Which equations are balanced? Check all that apply.

Mg3N2 + H2O → 3MgO + 2NH3

C3H8 + 5O2 → 4H2O + 3CO2

Zn + 2HCl → ZnCl2 + H2

3Ca (OH) 2 + 2H3PO4 → Ca3 (PO4) 2 + 6H2O

3H2SO4 + 2Fe → Fe2 (SO4) 3 + H2

4Al + 3O2 → 2Al2O3

Ryan is examining the energy of the particles in a bar of gold. What is Ryan most likely studying? thermal energy electric energy potential energy internal energy

What causes a solar nebula to initially bring to form a solar system

You are standing 1 meter from a squawking parrot. If you move to a distance three meters away, the sound intensity will be what fraction of its original value?

What happens to the frequency of an EM wave as the wavelength shortens?

If one bullet is dropped from a certain height and another is fired from a gun horizontally from the same height which one will hit the ground first or will they hit at the same time?

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines

Which of the following statements concerning Howard Gardner's multiple intelligences is not correct? A. Gardner is not interested in assessing levels of intelligence. B. Gardner has based his theory on research in various areas of psychology. C.

The force of attraction between two oppositely charged pith balls is 5.3 * 10-6 newtons. If the charge on the two objects is 6.7 * 10-9 coulombs, what is the distance between the two charges? (k = 9.0 * 109 newton·meter2/coulombs2)

To describe velocity you need to know?

Mohammed made a chart to list examples and nonexamples of projectile motion. Which best completes the chart? a - a football thrown in the airb - a kite flying on a stringc - a golf ball rolling off a table d - water spraying from a fountain