Lab #1 :Osmosis in potato Slices

   

1. If you place a salt water, with the water molecules move into or out of the potato cell ? Into the potato cell.
2. When we place a potato slices in fresh water the slices become? crisp.

Osmosis
 Salt water great concentration of salt. Less concentration of salt water molecules inside the potato.

 Equal Concentration H2O. 

Chemical Change Power Point

This my power point of the speech the last monday jeje =) ...................................................

Chemical Change =)

Compound = a chemical combination of two or more elements.

Chemicals bond = a link that atoms or electrically charged particles can form with each other.

Chemical formula = a way of using letters and numbers to show how much of each element is in a substance.

Ion = an electrically charge particle with unequal numbers of protons and electrons.

Molecucle = a Group of bonded atoms that acts like a single particle.

Chemical Property = a way of describing how  a substances change chemically with other substance.

Exothermic =a reaction that gives off heat.

Endothermic= a reaction that absorbs heat.

Elements and Atoms

§         Element: a susbtance that cannot be broken down any further into anything simpler.

 

§         Atom: the smallest particle of an element that has same chemical properties as the elements.

 

§         Nucleus: an atom’s dense center where most of its mass it.

 

§         Electron: a negatively charged particle that moves around an atom’s nucleus.

 

§         Proton: a positively charged particle inside an atom’s nucleus.

 

§         Neutron: a particle with no charge inside an atom’s  nucleus.

 

§         Atomic number: the number of protons in am atom.

 

§         Metal: any of a group of elements that conduct heat and electricity, is shiny and bendable.

Physical Poperties

 Matter: Any solid, liquid, or gas.

 Mass: Amount of matter in an object.

 Volume: The amount of mass in a certain volumen of materials.

 Density: The amount of mass in acertain volume of materials

 Physical Properties: A property that can be observed without changing the identity of a substance.

 Solution: a mixture of one substance dissolved in another so that the properties are the same throughout.

 Chemical change: a change in matter that produces a new substance with different properties from the original.