GCSE Chemistry - Chemical Changes
GCSE·2 mins·01/11/21

GCSE Chemistry - Chemical Changes

Studying Chemical Changes GCSE? All you need to know is here!

You’ve heard of sodium chloride right? Table salt? Well a salt is the broad term for a certain chemical compound. The way we make salts is what you’ve already learnt/will learn in this chapter of the book. The whole topic is mostly on chemical equations, so let’s see what you need to know to grab all the marks!

General Equations

In this topic you learn about a few general equations to make salts, using similar reactants in each one.

  1. Acid + Metal → Salt + Hydrogen
  2. Acid + Base → Salt + Water
  3. Acid + Alkali → Salt + Water
  4. Acid + Metal Carbonate → Salt + Water + Carbon Dioxide

Commit these to memory! Learn how to identify an acid, base and alkali. Have a look at various acid-base equations and see if you can work out the formula of the salt. Look in your textbook and see if you can figure it out. Think you can do it? Nice!

Struggling? That’s okay too! You can find plenty of help on Scoodle with their incredible list of educational videos, or you can search through their list of tutors to find the best one for you!

https://scoodle.co.uk

The Reactivity Series

You don’t really need to know this by heart! If you don’t it won’t cost you too many marks. That being said, it can’t hurt to know it either 🤷‍♂️. I’d suggest having enough of an idea to be able to answer questions that come up. Typically, the reactivity expands on Displacement Reactions. So if you can answer questions on that comfortably then you should be just fine.

Lab Experiments

Extracting metals and the whole crystallisation process you need to have on lock. Read through it and make sure you know the ins and outs of the whole experiment. Oftentimes they can ask you to describe the step-by-step instructions on how to obtain metal X from a compound. This is where it comes in!

Ionic Equations

I’ll admit, these are hard 😂. It usually takes my students a good 2 lessons on average to really grasp half equations and ionic equations. As a student I struggled with this a lot too. So don’t worry if you don’t get it, you’re not the only one.

With this you really want to understand why things are happening the way they are. Why are the electrons on that side? Why are there two electrons on the left of this equation but one electron on the right of that equation? These are the kind of questions you should be able to answer. You can find a video on how to perfect ionic equations here:

https://scoodle.co.uk/video-lessons

Final Thoughts

There’s a lot of content to cover in this topic and it’s okay if you don’t get it the first time around. Go over it again, and again and again until you do get it. Then, like with the rest of Chemistry, do questions on it. You can even try explaining what you know to one of your peers to really test your knowledge and see if you can answer questions that they come up with.

Cool, that’s Chemical Changes. The next article is on Energy Changes which requires its own set of skills. See you there!

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