Twenty fluorescence spectra were signal averaged to yield a resulting spectrum with a signal/noise ratio of 30: 1. how many spectra would you need to acquire and signal average in order to attain a signal to noise ratio of 100: 1? put minimum number needed

Will give brainliest it is a lab from k12 here is the linkfor each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. type your answer here. (score for question 3: of 5 points) were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. type your answer here. (score for question 4: of 5 points) make a general statement about the reactivity of the metals in this experiment. type your answer here.

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.