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

Find the 12 mole ratios between the reactants and products for the second reaction taking place in the airbags of cars. The balanced equation for the reaction is:10Na + 2KNO3 → K2O + 5Na2O + N2

the number of joules needed to raise the temperature of 10 grams of water from 20 degrees celsius to 30 degrees celsius is

When are drops of indicator most likely added to the Erlenmeyer flask? A. when preparing the burette B. when filling the pipette with acid C. when recording the initial burette volume D. when preparing to measure pH change

Given the balanced equation representing a reaction: 2CO (g) + O2 (g) 2CO2 (g) What is the mole ratio of CO (g) to CO2 (g) in this reaction? (1) 1:1 (3) 2:1 (2) 1:2 (4) 3:2

When two compounds are made up of the same number and kind of atoms, but differ in their molecular structure they are known as?

It would take one light year to travel to the sun? True or false?

A specific, electrically neutral atom of boron has 5 protons, 5 electrons, and 6 neutrons. what is the mass number of this atom of boron? 6 5 11 16

When does hail happen?

For the reaction, calculate how many moles of the product form when 0.012 mol of O2 completely reacts. Assume that there is more than enough of the other reactant. 4Al (s) + 3O2 (g) →2Al2O3 (s) Express your answer using two significant figures.

Nuclei with too many or too few neutrons are?