📄 GuideActivity 9.5 To check the solubility of some compounds in water and organic solvents. Class 9
Activity 9.5 To check the solubility of some compounds in water and organic solvents. Class 9Activit
📄 GuideCalculate the molecular mass of nitric acid (HNO3). Class 9
Calculate the molecular mass of nitric acid (HNO3). Class 9Question 1. Calculate the molecular mass
📄 GuideCalculate the molecular mass of water (HaO). Class 9
Calculate the molecular mass of water (HaO). Class 9Question 1.Calculate the molecular mass of water
📄 GuideSodium chloride (NaCl) has sodium and chlorine in the mass ratio sodium. Class 9
Sodium chloride (NaCl) has sodium and chlorine in the mass ratio sodium. Class 9Question 1. Sodium c
📄 GuideActivity 9.3 To verify the law of conservation of mass by carrying out a chemical reaction. Class 9
Activity 9.3 To verify the law of conservation of mass by carrying out a chemical reaction. Class 9A
📄 GuideStudents place 4 g of calcium carbonate with 2.92 g of hydrochloric acid. Class 9
Students place 4 g of calcium carbonate with 2.92 g of hydrochloric acid. Class 9Question 1. Student
📄 GuideActivity 9.2 To investigate whether mass is conserved during a chemical change. Class 9
Activity 9.2 To investigate whether mass is conserved during a chemical change. Class 9Activity 9.2(
📄 GuideActivity 9.1 To verify that mass is conserved during a physical change. Class 9
Activity 9.1 To verify that mass is conserved during a physical change. Class 9Activity 9.1Aim: To v
📄 GuideIn an atom, there are 12 protons and 12 neutrons in the nucleus. Class 9
In an atom, there are 12 protons and 12 neutrons in the nucleus. Class 9Question 1. In an atom, ther
📄 GuideAman was discussing the structure of atom with his classmates. Class 9
Aman was discussing the structure of atom with his classmates. Class 9Question 1. Aman was discussin
📄 GuideComplete the Table. Aman was discussing the structure of atom with his classmates. Class 9
Complete the Table. Aman was discussing the structure of atom with his classmates. Class 9Question 1
📄 GuideAn atom 70X has 31 electrons. How many neutrons are there in its nucleus? Class 9
An atom 70X has 31 electrons. How many neutrons are there in its nucleus? Class 9Question 1. An atom
📄 GuideBoth Rutherford’s and Bohr’s models have electrons orbiting the nucleus. Class 9
Both Rutherford’s and Bohr’s models have electrons orbiting the nucleus. Class 9Question 1. Both Rut
📄 GuideFind the following information for the elements shown in Fig. Class 9
Find the following information for the elements shown in Fig. Class 9Question 1. Find the following
📄 GuideMagnesium is essential for many biological processes, including muscle contraction. Class 9
Magnesium is essential for many biological processes, including muscle contraction. Class 9Question
📄 GuideThe discovery of subatomic particles helped in understanding the atomic structure. Class 9
The discovery of subatomic particles helped in understanding the atomic structure. Class 9Question 1
📄 GuideElectrons move around the nucleus in orbits. Why do they not fly away from the atom? Class 9
Electrons move around the nucleus in orbits. Why do they not fly away from the atom? Class 9Question
📄 GuideExplain and arrange the following statements in the correct chronological. Class 9
Explain and arrange the following statements in the correct chronological. Class 9Question 1. Explai
📄 GuideWhat conclusion did Rutherford draw about the position and characteristics. Class 9
What conclusion did Rutherford draw about the position and characteristics. Class 9 Question 1. What
📄 GuideThe composition of the nuclei of three atomic species X, Y, and Z are given as follows. Class 9
The composition of the nuclei of three atomic species X, Y, and Z are given as follows. Class 9Quest
📄 GuideWhich of the following statements are correct or incorrect according to the Bohr’s atomic model? Class 9
Which of the following statements are correct or incorrect according to the Bohr’s atomic model? Cla
📄 GuideChoose the correct options and explain the reason for the correct and incorrect options. Class 9
Choose the correct options and explain the reason for the correct and incorrect options. Class 9Revi
📄 GuideIf a bromine atom is available in the form of, say two isotopes. Class 9
If a bromine atom is available in the form of, say two isotopes. Class 9Question 1. If a bromine ato
📄 GuideSolve this riddle. I am an atom with a mass number of 23 and 11 protons. Class 9
Solve this riddle. I am an atom with a mass number of 23 and 11 protons. Class 9Question 1. Solve th
📄 GuideIdentify the number of electrons in the outermost shell of the following elements. Class 9
Identify the number of electrons in the outermost shell of the following elements. Class 9Question 1
📄 GuideAn atom has 18 neutrons and an atomic number of 17. What is its mass number? Class 9
An atom has 18 neutrons and an atomic number of 17. What is its mass number? Class 9Question 1. An a
📄 GuideAn atom with an atomic number of 26 has 56 nucleons. Find out its number of electrons. Class 9
An atom with an atomic number of 26 has 56 nucleons. Find out its number of electrons. Class 9Questi
📄 GuideImagine you are a scientist who has discovered a new element. Class 9
Imagine you are a scientist who has discovered a new element. Class 9Question 1. Imagine you are a s
📄 GuideIf you could ask Rutherford one question about his work, what would it be? Class 9
If you could ask Rutherford one question about his work, what would it be? Class 9Question 1. If you
📄 GuideWhat do you think would happen if a-particles were replaced with negatively. Class 9
What do you think would happen if a-particles were replaced with negatively. Class 9Question 1. What
📄 GuideCould an orange or a lemon, which also contain seeds inside soft pulp. Class 9
Could an orange or a lemon, which also contain seeds inside soft pulp. Class 9Question 1. Could an o
📄 GuideSuppose you made up your own ‘atom’, as Thomson described, using clay. Class 9
Suppose you made up your own ‘atom’, as Thomson described, using clay. Class 9Pause and Ponder (Page
📄 GuideAre atoms the smallest indivisible particles? Class 9
Are atoms the smallest indivisible particles? Class 9Think It Over (Page 140)Question 1. Are atoms t
📄 GuideA coconut of mass 1.5 kg falls from the top of a coconut tree onto the wet sand on a beach. Class 9
A coconut of mass 1.5 kg falls from the top of a coconut tree onto the wet sand on a beach. Class 9Q
📄 GuideThe potential energy-displacement graph of a 0.5 kg ball moving along a frictionless. Class 9
The potential energy-displacement graph of a 0.5 kg ball moving along a frictionless. Class 9Questio
📄 GuideA 1000 kg car is moving along a road at a constant speed. Suddenly. Class 9
A 1000 kg car is moving along a road at a constant speed. Suddenly. Class 9Question 1. A 1000 kg car
📄 GuideThe gravitational attraction on the surface of the Moon. Class 9
The gravitational attraction on the surface of the Moon. Class 9Question 1. The gravitational attrac
📄 GuideA 10.0 kg block is moving on horizontal floor with negligible friction. Class 9
A 10.0 kg block is moving on horizontal floor with negligible friction. Class 9Question 1. A 10.0 kg
📄 GuideA ball of mass 2 kg is thrown up with a velocity of 20 m. Class 9
A ball of mass 2 kg is thrown up with a velocity of 20 m. Class 9Question 1. A ball of mass 2 kg is
📄 GuideOn a seesaw with sliding seats, a child is sitting on one side and an adult on the other side. Class 9
On a seesaw with sliding seats, a child is sitting on one side and an adult on the other side. Class
📄 GuideWhich factors determine the energy required to raise a flag from the ground. Class 9
Which factors determine the energy required to raise a flag from the ground. Class 9Question 1. Whic
📄 GuideA crane lifts a mass m to the 10th floor of a building in a certain time. Class 9
A crane lifts a mass m to the 10th floor of a building in a certain time. Class 9Question 1. A crane
📄 GuideA student is slowly lifted straight up in an elevator from the ground level. Class 9
A student is slowly lifted straight up in an elevator from the ground level. Class 9Question 1. A st
📄 GuideFor each of the following situations, identify the energy transformation that takes place. Class 9
For each of the following situations, identify the energy transformation that takes place. Class 9Qu
📄 GuideWhen a ball thrown upwards reaches its highest point, tick the correct statement. Class 9
When a ball thrown upwards reaches its highest point, tick the correct statement. Class 9Question 1.
📄 GuideThe expression for kinetic energy of a body of mass m and velocity. Class 9
The expression for kinetic energy of a body of mass m and velocity. Class 9Question 1. Fill in the b
📄 GuideWork is said to be done when a force is applied, even if the object does not move. Class 9
Work is said to be done when a force is applied, even if the object does not move. Class 9Revise, Re
📄 GuideThroughout history, many designs of perpetual machines have been proposed. Class 9
Throughout history, many designs of perpetual machines have been proposed. Class 9Question 1. Throug
📄 GuideWhy is it easier to open the lid of a can by using a spoon as shown in Fig.? Class 9
Why is it easier to open the lid of a can by using a spoon as shown in Fig.? Class 9Question 1. Why
📄 GuideExplain why roads on hills are built to wind around in gentle slopes. Class 9
Explain why roads on hills are built to wind around in gentle slopes. Class 9Question 1. Explain why