer,

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3 years ago

What is the purpose of adding phenolphthalein to your Erlenmeyer flask prior to starting a titration?

koban [17]

Answer:

a. The phenolphthalein acts as a color changing indicator to signal the endpoint of the reaction.

Explanation:

Phenolphthalein is an organic substance with chemical formula $C_{20}H_{14}O_{4}$ .

It is a substance commonly used in acid-base titrations to indicate the end point in the titration because phenolphthalein is colorless in acidic solutions but turns a purplish-pink color in basic solutions.

In this way it helps visually to notice when the final point of the titration has been reached.

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3 years ago

The atoms, molecules, or compounds present at the start of a chemical reaction that participate in the reaction.

Art [367]

For the first one the answer is B. and the second one is D.

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3 years ago

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2H2S + 3O2 → 2SO2 + 2H2O<br><br><br>1. For every 10.0 g of H2S how many moles of SO2 are formed?

Veseljchak [2.6K]

Answer:10