describe how you would separate a mixture of water sand pebbles and paper clips

Final answer:

Calcium and sulfur combine to form the ionic compound calcium sulfide, written as CaS, due to the metal calcium cation combining with the nonmetal sulfur anion to balance the charges.

Explanation:

A compound consisting of calcium and sulfur forms an ionic compound. Calcium is a group 2 element and forms a calcium cation (Ca2+), while sulfur is a group 16 element and forms a sulfide anion (S2-). In an ionic compound, the total charge of the cations and anions must be equal. Therefore, one calcium ion will combine with one sulfur ion to form the compound calcium sulfide, which is written as CaS. This compound is ionic because it consists of a metal (calcium) and a nonmetal (sulfur) element.

Answer:

Pyrite is a network substance.

Explanation:

I just know.

Answer:

For plato users:

Pyrite is a Network Substance

Explanation:

Answer:

The percentage yield of magnessium is 19.231 %

Explanation:

The magnesium from sea water is added to Ca(OH)2 to precipitate Mg(OH)2. This magnesium hydroxide is then reacted with HCl as follows ;

Mg(OH)2 + 2HCl → MgCl2 + 2H2O

molar mass of MgCl2 = 24.305 + 35.453 × 2 =  24. 305 + 70.906 = 95.211 g

The equation is balanced now . And 1 mole or 95.11 g of MgCl2 was produced . The magnesium chloride was electrolyzed   to produce Mg and Cl2.

The total mass of MgCl2 obtained = 962 grams

mass of the Mg obtained  = 185 grams

The percentage yield for the magnesium  = 185 / 962 × 100 = 18500/962

The percentage yield for the magnesium  = 185 / 962 × 100 = 19.231 %

The percentage yield of magnessium is 19.231 %

You would use Chromatography. I hope that this answer helps :)

Fossils are the preserved remaining, impressions or traces of prehistoric organisms.

Trace fossils are the naturally preserved evidence of animal activity like footprints of animals.

Body fossils are formed from the remaining of dead animals and plants like bones, teeth etc.

Bone fossils are the remaining of bones.

Cast fossils are formed by hardening of mud or sand that is filled in the mold and thus gives the shape of the organism

Thus, option D that is cast fossils record the shape and structures of an organism.

The 15.0 kg chunk of ice, falling 8.00 meters, hits the water with a velocity of approximately 12.52 m/s and has kinetic energy of about 1176 joules.

To determine the kinetic energy and velocity of a 15.0 kg chunk of ice falling from a height of 8.00 meters, we can use the principles of physics.

Velocity Calculation:

We use the formula for the final velocity of a freely falling object:

v = √(2gh)

where:

Substitute the values:

v = √(2 * 9.8 m/s2 * 8.00 m) = √(156.8) ≈ 12.52 m/s

Kinetic Energy Calculation:

The kinetic energy (KE) can be calculated using the formula:

KE = 0.5 * m * v2

where:

Substitute the values:

KE = 0.5 * 15.0 kg * (12.52 m/s)2 = 0.5 * 15.0 * 156.8 ≈ 1176 J

So, the chunk of ice has a kinetic energy of approximately 1176 joules and a velocity of 12.52 m/s upon hitting the water.

Answer:

Strongly acidic

Explanation:

pH scale test for the alkalinity and acidity level of a particular substance. The pH scale range from 0 - 14. The lower the pH value the higher the acidity contents while the higher the pH value the higher the alkalinity.

pH values of 1 - 3 depict strongly acidic contents as the value increases the acidity content reduces . Usually a pH value of 7 depicts neutrality. That is it is neither acidic nor alkaline. pH value higher than 7 is heading towards alkalinity.

Acidic content contains the hydrogen ion(H+)  while the alkaline content contains the hydroxide ions(OH-).  The combination of this ions, forms water molecule(H2O).

The work done on the wheelbarrow is 6000 Joules, and the power required to do this work in 10 seconds is 600 Watts.

The question asks about the concepts of work, force, and power in a real-world situation. In this case, we can use the equation for work, which is Work = Force x Distance. Given that the force is 200N and the distance is 30m, then by multiplying these two, the work done on the wheelbarrow is 6000 Joules.

Power, on the other hand, is the rate at which work is done. It is computed as Work Done ÷ Time Taken. If the work done is 6000 Joules and it takes 10 seconds, the power required would be 600J/sec or 600W (Watts).

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Transpiration is the process of release of water from the plants. In the absence of transpiration, the plant bursts. Thus, option D is correct.

The transpiration process is the release of water from the plants through stomata. The pressure of water allows the movement of the stomatal guard cell, and the stomata opens.

The opening of stomata releases the water inside the plants, and release of pressure results in the relaxation of stomata, thereby closing the stomata.

The absence of transpiration in plants results in the accumulation of water inside the body. The access water in the body exerts the force to the plant body, and it may burst.

Therefore, in the condition of loss of transpiration by the plants, the plant may burst out. Thus, option D is correct.

Learn more about transpiration, here:

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If white light shines on an object and all colors except yellow are absorbed, the object will appear yellow. This is because the object reflects the yellow light and our brain processes this to determine the object's color.

When white light shines on an object and red, orange, green, blue, indigo, and violet light is absorbed, the color your eye will see is the one that is not absorbed—in this case, yellow. This phenomenon occurs because the object is reflecting the yellow light while absorbing all the other colors. The mixture of light frequencies that enter our eyes is processed by the brain, allowing us to perceive the color of objects based on which light waves are reflected and which are absorbed.

White light is composed of all the colors of the visible spectrum. If an object absorbs all colors except one, the color reflected by the object is the color we perceive. In our example, since all colors except yellow are absorbed, the objects appears yellow. This is a direct result of the complementary colors concept, as our eyes and brain perceive the complement of the absorbed colors.

Answer:

1.15 Kilo-joules are provided as electricity

Explanation:

The law of conservation of energy states that: "Energy can neither be created nor destroyed, but can convert from one form to another".

Applying this on the givens, we would find that:

driving energy = energy provided as electricity + energy lost as heat

2.75 = energy provided as electricity + 1.6

energy provided as electricity = 2.75 - 1.6 = 1/15 kilo-jo

A seismograph is an instrument that detects and records the vibrations caused by earthquakes, while a seismogram is the recorded data or output from a seismograph. The inner core of the Earth is solid due to the immense pressure that forces atoms closely together, despite the high temperatures.

The key difference between a seismograph and a seismogram lies in the role they play in studying seismic activity. A seismograph is an instrument that records movements within the Earth, measured by the intensity and duration of earthquakes. It essentially measures the vibrations caused by an earthquake. On the other hand, a seismogram is the actual recording produced by a seismograph. It is the visual output, typically a graph or chart, that scientists look at when studying earthquakes.

As for your second question, the inner core of the Earth is described as solid. Despite the extremely high temperatures, the immense pressure at the core forces atoms closely together, resulting in a solid state.

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Anhydrous calcium chloride is a desiccant used to remove water vapor from the air in a desiccator to protect sensitive samples. It has a high affinity to water, indicating its saturation by changing the color of indicators like cobalt chloride, and is essential for maintaining sample integrity in laboratories.

Anhydrous calcium chloride (CaCl₂) is a desiccant used to remove water vapor from the air within a sealed container known as a desiccator. This desiccator is often employed to ensure that samples do not reabsorb moisture from the air after being heated or dried. Anhydrous calcium chloride's high affinity for water allows it to effectively absorb water vapor, turning into a hydrated form of the compound.

By using indicators such as cobalt chloride (CoCl₂), which changes color from blue to pink upon hydration, one can easily monitor the status of the drying agent. This is essential because once the desiccant has absorbed all the water it can, it becomes less effective and should be replaced or regenerated. Other hygroscopic substances like Magnesium Chloride (MgCl₂) and calcium sulfate (CaSO₄) can also serve as desiccants, though their water affinity may vary.

Desiccators are also equipped with perforated plates to hold samples and sometimes a stopcock for evacuation. In laboratory settings, drying agents are critical for maintaining the integrity of various chemicals and samples that can be compromised by the presence of water. As such, the selection of an appropriate desiccant and proper use of a desiccator are important laboratory techniques.

Answer:

breathing

Explanation:

The answer is an organ.

Answering the question, a plant root is an example of an organ

Plant consist of different organs, which include leaves, stem, reproductive organs, and roots. All the organs play a different role in the plant.

The functions of the different organs present in the plant include:

The plant consist of many cells and in a tissue, there are cells that work together, particularly similar cells. Also, each of the tissues carries out different functions.

For example, the dermal tissue serves as protection to plant and also monitor the interaction within the plant environment. Dermal tissue also prevents the plants from losing water.

All the organs that a plant possesses allow it to perform the important process of life.

The processes of life are seven, which include

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