Chapter 4 Assessment

Pg 112 :

28.  All matter is composed of atoms which contains protons, neutrons, and electrons in the nucleus

35. the cathode ray

39. The electrons stay confined in the nucleus because they are negative, and the protons are positive which attract. So the electromagnetic force cause them to stay.

40. The tube is filled with low pressured gas so its not like its hectic in their. The particles connect to the opposite charges as the voltage and magnetic force runs.

50. The superscript in the notation represents the mass number and the subscript stands for the atomic number.

51. You know the mass number and atomic number but how do you find out the number of neutrons? Well  if you have those two things, you take the subtract the atomic number to the mass number which will figure out the number of neutrons.

60.  Vanadium (V) protons: 23 electrons: 23----> Manganese (Mn) protons: 25 electrons:25----> Iridium (Ir) protons: 77 electrons: 77----> Sulfur (S) protons:16 electrons: 16

64. Cs- protons & electrons: 55 neutrons: 80

      Co- protons & electrons: 27 neutrons: 32

      Tm- protons & electrons: 69 neutrons: 94

      Zn- protons & electrons: 30 neutrons: 50

65. a: 31 protons & electrons, 33 neutrons
      b. 9 protons & electrons, 14 neutrons
      c. 22 protons & electrons, 26 neutrons
      d 2 protons & electrons, 6 neutrons
68. percent abundance (mass) = atomic mass. .  51.992
72.  
85.  You cannot  pass your hand through an solid object even though atoms are primarily composed of empty space just because they are all connect in place vibrating.

Pulling apart mixtures

In the beginning I made a crazy mixture with my crew (Nika and Tasha)we put sugar,  calcium chloride and marble chips. Stir, stir, stir til its all mixed together and we swabbed mixtures with another group. Not knowing whats in their container i got a magnet trying to pull the iron out, finding out their is none. I could tell their was a bunch of sugar, a little of marbles chips, sand and calcium chloride. Using a wired net, we separated the big chunks with the little sugars and sand which is called filtration. Marbles chips and calcium chloride in one container, sugar and sand in the other. We weighed the sand and calcium chloride. Used water to dissolve the calcium chloride and subtracted the marble with the total amount. Then on to the next container, sugar, sand and we added water. It was like a filter (filtration), a funnel cup with a paper folded in a certain way, we poured the whole mix in and it separated the sugared water and the sand. This took long time but it sure did work. Used math to get the measurements and BOOM separation complete!


This is how it was folded------>

And this is an example of a different type of filter: