contestada

BRAINLIESTTTT ASAP!!!!

1. Which statement is true about oxygen and rocks?

Both are mixtures.
Both are pure substances.
Oxygen is a mixture and a rock is a pure substance.
Oxygen is a pure substance and rocks are mixtures.

2. It takes 1 minute for a certain amount of potassium phosphate (KH2PO4) to dissolve in 100 grams of water at 50 °C.

Which of the following will most likely happen if the same sample of potassium phosphate is dissolved in 100 grams of water at 20 °C?

The sample will dissolve in exactly 1 minute.
The sample will dissolve in more than 1 minute.
The collision between particles of the sample will increase.
The collision between particles of the sample will remain constant.

Respuesta :

biologistkhan
answer1:
Oxygen is a pure substance and rocks are mixture.

Answer2:
The sample will dissolve in more than 1 minute, because it is hydrolysis reaction which depend upon temperaure. By decreasing temperature from 50C to 20C the reate of reaction will also decreases.

Otras preguntas