1) Choose the chemical change a) b) c) d) 2) Which of the following is a chemical change a) b) c) d) 3) How many atom of oxygen are present in CO2+2HO2 a) 2 b) 4 c) 6 d) 8 4) The Law of Conservation of Mass states that... a) Mass can be created but can't be destroyed b) Mass cannot be created but can be destroyed c) Mass cannot be created d) Mass cannot be created or destroyed 5) Which is the correct formula for: three hydrogen (H) one sulfur (S) four oxygen (O) a) H3SO4 b) H4S3O c) HSO4 d) H2O 6)  In the equation, 2Mg + O2 ---> 2MgO, which are the reactants? a) Mg and MgO b) 2Mg and O2 c) 2MgO d) O and MgO 7) 2H2O + 2N → 4H + 2NO The chemical symbols on the RIGHT (at the end of the equation) are called: a) yields/produces b) reactants c) products 8) Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced? a) CO2 + H2O --> C6H12O6 + O2 b) 2CO2 + H2O --> C6H12O6 + O2 c) C6O + H12O --> C6H12O2 d) CO2 +H2O --> C6H12O6 +O2 9) How is a physical change different from a chemical change? a) Chemical changes produce a new substance, physical changes stay the same substance b) Chemical changes create and destroy matter, physical changes don't c) There is absolutely no difference d) Physical changes create and destroy matter, chemical changes dont 10) Matter can not be created nor destroyed: it can only be a) Destroyed a little bit b) Transformed, Changed c) Invisible d) None of the above 11) A precipitate is a a) liquid that forms when two solids are reacted b) a gas that forms when vinegar and baking soda react c) a solid that forms when two liquids are mixed d) a change of color in a solution 12) Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will be the mass of the frozen water? a) 50g b) 200g c) 100g d) 400g 13) How many atoms do you have in the compound 2MgCl2? a) 2 atoms b) 6 atoms c) 4 atoms d) 8 atoms 14) How many atoms do you have in the chemical formula 2Mg(ClO3)2? a) 2 atoms b) 9 atoms c) 18 atoms d) 7 atoms 15) Does the equation H2+O2 →H2O follow the Law of Conservation of Mass? a) Yes, because the atoms are equal b) No, because there are more atoms in the reactants c) No, because there are more atoms in the product d) No, because more info is needed 16) Which group of nonmetals is the most reactive a) Group 1 b) Group 18 c) Group 7 d) Group 17 17) A subatomic particle, contained in the nucleus of an atom, having the same mass as a proton but no electrical charge a) proton b) electron c) neutron d) valence 18) How many elements are represented in this compound? 3NaHCO a) 5 b) 6 c) 4 d) 3 19) Elements that have the same number of energy levels are said to be in the same a) group b) family c) period d) classification 20) Atoms with similar properties are most likely located... a) in the same period b) in different periods c) in the same group d) to the right and left of each other

Chemistry 1

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