Which of the following substances are homogenous and which are heterogeneous: blood, carbon dioxide, solid carbon dioxide, rock, steak, iron, rust, concrete, air, oxygen, salt, milk?

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?