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Biology - Chemistry of Life 2 - Classwork

Last updated 5 months ago
37 questions
Section 1 - Atomic Structure and Bonds
1

What is the smallest particle into which an element can be divided and still be the same substance?

1

What part of the atom has a positive charge?

1

What part of the atom has a negative charge?

1

What part of the atom has a no charge?

1

What is found in the center of an atom

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What subatomic particles are found in the nucleus? Check all that apply

1

An electron is found...

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The main parts of an atom are?

1
In covalent bonds, atoms ______________________ electrons. While in ionic bonds, atoms ______________________ , holding them together by the attraction between charges.
Other Answer Choices:
share
give up/accept electrons
1

The octet rule tells us that most atoms are stable with 8 electrons in their outer shell.

Section 2 - pH
1

Acids are substances that produce hydrogen ions (H+) when dissolved in water. Lemon juice is an example of an acid. What does lemon juice taste like?

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What does it feel like if lemon juice gets in your eye

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Bases are substances that produce hydroxide ions (OH-) when dissolved in water. Hand soap is an example of a base. What does soap feel like?

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What does soap taste like?

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What does it feel like if soap gets in your eye?

Log in to Gizmos and sign in using my username MrsTAButler and your password (math with your initials after)

When you get to your dashboard, there will be a Gizmo called pH Analysis, use it to complete the questions below.
1

The strength of an acid or base is measured on the pH scale. The term “pH” is short for “potential of hydrogen.” It is a measure of how many excess H+ ions there are in a solution. The pH scale runs from 0 to 14, with 0 representing the highest concentration of hydrogen ions. Acidic substances have a pH below 7, while alkaline substances (bases) have a pH above 7. Pure water has a pH of 7 and is considered neutral.

The pH Analysis Gizmo allows you to find the pH of a variety of liquids. In the Gizmo, check that the Substance in the tube is Ammonia, and click Test. Wait until the animation is finished.

Indicators change color in acids or bases. What is the color of the pH paper?

1

Compare the paper to the pH color chart. What is the pH of ammonia?

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Is ammonia acidic or alkaline?

1

Get the Gizmo ready:
  • Click Reset.
Check that the 0-14 paper is selected.

Test: Use the Gizmo to find the pH of each of the available substances. Classify each substance as acidic (pH < 7), alkaline (ph > 7), or neutral (pH = 7). Fill in the chart in the show your work box.

1

Summarize: Compare all the acidic substances and all the alkaline substances.
  1. In general, what types of substances tend to be acidic?

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Summarize: Compare all the acidic substances and all the alkaline substances.

2. What types of substances tend to be alkaline?

1

Get the Gizmo ready:
  • Click Reset.
Select the 4.5-7.5 paper.

Goal: Find the pH of substances in a more accurate way.
Test: Before you begin testing with the 4.5-7.5 paper, list the pH values of the substances below that you found using the 0-14 pH indicator paper. Then find the pH of each substance with the 4.5-7.5 paper. (or take a screenshot from the other show your work box!!)

1

Analyze: Compare the pH values in each column.
  1. How do these values compare?

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What is an advantage of using the 4.5-7.5 paper?

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What is the disadvantage of using the 4.5-7.5 paper?

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Given the results from two kinds of indicator paper, which substances appear to be neutral (pH = 7)?

Section 3 - Properties of Water
1

Polar means that the water molecule is

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The oxygen has a slightly positive charge because it is bigger and pulls all the electrons toward it

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Hydrogen bonds

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Adhesion helps water molecules stick

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Cohesion helps water molecules stick

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Surface tension is the ability of water to stay stuck together because of cohesion.

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Water being a super solvent means it can

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Polar molecules and ionic compounds dissolve worse in water than non-polar molecules.

1

Ice floats because water

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Having a high specific heat means water resists changes to temperature

Section 3 - Wrap up project! (No quiz!)
Create a single-page poster in the app of your choice (Slides, Docs, Genially, Canva, etc.) explaining why Water is the best compound. You should include:

A diagram and explanation of why it has special properties (hint: it's polar!)

Explanations of each of the special properties with at least one relevant picture. Include in your explanation why the property is important to life.

Four properties to cover:
water is sticky (cohesion/adhesion)
water is a super solvent
water is less dense as ice
water has a high heat capacity



It should be, colorful, neat, organized, easy to read, and contain accurate information.
100

Drop your link below - make sure you publish/share the item, don't just share the editing link!