PLS HELP I am stuck THESE ARE ALL MY POINTS! A group of students were asked to layer four solutions that were made with water and the same dissolved solid. They recorded data in the table below to describe the volume and mass of each solution. What is the density of EACH of the solutions in the chart? Use the chart to answer questions 1-4. You can use a calculator.

1. What is the density of solution A? *
1 point
2. What is the density of solution B? *
1 point
3. What is the density of solution C? *
1 point
4. What is the density of solution D? *
1 point
5. If you were to layer these solutions in a straw (as you did in class), in what order would you put them in the straw so they wouldn’t mix immediately? *
1 point
6. You have been developing a particle model of fluids and what happens when thermal energy is added or removed. When thermal energy is added to a fluid, . Check ALL the states that apply. *
2 points
the motion of the particles speeds up
the particles in the fluid move farther apart
there are fewer collisions among the particles
the particles increase in size
A group of students are investigating what happens when you put different temperatures of water together. In this investigation, they have set up a vial of colorless room-temperature water and are adding purple hot water at the bottom of the vial, using a pipette. Answer the questions from 7 to 8.

7. What do you predict happens in the first 5 seconds? (Mark the one best answer.) *
1 point
The hot water stays at the bottom of the vial.
The hot water mixes all through the vial.
The hot water moves toward the top of the room-temperature water.
The hot water mixes with the bottom half only of the room-temperature water.
8. Which explanation best describes why this happens? (Mark the one best answer.) *
1 point
Hot water is more dense than room-temperature water.
Water immediately mixes because energy transfers between particles.
Water expands when it is heated, so it is less dense.
Water weighs less when it is hot, so it sinks.
A group of students wanted to test their understanding of convection. They thought if they set up the chamber in a new way and could predict what happens, that would show that they understand the phenomenon. Here’s how they set up the new chamber: they put the candle in the middle and ice on top of the chamber on both sides. (The rectangle in all the photos = a block of ice.) Each student in the group drew a model predicting what the convection current would look like. Answer questions from 9 to 10.
9. Mark the student’s model that you think shows the best prediction. (Mark the one best answer.) *
1 point

A

B

C

D
10. Explain your reasoning. Why did you choose that model? *
1 point
11. A group of students opens several windows to cool off their classroom. After a few minutes, they close the windows. They measure the temperature, and it is 5°C cooler than it was before they opened the windows. Which statement below best explains why that happened? (Mark the one best answer.) *
1 point
The outside air added cold to the air in the room.
The air particles in the room transferred kinetic energy to the air particles from outside.
The air particles mixed so now all the air particles have less kinetic energy.
The outside air particles added kinetic energy to the air particles in the room.
12. Picture yourself sitting on a beach on a very warm day. The temperature of the air above the sand is about 10°C warmer than the air above the water. Check ALL the correct answers. *
2 points
The air above the water is denser than the air above the sand.
The air particles above the water have more kinetic energy than the air particles above the sand.
Water and air are both uids; sand is a solid.
The breeze is blowing from a higher-pressure area to a lower-pressure area.
Air rises above the sand because the air particles are lighter.