By Bettelheim F.A. et al.
Учебник по химии.
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Extra resources for Introduction to General, Organic, and Biochemistry
Sample text
If a statement sounded right, they believed it without testing it. About 1600 CE, the scientific method came into use. Let us look at an example to see how the scientific method operates. The Greek physician Galen (200–130 BCE) recognized that the blood on the left side of the heart somehow gets to the right side. This is a fact. A fact is a statement based on direct experience. It is a consistent and reproducible observation. Having observed this fact, Galen then proposed a hypothesis to explain it.
6, we get a number slightly less than 1. When we subtract the exponents algebraically (26 2 [28]), we get 2. This means that the answer is slightly less than 1 3 102, or slightly less than 100. 51E5, and press the “5” key. 56 3 1028. The algebraic subtraction of exponents is 23 2 5 5 28. 4 How Do We Make Measurements? In our daily lives, we are constantly making measurements. We measure ingredients for recipes, driving distances, gallons of gasoline, weights of fruits and vegetables, and the timing of TV programs.
Instead, they can be found in the problem (100. mg = 500. cc and 20. cc = 1 h). Solution We must convert the numerator from milligrams to grams and the denominator from cubic centimeters to seconds using the provided information. Because we know that 1000 mg 5 1 g, 60 min 5 1 h, and 60 s 5 1 min, we can solve this problem by multiplying these conversion factors and making sure the units provided in the problem cancel out: 1g g 100. mg 20. 1 3 10 26 500. cc 1h 1000 mg 60 min 60 s s Is this answer reasonable?