# NCERT Solutions for Class 9 Science Chapter 1 NCERT Solutions for Class 9 Science Chapter 1: The Class 9 Science chapter 1 is ‘Matter in our Surroundings’. In this chapter, students will learn about physical nature of matter, characteristics of particles of matter, states of matter, and evaporation. It is an important chapter in the CBSE Class 9 Science syllabus as it builds the base to understand matter and its nature. Students can understand the chapter’s core concepts better by doing answer-writing practice with the help of NCERT solutions for Class 9 Science Chapter 1.

The NCERT solutions for Class 9 Science chapter 1 can be used to learn more about the our surroundings. The NCERT solutions are created by instructors with extensive conceptual knowledge. The answers provided make it simpler for students to acquire and comprehend the concepts. The NCERT solutions are also updated to reflect the most recent NCERT curriculum. Scroll down to know more on NCERT solutions for Class 9 Science Chapter 1.

## CBSE Class 9 Science Chapter 1: Overview

Everything is matter; the air we breathe, the food we eat, stones, clouds, stars, plants and animals, even a tiny drop of water or a particle of sand. The matter is something that occupies space (volume) and has mass. Since the beginning, human beings have been trying to understand their surroundings.

Before getting into the detailed NCERT solutions Class 9 Science chapter 1, let us have an overview of topics and sub-topics included in the chapter:

### NCERT Solutions for Class 9 Science Chapter 1 PDFs

The solutions for NCERT Science Class 9 chapter 1 provided here on Embibe are solved by experts in an easy-to-understand language for all CBSE Class 9 students. This will help them understand the concepts, thus, encouraging active learning and not rote learning. Refer to the link below to download the PDF:

Q.1. Convert the following temperatures to celsius scale.
(a) 293 K
(b) 470 K

Solution: Kelvin is the primary unit of temperature (absolute scale) and degree celsius is commonly used along with it.

(a) We know,
Temperature in Kelvin = Temperature in °C+273
Temperature in °C = (Temperature in Kelvin – 273)
=293-273=20°C
Therefore, 293K=20°C.
(b) We know,
Temperature in Kelvin = Temperature in °C+273
Temperature in °C = (Temperature in Kelvin – 273)
=470-273=197°C
Therefore, 470K=197°C.

Q.2. Convert the following temperatures to Kelvin scale.
(a) 25°C
(b) 373°C

Solution: Kelvin is the primary unit of temperature (absolute scale) and degree celsius is commonly used along with it.

(a) We know,
Temperature in Kelvin = Temperature in °C+ 273
=25+273=298K
(b) We know,
Temperature in Kelvin = Temperature in °C+ 273
=373+273=646K

Q.3. Give reason for the following observation.
Naphthalene balls disappear with time without leaving any solid.

Solution: Naphthalene balls disappear with time without leaving any solid due to the phenomenon of sublimation. Sublimation is the change of state from a solid to a gas without the intervention of a liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.

### NCERT Solutions for Class 9 Science Chapter 1: Summary

Matter refers to everything that has mass and occupies space. Air and water, sugar and sand, hydrogen and oxygen, etc. The matter is made up of incredibly tiny particles. Particles of substance are drawn to one another because of their distance.

Based on interparticle forces and the arrangement of the particles, matter can be divided into three categories: solid, liquid, and gas. It is possible to change between these three different types of matter by varying the temperature and pressure. Refer to the table below to understand it better:

### FAQs on NCERT Solutions for Class 9 Science Chapter 1

Q.1: Where can I get NCERT Solutions for Class 9 Science?

Ans: Students can get chapter-wise NCERT solutions for Class 9 Science on Embibe.

Q.2: Is NCERT sufficient for Class 9 Science?

Ans: Yes, if students study from NCERT books and solutions, they can score good marks in the exams.

Q.3: For any substance, why does the temperature remain constant during the state change?

Ans: It is due to the latent heat. as the heat supplied to increase the substance’s temperature is used to transform the substance’s state of matter; hence, the temperature stays constant.

Q.4: Are the NCERT solutions Class 9 Science chapter 1 available in PDF format?