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2 years ago

Which of the following is an example of chemical weathering?

Chemistry

2 answers:

Xelga [282]2 years ago

8 0

Answer:

the answer is C acid dissolving limestone

Explanation:

The chemicals in the water break down the rocks, so water breaking rocks is an example of chemical weathering :) Also, acids are a form of chemical weathering, as the chemicals dissolve the limestone :) Hope this helped!!

REY [17]2 years ago

6 0

Answer:

the answer is C acid dissolving limestone

Explanation:

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A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

Brut [27]

Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

$K_f$ = freezing point constant = $3.96^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

$7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}$

$x=1.0\times 10^2g$

Thus $1.0\times 10^2g$ urea was dissolved.

8 0

3 years ago

A dry mixture of KNO3 and sand could be separated by

Tatiana [17]

Place the mixture in hot water and stir well.
The KNO3 is very soluble in hot water. 
Use a fine filter paper and filter off the sand. 
The sand will be separated from the KNO3 solution. 
The water can now be evaporated from the solution by further, gentle heating leaving the solid in the container.

7 0

2 years ago

A period of the periodic table ends with the highest energy level of an element's ators having?"

andrey2020 [161]

Answer:

the last period. i think has the largest energy level

Explanation:

7 0

2 years ago

Borax (na2b4o7Â·10h2o; fw = 381.372 g/mol; density = 1.73 g/ml), a primary standard, was used to standardize a solution of hno3.

SashulF [63]

0.06355391 mol The balanced equation for the reaction is Na2B4O7*10H2O + 2 HNO3 = 2 NaNO3 + 4 H3BO3 + 5 H2O So for each mole of Borax to neutralize, it takes 2 moles of HNO3. Calculate number of moles of Borax 0.2619 g / 381.372 g/mol = 0.0006867 mol Moles of HNO3 used = 0.0006867 mol * 2 = 0.0013734 mol Molarity is defined as moles per liter so divide the number of moles used by the volume in liters. So 0.0013734 / 0.02161 = 0.06355391 mol

3 0

3 years ago

How many grams are in 2 moles of copper

alisha [4.7K]

Answer:

In 2 moles of copper, there are 319.2172 grams.

Explanation:

Quick conversion chart of moles Copper(II) Sulfate to grams 1 moles Copper(II) Sulfate to grams = 159.6086 grams 2 moles Copper(II) Sulfate to grams = 319.2172 grams

7 0

2 years ago