Which statement best explains the expansion of the universe according to the Big Bang Theory?, Matter continuously appears to maintain constant density, The universe expanded from an extremely hot and dense state, The universe was formed instantly in its present size, Stars existed before the universe expanded, Which element is most abundant in nebulae and serves as the primary fuel for star formation?, Carbon, Oxygen, Hydrogen, Nitrogen, Which stage occurs after a protostar forms?, Nebula, Main sequence star, Supernova, White dwarf, The formation of iron inside massive stars mainly occurs through:, Nuclear fission, Big Bang nucleosynthesis, Stellar nucleosynthesis, Radioactive decay, Which statement best describes synthetic elements?, They occur naturally in large amounts on Earth, They are stable and non-radioactive, They are artificially produced and often radioactive, They are formed only during the Big Bang, Which synthetic element is commonly used as a neutron source in scientific research?, Uranium, Calcium, Californium, Magnesium, Which bond type forms when electrons are transferred from one atom to another?, Nonpolar covalent, Polar covalent, Metallic, Ionic, Which pair of atoms is most likely to form a nonpolar covalent bond?, H–Cl, C–H, Na–Cl, O–H, A molecule has polar bonds but is overall nonpolar. What best explains this?, The molecule contains only one type of atom, The bond dipoles cancel due to symmetrical shape, The electrons are equally shared in all bonds, The molecule has ionic bonds, Which molecule below is polar?, CO₂, CH₄, NH₃, BF₃, Which intermolecular force is present between all molecules?, Hydrogen bonding, Dipole–dipole interaction, Ion–dipole interaction, London dispersion force, Which substance would have the highest boiling point due to strong IMFA?, CH₄, NH₃, CO₂, O₂, Why does water dissolve sodium chloride effectively?, Water molecules form covalent bonds with NaCl, Ion–dipole attractions occur between ions and water, London forces dominate the interaction, Dipole–dipole forces repel the ions, Which property explains why water forms droplets on a waxed surface?, Viscosity, Density, Surface tension, Capillary action, A liquid with weak intermolecular forces will most likely have:, Low vapor pressure, High boiling point, Fast evaporation, High viscosity, Which biomolecule is primarily responsible for long-term energy storage?, Carbohydrates, Proteins, Lipids, Nucleic acids, Which food is the best source of quick energy during intense activity?, Brown rice, Pasta, Candy, Avocado, Why are unsaturated fats considered healthier than saturated fats?, They have higher melting points, They contain double bonds that prevent tight packing, They contain more cholesterol, They are solid at room temperature, Which molecule acts as a hormone that regulates blood sugar levels?, Keratin, Insulin, Collagen, Pepsin, Which monomer builds proteins?, Fatty acids, Nucleotides, Amino acids, Monosaccharides, Increasing which factor will most likely speed up a chemical reaction?, Lower temperature, Lower concentration, Smaller particle size, Removing the catalyst, Why does increasing temperature increase reaction rate?, Particles collide less frequently, Activation energy increases, Particles move faster and collide with more energy, Reactants become heavier, What is the main role of a catalyst?, Increase product mass, Raise energy activation, Change the reactants, Lower energy activation, Which statement is true about a balanced chemical equation?, Mass is created, Atoms are conserved, Products weigh more than reactants, Energy is balanced, n the reaction: 2H₂ + O₂ → 2H₂O, how many moles of water form from 2 moles of oxygen?, 2, 3, 4, 1, Which energy source is renewable and produces minimal air pollution?, Coal, Diesel, Biogas, Gasoline, Which energy source relies on heat from beneath Earth’s surface?, Solar, Wind, Geothermal , Biomass, Why is combining renewable energy sources beneficial?, It increases pollution, It ensures continuous energy supply, t reduces energy output, It increases fuel costs, Which ingredient is commonly used to remove grease in household cleaners?, Ammonium hydroxide, Sodium chloride, Sugar, Ethanol, What is the BEST practice when using household cleaning chemicals?, Mix products to increase effectiveness, Use without reading the label, Store them within children’s reach, Follow instructions and wear protection, Which statement best describes Big Bang nucleosynthesis?, Formation of heavy elements inside stars, Creation of light elements during the early universe, Formation of elements through radioactive decay, Production of synthetic elements in laboratories, Why does hydrogen serve as the main fuel for stars?, It is the heaviest element, It easily undergoes nuclear fusion, It absorbs heat efficiently, It does not emit radiation, Which process is responsible for the formation of elements heavier than iron?, Stellar fusion in small stars, Big Bang nucleosynthesis, Supernova nucleosynthesis, Chemical bonding, Which statement about polar covalent bonds is TRUE?, Electrons are transferred completely, Electrons are shared unequally, They occur only in metals, They form only nonpolar molecules, Which molecule is nonpolar despite having polar bonds?, H₂O, NH₃, CO₂, SO₂, Which pair of substances will most likely mix completely?, Oil and water, Hexane and water, Vinegar and water, Carbon tetrachloride and oil, Which intermolecular force explains the unusually high boiling point of water?, London dispersion forces, Dipole–dipole forces, Hydrogen bonding, Ion–dipole interaction, A liquid evaporates quickly at room temperature. What can be inferred about its IMFA?, Very strong, Moderate, Very weak, Ionic in nature, Which property of liquids increases as intermolecular forces increase?, Vapor pressure, Evaporation rate, Viscosity, Volatility, Which biomolecule is mainly responsible for forming cell membranes?, Proteins, Lipids, Carbohydrates, Nucleic acids, Why do polysaccharides provide sustained energy compared to simple sugars?, They dissolve slowly in water, They are broken down gradually, They contain fewer calories, They are not digested, Which type of fat should be limited in a healthy diet?, Unsaturated fat, Omega-3 fatty acids, Trans fat, Plant oils, Which statement best explains protein diversity?, Proteins are made of different elements, Amino acid sequence affects folding and function, All proteins have the same structure, Proteins function only as enzymes, Which molecule stores genetic instructions for protein synthesis?, Lipid, RNA, Carbohydrate, Enzyme, According to collision theory, which condition is necessary for a reaction to occur?, Reactants must be heated, Collisions must be effective, Products must be present, Pressure must be high, Which change will DECREASE the rate of chemical reaction?, Increasing temperature, Increasing concentration, Using a catalyst, Decreasing surface area, Why does a catalyst increase reaction rate?, It increases collision frequency, It lowers activation energy, It increases reactant mass, It produces more products, In the reaction: 4Fe + 3O₂ → 2Fe₂O₃, how many moles of iron oxide form from 3 moles of oxygen?, 1, 2, 3, 4, Which statement about limiting reactants is TRUE?, It is always the reactant with the smallest mass, It determines the amount of product formed, It remains completely unreacted, It is always listed first in the equation, Which energy source produces electricity using heat from Earth’s interior?, Solar , Wind, Geothermal , Biomass, Which is a major advantage of biogas over fossil fuels?, Higher energy content, Non-renewable supply, Reduces waste and pollution, Requires expensive fuel, Which energy source contributes MOST to greenhouse gas emissions?, Solar, Wind, Geothermal, Coal, Why are batteries necessary in solar power systems?, To increase sunlight, To store excess energy, To reduce panel size, To cool solar panels, Which household chemical is most effective in removing mineral deposits?, Sodium hydroxide, Ammonium hydroxide, Hydrochloric acid, Alcohol, What is the main function of hydrogen peroxide in cleaners?, Coloring agent, Thickener, Disinfectant, Fragrance, Which practice is UNSAFE when using household chemicals?, Wearing gloves, Reading labels, Mixing different cleaners, Proper storage, Which statement best supports using renewable energy in schools?, It is cheaper in all situations, It reduces environmental impact, It produces unlimited power, It requires no maintenance, Which factor does NOT affect reaction rate?, Temperature, Concentration, Color of reactants, Surface area, Which molecule is an example of a polar molecule?, O₂, N₂, H₂O, CO₂, Which statement best summarizes sustainable energy use?, Depend on one energy source only, Maximize fossil fuel consumption, Balance energy needs with environmental protection, Avoid renewable energy due to cost.

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