Safety & Scientific Method Assessment

Estimated volume of crucible 25.0 mL  measured volume of crucible 23.0 mL  percent error of estimate (% error=accepted value-experimental value/accepted value ) volume in (used measured volume of crucible) kL cL

Calculate the percent error. true value- 0.100 experimental value- 0.096

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Please help with questions 2 & 3

Answer the following questions._____1. Which of the ff you can use for mixing liquids?a) test tube brush b) stirring rod c) analytical balance d) iron clamp_____2. Which of the ff you can NOT use to measure liquids?a) beaker b) serological pipet c) graduated cylinder d) volumetric pipette_____3. It can be used to contain samples for heating with flames >400 °Ca) test tube b) O-ring c) Bunsen burner d) crucible with cover_____4. The ff can be used for boiling a solution of salt, EXCEPTa) beaker b) Bunsen burner c) Buchner funnel d) Wire gauze____5. Which of the should be used when you want to separate OIL and WATER?a) buret b) separatory funnel c) buchner funnel d) Pasteur pipette

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Increasing the number of measurements will decrease the standard deviation increase the systematic error increase the random error a) 1 & 2 b) 1 only c) 2 & 3 d) 2 only e) 1, 2, & 3

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3) For the results, discuss the significance of the following in terms of accuracy or precision: a) Deviation vs Absolute Error. b) % Error vs Standard Deviation.

Please answer the following question:  data attached if needed

A standard deviation of 0.044 is a good thing or a bad thing?

2a. Volume in graduated cylinder , indirect method - volume of a 400mL Beaker(2 methods) measure in to the 10ths place. Fill#1/Fill#2/Fill#3/Fill#4/Fill#5/= Total Volume . 2b. Direct Method ( use formula for the volume of a cylinder):V=nr(2)h {show work} Radius/ height/ n-3.1415/ Volume (n r2 h)

help please answer in text form with proper workings and explanation for each and every part and steps with concept and introduction no AI no copy paste remember answer must be in proper format with all working!

TRUE OR FALSE __________ 6. The bowl of the funnel for gravity filtration may be filled to the brim. __________ 7. Transfer liquids and solutions from a reagent bottle or beaker with the aid of a stirring rod. __________ 8. Never touch, taste, or smell a chemical unless specifically told to do so. __________ 9. If uncertain as to how to dispose of a chemical, dumping it into the sink followed by copious amount of water is a safe disposal procedure. __________ 10. A centrifuge machine should be balanced with an even number of centrifuge/test tubes, placed across the rotor from one another, with equal volumes of liquid.

TRUE OR FALSE 1. Examples of personal protective equipment includes lab coats, long pants, closed shoes and prescription glasses. __________ 2. Thick calibrated glassware like graduated cylinders and volumetric flasks can be heated directly and will not break easily. __________ 3. Larger spills of hazardous liquid on the skin and clothes require immediate use of safety shower. __________ 4. If you get chemicals in the eye, you should flush them with water for 5 minutes only. __________ 5. Flammable materials, like alcohol, should never be dispensed or used near an open flame.

Please help with question 5