science help for matter?

Question

1. The smallest part of the element that has all the elements properties is?
2. A chemical change occur when?
3. The state of matter in which atoms are held together strongest is?
4. What is different between physical and chemical change?
5. What holds the atoms in a molecule together?

Answer 1

1. atom
2. atoms combine to form compounds
3. solid
4. you keep the same material in a physical change, in a chemical change you get a new material
5. bonds between atoms are done by the exchange or sharing of electrons

Answer 2

The guy above is clueless. Ignore most of the answers

1. An atom. Hydrogen and nitrogen both have electrons, but if you took one from each you wouldn't be able to tell the difference.

2. Chemical changes occur when intramolecular bonds form and/or are broken. That means that you go from one type of molecule to another because the chemical bonds change.

3. Solid (he got one)

4. Physical changes don't break apart or add to a molecule. When water boils, it's undergoing a physical change. The water molecules might not be as tightly bound to one another, but they're still all H2O. The molecules themselves change in a chemical reaction, as described in 2.

5. In simple terms, certain electrons (negative charge) are attracted to multiple nuclei (positive charge from protons). This holds the atoms together. Read up a little for a more complete answer.

Answer 3

1. atom
2. an irreversible change occurs that changes chemical properties. can be seen by color change, bubbles, and/or formation of a precipitate.
3. solid
4. physical change changes physical properties such as size, shape, temperature, etc. chemical change changes identity/ chemical makeup, causing an often irreversible change that changes a substances identity.
5. bonds

Answer 4

1. The electrons

2. The atoms in a molecule collide together with other atoms with enough force, to join together ( I think :) )

3. A solid

4.

Physical => The change can be seen by eye

Chemical => The change it too microscopic to see with the naked eye.

5. The neutrons in one atom attracting the protons in another atom.


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