17. Which is true regarding water? 18. What is the difference between a substance and a mixture? D. Filtration components A Compound of element B. Element of gases c. Mixture of gases D. Substances of gases A Substance can be separated while mixture cannot be separated B. Substance has many components while mixture has one only c Substance is heterogeneous while mixture is homogeneous 19. To separate salt from water in a seawater mixture, what process is used A Condensation 20. Which of the following is a property of mixture? B. Distillation C. Evaporation A. It has a definite composition B. It consists of a single phase. C It has a heterogeneous composition D. It can be chemically separated into its 21. Which of the following is a physical appearance of a substance? A. Complicated B. Homogeneous C. Heterogeneous DNon-uniform 22. Which one is the best way to determine whether an unknown sample is a substance A. Knowing its density C. Observing its physical appearance B. Tasting the given sample D. Testing its melting and boiling point 23. Which is NOT a technique to separate components of mixture? A. Condensation B. Distillation Filtration 24. Which of the following is a heterogeneous mixture? A. Air B. Oil in water 25. What is/are true for substance and mixture? 1. Pure substance melts completely II. Pure substance has a varying boiling point III Mixture does not melt completely IV. Mixture has a fixed boiling point. A. I and II only B. I and Ill only C. Evaporation D C. Stainless steel D. Soft drink C. ll and IV only D. I and IV only 26. What does it indicate when a sugar is heated in a test tube until it is completely changed into a black mass and droplets of water? A. Compound B. Element C. Mixture D. Solution 27. What substance is made by mixing two elements without being chemically combined? A. Compound B. Element C. Mixture D. Solution 28. What is the best way to use in separating iron parts from a mixture? A. Filter paper B. Magnet C. Water D. Spoon 29. Which of the following uses evaporation as a means of separating the components of the given mixture? A. Iron fillings and sand C. Sand and gravel B. Pebbles and water D. Sugar and water 30. Which of the following statements distinguishes pure substances from mixtures? A. Can be separated by physical means. B. Consists of two or more kinds of matter. C. Have no specific solubility and densities D. Have constant boiling temperature and melting temperature.
