How did early chemists determine which substances were elements?

a. by observing chemical reactions

b. by finding the atomic mass

c. by counting neutrons

d. by counting protons

Kinetic energy and gravitational potential energy are both forms of which type of energy

How hot can the earth possibly get?

How many moles of nitrogen gas are in a 10.0 L container at STP? a. 0.45 moles b. 22.4 moles c. 10.0 moles d. 6.02 x 1023 moles

Which kind of bonds are found in a sample

What is the best type of graph to track the change in sales for your store from month to month? line graph bar graph pictograph pie chart

What will an atom do if it has 1 to 3 valence electrons

What is milk best described as? solution, suspension, compound, or colloid?

In any chemical reaction, the quantities that are conserved are ... A. mass and moles. B. the number of molecules and the volumes. C. the number of moles and the volumes. D. mass and number of atoms.

How many neutrons does element X have if its atomic number is 39 and its mass number is 75?

Enter a chemical equation for LiOH (aq) LiOH (aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation.