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4 years ago

14

In Florida, most of the rocks that are underground are a type of soft, white rock called limestone. If limestone is underwater f

or a long period of time, it begins to dissolve. Which of these processes most likely causes this change?

1 answer:

nadya68 [22]4 years ago

5 0

Answer:

erosion

Explanation:

eroding

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A powder sample weighing 250 g and having a surface area of 1 m2/g is dispersed in 1 L of water. After 10 minutes, 0.4 g of the

lisabon 2012 [21]

Answer:

a)

$K = 2.64 * 10^{-8}$

b)

$15 \frac{5}{8}$ hours

Explanation:

Given

Surface Area (S) of 250 grams of powder sample $= 250$ square meter.

$S = 2500000$ square centimeter

$V\frac{dC}{dT} = 0.40$ grams/minute

$V\frac{dC}{dT} = \frac{dM}{dT} = \frac{0.40*60}{10} = 0.66$ mg per second

$C_s = 0.01$ gram per cubic meter $= 10$ mg/ml

a)

$\frac{dM}{dT} = K SC_s$

$0.66 = K* 2500000* 10\\$

$K = 2.64 * 10^{-8}$ cm /sec

b) Time taken

Time taken to sink

$\frac{10*60}{0.4} * 37.5 = 56,250$

Time in hours

$15 \frac{5}{8}$ hours

6 0

3 years ago

What is one way an erupting volcano could have a global effect on ecosystems

kaheart [24]

When volcanoes erupt, they emit a mixture of gases and particles into the air. Some of them, such as ash and sulphur dioxide, have a cooling effect, because they (or the substances they cause) reflect sunlight away from the earth. Others, such as CO2, cause warming by adding to the the greenhouse effect.

5 0

4 years ago

Draw the curved arrow mechanism for the formation of an acetal from acidic methanol and 4-methylpentan-2-one in the fewest steps

morpeh [17]

Answer:

See explanation below

Explanation:

This reaction is known as Ketone hydrolisis in acid medium. This involves the formation of an hemi cetal, and then, the acetal. This is often used to convert ketones or aldehydes in ethers.

The first step involves the reaction with the acid. The carbonile reacts with the acid and forms an alcohol there. The next step is the reaction of the alcohol, in this case, the methanol to form the hemi cetal. Then in the third step, we repeat the first step, using acid to turn the OH group into a great leaving group such water. Then the water leaves the molecule, leaving the space wide open in the next step for methanol, and the acetal is formed.

See picture for the curved arrow mechanism

7 0

3 years ago

Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Note: you are writing

Bad White [126]

Answer:

Ca(OH)₂ and HCl(aq)

Explanation:

We have the products of a reaction, CaCl₂ and H₂O. Since the products are a salt and water, this is likely to be a neutralization reaction. In such a reaction, an acid and a base react to form a salt and water.

The acid provides the anion of the salt. Since the anion is Cl⁻, the acid is HCl(aq).

The base provides the cation of the salt. Since the cation is Ca²⁺, the base is Ca(OH)₂(aq).

The complete molecular equation is:

Ca(OH)₂ + 2 HCl(aq) → CaCl₂ + 2 H₂O

6 0

4 years ago

Pipettes are used when measuring the volumes of liquids with high degree of precision. The following volumes were obtained durin

never [62]

Answer:

0.075

Explanation:

First obtain the mean of the measurement;

Mean = 10.15 + 9.95 + 9.99 + 10.02/4 = 10.03

Then obtain d^2= (mean-score)^2 for each score;

(10.15-10.03)^2 = 0.0144

(9.95-10.03)^2 = 0.0064

(9.99-10.03)^2 = 0.0016

(10.02-10.03)^2= 0.0001

∑d^2= 0.0144 + 0.0064 + 0.0016 + 0.0001

∑d^2= 0.0225

Variance = ∑d^2/N = 0.0225/4 = 0.005625

Standard deviation= √0.005625

Standard deviation= 0.075

6 0

3 years ago