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Ch 2: Characteristics & Chemicals of Life: Help and Review

About This Chapter

The Characteristics and Chemicals of Life chapter of this Middle School Life Science Help and Review course is the simplest way to master the characteristics and chemicals of life. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of the characteristics and chemicals of life.

Who's it for?

Anyone who needs help understanding middle school life science material will benefit from taking this course. You will be able to grasp the subject matter faster, retain critical knowledge longer and earn better grades. You're in the right place if you:

  • Have fallen behind in understanding the atom or the characteristics and chemicals of life.
  • Need an efficient way to learn about the characteristics and chemicals of life.
  • Learn best with engaging auditory and visual tools.
  • Struggle with learning disabilities or learning differences, including autism and ADHD.
  • Experience difficulty understanding your teachers.
  • Missed class time and need to catch up.
  • Can't access extra science learning resources at school.

How it works:

  • Start at the beginning, or identify the topics that you need help with.
  • Watch and learn from fun videos, reviewing as needed.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Submit questions to one of our instructors for personalized support if you need extra help.
  • Verify you're ready by completing the Characteristics and Chemicals of Life chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the Characteristics and Chemicals of Life chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any relevant question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

In this chapter, you'll learn the answers to questions including:

  • What are the different states of matter?
  • How are the atom and the electron shell constructed?
  • How do atomic and mass numbers differ?
  • What are elements, and how do they relate to compounds and elements?
  • What are isotopes and their relationship to average atomic mass?
  • How does the periodic table work?

21 Lessons in Chapter 2: Characteristics & Chemicals of Life: Help and Review
Matter: Physical and Chemical Properties

1. Matter: Physical and Chemical Properties

How are substances identified? There are two major ways we can describe a substance: physical properties and chemical properties. Learn about how chemists use properties to classify matter as either a mixture or a pure substance.

States of Matter: Solids, Liquids, Gases, & Plasma

2. States of Matter: Solids, Liquids, Gases, & Plasma

Learn the four states of matter in the universe: solid, liquid, gas and plasma. Learn about the differences in shape and volume among the four states, which of the states is the most common and why plasma conducts electricity.

The Atom

3. The Atom

Tune into this lesson to find out what matters about matter. What exactly is an atom? And, how do the atoms that make up the elements in the periodic table differ from one another?

The Electron Shell

4. The Electron Shell

You may be familiar with the role of electrons in electrical devices, but did you know that electrons also determine the chemical reactivity of everything around you?

Atomic Number and Mass Number

5. Atomic Number and Mass Number

Atoms are the basic building blocks of everything around you. In order to really understand how atoms combine to form molecules, it's necessary to be familiar with their structure. In this lesson, we'll dissect atoms so we can see just what really goes into those little building blocks of matter.

What Are Elements?

6. What Are Elements?

Look around you. What do you see? Elements are everywhere. They are the building blocks of all matter on Earth. In this lesson, we will discuss what an element is, how elements are written as symbols, and how elements are the building blocks of all matter.

Isotopes and Average Atomic Mass

7. Isotopes and Average Atomic Mass

When you drink a glass of water, you are actually drinking a combination of heavy water and light water. What's the difference? Is it harmful? This video will explain the difference between the two types of water and go into detail on the significance of the different isotopes of elements.

The Periodic Table: Properties of Groups and Periods

8. The Periodic Table: Properties of Groups and Periods

How is the periodic table like the map you used on your last road trip? In this lesson, you will be introduced to the periodic table, the road map of chemists. We will discuss how the elements are organized and how you can use this organization to identify some of their major physical properties.

Understanding the Relationships between Elements, Molecules & Compounds

9. Understanding the Relationships between Elements, Molecules & Compounds

Everything on Earth is made of atoms, and sometimes they combine to form new groups of atoms. The sky is the limit when it comes to these combinations, which account for the vast number of things we find in our natural world.

What is Allolactose?

10. What is Allolactose?

What are sugars made from? How are they used within the body? This lesson addresses those questions through an investigation into the structure and function of allolactose.

What is an Allosteric Site of the Enzyme? - Definition & Biology

11. What is an Allosteric Site of the Enzyme? - Definition & Biology

In this lesson we'll review what enzymes are and how they work. Then we'll learn what the allosteric site is on an enzyme and how they influence enzyme activity. We will also go over some examples of allosteric regulation in the body.

Allozyme: Definition & Electrophoresis

12. Allozyme: Definition & Electrophoresis

In this lesson, we will discuss how scientists differentiate between several species that look very similar. We will focus on allozymes, which scientists use as a marker of species relatedness.

What is an Isozyme? - Definition & Electrophoresis

13. What is an Isozyme? - Definition & Electrophoresis

Sometimes enzymes come in multiple forms called isozymes. This lesson will discuss the characteristics of isozymes and describe how these variations can be isolated from cells and separated from each other.

Alpha Helix Protein: Structure & Definition

14. Alpha Helix Protein: Structure & Definition

Chains of amino acids often fold into spirals called alpha helices. In this lesson, we will discuss the structure and importance of an alpha helix, why we see so many alpha helices, and what happens when alpha helices fold incorrectly.

What is Amino Acid Residue?

15. What is Amino Acid Residue?

Amino acid residue is the part of an amino acid that makes it unique from all the others. It's features, such as how it interacts with water, help guide the structure of a finished protein.

Amino Acid Sequence: Definition & Example

16. Amino Acid Sequence: Definition & Example

What are amino acids, let alone an amino acid sequence? This lesson will answer those questions and explain the structure, importance, and role in protein synthesis.

Salivary Amylase: Structure & Chemistry

17. Salivary Amylase: Structure & Chemistry

How does saliva help break down food? It contains a special enzyme called salivary amylase that does the job. This lesson explores the structure and overall function of this very useful enzyme.

What is Amylase? - Definition & Function

18. What is Amylase? - Definition & Function

Have you ever wondered why your body can digest food so rapidly? One of the reasons is a specialized protein called amylase, which you can read more about in this lesson.

Bioluminescence: Definition & Types

19. Bioluminescence: Definition & Types

Bioluminescence is an amazing phenomenon where a chemical reaction within a living organism causes it to produce and emit light. Read this lesson to learn how this happens and where you can go to see it for yourself!

Bioluminescence in Plants, Fungi & Bacteria

20. Bioluminescence in Plants, Fungi & Bacteria

Organisms that produce light - like fireflies - are capable of bioluminescence. This lesson will explain the process and take a look at specific examples of bioluminescence in plants, fungi, and bacteria.

Bioluminescence in Fish, Insects & Cats

21. Bioluminescence in Fish, Insects & Cats

Bioluminescence is one of the many wonders of our world. In this lesson you will learn more about bioluminescence, why it occurs, and how science has used it to study disease and create fashionable pets.

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