Which equation obeys the law of conservation of mass? H2 (g) + O2 (g) → H2O (g) H2 (g) + O2 (g) → H2O (g) + 4He (g) 2H2 (g) + O2 (g) → 2H2O (g) H2 (g) → H2O (g) H2 (g) + O2 (g) → 2H2O (g)

What type of bonding occurs in zinc (ii) chloride, zncl2?

A KNO3 solution is made using 84.4 g of KNO3 and diluting to a total solution volume of 1.50 L. Calculate the mass percent of the solution. (Assume a density of 1.05 g/mL for the solution.)

Which of the following displacement reactions can occur? ) A) CuSO4 + Ag Cu + AgSO4 ) B) 2Ba (NO3) 2 + Zn 2Ba + Zn (NO3) 2 ) C) 2AgNO3 + Zn 2Ag + Zn (NO3) 2 ) D) MgSO4 + Zn ZnSO4 + Mg ) E) 2NaNO3 + Zn 2Na + Zn (NO3) 2

How many valence electrons are in the element nitrogen

What is the charge of a neutron? neutral negative positive

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2

How many grams of methane, CH4 are produced from the complete reaction of 5.15 moles of carbon monoxide, CO

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?