Grade 9 Chemistry
1. Define Atom. - Answer: An atom is the fundamental and smallest unit of a chemical element, composed of three
subatomic particles: protons, neutrons, and electrons.
2. Explain Atomic Radius. - Answer: Atomic radius refers to the average distance from the center of an atom...
- Answer: An atom is the fundamental and smallest unit of a chemical element, composed of three
subatomic particles: protons, neutrons, and electrons.
2. Explain Atomic Radius.
- Answer: Atomic radius refers to the average distance from the center of an atom's nucleus to its
electrons in the outermost orbital.
3. What is Boiling Point?
- Answer: Boiling point is the temperature at which a liquid changes to vapor, such as water boiling at
100°C under standard conditions.
4. Describe Binary Compound.
- Answer: A binary compound consists of two different chemical elements, often forming ionic bonds.
, 5. Define Chemical Change.
- Answer: Chemical change involves the irreversible rearrangement of atoms in one or more
substances, resulting in the formation of new substances with altered chemical properties. For example,
the rusting of iron is a chemical change.
6. Explain Chemical Property.
- Answer: A chemical property is a characteristic of a substance that becomes evident during chemical
reactions, involving changes in composition or identity. For instance, combustibility, which determines if
a material can catch fire and burn, is a critical chemical property.
7. What does Combustibility refer to?
- Answer: Combustibility describes the ability of a substance to ignite and burn, such as the highly
flammable nature of gasoline vapor.
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 $11.51. You're not tied to anything after your purchase.
