exam1a with ans

Can you help me answer this questions 4 and 5, this is from the previous question I just split my question, thanks

for the first box the options are 1, 2, 3, 4, 5  for the second box the options are 1, 2, 3, 4, 5  for the thrid box the options are 2, 3, 4, 5, 6, 7, 8, 9, 10

[H3O+] = 1 x 10-4M Express your answer using one decimal place.

Why should the selected rule(s) be followed? Weighing wet items will cause the displayed mass to be greater than the actual mass of the object. A residue left on the balance will contaminate the balance pan surface and anything that comes into contact with it afterwards. Objects at any temperature other than room temperature can create air currents which can affect the balance pan, causing the measured mass to be higher or lower than the true mass. There may be discrepancies in accuracy between individual balances.

Write numbers using scientific notation. (a) Write the following numbers in scientific notation using E-notation. Example: Enter 1.20E-4 for 1.20x10-4 Write each number to two decimal places with one non-zero digit before the decimal point. Example: Use 1.20E-4 NOT 0.120E-3 or 12.0E-5 (i) 0.0661 (ii) 3410 (b) Write the following numbers in standard notation. Do not include a decimal point for numbers greater than 1. Include a zero before the decimal point for numbers less than 1. (i) 3.13×104 31300 (ii) 1.13x10-4 31300 Check & Submit Answer Show Approach

An electric current of 485.0 mA transports 760. uC of charge. Calculate the time this took. Be sure your answer has the correct unit symbol and 3 significant digits. x10 ロ・ロ X μ 3 5

(0.0041×20000.0)+(2817×14). Express your answer to the appropriate number of significant digits.

I don't understand the wording. The least significant digit means the last digit?  7.700 X 2.1 = 16.17     would the uncertainty be  0.01 ? 2.132 + 17 + 4.04 = 23.172   would the uncertainty be 0.001 ?

A Exercise 8.40: Problems - Mass-to-Mass Conversions Consider the following balanced equation for the combustion of butane, a fuel often used in lighters. 2 C4H10 (9) + 13 02 (g) 8 CO2 (g) + 10 H20 (g) Complete the following table, showing the appropriate masses of reactants and products. If the mass of a reactant is provided, fill in the mass of other reactants required to completely react with the given mass, as well as the mass of each product formed. If the mass of a product is provided, fill in the required masses of each reactant to make that amount of product, as well as the mass of the other product that is formed. Mass C4 H10 Mass O2 Mass CO2 Mass H2O 1.11 g 5.72 g 18.12 g 9.64 g 192 mg 168 mg

Suppose you were measuring out an organic liquid, and some of it is evaporated after you have performed the volumetric measurement while you are weighing out the sample. What effect would this have on the densities you calculated? Will you overestimate or underestimate the density of the liquid? Would this cause poor accuracy, low precision, or both? Explain briefly.

part A: Sort the following numbers according to whether they should be rounded up or down when rounding to the nearest tenth (the first digit after the decimal).   3.1760, 4.319, 19.47, 5.82, 66.9214, 8878.2010, 7.084, 124.76   part B: Drag the answers that have been correctly rounded to the appropriate number of significant figures to their place in the table. To avoid rounding errors, start with the unrounded value before conducting each manipulation. Drag the appropriate labels to their respective targets. View Available Hint(s)for Part B     Reset Help   14.93 Group 3 14.93 12 Group 1 12 14.92 Group 3 14.92 3.62 Group 4 3.62 14 Group 3 14 3.7 Group 4 3.7 15 Group 3 15 3.6 Group 4 3.6 15.0 Group 3 15.0 3.63 Group 4 3.63 14.9 Group 3 14.9 3.623 Group 4 3.623 12.47 Group 1 12.47 7.97 Group 2 7.97 12.46 Group 1 12.46 7.966 Group 2 7.966 12.4 Group 1 12.4 7.0 Group 2 7.0 13 Group 1 13 7.96 Group 2 7.96 12.5 Group 1 12.5 8.0 Group 2 8.0 3.622 Group 1…

between significant digits are always significant. figures. Example: 5,007 has 4 significant figures. 3) Trailing zeros in a number are significant only If the number contalns a decimal polnt. Example: 100.0 has 4 significant figures. 100 has 1 significant figure. 4) Zeros in the beginning of a number whose only function Is to place the decimal polnt are not significant. Example: 0.0025 has 2 significant figures. 5) Zeros following a decimal significant figure are significant. Example: 0.000470 has 3 significant figures. 0.47000 has 5 signlficant figures. Determine the number of significant figures in the following numbers. 1. 0.02 6. 5,000. 4. 2. 0.020 2. 7. 6,051.006 3. 501 3 8. 0.0005 1. 4. 501.0 9. 0.1020 5. 5,000 10. 10,001 5 Determine the location of the last significant place value by placing a bar over the digit. Example: 1.700) 9,010.0 4.7x10-8 10,8 00,000 3.0Tx 1021 0.00410 1. 8040 6. 90,100 0.0300 699.5 2,000X162 0.90100 2. 0.0300 7. 4.7 x 108 3. 699.5 8. 10,800,000. 3.…

graduated cylinder weighs 35.825 g. When 10 mL of water is measured in it, the weight of the graduate and water is 45.835 g. Calculate the weight of the water, and express any deviation from 10g as percentage of error.

I am told that when determining the number of significant figures, if the decimal place is absent, then you start counting from the first nonzero number on the right side and continue counting to the left until you reach the last digit. However, if the decimal place is present, start counting the first nonzero number from the left and continue counting to the right until the final digit has been reached. For example, the number 50 only has two significant figures, while the number 50.00 has four significant figures. However, how does the number 50 have two significant figures? If I have to start countingfrom the right because of the absence of a decimal place, and I have to begin with the first non zero number, I would have to start from 5 and there is nowhere to count further to the left. How does the number 50 have two significant figures?

Compute (4.29 x 105) · (1.89×10-4). Express your answer to three digits.

What is the percentage uncertainty with the following measurement 0.100 ± 0.005 g? Provide your answer to one decimal point.

Find the difference between the value of x2 and the sum of x1 plus x3.; let x4 be equivalent to the sum of x1 and x3 and let x5 be the difference between x2 and x5. This calculation scheme is shown below. Make notes about any similarities or differences between the values in your notes.  x4 = x1 + x3 x5 = x2 – x4  Data Analyis  This section will include all data collected during the lab.    Thermochemical Data    Tinitial (°C)  Tfinal (°C)  ΔT (°C)  moles NaOH  qreaction (kJ)  ΔHrxn  Reaction 1  25.0    30.3    +5.3    0.025  -1.11    -44.4  Reaction 2  25.0    37.0    +12.0    0.025  -2.51    -100.4  Reaction 3  25.0    31.7    +6.7    0.025  -1.40    -56.1    Reaction 1: NaOH(s) → Na+(aq) + OH-(aq) + x1 kJ  1g /39.977g/mol = 0.025 moles  Moles NaOH = 0.025  qsolution = (4.184 J/g °C) (50.0g) (30.3°C -25.0°C)  = -1108.76 J/ 1000  qreaction (kJ) = -1.11 kJ   ΔH = -1.11 kJ/ 0.025 moles  ΔHrxn = -44.4 kJ/mol…

I need the answer as soon as possible

Use the data set below to answer the following question. This is a fictitious data set, so no units are listed. Data Set 282 294 270 276 232 295 For the data set above, the Q-test suspect value is type your answer. and based on the statistics you can choose your answer. that value with 90% confidence.

Please send me the question in 20 minutes it's very urgent plz

Evaluate 6×0.222×7.0 and round the answer appropriately. Express your answer numerically using the appropriate number of significant figures.     Part B Evaluate 0.411+9.9+0.8 and round the answer appropriately. Express your answer numerically using the appropriate number of decimal places.   Part C Evaluate 16.83 over 15 −0.46 and round the answer appropriately. Express your answer numerically using the appropriate number of significant figures or decimal places.