15.3 of an unknown substance was found to contain 0.15 moles. Calculate the relative formula mass of the substance.

Two people must have the same speed and velocity if A) they are walking toward each other at 2 m/s. B) they are walking away from each other at 2 m/s. C) they are jogging side by side at 5 m/s. D) they are jogging to two different destinations.

How many atoms of nickel can be found in a 1.00 g sample?

Even though the neighborhood shown by the green star was not next to any of these fires, how was the neighborhood affected by them? A) The heat generated by these fires made the temperatures in the surrounding areas increase.

When 3.5 mol Al react with 12.5 mol HCl, what is the limiting reactant and how many moles of H2 can be formed? 2Al + 6HCl yields 2AlCl3 + 3H2

How can you make a solution saturated

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?