“Moving on, let's review the differences between ionic and covalent bonds.”

English Lesson: Moving on, let's review the differences between ionic and covalent bonds.

You're a chemistry teacher. You're giving a lecture to your class. You've finished one topic and now you want to start talking about the next topic.

Moving on, let's review the differences between ionic and covalent bonds.

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let's (do something)

Make a suggestion using "let's ___" when you're pretty sure that the people you're speaking to will accept your suggestion. If you're not as sure, you can say "why don't we ___":

Guys, why don't we call it a day.

Moving on, (sentence)

Use the phrase "Moving on" to transition from one topic to another in formal situations like when you're leading a meeting, interviewing someone, teaching a class, etc.

You use it at the beginning of a sentence like this:

Moving on, let's discuss the budget cuts.

ionic and covalent bonds

This is a concept from the study of chemistry. Atoms can be bonded (meaning stuck together) to each other in two different ways:

  • A covalent bond happens when atoms share electrons between them.
  • An ionic bond happens when one atom removes electrons from another atom, and they are attracted to each other as a result.

If you'd like to understand ionic and covalent bonds better, you can watch this video lesson:

https://www.khanacademy.org/science/chemistry/periodic-table-trends-bonding/v/ionic--covalent--and-metallic-bonds

This topic doesn't come up in conversation much outside of science classes.

differences between (something) and (something)

When two things are different in several ways, you can talk about "the differences between ___ and ___".

Do you see any differences between the one on the left and the one on the right?

When two things are different but mostly in one particular way, you use the singular form: "the difference between ___ and ___".

What's the difference between the twenty-dollar model and the thirty-dollar one?