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by Ron Kurtus

A total of 250 comments and questions have been sent in. They are listed according to date.

List of next 10 letters

Country

Changing States of Matter What is boiling like? USA

Kinetic Theory of Matter Heat from colliding particles India

Changing States of Matter What is vinegar? Tanzania

Antimatter Mini-quiz on antimatter not adequate India

Kinetic Theory of Matter Concept of matter Nigeria

Snow How do clouds form rain? Jamaica

Pressure and States of Matter Volume at the change in state Philippines

Changing States of Matter Solid drops in temperature when changes to liquid Singapore

Atom as Solar System Can everything be separate universes? USA

Density Factors Why do Tin and Manganese have the same density? Canada

Next 10

First 10 letters

What is boiling like?

Topic: Changing States of Matter

Question

October 30, 2014

Boiling involves the same change of state as_______________

A. freezing B. condensation C. evaporation

- USA

25489

Boiling is the change of liquid to a gas. Likewise, water can evaporate to become a gas.

Heat from colliding particles

Topic: Kinetic Theory of Matter

Question

October 2, 2014

Materials get extreme heat on colliding with atomic particles. pls answer

Sunil - India

25420

The increase in temperature of an object depends on the velocity and mass of the atomic particles, as well as the mass of the material's particles.

What is vinegar?

Topic: Changing States of Matter

Question

September 21, 2014

COMMON COMPOUND AROUND US ARE WATER, CHALK, OIL, VINEGAR. WHAT IS THE MEANING OF VINEGAR?

PRAYGOD - Tanzania

25374

Vinegar is a mildly acidic liquid that is mainly used in cooking. Vinegar can be made from apple cider, beer, sugar cane, and other substances.

Topic: Antimatter

Question

August 22, 2014

Hi.
The Antimatter Mini-Quiz is extremely inadequate and consists of elementary flaws.
First off, three simple multiple-choice questions are not sufficient. Second, there are two basic mistakes:
(Q2) The anti-matter in the container won't combine with the matter. In fact, the electron and positron will be involved in a cosmic dance and then annihilate in a tiny fraction of a second. The same is with the proton and antiproton, and the neutron and antineutron.
(Q2)Energy is neither created nor destroyed; everyone knows that. So a great amount of energy is NOT 'created'; rather, the energy stored in the particles of matter and anti-matter are released with a great force, in the form of gamma rays.
Thankyou!

Rushda - India

25305

I am sorry you did not find the three questions in the Mini-quiz sufficient for your needs. I am sure you can purchase a physics textbook with many more questions and answers.

Question 2 did not address the time it takes for the atoms to interact and annihilate. However, I did correct using the word "created" to avoid any misunderstandings.

I updated the Antimatter lesson and its Mini-Quiz to correct any flaws.

Concept of matter

Topic: Kinetic Theory of Matter

Question

August 7, 2014

What are the consept of matter

25250

Matter is something that takes up space and has mass. See Overview of the Study of Matter for more information.

The Kinetic Theory of Matter simply says that particles of matter are in motion.

How do clouds form rain?

Topic: Snow

Question

July 30, 2014

how can clouds bond to form rain

shamar - Jamaica

25188

Clouds consist of tiny water droplets. Under the right conditions, the tiny droplets group together forming rain drops, which are heavy enough to fall to the ground.

The method of "cloud seeding" can artificially cause rain by shooting certain salt crystals into the clouds, that cause the droplets to condense into rain drops.

Volume at the change in state

Topic: Pressure and States of Matter

Question

July 27, 2014

Questions:
1. As the temperature raises and the matter changes from solid to liquid, then liquid to gas. How does the amount of space that the matter is taking uo change?

2.. As the temperature lower and the matter changes from solid to liquid, then liquid to gas. How does the amount of space that the matter is taking uo change?

Mary jane - Philippines

25166

Typically, the volume of the material increases as it changes from solid to liquid and liquid to gas. However, the volume of water is slightly less than ice at 0 degrees C until 3 degrees, when it starts to expand.

Water is one of the few materials that expands when it turns to a solid (ice).

Solid drops in temperature when changes to liquid

Topic: Changing States of Matter

Question

July 26, 2014

Two solids are heated. One of the solid had a measured temperature drop in the liquid state. What could be the reason for the temperature drop?

Julia - Singapore

25152

It is possible that the energy required to change from solid to liquid was sufficient to lower the temperature slightly. I'm not sure what solids this would refer to.

Can everything be separate universes?

Topic: Atom as Solar System

Question

April 7, 2014

I have always thought the same thing, atoms and solar systems are extremely similar. And one step further,Galaxies are similar to molecules. My question, is it possible that everything living is a separate universe? Be it a person, animal, vegetable, and God?

- USA

24848

A problem with considering galaxies as similar to molecules, it that galaxies usually have billions of stars. There are cases of double stars rotating around each other. This could be similar to a two atom molecule.

There is the Theory of Multiple Universes (Multiverse) that could apply.

Certainly, there are concepts that go beyond what is commonly considered,

Why do Tin and Manganese have the same density?

Topic: Density Factors

Question

March 31, 2014

I can see that atomic weight is a factor in determinimg density, but that isn't a complete answer. Consider the elements Tin (50) and Manganese (25). They have almost the same density ~7.3g/cu cm, but Manganese has an atomic weight of 54.9 while Tin has an atomic weight of 118.7. Transuranics like U-238 have a density of ~19.1 g/cu cm whereas Iridium has a density of 22.5 g/cu cm

24831

That is a good question.

Tin is soft and very malleable, while Manganese is very hard and brittle. Thus, the atoms in Tin are loosely separated, while those in Manganese are tightly packed. That would account for the similar densities, even though the atomic mass of Tin is higher.

Likewise, Iridium is very hard and brittle, while Uranium is relatively soft.

I updated Factors Affecting Density of Matter to improve the understanding of the material.

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