q20. what happens when you mix cold water and warm water? *\nthey begin to mix immediately\ncold water rises…

q20. what happens when you mix cold water and warm water? *\nthey begin to mix immediately\ncold water rises before they mix\nwarm water rises before they mix\ncold water will push the warm water to the bottom\nq21. you measured the mass of an empty graduated cylinder using a balance, and it was 22.5 grams. and then you poured a liquid in the graduated cylinder, and the mass became 26.7 grams. how do you calculate the mass of the liquid?\n22.5 multiply by 26.7

q20. what happens when you mix cold water and warm water? *\nthey begin to mix immediately\ncold water rises before they mix\nwarm water rises before they mix\ncold water will push the warm water to the bottom\nq21. you measured the mass of an empty graduated cylinder using a balance, and it was 22.5 grams. and then you poured a liquid in the graduated cylinder, and the mass became 26.7 grams. how do you calculate the mass of the liquid?\n22.5 multiply by 26.7

Answer

Q20

Brief Explanations:

Warm water is less dense than cold water. Less - dense substances rise in a fluid medium. So warm water rises before they mix.

Answer:

C. Warm water rises before they mix

Q21

Explanation:

Step1: Identify the principle

The mass of the liquid is the total mass (cylinder + liquid) minus the mass of the empty cylinder.

Step2: Substitute values

Let $m_{empty}=22.5$ g and $m_{total}=26.7$ g. The mass of the liquid $m = m_{total}-m_{empty}$. $m=26.7 - 22.5$

Answer:

Subtract 22.5 from 26.7