Child Development Essay Example | Topics and Well Written Essays - 500 words

Child Development - Essay Example e â€Å"feelings†, while the behaviorist would take a more practical approach and try to show the young child that there was indeed nothing to fear in the dark externally. Chapter 2 †¨2a Connection: Read the description of the study investigating antisocial boys and their friendships on page 44 of your text. The data collection method was structured observation. What type of research design did the researchers use, and why? †¨Ã¢â‚¬ ¨ The researchers used qualitative research in order to study antisocial boys and their friendships.1 Structured observation is a more qualitative type of measurement than necessarily a quantitative one would be. The type of research design should be correlational; this method should be utilized because it would probably be the most fruitful. 3a Application: Nora, pregnant for the first time, has heard about the teratogenic impact of alcohol and tobacco. Nevertheless, she believes that a few cigarettes and a glass of wine a day wont be harmful. Provide Nora with research-based reasons for not smoking or drinking. †¨Ã¢â‚¬ ¨ Nora should know that research shows that expectant mothers who smoke typically have lower birth weights and are much more likely to be born premature. Also, drinking alcohol while pregnant may pose a significant development risk to the fetus, and continued drinking (of one glass per day) could give the child Fetal Alcohol Syndrome, which is characterized by certain facial deformities. 4b Application: After several weeks of crawling, Benji learned to avoid going headfirst down a steep incline. Now he has started to walk. Can his mother trust him not to try walking down the steep surface? Explain, using the concept of affordances. †¨Ã¢â‚¬ ¨ Benji’s mother should not trust the baby to walk down a steep surface even though he has stopped going headfirst down a steep decline. His balance might not totally be adjusted yet since he is just learning to walk. The baby must use the concept of affordances to derive (by

Synthesis of Gold Particles and Their Use for Chemical Sensing Assignment

Synthesis of Gold Particles and Their Use for Chemical Sensing - Assignment Example e it clear that the gold was eligible since there was a continued accumulation that was evident by the change in the color of the solution from red to Purple color. It is important to test the foods sold in commercial markets. Notably, it had been discovered some sold in the commercial markets are toxic. For examples, some years ago, foods containing melamine were found in stores in China. Foods that contain melamine are toxic and are not fit for human consumption. Thus, foods that were found in stores in China were poisonous. Fortunately, a solution to this problem has been found. The use of citrate ions prevents the accumulation of layers of gold thereby hindering the formation of melamine that prevent the formation of nanoparticles on the surface of gold. This process enables shielding continued reaction of the gold layers. When such interactions occur in food gold solution that causes coloration of food is formed. The particle size having effects on gold can also be determined through photography. The size of gold particles ranges from 10 to 20 nm reflect light of different colors particularly red that turns to blue or purple if larger. The refore, the chemical test for melamine can reveal varied collect chemical properties that can help in drawing conclusions. Usually, there is a color changes from red to blue when a solutions nitrate ions and gold particles are mixed. The significance of this chemical experiment lies in this interaction Procedure. Take 0.2 mL of 100 mM gold salt stock solution and add 20 mL of distilled water to make 20 mL of 1mM gold salt solution. Then take 20 mL of the 1mM NaAuCl4 and place it into 50mL beaker. Place the beaker and its content hot plate and stirred the mixture using a magnetic stir bar. Heat the solution until it boil. When the solution begins boiling, add 2 mL of 38.8 mM solution of trisodium citrate dehydrate (Na3C6H5O7.2H2O). The gold solution forms gradually as the citrate reduces the Au ions to the neutral gold