1. Which of the following is NOT an example of physical property? B. Length A. Texture C. Intensity D. Oxidizing property 2. Which of the following is ALWAYS TRUE about physical and chemical change? A. Both physical and chemical changes involve a change in in a substance's identity B. Physical changes are easily reversible while chemical changes are not C. chemical changes involve a change in color while physical change do not D. None of the above 3. Which of the following is both a pure substance anda compound? C. Yogurt 4. For a liquid substance with different boiling points, whnich separation technique would be best used? C. Distillation A. Gold B. Water D. Cement A. Evaporation B. filtration D. Chromatography 5. Which of the following is an example of homogeneous mixture? B. Air A. Halo-Halo C. Water and Sand D. Stones and oil
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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