Lessons 12.1 & 12.2

a 100.0 g block of iron at 37^oC

30.0 mL of water at 52^oC

350 mL of 6.0 M HCl at 25^oC

5.5 L of krypton gas at 19^oC and 1085 torr

Heat will flow from the concrete to the ice because concrete is a better conductor of heat

Heat will flow from the ice to the concrete because ice is at a lower temperature

Heat will flow from the concrete to the ice because concrete is at a higher temperature

Heat will flow from the ice to the concrete because the ice has a much lower mass

q_sys is a positive value and q_surr is a positive value

q_sys is a positive value and q_surr is a negative value

q_sys is a negative value and q_surr is a positive value

q_sys is a negative value and q_surr is a negative value

Heat transfers from the metal to the water until both the metal and water equal 100°C.

Heat transfers from the water to the metal until both the metal and water equal 100°C.

Heat transfers from the metal to the water until their temperatures end up equal between 80°C and 100°C.

Heat transfers from the water to the metal until their temperatures end up equal between 80°C and 100°C.

The test tube becomes hot as heat is released.

The test tube becomes hot as heat is absorbed.   

The test tube becomes cold as heat is released.

The test tube becomes cold as heat is absorbed.

endothermic

exothermic

CO₂ + H₂O + 275.2 kJ --> H₂CO₃

CO₂ + H₂O --> H₂CO₃ + 275.2 kJ

CO₂ + H₂O - 275.2 kJ --> H₂CO₃

CO₂ + H₂O --> H₂CO₃ - 275.2 kJ