Ch 11 Mock Exam Solutions

4 Chemistry is the science of the structure and interactions of matter. The INCORRECT alternative is: D) All living and nonliving things consist of matter, which is anything that occupies space and has mass. Mass is the amount of matter in any object, which does not change. Weight, the force of gravity acting on matter, does change. When objects are farther from Earth, the pull of gravity is strong; this is why the weight of an astronaut is close to zero in outer space.   5. Structure of Atoms: each element is made up of atoms, the smallest units of matter that retain the properties and characteristics of the element. Is CORRECT to affirm that: B) One subatomic particle composed of individual atoms. Only three types of subatomic particles are important for understanding the chemical reactions in the human body: protons, neutrons, and electrons. The dense central core of an atom is its nucleus. Within the nucleus are positively charged neutrons (p+) and uncharged (neutral) protons…

Unit conversions

B

7. Air has a density of 0.001226 g/mL. What volume of air would have a mass of 1.0 lb? (1.0 Ig = 454 g) %3D A) 3.7 ml B) 7 mL C) 815.6 mL D) 37 mL E) 3.7 x 105 mL O a O b O c d.

The Deepwater Horizon oil spill released approx. 35000 barrels of crude oil per day into the Gulf of Mexico for 87 days. An oil barrel is defined as 42 gal. a. Calculate the rate of crude oil released in L/hour. (Assume 24 hr in one day.) b. A case of water at a local "warehouse store" contains forty (40) 500. mL bottles. The total volume of the Deepwater Horizon oil spill was equivalent to how many cases of water?

A car’s rate of fuel consumption is often measured in miles per gallon (mpg). Determine the conversion factor between miles per gallon and the SI unit of meters per cubic decimeter (1 gallon =3.785 dm3 , and 1 mile = 1609.344 m).Express 30.0 mpg in SI units.

Part 7) Looking towards summer, pretend for a moment that you won a scooter. You are so excited to ride the mean streets of Almaden all summer! You have a choice of fuels that the scooter will use, but you have a budget and want to know which fuel will allow you to travel the most miles per 1.000 L. First calculate the mass of your scooter (250 pounds) and yourself together = 350 pounds Based on that mass, and how much theoretical energy you calculated from 1.000 L of fuel, how far could you go with maximum efficiency?

1.    In your pharmacy you have a balance with a sensitive requirement of 7mg; 10,25,50 and 100ml graduated cylinder; and 1 oz apothecary and 4-ounce apothecary conical cylinder. What is the minimum measurable volume in ml using the graduated cylinder?a.    5b.    20c.    1d.    2

for forensic chemistry :  If a vehicle with four wheels is traveling in a linear path through soft dirt, how many and which tires would you expect to leave tire track impressions?

Suppose some measurements are made on two different homogeneous stones to find out if they are made of the same kind of rock. The mass and volume measurements are listed below. Are the two stones the same type of rock? Why or why not? Show all calculations. Mass Volume Calculations Stone 1 58.0 g 20.0 cm Stone 2 50.1 g 15.0 cm3 21/common/assets/pdfjs/1.0.0.30/web/viewer.ht...ndered-pdf&fullscreen=Dd21-fileviewer-rendered-pdf-dialog&height=746#0

The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 90% confident that his estimate is within eight percentage points of the true population percentage? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of adults who have heard of the brand. (Round up to the nearest integer) b) Assume that a recent survey suggests that about 80% of adults have heard of the brand. (Round up to the nearest integer)

3. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is a. 500 mg​​ b. 250 mg c. 60 mg 4. The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%

II. BOILING POINT ELEVATION: The temperature of a boiling 50 mL of distilled water in an Erlenmeyer flask with a small flame was taken to be 98°C. The bulb of the thermometer must not touch the bottom or sides of the Erlenmeyer flask. In another Erlenmeyer flask, 2.83 grams of urea is dissolved in 10 grams of distilled water. The solution was let to boil gently and its boiling point was recorded to be 101°C. DATA AND RESULTS: (Show all pertinent computations on the space provided if applicable. Answers with no computation will not be considered.) Mass of urea in grams Mass of water in grams Boiling point of distilled water in degrees Celsius Boiling point of urea solution in degrees Celsius Molecular weight of urea in g/mol (experimental) Molecular weight of urea in g/mol (calculated) Percent Error of Molecular weights of urea Change in boiling point SOLUTION/S:

Blood alcohol content is a measure of alcohol in the blood as a percentage. It is calculated in grams per 100 mL of blood, so a BAC of 0.08 means your blood is 0.08% alcohol by volume. what is the total mass of alcohol (in grams) that is present for the same adult male whose total blood volume is 5.6L?

Can you please set up the conversions based on the format in the picture

3

Best fit line? R^2 value? Density of water?

While creating a piece of art work, a student becomes curious about the ink he is using to create his art. He wonders if the in is a pure substance or a mixture. The ink appears to be uniform throughout, but separates when a chromatography experimer is performed on it, leaving multiple marks of different colors along the chromatography paper. Using his observations of the properties of the ink, the student can classify it as a heterogeneous mixture. solution. compound. element.

CHEMISTRY Calculating Density Density is the compactness of matter. Density describes the quantity of matter (mass) per unit of volume (3-dimensional space). Density is calculated as the mass of the matter divided by volume. The symbol for density is Greek letter rho (p). The units for mass are in grams (g) and the units for volume is cubic centimeter (cm³). It should be noted that 1 cm³ is equal to 1 ml of volume. 1 cm³= 1 ml. The units for density are g/cm³. Part 1 Determine the density of the new liquid materials created in the Secret Density Research Laboratory. Type the value (no units) of the density into the boxes in the density column. Report density to the 2nd number after the decimal. Use a zero to the lef of the decimal for values less than 1.00. Examples: 2.35, 0.75, 1.90 Material name Harrisonite Waltonium Kellese Wheelernone Osborneum Popebrillium Mass (g) 430 590 260 m P=V 620 380 510 Volume (cm³) 537 454 236 364 633 340 Density (g/cm³) SAMSUNG

2. A nurse measured the average heart beats of a patient and reported to the doctor in terms of time period as 0.8s. Express the heart beat of the patient in terms of number of beats measured per minute.

11. Billy is running away from a Wells Fargo bank at a speed of 13 kilometers per hour (units are km/h). If the distance between the bank and the border to Mexico is 1.9 km, will he be able to get there before the cops arrive in 9 minutes? How long will it take for him to reach the border? (Hint: speed = distance / time, 1 hour = 60 minutes)

In all volumetric glassware (e.g., pipet, buret, volumetric flasks, graduated cylinder, etc.), it is necessary to read the level of a liquid. A liquid in a small-diameter container will form a meniscus or curve at the surface of the liquid. How would you properly read the volume of the liquid in volumetric flasks and transfer pipets? In graduated cylinders?

Part 3: Calculate density of a metal an unknown metal. 1. Using the pictures below, record the displayed data in the data table in the report sheet. Make sure to include the right number of significant figures in the measurements and calculations. Mass measurement 7.1 g Volume of water measurement. There's only one measurement here – the larger image is for magnification only. -20 15 m Volume of water and metal measurement. There's only one measurement here – the larger image is for magnification only. 20 m 15

8. L0s t213.15= 318.18K 2. A woman is 5 ft 5 in tall and weighs 140 lb. Express these values in the SI system (m, kg)

Nanotechnology, the field of building ultrasmall structures one atom at a time, has progressed in recent years. One potential application of nanotechnology is the construction of artificial cells. The simplest cells would probably mimic red blood cells, the body’s oxygen transporters. Nanocontainers, perhaps constructed of carbon, could be pumped full of oxygen and injected into a person’s bloodstream. If the person needed additional oxygen—due to a heart attack or for the purpose of space travel, for example—these containers could slowly release oxygen into the blood, allowing tissues that would otherwise die to remain alive. Suppose that the nanocontainers were cubic and had an edge length of 25 nanometers. What is the minimum number of nanocontainers that a person would need in his bloodstream to provide 1 hour’s worth of oxygen?

An object with sg object = is floating on a certain liquid with sg liquid- If the volume of the object above the liquid is 950 cu.m. what is the total volume of the object in cu.m? Sg object = 0.91 Sg liquid = 1.06 O 10766.67 O 8895.45 O 6713.33 O 10977.78

Show calculatons in a easy way.