CHEM 103 quiz 1 study guide

Using a 1 cup measure from a home kitchen (which has the information "1 cup or 240 mL" stamped on the bottom) and a kitchen scale, a student determines that a cup of water at 22 °C has a mass of 239 grams. The next day in lab, the same student uses a laboratory balance and a graduated cylinder and finds the mass of 10.00 mL of water, also at 22 °C, to be 9.978 g. From this information, the student calculates the density of water using d=m/v. Below are the images she sees when she calculates the densities on her phone's calculator. (m = 239 g v = 240 mL) (m = 9.978 g v = 10.00 mL) Displayed answer = 0.99583333 Displayed answer = 0.9978 Which of the following is the most correct way of reporting her results? (Hint: This question is about significant figures!)

Density (home) = 1.0 g/mL. Density (lab) = 0.9978 g/mL.

T or F? After working up your data from lab, you obtain the plot below. Before proceeding further, you should remove the red data point because it clearly has an error associated with it.

False

T or F? All online homework (through the OWL system) is due on Mondays at midnight

False

T or F? If you are working with a friend on a homework assignment, it is ethical to each solve half the problems, then give each other the answers and only go over questions that don't seem clear.

False

As temp increases, salt becomes more/less soluble?

More

Which of the following statements is true? 1 km3 = 1,000 m3 1 km3 = 1,000,000 m3 1 km3 = 10,000,000 m3 1 km3 = 100,000,000 m3 1 km3 = 1,000,000,000 m3

1 km3 = 1,000,000,000 m3

Which of the following statements are FALSE? (Please choose all that apply.) An object with a 100-pm radius would be observable without any magnification. An object with a 100-mm radius would be observable without any magnification. There are 1,000,000,000 nanometers in one meter. There are 10-3 mL in 1 L. There are one million micrograms in a gram.

An object with a 100-pm radius would be observable without any magnification. There are 10-3 mL in 1 L.

Quantiatively describe the change in the salt's solubility as the solution is heated from 10 degrees celsius to 60 degrees celsius.

As the solution is heated from 10 deg celsius to 60 deg celsius, the salts' solubility increases from approx. 15g/100g of water to approx 65g/100g water, approx 50g/100g water total increase.

T or F? If you provide your friend with help on a quiz or exam, you are not committing academic misconduct because your grade is not directly benefitting from this interaction. You are only providing help.

False

T or F? When completing a lab report, I can use whole or partial sentences from the lab manual without citing the lab manual as a source, because these are not copyrighted.

False

T or F? You will get to drop your lowest lab score

False

The following scenarios describe common choices students face while analyzing lab data. Select the ethical, acceptable actions. Referring to a lab notebook from a previous year, just as reference, because the particular activity has been slightly revised since last year Talking with another pair in lab, then taking what I have learned and using that knowledge (in my own words) in our group report Looking up thermodynamic data in my e-text that is relevant to the lab Asking a classmate from an earlier lab time for observations so that I can get a jump on completing my lab notebook

Talking with another pair in lab, then taking what I have learned and using that knowledge (in my own words) in our group report Looking up thermodynamic data in my e-text that is relevant to the lab

Which acts below are considered to be academic misconduct? sneaking out of lecture 15 minutes early every day using a pencil to write in your laboratory notebook taking another student's lab report from the report pile and hiding it in the trash can fabricating a data point that you forgot to measure in the laboratory doodling in your notebook rather than participating during discussion section taking credit for the work or effort of another person without permission or citing the source

taking another student's lab report from the report pile and hiding it in the trash can fabricating a data point that you forgot to measure in the laboratory taking credit for the work or effort of another person without permission or citing the source

Please select the numeric value that makes this statement true: 1 centimeter = ____________ kilometers.

10-5 km

The density of benzene at 15 °C is 0.8787 g/mL. Calculate the mass of 0.1500 L of benzene at this temperature. Enter your answer in terms of grams, but do not include units in the blank.

131.8

How many significant figures will there be in the answer to the following calculation? (10.00 x 34.1) / (0.0012 x 2.5469)

2 sig figs

The recommended dietary allowance for calcium is 162 mg. 1 serving of fortified orange juice has a volume of 240 mL. One serving contains 35% of RDA for calcium. If OJ is your only source of calcium, determine the volume of OJ you should drink per day.

690 mL oj

T or F? 2.41 nm = 2.41x10^-3 micrometers

True

T or F? I cannot use text directly from the lab manual when writing the Procedure section of a lab report. Instead, I must paraphrase the text, focusing on the important steps in the experimental prodecure.

True

T or F? If your friend asks you for help on a quiz, then they are committing academic misconduct.

True

T or F? Keys to the week's discussion activities + quizzes are posted online on Fridays at 6 pm

True

T or F? Use piazza to ask all questions about course policies + chemistry content

True