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2 years ago

7

Are two atoms of the same element identical?

2 answers:

timurjin [86]2 years ago

7 0

Answer:

No. Two atoms of the same chemical element are typically not identical Explanation:

there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states

Semenov [28]2 years ago

5 0

Answer: No

Explanation: Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.

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Which is the top layer of groundwater?

Ivanshal [37]

Answer:

An aquifer is a layer of porous substrate that contains and transmits groundwater. ... The upper level of this saturated layer of an unconfined aquifer is called the water table or phreatic surface. Below the water table, where in general all pore spaces are saturated with water, is the phreatic zone.

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3 years ago

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This is an underground level where the ground becomes saturated with water.

ozzi

Answer: Pumping can affect the level of the water table. In an aquifer, the soil and rock is saturated with water.

Explanation:

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3 years ago

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2. Platinum metal has a density of 21.4 g/mL. If the block measures 3 cm, by 0.03 m, by 40 mm

zhuklara [117]

Answer:

80mg

Explanation:

Given parameters:

Density of Platinum metal = 21.4g/mL

Dimension of the metal = 3cm by 0.03m by 40mm

Unknown:

Weight of the metal in milligrams?

Solution:

Density is the mass per unit volume of a substance.

Mathematically;

Density = $\frac{mass}{volume}$

Volume of the platinum metal = l x w x h

Let us convert the dimension of the metal to the same unit;

3cm x 0.03m x 40mm

convert to cm;

100m = 1cm

0.03m = $\frac{0.03}{100}$ = 0.0003cm

-- 40mm;

1mm = 0.1cm

40mm = 40 x 0.1 = 4cm

Volume of the metal = 3 x 0.0003 x 4 = 0.0036cm³

1mL = 1cm³; so volume = 0.0036mL

Mass of the metal = 21.4 x 0.0036 = 0.08g

1g = 1000mg

0.08g = 0.08 x 1000 = 80mg

8 0

3 years ago

Liquid octane CH3(CH2)6CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppos

valkas [14]

Answer:

88 gram is the answer in 2 significant digits

7 0

3 years ago

If given the mole fraction of water in an aqueous sucrose (C12H22O11) solution and asked to calculate the molality of the soluti

olasank [31]

Answer:

No additional information is required in order to calculate the molality of the solution.

Explanation:

Mole fraction of water = $\chi_1$

Mole fraction of sucrose = $\chi_2$

$\chi_1+\chi_2=1$

From the given mole fraction of water mole fraction of sucrose can be determined.

And from both values of mole fraction moles of water and sucrose can also be calculated.

$\chi_1=\frac{n_1}{n_1+n_2}$

$\chi_2=\frac{n_2}{n_1+n_2}$

After calculating the moles of water convert them into mass of water in grams and then change that into kilograms say that be M'.

Finally we can determine the molality of solution ;

$Molality=\frac{\text{Moles of compound}}{\text{mass of solvent (kg)}}$

Molality of the sucrose solution ;

$m=\frac{n_1}{M'}$

From this we can conclude that no additional information is required in order to calculate the molality of the solution.

7 0

3 years ago