Grouping Of Elements

1) The groups of elements at the end of the lab were: lead,aluminum,zinc,silicon,sulfur,carbon and 

phosphorus.

2) The four properties that our group tested in the lab were appearance, electric conductivity, the crush test, and the elements reactivity with acid. Appearance is a physical property, because the elements appearance is a property that you can see with your eyes. Also, the crush test is a physical property to see if the element is brittle, or malleable, which means it's ability to bend or break. It’s a physical property because if or if not the element breaks has nothing to do with any chemical properties inside of the element. The element’s reactivity to acid is a chemical property, this is because the acid is reacting with all of the atoms inside the element, and so it’s reacting with the element and and creating new bonds of atoms. 


 3A) What’s unique about elements that are Metalloids is that they are not full metals, or none metals, they are “Semimetals”, which is sometimes used in place of the word Metalloids.


 3B) The only metalloid we tested in our lab experiment was Silicon (Si)


 3B) The metalloids are Boron (B), Silicon (Si), Geranium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te), and Polonium (Po).


 4A) The trend that appears as you read the Periodic Table from left the right in terms of Metallic Character is that as the table moves to the right, the elements become less and less Metallic. Whereas if the table moved the opposite way, the elements would become more metallic.


 4B) The trend that appears as you read the Periodic Table From top to bottoms in terms of Metallic Character is that as the table goes down, there are most Metallic elements in each of the  rows.

Lab 1-4 Physical and Chemical Changes

In a chemical change, bonds are broken and new bonds are formed between different atoms. This breaking and forming of bonds takes place when particles of the original materials collide with one another. An example of a chemical change is Photosynthesis - a process in which carbon dioxide and water are changed into sugars by plants. This is a chemical change because two different chemicals taken into the plant when combined with the sun give off the chemicals in a different form.
A physical change is a change in which original substances remain unchanged and no new substances are produced. An example of a physical change is pulling copper into a thin wire - a change of shape, but not a change of composition. No new substances are produced; the only thing that changes is the shape. The type of evidence that you could be looking for in a physical change is physical properties of the element being tested or changing. 

The type of evidence you could be looking for in a chemical change the chemical bonds or chemical reaction to different elements have changed or have varied in different ways. When you are stuck in a scenario and you do not know whether a physical or chemical change is being taken place, a resource you can use is refer back to what you know about physical and chemical changes, you could see if heat/light is being absorbed or released or if a solid substance appears. The solution of sodium polyacrylate and water looks like pectin, and it could not be clear whether it is a chemical or physical change. This change would be a physical change because the reaction could be reversed and chemical changes cannot be reversed.

This is a physical change because it is a phase change.