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8090 [49]
3 years ago
6

Malia is interested in observing cognitive development in children and wants to design a study that will allow her to observe sm

all changes in how 6-year-olds learn to solve problems. She plans to collect data from each child every week for three months.
Which design is her best choice?

A] microgenetic
B] cross-sequential
C] cross-sectional
D] longitudinal
Chemistry
1 answer:
jarptica [38.1K]3 years ago
8 0

Answer: Microgenetic

Explanation: I just took the test :3

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A sample of an unknown compound has a percent composition of 52.14% carbon, 13.13% hydrogen, and 34.73% oxygen. Which compounds
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<h3>Answer:</h3>

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                            1) Dimethyl Ether H₃C--O--CH₃

                           2) Ethanol  H₃C--CH₂--OH

<h3>Solution:</h3>

Step 1: Calculate Moles of each Element;

                      Moles of C  =  %C ÷ At.Mass of C

                      Moles of C  =  52.14 ÷ 12.01

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                      Moles of H  =  %H ÷ At.Mass of H

                      Moles of H  =  13.13 ÷ 1.01

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                      Moles of O  =  %O ÷ At.Mass of O

                      Moles of O  =  34.73 ÷ 16.0

                      Moles of O  =  2.170 mol

Step 2: Find out mole ratio and simplify it;

                C                                        H                                     O

            4.341                                 13.00                              2.170

     4.341/2.170                      13.00/2.170                    2.170/2.170

               2                                      5.99                                    1

               2                                        6                                       1

Hence,  Empirical Formula  =  C₂H₆O

<h3>Result:</h3>

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they showed mandeleeves predictions were correct

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