Consider the following chemical reaction: 4 Al(s) + 3 O2(g) ⟶2 Al2O3(s)

If 4.2 grams of Al reacts with 3.0 grams of O2,

1. How many grams of Al2O3 could be produced?

2. Which reactant is limiting?

3. Which reactant is excess?

4. How much of the excess reactant would remain?

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.