One student did an experiment with an unknown mineral. the hardness scale shown below was used for the experiment.
mineral talc gypsum calcite fluorite apatite orthoclase
hardness 1 2 3 4 5 6
any mineral on the hardness scale would scratch minerals below it on the scale. the student tested the unknown mineral against calcite, but neither mineral scratched the other. which of these is a correct conclusion the student can make about the unknown mineral?

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

Which statement best describes a typical difference that could be found between the "analysis" and "conclusion" sections of a lab report? a) only the "conclusion" describes errors that occurred during the experiment, and only the "analysis" section suggests further research.b) only the "analysis" section includes specific data comparisons, and only the "conclusion" section suggests further research.c) only the "analysis" section discusses whether the original hypothesis was supported, and both sections include graphs of data.d) only the "conclusion section discusses whether the original hypothesis was supported, and both sections suggest further research.(the answer is b i just took the test)

Me the formula cacl2 represents the compound