| 1. | | Passing an electric current through a certain substance produces oxygen and sulfur. This substance cannot be a(n) Your Answer: | element. | | | An element cannot be broken down into other elements. | | 2. | | Pick the chemical change that occurs when a lit match is held under a piece of metal. Your Answer: | match burns | | | Chemical changes‚ which release heat and light‚ occur during the combustion process. | | 3. | | Which identification is incorrect for the elements
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Rounding Examples *0.1356 (4 significant figures) -> Round answer to 2 significant figures *0.1356 -> 0.14 *314.705 (6 significant figures) -> Round number to 4 significant figures. *314.705 -> 314.7 *0.0035771 (5 significant figures) -> Round to 3 significant figures. *0.0035771 -> 0.00358 *500‚000 (1 significant figure) -> Write this number to have 3 significant figures. *500‚000 - 5.00 x 10^5 *39.501 -> Round to 2 significant figures. *39‚501 -> 4.0 x 10 *0
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social class‚ ranking‚ confidence and appeal. Clothes protect us from the weather and provide us with warmth and cover. Clothes also make us are more beautiful and prominent than in the eyes of other people. In our lives‚ the clothes have a huge impact on how others perceive us and how we perceive others. We choose topic about the clothes‚ because we want know importance of the clothes with everyone and the advantages and disadvantages of clothes bring for people‚ so we choose this topic‚ and
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known as a scientific A) theory. B) law or principle. C) hypothesis. D) fact. E) none of the above 2) 3) For a scientific hypothesis to be valid‚ there must be a test for proving it A) right. B) wrong. C) conclusively one way or the other. 3) 4) Pseudoscience is best characterized as being A) an alternate view to be taken seriously. C) fake. 4) 5) B) new age. D) all of the above If a cube of jello is cut into two pieces‚ what total property of the new pieces change
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Definition of Measurement Measurement is the process or the result of determining the ratio of a physical quantity‚ such as a length‚ time‚ temperature etc.‚ to a unit of measurement‚ such as the meter‚ second or degree Celsius. The science of measurement is called metrology. The English word measurement originates from the Latin mēnsūra and the verb metiri through the Middle French mesure. Reference: http://en.wikipedia.org/wiki/Measurement Measurement Quantities *Basic Fundamental Quantity
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well we are going over scientific notation‚ and significant figures C- Well (states the rules for sig figs) Zeros may or may not be significant. They are significant when between nonzero digits‚ and when at the end of a number that includes a decimal point. They are not significant when before the first nonzero digit‚ and when at the end of a number without a decimal point. Now for nonzero digits. All nonzero digits in a number are considered significant. For example 4.013 has four sig figs. 900.2 has
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precise than Andrew’s. b) Brian’s balance is more accurate than Brenda’s. What important characteristics of the four balances are implied by these statements? Give examples. Andrea will be able to read her balance to a greater number of significant figures than Andrew since her balance is more precise. Her successive measurements will also be less variable than Andrew’s measurements. Ex. If three measurements are taken by Andrea (1.7 mL‚ 1.7 mL and 1.8 mL) we know that her spread in measured
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Balance Lab Worksheet Measurement * Measurement is an important skill used for data collection and data analysis. Careful attention to the accuracy and degree of uncertainty of each measuring device is necessary for proper data collection. Significant figures are used to record or report measurements accurately. * This laboratory activity will give you the opportunity to get more familiar with some of the basic measuring devices that are common in chemistry labs. You will use the measurements
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(Dot Points) Examples 5A Scientific notation (Standard Number): Conversions and Calculations 1. Scientific notation is used as a shorthand way of writing very large and very small numbers. 2. The decimal point is placed after the first significant figure‚ and then this decimal is multiplied by the appropriate power of 10. 3. The power of 10 is found as follows. • If the decimal point is moved left (for large numbers)‚ the power of 10 is the number of places moved left. • If the decimal
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Question 1 1 out of 1.25 points Partial Credit Expand the following by showing the powers of 10 for each place value. 456 = 4 x 10[a] + 5 x 10[b] + 6 x 10[c] 87.045 = [d] x 101 + [e] x 100 + [f] x 10-1 + [g] x 10[h] + 5 x 10[i] 700 = [j] x 102 + 0 x 101 + 0 x 100 Specified Answer for: a 2 Specified Answer for: b 1 Specified Answer for: c 0 Specified Answer for: d 8 Specified Answer for: e 7 Specified Answer for: f 0 Specified Answer for: g 4 Specified
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