Question

.Eckstt Chemistry 111- Test 1-50 points Chapters 1, 2 and 3 NAME Planck's Constant, h 6.63 x 10-341 Rydburg Constant, Rh 2.18 x 10-181 Avogadro's Number, Na 6.022 x 1023 Speed of Light, c= 3.00 x 108 m/s MULTIPLE CHOICE, Choose the one alternative that best completes the statement or answers the Circle your numerical final answer. Provide work and explanation for each question. question. 1) What is a unifying principle that explains a body of experimental observations? A) Phenomena B) Hypothesis C) Prediction D) Law E)Theory 1) 2) What is defined as a tentative explanation for observations that are made that result in the formulation of this concept? A) Phenomena B) Hypothesis C) Prediction D) Law E)Theory 3) 3) What is the term used for findings that are summarized based on a pattern ortrend? A) Hypothesis B) Theory C) Phenomena D) Law E) Prediction 4) Which of the following activities is not a part of good science? A) Proposing a theory B) Indulging in speculation C) Making quantitative observations D) Designing experiments E)Developing a hypothesis 5) Which one of the following is a "substance" in the sense of the word as used in your textbook? A) Tap water C) Sea water 1) Water 5 B) Air D) Toothpaste 1

Answer 1

1. E) Theory is unifying principle that explains a body of experimental observations.

2. B) Hypothesis is a tentative explaination for the observations that are made that result in the formulation of this concept.

3. D) Law is the term used for the findings that are summerised based on pattern observed.

4. B) Indulging in speculation is not a part of good science.

5. Answer is Water

Substance is a that has a specific composition and properties. Every pure element and pure compound is a substance. From the options given only water is a pure compound that can be called as substance. Others are some mixture of other molecules and compounds. Like Air, sea warer and tap water are the mixture of different elements and molecules, toothpaste is also made up of a mixture of some different chemical compounds.