What r some important things in this paragraph ????

2 answers:

6 0

Keeping your arm straight in front of you, you rotate 90° to your left, and see the left side of the circle lit while the right side is dark. Half the ball is still lit up, but you can see only part of the lit area. As you continue to rotate, you see a different amount of the ball.

stich3 [128]2 years ago

3 0

You can explain how the moon changes in a pattern using models. Suppose you were standing in the dark room with a bare light bulb behind you. You hold a ball in front of you, and you can see all of the lit half of the ball, which looks like a circle. Keeping your arm straight in front of you, you rotate 90° to your left, and see the left side of the circle lit while the right side is dark. In fact, you would see the shape change from a full circle to a crescent shape to a backwards crescent shape and then back to a full circle.

Try this :)

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HELP! <br><br>How many moles of a solute would 3 liters of a 2-molar solution contain?

katrin [286]

Answer: If it was 3 mol of solute in 2 L of solution it would be 1.5 mol/L.

However when the solute dissolves in the water creating the solution, the volume increases. So 3 mol of solute in 2 L of water creates more than 2 L of solution.

The correct method for making a 3 mol/L solution would be to place some water into a two liter volume container. Dissolve all 3 mol of the solute into the water. Then add water to the 2 L mark. Now there is 3 mol of solute and 2 L of solution.

Explanation: I hope this helps XDDDD

8 0

2 years ago

A 20.0 mL sample of a NaCl solution has a mass of 21.040g. After the solution is evaporated to dryness, the dry salt residue has

Vilka [71]

Mass NaCl = 4.348
Mass solution = 21.040 - 4.348 = 16.692
mass/mass % =
4.348/16.692
= 26%
mass/vol % =
21.7%
Molecular mass of NaCl = 58.5
Moles of NaCl = 0.074
Volume of solution = 0.02 L
Molarity = 3.7 mol/Liter

7 0

3 years ago

Does it take faster for sugar or color (tint) to dissolve in water and WHY?

Ne4ueva [31]

Answer:that sugar dissolves faster in a warm liquid than in a cool

Explanation:

Molecular diffusion, often simply called diffusion, is the thermal motion of all (liquid or gas) particles at temperatures above absolute zero. The rate of this movement is a function of temperature, viscosity of the fluid and the size (mass) of the particles. Diffusion explains the net flux of molecules from a region of higher ... Diffusion of solvents,

3 0

2 years ago

Fe2O3 + 3H2 → 2Fe + 3H20

Bingel [31]

Hope this helps
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