Is adding hot cocoa to hot water a chemical or physical change?

Two solutions, initially at 24.69°C, are mixed in a coffee cup calorimeter (Ccal = 105.5 J/°C). When a 200.0 mL volume of 0.100 M AgNO3 solution is mixed with a 100.0 mL sample of 0.100 M NaCl solution, the temperature in the calorimeter rises to 25.

What is the molar mass of ace tic acid

Find the value of x in 0•5x+2.6=5*0•35

What chemical reaction does this equation represent? 2KCl + Pb (NO3) 2 = 2KNO3 + PbCl2 A: Two molecules of potassium nitrate and one molecule of lead chloride react to form one molecule of lead nitrate and two molecules of potassium chloride.

Read the false statement. There are 18 periods in the periodic table. Which answer choice rewords the false statement so it is true? a. There are 18 elements in each period of the periodic table. b. There are 18 groups in the periodic table. c.

23 Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell? (1) oxidation (3) neutralization (2) reduction (4) transmutation

Which of the following is true? A) Gas atoms subjected to electricity emit bright lines of light. B) Gas atoms absorb white and emit a continuous spectrum of light. C) Gas atoms under high pressure emit dark lines against a continuous spectrum.

What common household element can, over time, reduce airflow, insulate components, reduce heat exchange or even cause the system to hang or reboot?

Clouds that form at an elevation of 3 kilometers will most likely be composed of A) raindrops B) ozone C) ice crystals D) sleet

Describe how glacial erosion influenced the topography of Ohio.