Plz answer 2 questions i will mark the brainlest and you will have more points

1: when is seawater the densest?

2: noah created a model of a glacier to explain how glaciers change the surface of earth. he froze two large blocks of ice. one block was pure water. the other was water mixed with sand and rocks. if noah rubs each block across a piece of tin foil to demonstrate the glacial movement, how will the blocks most likely behave?

a
the pure block will run smoothly across the foil, while the sand and rock filled block will make scratches and rips in the foil.

b
the pure block will make scratches and rips in the foil, while the sand and rock filled block will run smoothly across the foil.

c
both blocks will slide smoothly along the foil, leaving trails of water behind.

d
both blocks will scratch and rip the foil, carrying pieces of foil along their path.

Suppose that recording station n is located 200 km north of the epicenter of an earthquake, and recording station s is located 100 km south of the epicenter of the same earthquake. which of the following statements would be true?

1. how much energy is needed to raise the temperature of 40.0 g of argon from 25c to 40c? the specific heat capacity of argon is 0.520 j/(g·k) 2a. 23.0 ml of 0.100 m hcl (standard) are added from a buret to neutralize 50.0 ml of an unknown basic solution. 2b. if the oh- produced in the previous reaction came from ca(oh)2, then what is the molarity of the ca(oh)2? 3.calculate the new freezing-point of a solution when 60.5 grams of cacl2 solute is dissolved in 0.612 kg of water. 4. what is the maximum number of moles of alcl3 that can be produced from 5.0 mol al and 6.0 mol cl2? 5. a sample of oxygen gas has a volume of 150 ml when its pressure is 0.923 atm. if the pressure is increased to 0.987 atm and the temperature remains constant, what will the new volume be? 6. nitrogen gas in a closed container at a temperature of 100.0 oc and 3.0 atm is heated to 300 oc. what is the pressure of the gas at the higher temperature?

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.