The temperature of hot coffee drops upon addition of some cold milk. Is this a chemical change or a physical change

chemical

Explanation:

My opinion is that its a physical change

Explanation:

you can always add more coffee to make it hot

1 a

2 d

3 a

4 c

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.