Calculate the Mr of CO2 and use it to calculate the mass of CO2 produced when 1 kg (1000 g) of CaCO3 is heated.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.