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In performing any laboratory experiment, what is the first step performed out of the following choices? a) collect data b) analyze data c) publish results d) form hypothesis
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As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit
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All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice
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Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas
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In performing any laboratory experiment, what is the first step performed out of the following choic...
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