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A photon has the energy 5.55 × 10–19 J. What is this photon’s wavelength in nanometers? (1 nm = 10-9 m)

What is the overall charge for a calcium ion with 18 electrons?

A small car has a fuel efficiency of 28.1 miles per gallon (mi/gal). What is this fuel efficiency in kilometers per liter (km/L)? ( 1 mi = 1.609 km, 1 gal = 3.785 L). Show the calculation.

Using the periodic table, identify each element as a metal, a metalloid, or a nonmetal

Please determine the number of significant digits for the following number: 0.0073205

Complete the following calculation. Answer to the correct number of significant digits. 43.7 – 2.341 = 

image alt text Match the labeled item  with their respective description below:

This is an essay question. Type in your answer below: What muscles when contracted at the same time flexes your chin to your chest in a “praying” position?

This is an essay question.  Please type in your answer below: Which muscle types have the the troponin-tropomyosin complex needed for contraction and which muscle type does not? Explain.

Match the correct item to their function for homeostasis.