6. These are the number placed before the symbol or formula Acid-Base D. Superscript A. Coefficient B. Combination C. Subscript 7. What is correct sequence in balancing equation? Apply the Law of Conservation of Mass to get the same number of atom Take note of the elements in the reactant and in the product Count the number of atoms of each element present in the reactant and product A. |||,L, II B. II, II, I C. 11,111,1 D,||,1,|| 8. A reaction that has two compounds as reactants and two compounds as products might be described A. decomposition reaction C. double replacement B. combination D. single replacement 9. Two or more substances combine to form one substance is a A. decomposition reaction C. double replacement D. single replacement B. combination 10. Mg+ 2HCI MgCl₂ + H₂ is an example of a A. decomposition reaction C. double replacement B. combination D. single replacement 11. Quicktime (Cao) is used as a drying agent. When water is added to this, slaked lime Ca(OH) 2 is formed. What type of reaction is this? A. combination B. decomposition C double displacement D. single displacement 12. NaOH + KNO3 A. Double NaNO3 + KOH shows what kind of chemical reaction? B. Combustion C. Single D. Synthesis 13. From the given equations below, which of the following correctly describes a decomposition reaction? A. A + B C. AB aligned A+B\\ H aligned D. HCI + B. AB + CD -> AD + CB matrix &AB\\ &AD matrix NaCl = H₂O 14. When the equation A!+ Bra→ AIBr; is balanced, the coefficient for Al is a. 1 b. 2 c. 3 d. 4 15. Given the chemical equation 2 CO (q) +O 2(p) 2 CO 2(g) . Which of the following statements is incorrect? A. All substances in this reaction are gases. B. Two hundred molecules of carbon monoxide are decomposed to form 200 molecules of carbon dioxide. C. Two molecules of carbon monoxide react with one molecule of oxygen gas. D. Two moles of carbon monoxide react with one mole of oxygen gas. 16. Which of the following is the correct balanced reaction? A. 2C_{5}*H_{8} + 10O_{2} -> 6 6C*O_{2} + 8H_{2}*O longrightarrow CO 2 +H 2 O B. C_{3}*H_{0} + O_{2} C. C_{3}*H_{3} + O_{2} -> 3C*O_{2} + 2H_{2}*O D. C_{3}*H_{5} + 5O_{2} 3C*O_{2} + 4H_{2}*O 17. From the given equation, how many Ag are there in the reactants? overline Ag +H2S A 9 2S+H2 A. 1 B. 2 C. 3 D. 4
