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3 years ago

When a ball is rolling down a hill, what forces are acting on the ball? Why does it speed up?

Chemistry

2 answers:

Blizzard [7]3 years ago

7 0

Answer:

the gravity speed up because the friction didn't speed up

Margaret [11]3 years ago

3 0

Answer:gravity

Explanation:

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A student puts a glass of water in the freezer. Later, he notices ice forming on the surface of the water. Which property of wat

Karolina [17]

C.ice has a lower freezing point than liquid water

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3 years ago

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Water is added to liquid isopropanol (a polar liquid) to form a solution of rubbing alcohol. Describe what happens on the molecu

olya-2409 [2.1K]

Explanation:

Since liquid isopropanol is a polar liquid and water is also a polar solvent. So, when both of them are added together then according to the like dissolves like principle they get dissolved.

At the molecular level, the polar molecules of isopropanol get attracted towards the polar molecules of water at the surface of water.

As a result, water molecules get surrounded by isopropanol. Thus, water molecules enter the solution and evenly spread into the solution.

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3 years ago

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Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 5.90 moles of magnesium perchlorate, Mg(ClO4)2.

Lady bird [3.3K]

Answer:

5.90, 11.8, 47.2

Explanation:

Let’s remove the parentheses and write the formula as MgCl₂O₈.

We see that 1 mol Mg(ClO₄)₂ contains 1 mol Mg atoms, 2 mol Cl atoms, and 8 mol O atoms.

∴ $\text{Moles of Mg atoms} = \text{5.90 mol Mg(ClO}_{4})_{2} \times \frac{\text{1 mol Mg atoms}} {\text{1 mol Mg(ClO}_{4})_{2}} = \text{5.90 mol Mg atoms}$

$\text{Moles of Cl atoms} = \text{5.90 mol Mg(ClO}_{4})_{2} \times \frac{\text{2 mol Cl atoms}} {\text{1 mol Mg(ClO}_{4})_{2}} = \text{11.8 mol Cl atoms}$

$\text{Moles of O atoms} = \text{5.90 mol Mg(ClO}_{4})_{2} \times \frac{\text{8 mol O atoms}} {\text{1 mol Mg(ClO}_{4})_{2}} = \text{47.2 mol O atoms}$

∴ Mg, Cl, O = 5.90, 11.8, 47.2

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3 years ago

Comets are mixtures of frozen gases, rocks, and dust. <br><br> True or False?

Alika [10]

Hi, I am Rosy67 and im here to help.

I have read your sentence and i believe the answer is the following;

True.

Hope this could help!!!!!

~Rosy67

(PS, Can i have brainliest? Im trying to level up) :) *_*

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4 years ago

What is the mass of 14.0 mol of Ba(NO3)2?

sashaice [31]

Answer:

261.337 g/mol

Explanation:

Please mark brainliest my answer got taken down its correct

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3 years ago