2017年8月5日 · A polyphonic texture refers to a web of autonomous melodies, each of which contributes to the texture and the harmony of the piece but is a separate and independent strand in the fabric, so to speak. An example is the section in the "Hallelujah" chorus where the choir sings "And he shall reign for ever and ever."

2014年2月4日 · You can identify an unknown substance by measuring its density and comparing your result to a list of known densities. Density = mass/volume. Assume that you have to identify an unknown metal. You can determine the mass of the metal on a scale. You can determine the volume by dropping the object into a graduated cylinder containing a known volume of water and measuring the new volume. You ...

2016年8月4日 · "Al"^(3+): 1s^2 2s^2 2p^6 Your starting point here will be the electron configuration of a neutral aluminium atom, "Al". Aluminium is located in period 3, group 13, and has an atomic number equal to 13. This tells you that the electron configuration of a neutral aluminium atom must account for a total of 13 electrons. The electron configuration of the neutral atom looks like this "Al: " 1s^2 ...

2018年6月6日 · There are five basic atomic models which have contributed the structure of the atom itself. They are: =>John Dalton's atomic model: Dalton´s Billiard Ball (Solid Sphere) Model =>J.J. Thomson's model: Plum Pudding model =>Ernest Rutherford's model: Nuclear model =>Niels Bohr's model: Planetary model =>Erwin Schrödinger's model: Electron Cloud Model/Quantum Model

Animal classification is the categorizing of animals and organisms hierarchically.. The ranking system is based on a fixed number of levels such as kingdom, family, or genus.

2015年10月13日 · There are four levels of protein structure. The short answer is these levels of structure give a protein its overall shape. The job (function) of the protein depends on its shape. The video below discusses the topic of protein structure. Key ideas- 1. The sequence (order) of amino acids in a protein will determine the shape of the protein 2. The job of a protein is determined by its shape 3. A ...

The melting points of the Period 3 metals sodium and magnesium are shown below. What is the differences in the melting points of sodium and magnesium, using the model of metallic bonding?

2017年6月20日 · This is the ratio of phenotypes in a dihybrid cross. If both parents are heterogeneous for both traits the ratio of phenotypes is the ratio of 9:3:3:1. One trait is dominant and the other trait is recessive. Of the 16 possible offsprings only 1 will have both recessive genes. Only with double recessives will the phenotype show both recessives. Nine will have at least one gene for both dominate ...

2017年2月9日 · Homogenous populations are alike and heterogeneous populations are unalike. Homogenous means alike. Heterogenous means unalike or distinct from one another. Thus, a homogenous population has little variation. You could refer to a specific trait, such as hair color or you could refer to genetic diversity. For example, a population of humans that has inhabited an island for thousands of years ...

2015年10月18日 · buried deep beneath the earth When Sedimentary rocks are buried deep beneath the Earth's surface, great pressure and tremendous heat change these rocks into new rocks containing different minerals. These are Metamorphic rocks.