CHM 2011 Exam I Chapter 1 Chemical Foundations a Qualitative

CHM 201-1 Exam I. Chapter 1 -Chemical Foundations a) Qualitative Section 1. What are the steps in the Scientific Method and describe them? 2. What is the difference between \'precision\' and \'ac 3. Given the Figure below, which describes the results of several dart throws, explain them in curacy?\" term s of the degree of accuracy and precision of the dart throws. e) Acura 4. How many states does matter exist in and what are they? 5. What is the difference between a homogeneous and heterogeneous mixture? 6. What is the difference between a chemical and physical change? b) Quantitative Section Table 1-2The Prefixes Used in the SI System (Those most commonty encountered are shown in blue. Table 1.4 English-Metric PrefixSymbol Equivalents ,000,000,000,000,000,000 1,000,000,000,000,000 000,000,000,000 1,000,000,000 1000,000 1,000 100 Length peta 1 m- 1.094 yd 2.54 cm- 1 in 1kg-2205 lb 453.6 g-1 Ib L-106 qt 1 f 28.32 L Mass Volume 01 001 0 001 0000001 0.000000001 10 10 10 3 104 10 10-13 10-H 10-9

Solution

1-Question,Research(Conduct background research. Write down your sources so you can cite your references) ,Hypothesis,Experiment,Data/Analysis(Record observations and analyze what the data means. Often, you\'ll prepare a table) ,Conclusion(Conclude whether to accept or reject your hypothesis)

2-The definition of precision says that precision is when the values of repeated measurements are clustered and have little scatter whereas accuracy refers to how close a measurement is to the true value.Precise values differ from each other because of random error, which is a form of observational error.

4-there are 5 states of matter-

solid,liqiud,gas,plasma,Bose-Einstein condensates

5-A homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. The composition of the mixture is the same throughout , a heterogeneous mixture does not have uniform in composition, but proportions of its components vary throughout the sample.

6-A physical change in a substance doesn\'t change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.