a) What aqueous solution will precipitate Pb2+ (aq) ions but not Cu+(aq) or Mg2+(aq)? What aqueous solution will precipitate Cu+(aq) ions but not Mg2+(aq) ions? b) c) Using your answers to parts a and b, outline a procedure that would allow you to precipitate the Pb2+ first, followed by Cu+, and then Mg2+. You may also use flame test to confirm.

100 - 15 = 85 not 75

5. Identify the following as a physical or chemical change: (a) water boils at 212 °F (b) applying an electric current to water causing the evolution of a gas (c) some metal statues obtain a green color after years of exposure to the atmosphere (d) evaporation of water from a saline solution leaves a solid salt residue

Real-World Chemistry 1. Suppose you wanted to ship bananas from Puerto Rico to New York and the time required for shipment was 8 days. Will you choose to ship ripe bananas or green bananas? Why? 2. You may have heard the saying "One bad apple will spoil the whole barrel." Based on the results of | your experiment, do you think the statement may be true? Why?

What is 302 x 4903

Calculate the electrostatic force of repulsion for two protons separated by 93.0 pm. The charge of a proton is q = 1.6 x 10-1⁹ C. Express your answer to two significant figures and include the appropriate units. Fel = μA 2.7.10 6 Submit N Previous Answers Request Answer ? X Incorrect; Try Again; 5 attempts remaining Use the equation Fel = K(Q₁ Q₂/d²) to find the electrostatic force between the two particles. Q₁ and Q2 are the charges on the particles (charge of a proton here), and d is the distance of separation. The constant is given in the introduction and has the units Nm²/C². This means that the distance must be converted from picometers to meters using the relation 1 pm = 1 × 10¯ m. -12

a) An acetaminophen suspension for infants contains 80 mg/ 0.80 mL suspension. The recommended dosage is 15 mg/kg body weight. How many mL of this suspension should be given to an infant weighing 6.5 kg? b) A runner wants to run 10.0 km. She knows that her running pace is 3.5 m s- 1. How many minutes must she run?

(7.211*10^5)*(5.3413*10^4)/4.09*10^-7

% error =  (experimental value - accepted value) x 100                                Accepted value    Siver 10.06cm^3 -10.49cm^3  *100 / 10.49  Is this correct ?

Every year Every second (1 year 365 days).