Question

XBr is the formula for a metallic bromide. If the metal X were to become an oxide, the formula would be: a) XO b) X203 c) X20 d) None of the above 2. What type of reaction occurs in your stomach when you take an antacid? a) decomposition b) neutralization c) single displacement d) combustion Covalent bonds are due to the: A) transfer of electrons from one atom to another B) attraction between ions of opposite charge C) magnetic force of attraction between two atoms D) sharing of two electrons by two atoms Chemical equations are balanced according to which law? a) The Law of Conservation of Mass b) The Law of Thermodynamics c) The Law of Mass Action d) The Law of Definite Proportions Consider the reaction of XY + element Z. If element Z is a non-metal the possible products are: a) XZ+Y b) YZ+X c) both A and B d) none of the above Skeletal muscle is attached to the bones by A) Tendons B)Cartilage C)Ligaments D) Other muscles What is the correct structural hierarchy, in order from most complex to simplest of the structures listed below? A)digestive tract tissue, human, digestive system, stomach B) stomach, digestive system, human, digestive tract tissue C)human, digestive system, stomach, digestive tract tissue D)digestive tract tissue, stomach, digestive system, human

Answer 1

1) c) X2O

the oxidation state of oxygen is -2 and X is -1(-1x2=2)

2) b) Neautralisation is takes place in the stomach while we taken the antacid

3) d) sharing of electrons by 2 atoms forms covalent bond

4) a) law of conservation of mass makes balancing of chemical equations. According to this law, matter can neither be created nor destroyed in chemical reaction