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Questions in chemistry

[Terjawab] A. Thermal decomposition of 2.765 g NaHCO\(_3\) yields 1.234 g of solid Na\(_2\)CO\(_3\). Calculate the theoretical yield and percent yield of Na\(_2\)CO\(_3\). B. Thermal decomposition of 2.968 g of a mixture containing NaHCO\(_3\) lost 0.453 g. Calculate the percentage of NaHCO\(_3\) in this unknown mixture.

[Terjawab] Sequence the following types of waves from lowest frequency to highest frequency: - Radio waves - Infrared rays - Green light - Ultraviolet rays - Gamma rays

[Terjawab] Which layer of the Earth can only be studied by indirect means?

[Terjawab] Suggest two reasons why copper should not be disposed of in landfill sites.

[Terjawab] During the action of a sodium-potassium pump, 50 ATP molecules are spent. Predict how many sodium ions are transported across the cell membrane. A. 50 B. 100 C. 150 D. 200

[Terjawab] Stella has poured 3 cups of water into a 1-L soda bottle. She then sealed the bottle and placed it in the sunlight. What natural process can Stella study with the model she built? A. Nitrogen cycle B. Rock cycle C. Carbon cycle D. Water cycle

[Terjawab] Which electron transition involves the most energy?

[Terjawab] A solution that has a relatively large quantity of solute dissolved in the solvent is: A. heterogeneous B. dilute C. dissociated D. concentrated Please explain the answer.

[Terjawab] According to early chemists, which substances were classified as elements? A. Those that could not be broken down further by physical means. B. Those that could not be broken down further by chemical means. C. Those that had higher numbers of protons in their atoms. D. Those that had an atomic mass that could be measured.

[Terjawab] In Chemistry, in the following type of shorthand, what does the number next to the element name mean? Hydrogen-3