Welcome to your Chemical Formulae and Chemical Equations (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. What is matter that is made up of only one kind of atom called?MixtureElementCompoundGas2. You can tell a chemical reaction because it always produces … WaterA change of stateReactantsA different substance3. Fill in the blanks:_______ cannot be created or destroyed, but can be __________ from one form to another.Gases, sentMatter, changedMatter, producedLiquids, changed4. What are the coefficients of the correctly balanced equations? ----Fe2O3 + ----CO ----Fe + ---CO22,6,4,31,3,2,31,2,2,20,2,2,35. The mixture of gases used by deep sea divers is _______Nitrogen-hydrogenOxygen-nitrognHelium-oxygenHydrogen-helium6. What is the LAW of Conservation of Mass?Chemical equationsChemical equation must be balanced because matter cannot be created or destoryed.Cannot be created or destroyCan destroy or create7. The components elements of soap aresilicon and oxygencalcium, carbon and oxygensodium, oxygen, carbon and hydrogencarbon, hydrogen and oxygenwater, sodium, oxygen and hydrogen8. Which of the following represents a chemically balanced decomposition reaction of nickel (III) oxide into its elements?2Ni3O2 → 4Ni + 3O2Ni2O3 + H2O2 → 2Ni + 3O2 + H22NiO → 2Ni + O22Ni2O3 → 4Ni + 3O29. What Makes Chemical Equations Balanced?Same number of chemical reactionNone aboveSame number of molecues in atomsSame Number of atoms of each element in both side of reaction10. Aluminum reacts with copper sulphate to produceCu and Al2(SO4)3CuO, Al2S3 and SO2Cu, Al2S3 and SO2CuO and Al2(SO4)311. Which among the following are endothermic processes?i. Reaction of quick lime with water ii. Dilution acid with water iii. Evaporation of water iv. Sublimation of solid ammonium chloride(i) and (ii)(i) and (iv)(iii) and (iv)(ii) and (iii)12. Which of these is TRUE of mixtureCan be represented by a chemical formulaComponents cannot be separated by physical methodsProperties are the sum of those of its individual constituentsNone of the aboveAlways homogenous13. Which of these is a compound?GoldFruit saladRustSalt water14. Which of the following factors does NOT affect the rate of a chemical reaction?Number of particles reactingTemperature of the reactantsColour of the reactantsSize of the reactants15. Which of the following is a chemical change?FreezingMeltingBurningContracting16. When iron rusts, the kind of change that takes place isphysicalchemicalstatemixture17. An example of mixture isrustoxygenfruit saladsalt18. If two liquids are mutually soluble, they are called _______ liquids.InsolubleImmiscibleMiscibleSoluble19. How many atoms of oxygen are on the left side?2H2O ---> 2H2 + O2OneThreeFourTwo20. Which one of the following factors increases the reaction rate?Diluting the reactantsMore collisions between the reacting particlesPlacing the reactants in the darkLowering the temperature of the reacting particles21 out of 20Time is Up!
