1 Ahmed is learning about early atomic models in his chemistry class. His teacher explains that John Dalton proposed the first scientific atomic theory. According to Dalton's model, what did he propose about atoms? A Atoms are divisible and can be split into smaller particles B Atoms are indivisible, solid spheres that cannot be created or destroyed C Atoms contain a nucleus with protons and neutrons D Atoms have electrons orbiting in fixed energy levels
2 Which property increases from left to right in a period? A Atomic radius B Metallic character C Ionization energy D Shielding effect
3 Chemical property is observed when a substance: A Changes color only B Changes shape C Undergoes chemical change D Melts
5 Electronegativity generally decreases: A Across a period B Down a group C From right to left D With increase in atomic number
6 Which branch of chemistry deals with carbon compounds? A Inorganic chemistry B Physical chemistry C Organic chemistry D Analytical chemistry
7 According to Bohr, electrons move in: A Random paths B Fixed energy levels C Straight lines D Nucleus
8 Which solution contains maximum solute at given temperature? A Dilute B Unsaturated C Saturated D Suspension
10 Amina is studying the periodic table and notices that elements in the same vertical column have similar chemical properties. She learns that these columns are called groups. In the periodic table, how many groups are there? A 7 B 8 C 18 D 32
11 Tina is learning about the historical development of chemistry. She reads that chemistry has evolved from alchemy. Which of the following is a major contribution of modern chemistry? A Turning lead into gold B Development of synthetic materials and medicines C Believing in the four elements D Focusing only on mystical theories
12 George is comparing the atomic size of chlorine and iodine. He knows that iodine is below chlorine in Group 17. Which element has the larger atomic size? A Chlorine B Iodine C Both have the same atomic size D Cannot be determined
14 Which branch is useful for studying chemical bonding? A Analytical chemistry B Organic chemistry C Physical chemistry D Environmental chemistry
15 Zara is making a solution of sugar in water. She heats the solution and adds more sugar, creating a solution that is unstable and will crystallize if disturbed. What type of solution is this? A Unsaturated B Saturated C Supersaturated D Dilute
16 Zara is studying the density of halogens. She notes that the density of halogens increases down the group. At room temperature, chlorine is a gas, bromine is a liquid, and iodine is a solid. What is the state of fluorine at room temperature? A Solid B Liquid C Gas D Plasma
17 What is chemistry? A Study of living organisms only B Study of matter, its properties and changes C Study of motion and force D Study of stars and planets
18 Which is a characteristic of non-metals? A Good conductor B Malleable C High melting point D Poor conductor
19 An element is a substance that: A Can be broken easily B Contains different atoms C Cannot be broken chemically D Is always solid
20 Which branch of chemistry deals with carbon compounds? A Inorganic chemistry B Physical chemistry C Organic chemistry D Analytical chemistry
21 Industrial chemistry is mainly related to: A Laboratory experiments only B Production of chemicals on large scale C Study of cells D Study of stars
22 Tina is studying noble gases. She knows that they are generally unreactive because they have a full valence shell. Which of the following is a noble gas? A Helium B Sodium C Chlorine D Iron
23 Julia is making lemonade. She adds sugar and lemon juice to water and stirs until the sugar disappears. The resulting liquid looks uniform throughout. What type of mixture is this? A Suspension B Colloid C Homogeneous mixture (solution) D Heterogeneous mixture
24 Atomic radius generally decreases across a period because: A More shells are added B Nuclear charge increases C Electrons are removed D Valency decreases
25 Usman is a materials scientist. He works on developing stronger and lighter alloys. Which branch of chemistry supports his work? A Inorganic chemistry and physical chemistry B Organic chemistry C Biochemistry D Nuclear chemistry
26 Which property helps predict bonding behavior? A Atomic mass B Electronegativity C Density D Color
27 Amina is studying the definition of chemistry in her science class. She learns that chemistry is the branch of science that deals with the composition, structure, properties, and reactions of matter. Based on this definition, which of the following best describes the scope of chemistry? A It only studies living organisms B It studies matter and the changes it undergoes, including energy changes C It focuses only on the earth's atmosphere D It exclusively studies nuclear reactions
28 Chemistry is linked with technology because it: A Stops inventions B Provides new materials C Avoids experiments D Reduces knowledge