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Olin [163]
4 years ago
13

The term "________" refers to a group of elements called lanthanides and actinides that are not often found in large, commercial

ly valuable quantities.A) special earthsB) restricted mineralsC) rare earthsD) earth obscuresE) nonelastic minerals
Chemistry
1 answer:
Hoochie [10]4 years ago
3 0

Answer:

C rare earths

Explanation:

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A sample of Strontium-90 is found to have decayed to one-fourth of its original amount after 58.2 years. What is the half-life o
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The half-life of strontium-90 is 28.8 years.
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Compound A, an alkyl bromide with chemical formula , reacts with to yield compound B. Compound B in turn reacts with (1) , (2) ,
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Compound B will be propene as a result of an elimination reaction involving potassium tert-butoxide and an alkyl halide. In proton NMR, alkenes exhibit signals in the 5–6 ppm range.

<h3>What are Elimination Reactions?</h3>

Elimination reactions are one sort of reaction that are mostly utilized to convert saturated compounds (organic molecules that contain single carbon-carbon bonds) to unsaturated compounds (compounds that feature double or triple carbon-carbon bonds). Additionally, it plays a significant role in the production of alkenes.

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5 0
2 years ago
Calculate the molarity (M) of a solution containing 49.0 grams of H3PO4 in 500 mL of solution.
vlada-n [284]

Answer

The molarity (M) of the H3PO4 solution = 1.0 M

Explanation

Given:

Mass of H3PO4 = 49.0 grams

Volume of the solution = 500 mL = 500/1000 = 0.5 L

What to find:

The molarity (M) of the H3PO4 solution.

Step-by-step solution:

Step 1: Convert 49.0 grams H3PO4 to moles using the mole formula.

Mole=\frac{Mass}{Molar\text{ }mass}

The molar mass of H3PO4 = 97.994 g/mol

So,

Mole=\frac{49.0\text{ }g}{97.994\text{ }g\text{/}mol}=0.50\text{ }mol

Step 2: Calculate the molarity of the solution using the molarity formula.

Molarity=\frac{Mole}{Volume\text{ }in\text{ }L}

Putting mole = 0.50 mol and volume = 0.50L into the formula, we have;

Molarity=\frac{0.50mol}{0.50L}=1.0\text{ }M

The molarity (M) of the H3PO4 solution = 1.0 M

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1 year ago
Find the volume of a cereal box that has the dimensions of 35.2 cm x 220 cm x 6.0 cm
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Answer:

Volume = 35.2×220×6.0 = 46464 centimeters³

Explanation:

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3 years ago
An increase in mass will​
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Answer:

As an object increases in speed, so does the amount of energy that it has, this energy is what we refer to as 'the increase in mass'

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