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Chemistry

What is the empirical formula for a compound that is 29.44/% calcium, 23.55% sulfur, and 47.01% oxygen? This compound is a common ingredient in plaster

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Chemistry

Through which medium do sound waves travel most slowly?

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Chemistry

How are super-absorbent polymers useful in fuel filters?

a. They add water to the fuel line to dilute gas.

b. They stop excess oil from reaching the engine.

c. They repel water to protect the filter from rusting.

d. They remove harmful moisture before it reaches the engine.

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Chemistry

4. suppose you are setting up a reaction that requires an iodide salt and are planning to use sodium iodide. however, at the last minute you find that you are out of sodium iodide, so you must use potassium iodide instead. will you need to weigh out more, less, or the same mass of potassium iodide in order to get the same number of moles of iodide ions?

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Chemistry

Which of the following is a physical change of matter? A) Roasting marshmallows B) mixing kool-aid and water C) mixing alka seltzer and water D) baking a cake

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Chemistry

Calculate [OH-] for each solution.

1. pH = 13.48

Express your answer using two significant figures.

2. pH = 8.19

Express your answer using two significant figures.

3. pH = 2.12

Express your answer using two significant figures.

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Chemistry

State whether the following statements are true or false (with justification). (a) 1 mol of N2 has more molecules than 1 mol of Ar. (b) 1 mol of N2 has more mass than than 1 mol of Ar. (c) The molar mass of N2 is greater than the molar mass of Ar

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Chemistry

One year ago, you sold a put option on 100,000 euros with an expiration date of 1 year. you received a premium on the put option of $0.04 per unit. the exercise price was $1.22. assume that 1 year ago the spot rate of the euro was $1.20, the 1-year forward rate exhibited a discount of 2 percent, and the 1-year futures price was the same as the 1-year forward rate. from 1 year ago to today, the euro depreciated against the dollar by 4 percent. today the put option will be exercised (if it is feasible for the buyer to do so).

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Chemistry

Calculate the product of 0.0002115m and 0.0000405m. Express the answer in scientific notation

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Chemistry

How do the different spheres of Earth interact? Volcanic eruptions are natural phenomena in the. They sometimes erupt, spilling out lava and dust. The lava solidifies, forming new landmasses. Volcanoes can have an effect on the when plants and animals are threatened by an eruption. Volcanic ash and gas can also pollute the, resulting in acid rain and other unfavorable weather patterns.

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Chemistry

Differentiate between mass, volume, and density. Explain why only changing the shape of an object would have no effect on its density.

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Chemistry

Describe the properties of noble gases. Based on their electronic arrangement, explain whether they can exist alone in nature.

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Chemistry

In the reaction 2k + 2h2o → 2koh + h2, which compound has an element ratio of 2 : 1? h2o h2 k koh

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Chemistry

Describe with sketches how electrons are transferred during ionic bonding for: (a) Lithium Bromide (LiBr) (b) Potassium Bromide (KBr) (c) Lithium Chloride (LICI)

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Chemistry

Write the Ka expression for an aqueous solution of hydrofluoric acid: (Note that either the numerator or denominator may contain more than one chemical species. Enter the complete numerator in the top box and the complete denominator in the bottom box. Remember to write the hydronium ion out as, and not as) Ka

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