Which is the most common nutrient deficiency in the world?

a. iron

b. zinc

c. copper

d. calcium

Methane, or CH4, is an example of a molecule whose atoms are held together by which of the following? A. hydrogen bonds B. covalent bonds C. metallic bonds D. ionic bonds

If a cube has a volume of 2cm3 and amass of 12.8 grams what is its density

The reaction is first order in cyclopropane and has a measured rate constant of k=3.36*10-5 s-1 at 720 k. if the initial cyclopropane concentration is 0.0445 m, what will the cyclopropane concentration be after 235.0 min

What is the mass number of an oxygen isotope that has nine neutrons? what is the name of this isotope?

When exposed to UV light, chlorine and hydrogen gases explosively combine to form hydrogen chloride gas. Assuming a sufficiently strong reaction vessel how much HCl (in atm) can be formed when hydrogen and chlorine are each at 5.

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum