AQA GCSE Chemistry Topic 1 Verified Answers
1. What is the smallest unit of an element that can exist on its own?
Answer: Atom.
2. What is a chemical bond between two or more elements?
Answer: Compound.
3. What is a combination of two or more elements or compounds that are not chemically ...
AQA GCSE Chemistry Topic 1 Verified Answers
1. What is the smallest unit of an element that can exist on its own?
Answer: Atom.
2. What is a chemical bond between two or more elements?
Answer: Compound.
3. What is a combination of two or more elements or compounds that are not chemically bonded?
Answer: Mixture.
4. What is the sum of protons and neutrons in an atom?
Answer: Relative mass.
5. What do you use to draw the line for chromatography?
Answer: Pencil.
6. What does chromatography separate, and why?
Answer: Chromatography separates inks because dyes move at different rates.
7. Why must the solvent start below the ink in chromatography?
Answer: The solvent must start below the ink to avoid ink dissolving.
, 8. What stays at the baseline in chromatography, and why?
Answer: Insoluble dyes stay at the baseline because they do not move with the solvent.
9. Where do you measure the distance for rf values?
Answer: You measure the distance from the middle of the spot.
10. What is used to calculate rf values?
Answer: The substance distance divided by the solvent distance equals rf.
11. What is used to separate insoluble solids from liquids?
Answer: Filtration uses filter paper to separate insoluble solids from liquids.
12. What process separates soluble solids from solutions if they don't decompose?
Answer: Evaporation separates soluble solids from solutions if they don't decompose.
13. What is used to separate a salt that decomposes in solution?
Answer: Crystallization separates a salt that decomposes in solution by removing heat once salts start to
form.
14. How do you separate rock salt?
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller bestscores1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.82. You're not tied to anything after your purchase.
