Which statement is true about elements?

They are finite in number.

They are infinite in number.

They combine to form atoms.

They combine to form electrons.

Calculate the enthalpy change for the reaction Ca (s) + N2 (g) + 3O2 (g) ⟶Ca (NO3) 2 (s) from the following equations: 8Ca (s) + Ca (NO3) 2 (s) →Ca3N2 (s) + 6CaO (s) ΔH = - 3304 kJ Ca3N2 (s) ⟶3Ca (s) + N2 (g) ΔH =

The product of a number and 3 is the same as the sum of that number and six

What is the significance of the fact that the droplets carried different charges?

Suppose a vodka martini contains 30% alcohol with the remaining portion of the drink composed of water. what is the solute in this type of martini?

Why is molding a clay bowl a physical change?

Using the field meter, does the field strength increase or decrease as you move away from the bar magnet?

Complete each of the definitions with the appropriate phrase. Precision means that measurements are close to Accuracy means that measurements are close to Anawer Bank each other an accepted value |individual several

Acetylene is hydrogenated to form ethane. the feed to the reactor contains 1.4 mol h2/mol c2h2. (find properties of the reactants/products in appendix of book) a.

Several properties of the element magnesium are shown. Which one is a chemical property?

How does the quantity of atp produced as a result of activity by the electron transport chain compare to the quantity produced as a result of glycolysis?