A cross-country skier can complete a 7.5 km race in 45 min. What is the skier's average speed? km/h

Calculate the wavelength of the laser light for a) d = 1/500 mm and b) d = 1/1000 mm. Use the modified "grating equation" given below: nλ =

3. Using Equation 18-5 and the pKIn value you found, determine the ratio [In-]/[HIn] at the pH in the middle of the range you studied (i. e., pH = 6.0 for bromocresol purple, pH = 7.0 for bromothymol blue, and pH = 7.7 for phenol red).

Is this statement true or false? Global warming may be a result of natural causes. A. True B. False and this question! Certain gases in the atmosphere trap heat on Earth. What is the name of this phenomenon? A. the greenhouse effect B.

Check all items common to bases: a-minerals b-metal c-gas d-H+ e-OH- d-nitrogen

4. Sarah is a track athlete who is tracking her workouts to improve her speed at the 400m dash. Currently, she is running the 400m in 50s. What is her current speed over this distance?

Which term best describes the type of bonding in magnesium chloride

This equation indicates that the reaction gives off heat. What is this type of reaction called? 2C4H10 + ? O2? 8CO2 + 10H2O + heat a. an exothermic reaction b. an endothermic reaction c. absorption reaction d. precipitation reaction

Given the balanced equation representing a reaction: C3H8 (g) + 5O2 (g) = = >3CO2 (g) + 4H2O (g) What is the total number of moles of O2 (g) required for the complete combustion of 1.5 moles of C3H8 (g) ? (1) 0.30 mol (3) 4.5 mol (2) 1.5 mol (4) 7.

What increases in equal steps of one from left to right in the Periodic Table for the elements lithium to neon?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.