How does the law of conservation of mass apply to a food web?

How does the law of conservation of mass apply to a food web?

The food used by organisms has a high level of useable mass and energy. When the food is burned the mass and energy is at much lower level of useable energy and mass. The mass released as Carbon Dioxide and Water are lost to the food pyramid.

How do you explain conservation of mass?

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

What are the two principles of conservation of charge?

The principle of conservation of charge states that the net charge of an isolated system remains constant during any physical process, e.g. two charge objects making contacting and separating.

What is Electroscope for?

Electroscope, instrument for detecting the presence of an electric charge or of ionizing radiation, usually consisting of a pair of thin gold leaves suspended from an electrical conductor that leads to the outside of an insulating container.

How many types of Electroscope are there?


What are the two types of charge?

Electric charges are of two general types: positive and negative.

How does a needle Electroscope work?

Being positively charged, the electroscope attracts some electrons from the conducting material (in this case, a person). The negatively charged electrons enter the electroscope and neutralize the positive charge. As the electroscope loses its charge, the needle relaxes back to its naturally upright position.

What happens when you touch the plate of the Electroscope with your finger?

Bring it close to the top plate of the electroscope – but don’t let it touch. This will induce the opposite charge on the plate of electroscope leaving a net charge on the gold leaf, which will rise. Now touch the plate with you finger momentarily to earth it (still holding the charged insulator near the top plate).

What happen when you touch the Electroscope with your bare hand?

In typical electrostatic experiments and demonstrations, this is simply done by touching the electroscope with one’s hand. Upon contact, the excess electrons leave the electroscope and enter the person who touches it. These excess electrons subsequently spread about the surface of the person.

What are the parts of an Electroscope?

An electroscope consists of a vertical metal rod that sticks out of a glass enclosure; a piece of plastic​ ​prevents electric charge from going from the metal rod and metal leaves at the bottom on to the cylindrical enclosure, which is usually metal as well.

How do you make an Electroscope?


  1. Perform this experiment on a dry day!
  2. Use the scissors to cut a two-inch long piece of straw.
  3. Have an adult punch a hole through the center of the jar lid or piece of plastic big enough to fit the straw through.
  4. Insert the straw into the hole for your lid.
  5. Cut a 10-inch piece of copper wire.

How do you make an Electroscope Class 8?

A simple electroscope can be constructed as follows.

  1. Take a glass container.
  2. Insert a metal wire inside it.
  3. To the ends of the wire, which are inside the jar, attach 2 metal plates(say aluminium plates).
  4. The other end is outside the glass container is connected or brought in contact with charged body.

Why do we use aluminum foil instead of plastic or paper?

Aluminium, amazing as it gets, without burning or melting into the food, allows the steady roasting of the food it is intended to protect. If instead plastic was used, it would naturally melt into the food, render it poisonous and give it a taste you cannot even begin to fathom

Who invented Electroscope?

William Gilbert

When was the first Electroscope made?


When was the Electroscope invented?


What is a pith ball?

Pith balls are little styrofoam (or similar material) balls coated in conductive paint. When a charged rod is brought close to the pith balls, their charges polarize. If they come in contact with the charged rod, they can inherit the same sign charge. Since like charges repel.

Is a pith ball positive or negative?

The pith ball becomes negatively charged and is repelled by the rod.