Table of Contents
Where did almost all of the atoms in your body come from originally?
The particles we’re made of The hydrogen atoms in you were produced in the big bang, and the carbon, nitrogen and oxygen atoms were made in burning stars. The very heavy elements in you were made in exploding stars.
Is water a physical or chemical change?
Water is the only known substance on Earth that exists naturally in three states: solid, liquid, and gas. To change between these states, water must undergo physical changes. When water freezes, it becomes hard and less dense, but it is still chemically the same.
Can quarks be broken down?
Scientists’ current understanding is that quarks and gluons are indivisible—they cannot be broken down into smaller components. Because of this, quarks and gluons are bound inside composite particles. The only way to separate these particles is to create a state of matter known as quark-gluon plasma.
Are quarks made of nothing?
As far as we know currently, quarks are fundamental — therefore, they are not “made of” anything. A quark is just a quark, and an electron is just an electron.
What happens when you observe an object in the water?
Observing Objects in Water. An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air.
Can we observe physical properties without changing the state of matter?
We can observe some physical properties, such as density and color, without changing the physical state of the matter observed. Other physical properties, such as the melting temperature of iron or the freezing temperature of water, can only be observed as matter undergoes a physical change.
Why do fish appear closer to the surface than they really are?
An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air. This tutorial explores how fish, observed from the bank of a pond or lake, appear to be closer to the surface than they really are. Observing Objects in Water
What are the physical and chemical properties of matter?
All substances have distinct physical and chemical properties, and may undergo physical or chemical changes. Physical properties, such as hardness and boiling point, and physical changes, such as melting or freezing, do not involve a change in the composition of matter.