Hydrogen is 99% H-1, 0.8% H-2, and 0.2 H-3. calculate its average atomic mass

The total bonding energy for the products of a reaction is 2535 kJ/mol and the bonding energy of the reactants is 1375 kJ/mol. Calculate the change in enthalpy, and classify the reaction as endothermic or exothermic.

Which is not a characteristic of most nonmetals? Their atoms lose electrons when bonding with metal atoms. Their atoms gain electrons when bonding with metal atoms. Their atoms share electrons with other nonmetal atoms.

Is it possible for the properties of a substance with a specific type of bond to vary

Carbon and its occurrence

True or false? Even when soil is saturated with water, water is still available in small spaces.

23.9 km + 15 km Calculate this problem and report the answer with the correct number of significant figure

An atom of element A has 108 protons. What would the elements atomic number be?

What is a scientific variable

What kind of reactions are redox reactions a. reactions involving substituting different isotopes b. reactions involving losing and gaining electrons c. reactions involving protons transferring between atoms d.

Determine the number of atoms in 1.75 ml of mercury. (the density of mercury is 13.5 g/ml.)