Select the correct answer. How does a catalyst increase the speed of a reaction?

Can anyone answer these questions? ? i need it before 1: 00pm today

Which of the following represents a balanced nuclear equation showing bismuth-212 undergoing alpha decay followed by beta decay? (2 points) superscript 212 over subscript 83 bi yields superscript 4 over subscript 2 he + superscript 208 over subscript 81 tl yields x−superscript 208 over subscript 82 pb + superscript 0 over subscript -1 beta superscript 212 over subscript 83 bi + superscript 0 over subscript -1 beta yields superscript 4 over subscript 2 he + superscript 208 over subscript 81 tl yields x−superscript 208 over subscript 82 pb superscript 216 over subscript 85 as yields superscript 4 over subscript 2 he + superscript 216 over subscript 85 as yields superscript 216 over subscript 85 pb + superscript 0 over subscript -1 beta superscript 212 over subscript 83 bi yields superscript 0 over subscript -1 beta + superscript 208 over subscript 81 tl yields superscript 208 over subscript 82 pb + superscript 4 over subscript 2 he

Ireally don’t understand! ! 1. identify the following 3 compounds as an acid or base. explain how you determined whether the compound was an acid or base. nh4ohhcio3fe(oh)3 2. what is the percent composition copper and bromine in cubr₂? show your work3.write a balanced equation for the following reaction: __zns + __aip —> __zn3p2 + __al2s3