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7 Questions

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Class 7 Chemistry Basics Quiz

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Questions and Answers

Which subatomic particle has a negative charge?

Proton

Positron

Electron (correct)

Neutron

What is the chemical symbol for sodium?

Na (correct)

What is the formula for calculating the density of a substance?

$mass - volume$

$mass + volume$

$\frac{mass}{volume}$ (correct)

$mass \times volume$

Which of the following is an example of a chemical change?

Burning wood Signup and view all the answers

Which of the following best describes a radical in chemistry?

A group of atoms that act as a single atom in a chemical reaction Signup and view all the answers

What is the role of acids and bases in chemical reactions?

Acids and bases catalyze chemical reactions Signup and view all the answers

What is the fundamental difference between an atom and a molecule?

An atom consists of only one type of element, while a molecule can have multiple types of elements Signup and view all the answers

Study Notes

Subatomic Particles

Electrons are the subatomic particles that have a negative charge.

Sodium

The chemical symbol for sodium is Na.

Density Calculation

Density can be calculated using the formula: Density = Mass/Volume.

Chemical Change

A chemical change involves the transformation of substances, resulting in new chemical compounds. Examples include combustion, rusting, and fermentation.

Radicals in Chemistry

A radical is an atom or molecule that has unpaired electrons, making it highly reactive and unstable.

Role of Acids and Bases

Acids donate protons (H⁺ ions) in chemical reactions, while bases accept protons. They play crucial roles in pH regulation, neutralization reactions, and various biochemical processes.

Atoms vs. Molecules

The fundamental difference between an atom and a molecule is that an atom is the smallest unit of an element, while a molecule consists of two or more atoms bonded together, representing the smallest unit of a compound.

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Description

Test your knowledge of basic chemistry concepts with this Class 7 quiz. Answer questions about subatomic particles, density calculation, chemical symbols, and identifying chemical changes.