1) Which or the following is not a sing of a chemical reaction? a) a new substance is formed. b) a change in temperature occurs c) a solid melts into a liquid 2) When vinegar is mixed with baking soda, bubbles form. What does this indicate? a) a physical change b) a chemical reaction producing gas c) a change in shape 3) Which of the following is a property of acids? a) tastes sweet b) feels slippery c) tastes sour d) turns red litmus paper blue 4) Which of the following is an alkali (base)? a) lemon juice b) vinegar c) soap d) orange juice 5) What do we use to measure the strength of acids and bases? a) a thermometer b) a ruler c) the pH scale d) a beaker 6) What is the pH range of acids? a) greater than 7 b) 7 c) less than 7 d) more than 14 7) Toothpaste is an example of an acid. a) True b) False 8) Why is it important to handle strong acids and alkalis carefully? a) they can burn the skin and eyes b) they are good to drink c) they always smell nice 9) What is the purpose of an indicator? a) to measure the temperature b) to test for electricity c) to show whether a substance is acidic, neutral or alkaline 10) What color does red litmus paper turn in an alkali? a) red b) blue c) orange d) white 11) All acids contain hydrogen. Eg. Hydrochloric acid-HCL, Sulfuric acid-H₂SO₄, Nitric acid - HNO₃. a) True b) False 12) All aids contain hydrogen, but not all hydrogen-containing substances are acids. a) true b) false 13) All alkalis contain hydroxide ions. Eg. Sodium hydroxide-NaOH, potassium hydroxide-KOH, calcium hydroxide-Ca(OH)₂. a) True b) false 14) What does the arrow in a chemical equation mean? a) it shows that a substance is disappearing. b) it shows that reactants are turning into products. c) it means the reactants are completely gone. 15) What is a reactant in a chemical reaction? a) the substance that is produced at the end b) the substance that speeds up the reaction c) the substance that reacts to form a product 16) What is a product in a chemical reaction? a) a substance that disappears during the reaction b) a new substance formed in the reaction c) a reactant that changes its state 17) What are the products when an acid reacts with a metal? a) metal oxide and water b) salt and oxygen gas c) water and carbon dioxide gas d) salt and hydrogen gas 18) When sulfuric acid reacts with zinc metal, what salt is formed? a) zinc chloride b) sodium sulfate c) zinc sulfate d) magnesium sulfate 19) When nitric acid reacts with magnesium metal, what salt is formed? a) magnesium chloride b) magnesium nitrate c) sodium chloride 20) What are the products when metals react with water? a) metal oxide and hydrogen gas b) metal hydroxide and hydrogen gas c) water and hydrogen gas d) water and carbon dioxide gas 21) A chemical equation shows the reactants and products in a reaction. a) true b) false 22) What can a chemical equation tell us? a) the substances are reacting b) the new substances are formed c) the position of atoms rearranged. d) all of the above 23) Most chemical reactions are easy to reverse. a) true b) false 24) Which of the following metals would react with acid to produce Zinc sulfate salt and hydrogen gas? a) Gold b) copper c) silver d) zinc 25) What happens when you put alkali metals into water? a) the metal reacts with water, producing a harmless solution b) the metal reacts violently, producing hydrogen gas and sometimes exploding c) nothing happesn

Revising acids, bases & chemical reactions

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