1 Chloe is mixing oil and water. After shaking, she notices that tiny droplets of oil are dispersed throughout the water but they do not settle out easily. This mixture is best classified as: A Solution B Colloid C Suspension D Compound
3 Xia is making a solution of iodine in alcohol (tincture of iodine). She knows that iodine is the solute and alcohol is the solvent. What type of solution is this based on the states of solute and solvent? A Solid in liquid B Liquid in liquid C Gas in liquid D Solid in solid
4 Yara is a science student learning about the importance of chemistry. She understands that chemistry helps in solving real-world problems. Which of the following is a global problem that chemistry addresses? A Climate change and sustainable energy B The study of history C The development of languages D The creation of art
6 Rania is studying physical chemistry applications. She learns that it helps in understanding energy changes in reactions. Which of the following is a physical chemistry concept applied in batteries? A Electrochemistry B Organic synthesis C Polymerization D Fermentation
8 Yara is learning about the definition of chemistry. She reads that chemistry is also called the 'central science' because it connects physics with other natural sciences. Which of the following best supports this statement? A Chemistry is only about mixing chemicals B Chemistry overlaps with biology, physics, and earth sciences C Chemistry is a branch of mathematics D Chemistry is the study of living things only
9 Khalid is learning about the different forms of carbon. He knows that diamond is hard and transparent, while graphite is soft and opaque. These are different forms of the same element. What are these forms called? A Isotopes B Allotropes C Isomers D Polymers
10 Sam is studying a gas that is found in neon signs. The gas glows when electricity passes through it. This state of matter is called: A Gas B Plasma C Liquid D Solid
11 Usman is investigating the rusting of iron for his science project. He wants to understand the chemical process. Which branch of chemistry is most relevant to studying rusting? A Organic chemistry B Inorganic chemistry C Biochemistry D Polymer chemistry
13 George is trying to compress a gas in a syringe. He pushes the plunger, and the gas compresses easily. He then tries to compress a solid metal rod. He cannot compress it. What property of matter explains this difference? A Density B Fluidity C Compressibility D Solubility
16 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
17 Carlos is investigating the rusting of iron. He observes that rust forms when iron reacts with oxygen and water. What is the chemical name for rust? A Iron oxide B Iron sulfide C Iron chloride D Iron nitrate
18 Ming is preparing a concentrated solution of sodium chloride. He adds more solute to the solvent. How does the concentration of the solution change? A It decreases B It increases C It stays the same D It becomes saturated
20 Xia is studying the chemistry of paints. She learns that paints contain pigments and binders. Which branch of chemistry is involved in paint formulation? A Polymer chemistry and inorganic chemistry B Biochemistry C Nuclear chemistry D Astrochemistry
21 A heterogeneous mixture has: A Uniform composition B Same properties throughout C Non-uniform composition D Only liquids
22 Bongani is studying the application of science, technology, and engineering. He examines how engineers use chemical knowledge to design water treatment plants. What is the main chemical process involved in water treatment? A Polymerization B Coagulation and disinfection C Fermentation D Cracking
23 Nadia is exploring astrochemistry. She learns that it studies the chemical composition of stars and planets. Which of the following would an astrochemist most likely study? A The Earth's oceans B The atmosphere of Mars C The human digestive system D Soil composition in a forest
24 Lara is studying a solution of hydrochloric acid in water. The water is the solvent. What type of solution is this based on the solvent? A Liquid solution B Aqueous solution C Gaseous solution D Solid solution
25 Environmental chemistry helps to: A Increase pollution B Control pollution C Ignore waste D Study stars