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1 month ago

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A substance has a density of 4.5 g/cm3. The substance is heated and its density recalculated. What is the newly recorded density

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1 answer:

lions [2.9K]1 month ago

6 0

Response:

Aluminum

Clarification:

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In the partition coefficient experiment 4A this week, after thorough mixing of the reagents, phase separation will occur. The to

VMariaS [2998]

Response:

The topmost layer is the Aqueous layer, while benzoic acid resides in the oil phase or non-aqueous layer.

Clarification:

A separating funnel is an essential tool in laboratories, utilized to split the components of immiscible liquid-liquid mixtures. This method is applied during the extraction of mixture components.

The liquids will segregate into two distinct layers. This separation occurs due to the variations in density; the heavier liquid descends to the bottom whereas the lighter liquid floats on top. The liquids involved in such separation are typically dissimilar, with one being the aqueous layer and the other the non-aqueous layer.

The partition coefficient, also known as the distribution coefficient, refers to the ratio of a compound's concentration in two immiscible solvents when in equilibrium.

Organic solvents (with the exception of halogenated organic compounds) that have densities exceeding that of water, 1g/mL (commonly referred to as the oil phase), settle beneath the aqueous layer.

Benzoic acid is found at the lower phase (i.e., the bottom layer).

7 0

2 months ago

Complete the following equation of nuclear transmutation.

Alekssandra [3086]

Answer:

For the equation of nuclear transmutation, the answer is Option A. 1 0n

Explanation:

Further details on balancing the equation for the reaction presented in the question can be found in the accompanying image.

4 0

1 month ago

Approximately 220 million tires are discarded in the U.S. each year. These tires present a disposal problem because they take up

lions [2927]

Answer:

A total of 2667 tires are required to satisfy the annual power needs of ten homes.

Explanation:

According to the Second Law of Thermodynamics, not all energy produced when tires are incinerated can be effectively used due to losses associated with finite temperature differences. The energy obtainable from a tire when burned, measured in kilowatt-hours ( $E_{out}$ ), can be calculated using the efficiency definition:

$E_{out} = \eta \cdot E_{in}$

Where:

$\eta$ - Efficiency, which is dimensionless.

$E_{in}$ - Energy released from burning, measured in kilowatt-hours.

Taking into account $\eta = 0.5$ and $E_{in} = 75\,kWh$ , the yearly energy yield from a tire amounts to:

$E_{out} = 0.5\cdot (75\,kWh)$

$E_{out} = 37.5\,kWh$

Thus, the number of tires necessary to meet the electricity demand of ten homes for one year is:

$n = \frac{(10\,homes)\cdot \left(10000\,\frac{kWh}{home} \right)}{37.5\,\frac{kWh}{tire} }$

$n = 2666.667\,tires$

A total of 2667 tires are necessary to satisfy the annual power needs of ten homes.

8 0

2 months ago