Copper was mixed with nitric acid (HNO3). Fizzing and bubbling occurred along with a color change from colorless to blue. The gaseous product was collected in a test tube and exposed to a glowing splint.  A loud pop was heard.  (WCSP24) Identify the gas produced and indicate what observation would correspond to a different gas by making the following matches.

Read the volume measured in the graduated cylinder below.  Report the value with the appropriate number of significant figures and an uncertainty. (WCSP24)

18. ..continued b. (2 points) Determine the % error between the student’s observed wavelength and Bohr’s.   Enter the value in the box below (numerical characters only).

11.  A student is determining the Ideal Gas Law constant with the reaction of calcium carbonate and vinegar as shown below. Rather than using different moles of reactants and measuring volume of gas produced, the student decided to use different temperatures and measure the volume. (WCSP24.) 2 CH3COOH (aq) +  CaCO3 (s)

(WCSP24) Read the volume measured in the graduated cylinder below.  Report the value with the appropriate number of significant figures and an uncertainty.

19.  (WCSP, 5 points) Hydrogen bonding is responsible for many of the interesting and unusual properties of water. Draw a picture showing hydrogen bonding in liquid water.  Use three water molecules in your drawing and dashed lines to depict the hydrogen bonding interactions. Enter the number of hydrogen bond donor-acceptor interactions in the sketch.  

(WCSP24) Explain the “like dissolves like” principle. Use at least two specific examples in your explanation.

(WCSP24) Given the diagrams or processes below, indicate whether they are a chemical and/or physical change.   a) Water boiling    b) Burning a candle  c)  The process depicted in the figure below 

Religious expressions such as prayer, by students in public schools

What claim was central to the nativist perspective?