Hardness Testing Lab Report

* Copper, gold and aluminum are all alloyed with other metals to make them harder.

Procedure- The procedure for this lab includes many simple steps and a few different things we are testing. Our first Procedure was to combine water and salt to see what kind of reaction it would make. First we fill the graduated cylinder with 100 ml of water. We then measured 1.0 grams of table salt on a balance to get an accurate amount. After, we took the measured amount of salt and poured it into the water filled beaker. Lastly, we watched and recorded the reaction.

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

a. How many cleavage planes or surfaces are present on the specimen? Number of cleavage planes: 7

1. Decide if the mineral is metallic or non-metallic based on its luster and streak.

In this project, C. Elegans are hermaphrodite worms that will be used since they are easy to maintain in lab, as well as have short life cycles. The gene that the project attempted to knockdown in C. Elegans with RNAi treatment is the unc-22 gene. RNAi disrupts gene expression in the presence of double stranded RNA (dsRNA) that is complementary to target gene sequence. The unc-22 gene codes for a muscle protein called twitchin in wild-type worms. The Unc-22 is required for muscle regulation and maintenance in C.Elegans. To verify that the RNAi treatment worked, would check the unc-22 mRNA levels in the worms, in addition to phenotype observation.

2. (5 pts) List and explain the names and affiliations of the various characters/stakeholders in this story – I’m looking for us to use the story to map out the complexities that are generally associated with solving public health puzzles – the stakeholders you list and explain here should apply to many of the cases we consider going forward.

First, each metal’s description and weight was recorded. Additionally, the weights of each cylinder used was recorded. Next, a graduated cylinder was filled with 20mL of water and unknown metal II was fully submerged in the water 3 times. Each time, the volumes were recorded and the difference between the final volume and initial volume was calculated. This test was repeated for unknown metal IV.

Minerals are said to have a different level of hardness, this means that some of the minerals are softer compared to others. Certain Minerals have the ability to be scratched or left marks in as with others one cannot mark in the surface

The visit influences our practical as we gain an understanding of how in the engineering industry selection of materials is determined using indicators such as Young’s Modulus. Young’s Modulus is a measure of stiffness that is independent of the particular sample of a substance. This indicator is very vital as it determines the material’s strength, toughness

14) Which one of the following minerals has the greatest hardness on the Mohs hardness scale? A) Feldspar B) calcite C) gypsum D) topaz 15) Which of the following best defines a mineral and a rock? A) A rock has an orderly, repetitive, geometric, internal arrangement of minerals; a mineral is a lithified or consolidated aggregate of rocks. B) A mineral consists of its constituent atoms arranged in a geometrically repetitive structure; in a rock, the atoms are randomly bonded without any geometric pattern. C) In a mineral the constituent atoms are bonded in a regular, repetitive, internal structure; a rock is a lithified or consolidated aggregate of minerals. D) A rock consists of atoms bonded in a regular,

Sample 3 achieved a higher Rockwell C rating than its initial "As Received" hardness with every type of quench.. Whereas samples 1, 2, and 4 softened during the annealing process but increased in hardness with the other quenching medias.

The results of total hardness from AA was found to be higher than the results

As seen in the Fig. 2, there is a dramatic increase in the hardness (31.66 to 65HRB) of the material over a

For purposes of accepting or rejecting the load: Sampling after 0.2 m3 of the load has been poured.