Analysis:
Marble is made from limestone under the influence of heat and pressure. The chemical formula for limestone or marble
chips is CaCO3. When you added the chips to the acid solutions, they effervesced (bubble or foam).
1. What is the gas that is produced?
2. What is the chemical formula of the gas?
3. How could you test rocks for the presence of limestone?
4. Write a balanced symbol model for the reaction of limestone with hydrochloric acid.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic

If two atoms are bonded to a central atom with no lone pairs, how will they be arranged