Given the unbalanced equation: Al + O2 → Al2O3

When this equation is completely balanced using smallest whole numbers, what is the sum of the coefficients?

1.

9

2.

7

3.

5

4.

4

The specific heat of a certain type of metal is 0.128J / (g.°C). What is the final temperature if 305 J of hear is added to 28.8 g of this metal, initially at 20.0°C?

Explain how Dmitri Mendeleev arranged his periodic table. How was he able to make predictions about the blanks that he left in the table?

Propane and oxygen react according to the equation: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g). How many grams of water can be produced from the complete combustion of 2.0 moles of C₃H₈ (g) ? a. 144.0 b. 82.0 c. 8.0 d. 44.8 e. 22.4

What is the Bohr model for beryllium

Why are hypothesis valuable even if it's not supported by data

Which molecule has a nonpolar covalent bond?

What is the net ionic equation of the reaction of mgso4 with bacl2? express your answer as a chemical equation?

Which statement is true about this reaction? Superscript 14 subscript 7 upper N plus superscript 1 subscript 1 upper H right arrow superscript 15 subscript 8 upper O. It is a practical source of energy on Earth.

Classify each substance as either a mixture or a pure substance. Chlorine water air brass coffee olive oil copper

How many moles of HBr are present in 250 ml of a 0.15 M HBr solution?