Hydrogen
Hydrogen is a tasteless, odorless, colorless gas. Hydrogen is found in group 1 and period 1 on the periodic table. Hydrogen is classified as a nonmetal on the periodic table. The symbol for hydrogen is represented by an H, its atomic number is 1, and its atomic weight is 1.0079. The hydrogen atom consists of one proton, which has a positive charge, and one electron, which has a negative charge. The term hydrogen comes from two Greek words meaning water-former. Henry Cavendish, an English scientist, discovered it in 1766. Named by Lavoisier, hydrogen is the most abundant of all elements in the universe. The sun and many other stars consist of mostly hydrogen. It is the third most abundant element on earth. It is estimated that hydrogen makes up more than 90% of all the atoms or three quarters of the mass of the universe. Hydrogen plays an important part in powering the universe though both the proton-proton reaction and carbon-nitrogen cycle. Hydrogen occurs in almost all organic compounds. Many of the compounds found in plant and animal tissues are organic. Production of hydrogen in the U.S. alone now amounts to about 3 billion cubic feet per year. Some of the methods that hydrogen is prepared by are steam on heated carbon, decomposition of certain hydrocarbons with heat, action of sodium or potassium hydroxide on aluminum, or displacement from acids by certain metals. Hydrogen may be condensed to a liquid that boils at -257.87°C and freezes at -259.14°C. Hydrogen ...
Between 1865 and 1900 technology, economic conditions, and government policy influenced American Agriculture greater than it ever had before. Technologically, Railroads, factories, and farm equipment changed American agriculture by allowing the production of farmed goods to be increased substantially, while economic conditions caused the prices of these goods to go down and then fluctuate. Farmers hurting from the economic disarray began influencing the laws being passed to help them in their economic troubles. Because of the influence of technology, government policy, and economic conditions between the 1865 and 1900 American agriculture was affected.
Oxides of Hydrogen Introduction: Hydrogen atoms can react with oxygen atoms forming different compounds. There are mainly two types, one is water and the other is hydrogen peroxide. Structure: A water molecule is made up of two hydrogen atoms and one oxygen atom joining together by covalent bonds. The shape of it is bent and its bond angle is of 105°. The structure is shown below.
Maturity is a coming of age when a person is growing emotionally and mentally. Maturity is gained by experiences and decision-making, thus learning from mistakes. This is evident in the novel To Kill a Mockingbird by Harper Lee. Through characterization and symbolism Lee displays maturity.
Many differing opinions exist on what needs to be done about our current status of conserving energy and conserving our environment. With increased gas prices and energy costs, consumers are more aware of what benefits are available and the methods of obtaining them. The introduction of hydropower has been a major step for some, while a stumbling back for others. Advocates for hydropower have provided much information about the many benefits that we reap from using hydroelectric dams. Environmental activists denounce the many negatives that are created by the numerous dams located throughout the United States as well as other countries. Both sides present valid arguments and need to be addressed in order to fully understand the complex social, biological, political, and economic pros and cons.
The oxygen atom is joined to the hydrogen atom as well as the carbon atom, which makes the oxygen a part of a hydroxyl group. These atoms are generally part of a hydrocarbon chain. These alcohols can take away water from the body, in which a hydrocarbon chain has replaced a hydrogen atom. Alcohols have a general structure of CnH2n+1OH. The aim of this investigation is to see the link between the number of carbon atoms in a fuel with the amount of energy it releases.
One of the many benefits that standardize testing provides, is a comparison of academic performance. This means that teachers are able to look at their students’ scores and are able to see what areas that their students scored low in. This allows for the teachers to revisit concepts that were not clear. By going over the scores teachers are able to see what they need to improve upon. This is beneficial for the students
Standardized testing is the most commonly used and well known method of testing used in the United States and many other countries around the world, but can harm educational quality and promote inequality. Standardized testing is used to determine student achievement, growth and progress. Standardized tests are tests that attempt to present unbiased material under the same, predetermined conditions and with consistent scoring and interpretation so that students have equal opportunities to give correct answers and receive accurate assessments. The idea is that these similarities allow the highest degree of certainty in comparing results across schools, school districts, or states. Standardized tests are also used to determine progress in schools,
As the testing season has come and gone, the topic of whether or not standardized testing as a productive aspect of the current curriculum is a very popular topic of discussions. With all of the varying opinions about whether or not standardized testing is necessary, it is difficult for citizens to understand the truth. Those that are in acceptance with the current curriculum and agree that standardized testing is a good thing state that the tests are a key component in schools for the well being of not only the students, but for the prosperity of education as well. The advantages to using standardized testing includes necessary information they give to parents about how their child is performing,
The term Test standardisation ensures that everything is the same for all participants and scores from a test will be marked by comparing individual scores against an average of people within the same circumstances and age group, For example a test designed for adults would not be sat by children and vice versa. An example of the importance of test standardisation can be seen in the Wechsler test which originally gained its test norms by comparing people from white, educated, empowered backgrounds however the most recent updated version ensured the test was more accurate by testing people with different social and educational backgrounds resulting in a fairer more accurate
There is added pressure to schools to get better scores which adds pressure to the educators and the students. The added pressure can cause health problems with the students or the educators. If health problem come from the stress of the tests it could negatively affect the student’s ability to learn (Pros and Cons, 2013). The test itself is a problem as well. The test is supposed to be unbiased based on the grade level but in most cases the test is not. As much as they try...
The hydrogen and the hydroxide ions react to form water. As bonds are made this is an exothermic reaction so heat will be given out and this will be shown as an increase in temperature. The chemical energy will be negative ( H is minus). APPRATUS/MATERIALS:- 1. Polystyrene cup [IMAGE] 2.
I will need to be able to assist parent in interpreting their child’s standardized test scores. I will need to be able to explain why students are tested and explain what the different types of scores are. How I can help my parents is help them understand that these test are tools to track their student’s progress, strengths, weaknesses, and if their students is working up to their full potential. If my parents are really concerned I can provide them with information that will help answer any questions they have. I can also have my parents speak with the school’s counselors if they are still concerned after talking with
It is very common to hear that standardized tests measure students hability to test and not how much they have learned . A standardize test can’t determine student’s skills properly, because they are not tailored to different learning styles, they do not measure overall studen capacity for aplication and use of knowledge.
Standardized testing can be traced all the way back to the seventh century in China. Chinese officials started to administer written test to select individuals for civil service. Standardized testing is more common than most people realized and had important parts in America’s history. Tests in any subject let you know how you’re doing and a standardized achievement test is not any different. A standardized test allows the pupil to know how they are doing in a larger view. The only difference between a standardized test and regular old class test is the standardized nature of the one that is in fact standardized. The scores for standardized achievement tests can mean many different things from being college ready to proficient in math.
Standardized testing is used in schools to test if students learn the information they are taught and how well they apply it. These tests usually measure if a student can successfully meet the state standard requirements set by each individual state. All of the students are expected to take these tests and be prepared for them. However, the amount of tests they take can sometimes be too much for students to handle. There is a growing concern among parents, teachers, and students of the overabundance of standardized testing throughout the United States. Students are required to take these tests and can be overwhelmed with the amount of material they have to know. With everything that is required of teachers, sometimes it is difficult