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

A car accelerates uniformly from rest for a time of 12 sec. The rate of acceleration is 4m/s^2. What is the velocity at the. end of 12 sec?

Newton's heliocentric view of the universe meant that the sun was the center of the universe. True False

Microchips have between 50 and 100 transistors on them True False

So, like my previous question, how do you solve for 4/5 - 1/2?

What theory did dalton propose about the structure of matter

Salt water has greater density than fresh water. A boat floats in both fresh water and in salt 12) water. Where is the buoyant force greater on the boat?

A 1000-kg space probe is motionless in space. to start moving, its main engine is fired for 5 s during which time it ejects exhaust gases at 5000 m/s. at the end of this process it is moving at 20 m/s. the approximate mass of the ejected gas is:

In the fishbowl, the glass, water, rocks, and plastic plants are in thermal equilibrium. This situation means the temperature of the rocks is? F. If the water is 75 degrees

An archer shoots an arrow at a 75.0 m distant target; the bullâs-eye of the target is at same height as the release height of the arrow. (a) at what angle must the arrow be released to hit the bullâs-eye if its initial speed is 35.

Which of the following is considered a contact forces?1) the force between two magnets. 2) the gravitational pull of a planet. 3) friction between an object and air. 4) the force between two charged particles.