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Drops of ethanol are attracted to a charged strip because ethanol is a polar molecule with a slightly positive and negative end. When a charged strip is brought near the drops, the positive or negative end of the ethanol molecule is attracted to the opposite charge on the strip, leading to the movement of the drops towards the strip.
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If a negatively charged polyethylene strip touches a neutral pith ball what charge will it have?
The pith ball will have a negative charge after touching the negatively charged polyethylene strip. This is because electrons are transferred from the strip to the pith ball, leaving the pith ball with a net negative charge.
How can you test pH levels?
You can test pH levels using pH test strips, a pH meter, or pH drops. Simply dip the test strip into the solution, or submerge the meter's probe, or add a few drops of the liquid to a small sample. The color change or reading will indicate the pH level of the solution.
What is a horizontal stack of staples called?
A horizontal stack of staples is typically referred to as a "staple strip." This strip holds multiple staples together in a row for easy loading into a stapler.
What is the principel of bimetallic strip?
The principle of a bimetallic strip is that it consists of two different metals with different coefficients of thermal expansion bonded together. When the strip is heated, the metals expand at different rates, causing the strip to bend. This bending action is utilized in devices like thermostats to control temperature.
What happens to bimetallic strip when it is heated and cooled?
When a bimetallic strip is heated, the two metals expand at different rates causing the strip to bend towards the metal with the lower coefficient of thermal expansion. Conversely, when the strip is cooled, it bends towards the metal with the higher coefficient of thermal expansion. This bending action can be harnessed for applications like thermostats and temperature-sensitive switches.
What happens when you rub an acetate strip with tissue paper and then hold the strip near running water?
Rubbing an acetate strip with tissue paper transfers electrons, giving the strip a negative charge. When you hold the strip near running water, the positive ions in the water are attracted to the negatively charged strip, causing the water stream to bend towards the strip due to the electrostatic force between the charged objects.
What if a charged strip is placed between two electrically neutral pith balls hanging side by side?
The charged strip will induce opposite charges in the pith balls, causing them to be attracted to the strip. As a result, the pith balls will move closer together due to the electrostatic force of attraction.
What is the effect of placing a few drops of ethanol on hand?
Placing a few drops of ethanol on the hand can temporarily dry out the skin due to its evaporation properties. It may also disinfect the area by killing some bacteria and viruses present on the skin. However, it can also strip the skin of its natural oils, potentially causing irritation or dryness with repeated use.
How do you determine if an object has been charged or not?
What I personally would do is tear a strip from a sheet of nose- or toilet-tissue, hang it next to the object under test but not touching it, and see if the paper is attracted to the object. I call it the 'poor man's gold leaf'.
An unknown material is rubbed with silk and becomes charged Explain how you could use a negative acetate strip or a positive glass rod to determine the type of charge on the unknown material?
You can use the negative acetate strip or positive glass rod to determine the type of charge on the unknown material by bringing them close to the unknown material after it has been charged with silk. If the negative acetate strip is repelled by the unknown material, then the unknown material has a negative charge. If the positive glass rod is attracted to the unknown material, then the unknown material has a negative charge.
If a negatively charged polyethylene strip touches a neutral pith ball what charge will it have?
The pith ball will have a negative charge after touching the negatively charged polyethylene strip. This is because electrons are transferred from the strip to the pith ball, leaving the pith ball with a net negative charge.
What happens if a balloon and a cloth after rubbing is in contact with a metal strip answers?
The balloon becomes negatively charged due to the transfer of electrons from the cloth. When the negatively charged balloon comes in contact with the metal strip, electrons will flow from the strip to the balloon, neutralizing the charge on the balloon. This process is known as static discharge.
When an acetate strip is charged by a rubbing does it acquire a positive charge or a negative charge?
When an acetate strip is charged by rubbing, it acquires a negative charge. This is because acetate is a type of material that tends to lose electrons easily when rubbed, causing it to become negatively charged.
How can you positively charge an electroscope using an acetate strip and a paper towel?
Rub the acetate strip against the paper towel to transfer electrons from the acetate strip to the paper towel, leaving the acetate strip positively charged. Touch the electroscope's metal knob with the positively charged acetate strip to transfer the positive charge to the electroscope. This will cause the electroscope's leaves to repel each other, indicating a positive charge.
What will you do with a plastic strip so that it can attract tiny bits of paper?
You can rub the plastic strip with a cloth made of wool or fur to create a static charge. The static charge will attract the tiny bits of paper to the plastic strip.
What is indicated when the paper bits move towards the rubbed plastic strip?
The movement of paper bits towards the rubbed plastic strip indicates the presence of static electricity. When the plastic is rubbed, electrons transfer from the plastic to the paper, causing the paper bits to be attracted to the strip due to opposite charges.
Why is methanol rather than ethanol preferred for transesterification in the refining of soybean oil to make biodiesel?
May be because it gives more volatile esters, easy to separate or concentrate or strip off.
