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2 years ago

B. The student leaves the beach because a hurricane warning comes in. In a

Chemistry

1 answer:

yanalaym [24]2 years ago

8 0

Warm air is transferred from the surface to high elevations near the eye, further accelerating winds and circulation. Composed of rows of cumulonimbus clouds--big thunderstorm. They are usually the first part of the cyclone to arrive on land. Yw

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What does this graph represent? A. speed B. velocity C. acceleration D. momentum?

Llana [10]

I think that it might represent Velocity

5 0

2 years ago

Calculate the volumeof 1.0M NaOH necessary to completely neutralize 100mL of 0.50M of phosphoric acid (H3PO4)?

blondinia [14]

Answer:

50 mL

Explanation:

In case of titration , the following formula is used -

M₁V₁ = M₂V₂

where ,

M₁ = concentration of acid ,

V₁ = volume of acid ,

M₂ = concentration of base,

V₂ = volume of base .

from , the question ,

M₁ = 0.50M

V₁ = 100 mL

M₂ = 1.0M

V₂ = ?

Using the above formula , the volume of base , can be calculated as ,

M₁V₁ = M₂V₂

substituting the respective values ,

0.50M * 100 mL = 1.0M * V₂

V₂ = 50 mL

3 0

3 years ago

the grade of coal increases with (remember a higher grade of coal means it produces more energy when burned) quizlet

Aleks04 [339]

The grade of coal increases with compaction.

<h3>What is Compaction?</h3>

When something is crushed or compressed, it becomes compacted. After being collected, trash is often compressed to make it smaller and take up less room. Compaction is the process of making anything more compact, dense, or firmly packed.

grade of coal - The highest grade of coal is anthracite. It is a black, glossy, hard, brittle coal that is frequently referred to as hard coal. It has a high proportion of fixed carbon and a low proportion of volatile matter. Between subbituminous and anthracite, bituminous coal is the intermediate rank of coal.

to learn more about compaction go to -

brainly.com/question/2837181

#SPJ4

5 0

1 year ago

Determine if each compound shown is soluble or insoluble. cu(oh)2

vredina [299]

We have to determine if the given compound is soluble or insoluble in water.

The given compound is copper (II) hydroxide, $Cu(OH)_{2}$ . According to the solubility rules the hydroxides of all metal ions are insoluble except that of ammonium and the alkali metal ions. So copper(II) hydroxide will be insoluble in water. In aqueous solution, copper (II) hydroxide would exist as a sparingly soluble compound in which the undissociated compound remains in equilibrium with the ions $Cu^{2+}$ and $OH^{-}$ . The equilibrium would remain mostly towards undissociated form.

$Cu(OH)_{2}(s)Cu^{2+}(aq)+2OH^{-}(aq)$

Therefore, $Cu(OH)_{2}$ is insoluble in water.

4 0

3 years ago

Given that the formula for mass percent is mass % = mass solutemass solution100%, what will be our starting assumption when conv

attashe74 [19]

Answer:

1. The starting assumption is an amount of 100 grams of solution.

2. It simplifies the problem, because the percentage tells directly the mass of solute present in 100 grams of solution and from that point the calculations are easy to do.

Explanation:

Percentages are always based on the amount of total substance, total solution if it is the case.

If it is mass percentage the amount of total substance is mass.

For instance, a 30% mass solution of sodium chloride means 30 grams of sodium chloride (solute) in 100 grams of solution (includes the solvent plus the solute).

mass percent is mass % = (mass solute / mass solution) × 100%,

Molarity is number of moles of solute per volume in liters of solution:

Molarity = (moles solute / liters solution)

In this case, to convert from percentage to molarity you start assuming a base of 100 grams of solution. For the example of the 30% sodium chloride solution, by assuming 100 grams of solution, you had 30 grams of solute, which you can convert into moles, and, by using the density of the solution (which you need to know), you convert the 100 grams of solution into volume (in liters). Then, you can divide the number of moles of solute into the number of liters of solution, having started with the assumption of 100 grams of solution.

Molality is the number of moles of solute per kilograms of solvent.

Molality = moles solute / kg of solvent.

Again, to convert from percentage to molality, your first step is to assume a base of 100 grams of solution. Then, for the same example of 30% sodium chloride, convert 30 grams of solute to moles, and the 100 grams of solution into 70 grams of solvent (100g solution - 30 grams solute = 70 grams solvent), which is 0.070 kg. Finally, divide the moles of solute by 0.070 kg of solvent.

Then, assuming the amount of solution equal to 100 grams simplifies the problem because the percentage tells directly the amount of solute, which you can convert into moles making calculations easier than with other amount of solution.

5 0

3 years ago