1) Which is the part of a solution that is in greatest quantity? a) solute b) solvent c) element d) compound 2) A solution is always the same ___________________as its solvent. a) state of matter b) color c) texture d) smell 3) What is the concentration of a 0.1L solution of water with 20 grams of dissolved salt? a) 0.2 g/L b) 20.0 g/L c) 2.0 g/L d) 200.0 g/L 4) A 300 ml sample of wine was found to contain 37.5 ml of ethanol. What is the percentage by volume concentration of ethanol in the wine sample a) 12.5% b) 8% c) .125% d) .08% 5) What is the volume of methyl in a 20 ml methyl and water solution that contains 25% of methyl? a) 4 ml b) 5 ml c) 6 ml d) 7 ml 6) Which of the following solutions is the most diluted? a) A solution of 5 grams of salt with a volume of 100 mL. b) A solution of 10 grams of salt with a volume of 1000 mL. c) A solution of 20 grams of salt with a volume of 1000 mL. d) A solution of 50 grams of salt with a volume of 1000 mL. 7) Solubility is the ability of a solute to dissolve into a solution which of the following statement is true about solubility? a) More solute can dissolve in a solution if its solubility is high. b) More solute can dissolve in a solution if its solubility is low. c) More solute can dissolve in a solution if its solubility is neutral.. d) The amount of solute that can dissolve depends on the solvent, not solubility. 8) Which statement about substances is true? a) A substance cannot be separated from a mixture. b) When two or more substances are evenly mixed, we can separate them physically. c) Substances can be elements or solutions. d) If If two or more substances are physically blended, the new blend is called a compound. 9) In which way is solubility different than concentration? a) Unlike concentration, solubility does not depend on the amount solvent. b) Solubility can change based on temperature and pressure, but concentration can only change due to the total volume of the solution. c) Solubility is a measurement of how much solute can possibly dissolve, but the concentration is a measurement of how much solute is dissolved. d) Unlike concentration, solubility depends on the amount of solute dissolved in the total solution. 10) Which statement about solutions and homogeneous mixtures is correct? a) Solutions are liquid, but homogeneous mixtures can be any state of matter. b) Solutions and homogeneous mixtures are actually the same thing c) Solutions can only be separated by chemical reactions, but homogeneous mixtures can be separated by physical changes.A d) Solutions are made up of two elements mixed together, but homogeneous mixtures are made from two compounds mixed together. 11) Which factor does not affect Solubility? a) Temperature b) Pressure c) Amount of Substances d) Time 12) Which of the statements is true about pressure and solubility? a) Pressure increases the solubility of solids in the solution. b) Pressure increases the solubility of gases in the solution. c) Pressure increases the solubility of liquids in solution. d) Pressure has no effect on solubility. 13) A concentrated solution can be obtained from a diluted one by: a) Increasing the amount of solvent b) Decreasing the surface area of the solute c) Increasing the amount of solute or decreasing the amount of solvent by heating d) Decreasing the amount of solute by cooling 14) What is an unsaturated solution? a) A solution that contains the maximum amount of solute b) A solution that has no solute dissolved c) A solution that contains less solute than its solvent in solubility. d) A solution that contains more solute than its solubility 15) What happens to the solubility of a gaseous solute in a liquid solvent as the temperature increases? a) It increases. b) It decreases. c) It stays the same. d) It first increases, then decreases. 16) The amount of solute dissolved in a certain amount of solvent called? a) Concentration b) Solubility c) Saturation d) Supersaturation 17) Which of the following factors does NOT affect the rate of dissolving a solid solute in a liquid solvent? a) Temperature b) Stirring c) Surface area d) Color of the solute 18) What happens to a supersaturated solution over time? a) It stays the same forever. b) It releases excess solute as crystals. c) It dissolves more solute. d) It evaporates completely. 19) Which glass shows a more concentrated solution? a) A. The lighter-colored juice b) B. The darker-colored juice c) C. Both are equally concentrated d) D. Neither one is concentrated 20) Which bottle contains a more concentrated solution? a) A. The 5% distilled vinegar b) B. The 15% cleaning vinegar c) C. Both have the same concentration d) D. Neither one is concentrated 21) A Car winshield cleaning solutions needs a teaspoon of dish soap into a bucket of water. What type of solution is being prepared? What type of solution is being prepared? a) A. Saturated solution b) B. Dilute solution c) C. Supersaturated solution d) D. Concentrated solution 22) What determines whether a solute can dissolve in a solvent? a) The size of the solute particles b) The physical state of the solute c) The solubility of the solute in the solvent  d) The temperature of the solvent 23) The pH scale is ranges from: a) 0-7 b) 0-14 c) 1-7 d) 1-14 24) A solution with a ph level of 3.6 would be? a) Acid b) Base c) Neutral d) Acid and Base 25) The lower the pH, the greater the concentration of: a) OH- b) H+ c) NaCl+ d) H- 26) What are the reactants of for the reaction of metal with water? Metal + water ---> metal hydroxide + hydrogen a) Metal hydroxide and hydrogen b) Metal + Water c) Metal d) Water 27) What base is produced when magnesium reacts with water? a) Magnesium hydroxide b) Copper hydroxide c) Magnesium oxide d) Magnesium 28) Which of the following is an example of an acid? a) Sodium hydroxide (NaOH) b) Sucrose (C₁₂H₂₂O₁₁) c) Sodium bicarbonate (NaHCO₃) d) Acetic (CH₃COOH) 29) Nuetral Solutions have a pH of a) 0 b) 7 c) 1 d) 14 30) Which of the statement is true about Acid and bases? a) Acids mixed with bases neutralize each other b) acids mixed with bases make stronger bases c) Acids and bases don't react with each other d) Acids mixed with bases make stronger acids 31) What does magnification refer to in microscopy? a) The ability to distinguish between two closely spaced objects b) The ability to enlarge the image of an object c) The ability to focus light on a specimen d) The ability to make the specimen appear smaller 32) What is the main difference between a simple microscope and a compound microscope? a) A simple microscope uses a beam of electrons for magnification b) A simple microscope has a single lens, while a compound microscope has two or more lenses c) A compound microscope can only magnify in low magnification d) A simple microscope uses a condenser to focus light 33) Which part of a compound microscope is responsible for holding the slide containing the specimen? a) Eyepiece b) Stage c) Objective Lenses d) Condenser 34) What is the role of the condenser in a compound microscope? a) To focus light on the specimen b) To magnify the specimen c) To hold the slide in place d) To adjust the distance between the eyepieces 35) Which of the following microscopes uses a beam of electrons for magnification? a) Simple Microscope b) Compound Microscope c) Electron Microscope d) Optical Microscope 36) What is the first step when using a microscope? a) Adjust the eyepiece distance b) Choose the objective lens c) Prepare the specimen d) Turn on the light 37) What does the focusing knob on a microscope help to do? a) Adjust the distance between the eyepieces b) Illuminate the specimen c) Bring the image into clarity d) Magnify the specimen 38) Which part of the microscope do you look through to see the specimen? a) A) Objective lens b) B) Condenser c) C) Eyepiece (Ocular) d) D) Stage 39) When switching to a higher magnification, which part of the microscope should you adjust carefully to keep the image clear? a) A) Stage b) B) Focusing knobs c) C) Light source d) D) Condenser 40) Why is microscopy important in science? a) A) It helps scientists measure the size of large objects b) B) It allows scientists to explore and understand the microscopic world c) C) It helps scientists build telescopes d) D) It allows scientists to magnify sound waves

Science 7: Mixture and Solutions, Dilute and Concentration plus Microscopy

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