Galena is an important economic mineral for which of the following? Question 7 options: lead gold platinum zinc

When a solid compound is formed from chemicals that are in solution, it is called a?

The nose is an organ that acts as an airway for oxygen to enter the body. The nose also contains hairs that trap small foreign objects and stop them from entering the body. Which two systems does the nose play a role in? A. respiratory and immune B.

The volumetric flow rate of aniline is 1500 cm/min. What is the mass flow rate in g/sec? What is the molar flow rate in kmol/min? (2) The volumetric flow rate of a 4M ammonium nitrate aqueous solution is 450 m/hr.

If an electron is gained the atom has what kind of charge

How long does it take for Earth to rotate one time on its axis?

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?