What are hydrates? If you're studying chemistry, you probably need to know what a hydrate is and the role it serves.

In this guide, we give a complete explanation of hydrates, including the hydrate definition, the three different types of hydrates, the rules you need to know to name hydrates and write out their formulas, and common hydrate examples you may have heard of.

The AP Calculus BC Free Response section can be intimidating if you aren't prepared. You'll need to answer six multi-part questions to show your skills in numerous calculus topics. However, when you know what to expect from this section, you'll save yourself a lot of anxiety and can create a study plan to help you get a top AP score. In this guide, we explain everything you need to know about the AP Calc BC free response section, including what the format is, when you can and can't use a calculator, what sample questions look like and how to get a top score on them, and what study tips you need to keep in mind.

Are you thinking about taking AP Environmental Science but want more information on the course before you decide to enroll? Well, you've come to the right place! AP Environmental Science (also called AP Enviro or APES) is one of the most popular AP classes—but sometimes students don't know much about it before they enroll, which can make the class difficult and not very enjoyable.

So what is AP Environmental Science? In this guide, I'll explain what topics the course covers, show you some sample test problems, and discuss who should take the class (it might not be who you're expecting). After, I'll end with some tips for success should you decide to take AP Enviro. Let's get started!

Need information on atomic radius trends? What's the trend for atomic radius? In this guide, we’ll clearly explain atomic radius trends and how they work. We’ll also discuss exceptions to the trends and how you can use this information as part of a broader understanding of chemistry.

If you’re taking chemistry, you’ll undoubtedly need to know the 7 strong acids. Read this guide to learn what the 7 strong acids are, why they’re important, and why they’re not necessarily the most dangerous acids you’ll be working with in the lab.

Looking into Enneagrams and want to know more about Enneagram Type 9? We're here to help! Read on to learn all about what Type 9s are known for, what they care about (and fear most), how to tell if you're a Type 9, the best Enneagram Type 9 careers, and how this type acts with friends, family, and when they're in love.

Enneagrams have exploded in popularity in recent years, and many people are eager to learn their Enneagram type and what it means. Once you've answered the question, "What Enneagram am I?" use this guide to learn about the 9 Enneagram types. In our Enneagram type descriptions, we go over major characteristics, as well as the top positive and negative personality traits. We also explain Enneagram wings and arrows, and how knowing your Enneagram can help you.

If you’re studying biology, you’ll likely learn about the cell theory. The cell theory is one of the most important tenets of biology, and practically everything else you learn in science class relates back to it. But what is the cell theory? In this guide, we’ll give you a clear cell theory definition, explain key dates in the history of this theory, and explain why it’s so important to understand. After reading this guide, you’ll know everything you need to know about the cell theory!

Wondering how to become a CPA or an accountant? It can be a long process, but once you know the steps to take, you can focus on completing them quickly and expertly so you can start your dream job as quickly as possible. This guide will answer the following questions:

• What do accountants and CPAs do?
• How to become a CPA/How to become an accountant
• How to become a CPA without a degree in accounting
• How long does it take to become an accountant?
• What are the accountant education requirements?

On January 19, 2021, the College Board announced that it would no longer administer SAT Subject Tests (or the SAT Essay). This is a major shift in the world of standardized testing, and it creates a lot of questions. What does it mean that the College Board is dropping SAT Subject Tests? Why did they make this decision? What should you do if you've already taken SAT Subject Tests or were planning on taking them to strengthen your college applications? Read on for the answers to all these questions and more.

Constitutional Amendments are a critical part of the US Government, but that doesn't mean they're easy to understand. They're often filled with jargon and are difficult for non-experts to understand right off the bat. Fortunately, we're here to help.

This guide gives an in-depth but clear and easy-to-understand 25th Amendment summary. Some of the key points we cover are:

• What is the 25th Amendment in simple terms?
• What does each section of the 25th Amendment mean?
• How does the 25th Amendment work?
• When was the 25th Amendment used?

January babies and the people who love them, get ready to learn about one of the oldest and diverse birthstones around: the garnet. This January birthstone has more than 20 different varieties, has been found on every continent, and has a history dating back thousands of years.

Read on to learn everything you need to know about garnets, from the rainbow of colors they come in, to what they signify, and fun facts about this gemstone.

Have you come across the terms "executive function" and "executive dysfunction" and are wondering if they describe the struggles you or a person close to you are facing? Executive dysfunction is a common issue (in fact, everyone struggles with it at some time or another), but it can be particularly severe in some people. However, the term itself is vague, and it can be difficult for people looking for more information to understand what executive dysfunction really means and how it can be treated. This guide will explain everything you need to know about executive dysfunction, including:

• Executive dysfunction and executive function definitions
• Symptoms of executive dysfunction
• Causes of executive dysfunction
• Treatment for executive dysfunction 

Wondering how to become a physical therapist? It takes years of school and training to become a physical therapist, but at the end of it, you can end up with a stable and deeply fulfilling career. You need to know the steps to take to get there though, which is where we come in. This guide will answer the following questions:

• What does a physical therapist do?
• Is it hard to become a physical therapist?
• How long does it take to become a physical therapist?
• What degree do you need to be a physical therapist?

We'll explain each of the eight steps to becoming a physical therapist, starting from high school and ending with working as a licensed PT. 

Are you learning about Enneagrams and want more information about Enneagram 8? Type 8s are often misunderstood, but this guide will tell you everything you need to know about them. Read on to learn all about what Enneagram Type 8s are known for, what they care about (and fear most), how to tell if you're a Type 8, and how this Enneagram type interacts with friends, lovers, and coworkers.