Denis S Exam 1 Name CHP11L8 Circle one best answer in each m

Denis S Exam 1 Name CHP11L8) Circle one best answer in each multiple choice. (4 pt each) 1. How many significant figures are in 0.30700? a) 3, b) 4, () 5 16 2. Witch concentration unit changes with temperature? a) ppm, b) ppb, c) % m/m, d) % m/v. 3. Formula CH0 has 1.2:1 for a) atom ratio, b) molecular ratio, o) mass ratio, d) volume ratio 4. The symbol of prefix, M. stands for a) milli, b) micro, c) mega, d) none of the above. The 2:32 in the balanced equation, 2NaN (s) element, compound, mixture 5. 3 N (g) + 2Na(s) refers to a) mass ratio, b) 6, Atomic mass is in the units of a) amu/atom, b) amu/mol,c) g/mol d) g/atom. 7. Calculate the following to the proper number of significant figures a) 14.3505 + 2.65-17. obo-1 t. b) (0.2501 ) (3.39x10\')= .Zy20:84.5x lol 3 Signia raat 8. Indicate whether each of the following represents element, con compound, mixture, atom, molecule, eatre on, or two of the above. elemcal

Solution

Answer 1. 5 Significant figures (Start counting for significant digits On the first non-zero digit (3) and Stop counting for significant digits On the last digit (0))

2. Molarity i.e. moles of solute/volume of solution i.e. %m/v changes with temperature.

3. C₆H₁₂O₆ has atom ratio of 6:12:6 i.e. 1:2:1

4. Symbol M stands for none of the given options.

5. The 2:3:2 stands for the Mass ratio in the balanced equation.

6. Atomic mass is in the units of g/mol.

7. Significant figures are a) 6

b) 3

c) 2