The following chemicals were combined: Zinc + Hydrochloric Acid - Zinc Chloride and Hydrogen Gas Zn + 2HCI - ZnCl2 + H2 Explain why it is necessary to place a "2" in front of HCl in the reactants in the chemical equation. Use evidence and scientific reasoning to support your answer

Is powdered sports drink ionic or covalent ? 10pts !

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]