Sig figs example - Study guides, Class notes & Summaries

AQA AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Mark scheme June 2022. MARK SCHEME – AS CHEMISTRY – 7404/2 – JUNE 2022 Organic names As a general principle, non-IUPAC names or incorrect spelling or incomplete names should not gain credit. Some illustrations are given here. Unnecessary but not wrong numbers will not be penalised such as the number ‘2’ in 2- methylpropane or the number ‘1’ in 2-chlorobutan-1-oic acid. but-2-ol should be butan-2-ol 2-hydroxybut...

Aliquot - Answer- - *Portion of measurement added* - Example: "In this experiment, we will be using an *aliquot* of 10 mL of water for each trial Sig Fig Rules (Significant) - Answer- - Any non-zero digit is a sig fig - Zeros between non-zeros are sig figs - Zeros to the right of the last non-zero digit are sig figs Sig Fig Rules (Insignificant) - Answer- - Zeros to the left of the first non-zero are NOT sig figs Calculations Rules for Sig Figs (+/-) - Answer- - Focus on decim...

Aliquot - Answer- - *Portion of measurement added* - Example: "In this experiment, we will be using an *aliquot* of 10 mL of water for each trial Sig Fig Rules (Significant) - Answer- - Any non-zero digit is a sig fig - Zeros between non-zeros are sig figs - Zeros to the right of the last non-zero digit are sig figs Sig Fig Rules (Insignificant) - Answer- - Zeros to the left of the first non-zero are NOT sig figs Calculations Rules for Sig Figs (+/-) - Answer- - Focus on decim...

Chemistry Final ACS Exam 75 Questions with Verified Answers Accuracy? - CORRECT ANSWER Closeness of measurements to the TRUE VALUE of what is being measured Precision? - CORRECT ANSWER Closeness of a SET of measurements How do you calculate Percent Error? - CORRECT ANSWER I experimental-accepted I ____________________ x 100 accepted value Are zeros infront of non-zero digis significant? - CORRECT ANSWER Nope! ex: 0.0071 is only 2 sig figs Are zeros at the end of a number and...

Chemical properties Chemical properties describe the characteristic ability of a substance to react to form new substances. Physical properties Physical properties are characteristics that can be measured without changing the composition of the sample under study Elements contain only one type of atom Mixtures contain more than one type of molecule Compounds Contain more than one type of atom, but only one type of molecule Heterogeneous Mixtures mixtures that are not uniform and so di...

C125 MIDTERM EXAM QUESTIONS AND ASWERS If 11.3 g of NaCl is dissolved in 100. g of water, what is the percent by mass (mass%) concentration of NaCl in the solution? Note: 1. Use three sig figs for your final answer. 2. Do not enter your answer as fractions. For example, if you think 30% is the correct answer, enter either "30" or "30%". Do NOT enter "0.30". - Answer- 10.2 How many moles of NaOH will be needed to neutralize 0.86 mol of H2SO4? The following equation is NON-bal...

Rearrange the following equation to solve for V. (P+a)(V-b)=nRT - Answer- V= (nRT/P+a) +b In an experiemnt, the best-fit-line equation between Absorbance (A, unitless) and concentration (c, mg/mL) is used to calculate the concentration of Fe. Based on the best-fit line equation given below, what is the concentration of Fe if the absorbance is 1.25? A = 851 c + 0.03 - Answer- 0.0014 In y=kx + b, b is - Answer- y-intercept All of the following numbers have three sig figs EXCEPT: 1...

The lines observed in H-lamp are parts of Balmer Series. All these lines are due to a transition from various higher n value to a common n. What is this common lower n value for all these lines? - Answer- 2 The bright violet line of Hg lamp has a wavelength of 435.8 nm. What is the energy of the photon associated with this emission line? - Answer- 4.56*10^-19 J Given: In Atomic Spectra lab, a student obtained his best-fit line equation to be y = 0.29 x + 46.8 when he plotted his Vernier re...

Accuracy? - answer-Closeness of measurements to the TRUE VALUE of what is being measured Precision? - answer-Closeness of a SET of measurements How do you calculate Percent Error? - answer-I experimental-accepted I ____________________ x 100 accepted value Are zeros infront of non-zero digis significant? - answer-Nope! ex: 0.0071 is only 2 sig figs Are zeros at the end of a number and to the right of the decimal significant? - answer-Yep! ex: 9.100 is 4 sig figs Addition/S...

What is the height of a 6 m building in centimeters? - Answer-600 cm A balance is used to measure...? - Answer-mass A sample of bismuth has a mass of 7872 g and a volume of 1.64cm3. WHat is the density of bismuth? - Answer-4.80x10cubed g/cm cubed A measurement is said to have high accuracy if it ... - Answer-agrees closely with the accepted standard Number of sig figs in 0.000305? - Answer-3 (1.5560x 10 to the -6) x (7.9860x 10 to the 13th) Don't forget about sig figs. - Answer-1...