Chemical change? Need more context.
Quick answer: Exothermic reactions mean that heat has escaped the system. The answer is A. Heat is released.
The correct answer is 7 I just took the test :)
Answer:
The calcium concentration must be greater outside the cell than inside the cell.
Explanation:
My previous answer was deleted from the explanation I provided from another website.
Chemicals cancel each other out and produce a salt and water. A neutralization reaction my also occur