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3 years ago

4. What is the rarest element that is natural to earth?

Chemistry

2 answers:

krek1111 [17]3 years ago

5 0

Astatine it’s also a chemical element

never [62]3 years ago

3 0

Answer:

Astatine

Explanation:

Astatine is a chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements.

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The main reason why water is often referred to as a 'universal solvent' is because:

harina [27]

This helped me for notes so much!!

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4 years ago

Read 2 more answers

5.6 g of solid CO2 is put in an empty sealed 4.00 L container at a temperature of

tresset_1 [31]

Answer:

0.78 atm

Explanation:

Step 1:

Data obtained from the question. This includes:

Mass of CO2 = 5.6g

Volume (V) = 4L

Temperature (T) =300K

Pressure (P) =?

Step 2:

Determination of the number of mole of CO2.

This is illustrated below:

Mass of CO2 = 5.6g

Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol

Number of mole CO2 =?

Number of mole = Mass/Molar Mass

Number of mole of CO2 = 5.6/44

Number of mole of CO2 = 0.127 mole

Step 3:

Determination of the pressure in the container.

The pressure in the container can be obtained by applying the ideal gas equation as follow:

PV = nRT

The gas constant (R) = 0.082atm.L/Kmol

The number of mole (n) = 0.127 mole

P x 4 = 0.127 x 0.082 x 300

Divide both side by 4

P = (0.127 x 0.082 x 300) /4

P = 0.78 atm

Therefore, the pressure in the container is

3 0

4 years ago

Observe the concentrations of the hydronium ions(H3O+), hydroxide ions(OH-), and water (H2O) in the “Water Components” chart on

tia_tia [17]

FOLLOWING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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3 years ago

How much work is done by a 35-watt light bulb if it is on for 1,320 seconds?

OleMash [197]

Answer:

The 35-watt light bulb does a work of 46200 joules in 1320 seconds.

Explanation:

From Physics we remember the definition of work ( $W$ ), measured in joules, by the following integral equation:

$W = \int\limits_{0}^{t} {\dot W} \, dt$ (1)

Where $\dot W$ is the power, measured in watts.

If the power is stable in time, then the work can be calculated by the following algebraic equation:

$W = \dot{W}\cdot \Delta t$ (2)

If we know that $\dot W = 35\,W$ and $\Delta t = 1320\,s$ , then the work done by the 35-light bulb is:

$W = (35\,W)\cdot (1320\,s)$

$W = 46200\,J$

The 35-watt light bulb does a work of 46200 joules in 1320 seconds.

8 0

3 years ago

A saturated solution of Al(OH)3 has a molar solubility of2.9x J0-9 Mat a certain temperature. What is the solubility product con

Viktor [21]

The solubility product constant, Ksp, of the aluminum hydroxide, Al(OH)₃ at the temperature is 1.91×10¯³⁹

<h3>What is solubility of product? </h3>

The solubility of product (Ksp) is defined as the concentration of products raised to their coefficient coefficients. This is illustrated below:

mA <=> nC + eD

Ksp = [C]^n × [D]^e

With the above information in mind, we can obtain the solubility of the product. This is illustrated below:

<h3>Dissociation equation </h3>

Al(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)

From the balanced equation above,

1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯

<h3>How to determine the concentration of Al³⁺ and OH¯</h3>

From the balanced equation above,

1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯

Therefore,

2.9×10¯⁹ M Al(OH)₃ will also contain

1 × 2.9×10¯⁹ = 2.9×10¯⁹ M Al³⁺
3 × 2.9×10¯⁹ = 8.7×10¯⁹ M OH¯

<h3>How to determine the solubility of product </h3>

Concentration of Al³⁺ = 2.9×10¯⁹ M

Concentration of OH¯ = 8.7×10¯⁹ M

Solubility product (Ksp) =?

Al(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)

Ksp = [Al³⁺] × [OH¯]³

Ksp = 2.9×10¯⁹ × (8.7×10¯⁹)³

Ksp = 1.91×10¯³⁹

Learn more about solubility of product:

brainly.com/question/4530083

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5 0

3 years ago