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3 years ago

Please help me out!

Chemistry

1 answer:

meriva3 years ago

7 0

The Index Fossil Correlation, the other 2 are generally used for radioactive decay

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If a block has a density of 1.8 g/ml, will it float?

Natali [406]

Answer:

No it won't.

Explanation:<em> </em>If GREATER than 1 g/cm3, it will SINK in water.

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4 years ago

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benzoic acid and naphthalene was dissolved in tert-butyl methyl ether and the resulting solution was extracted with aqueous sodi

devlian [24]

Answer:

Explanation:

Sodium benzoate forms when benzoic acid reacts with sodium bicarbonate. Since benzoic acid is readily soluble in ether than water, the salt of benzoic is more soluble in water than in ether because it is ionic and very polar. water which is the lower layer will contain sodium benzoate.

After separating the lower layer, if acidified with Hcl,benzoic acid will be regenerated, it precipitates out as a result of its low solubility in water.

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4 years ago

Which statement describes a chemical change?. 1 alcohol evaporates. 2. water vapor forms snowflakes. 3. table salt is crushed in

bixtya [17]

<span>(4) a chemical change results in the formation of new chemical substances, breaking and creating bonds between atoms. (4) is the only option were you end with different chemical substances (carbon dioxide and water) to what you started with (glucose and oxygen).</span>

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3 years ago

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Assume the alveolar radii are 0.05 and 0.07 mm towards the end of exhalation. Knowing that air flows from high to low pressures,

xeze [42]

Answer:

$0.286 mN/m^2$

Explanation:

Using Laplace's law of surface tension:

$P=\frac{2T}{r}$

where:

P = pressure

T = surface tension

r = radius

In the longer alveoli with radius of 0.07 mm = $0.07*10^{-2}m$ ; we have:

P = $\frac{2*25mN/m}{0.07*10^{-2}m}$

P = $0.714 mN/m^2$

In the smaller alveoli with radius 0.05 mm = $0.05 * 10^{-2} m$ ; we have:

P = $\frac{2*25mN/m}{0.05*10^-2m}$

P = $1.00 mN/m^2$

The pressure difference can now be calculate as follows:

Pressure difference = $(1.00 - 0.714)mN/m^2$

Pressure difference = $0.286 mN/m^2$

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3 years ago

At a certain temperature, 0.980 mol SO₃ is placed in a 2.50 L container.

taurus [48]

Answer:

Kc = 0.0122

Explanation:

For a given equilibrium reaction, the equilibrium constant is calculated by taking the ratio between the equilibrium concentrations of the products and the equilibrium concentrations of the reactants, each raised to the power of their respective stoichiometric coefficients.

6 0

3 years ago