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…

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Dashboard My Home OWLV2 | Online teaching and learning resource from Cengag [References) A student gently drops an object weighing 15.7 g into an open vessel that is full of ethanol, so that a volume of ethanol spills out equal to the volume of the object. The experimenter now finds that the vessel and its contents weigh 10.6 g more than the vessel full of ethanol only. The density of ethanol is 0.789 g/cm°. What is the density of the object? Density = g/cm³ Submit Answer Try Another Version 10 item attempts remaining

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The speed of light is 3 x 108 m/sec Assume: 1.6 km/mile 1.If the earth is close to Mars, we are roughly 50 million miles apart. How many minutes will it take for us to communicate with astronauts on Mars? 2.When we are at opposites in our orbits, we are close to 200 million miles apart. How many minutes will it take for us to communicate with astronauts on Mars?

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.

13. The speed of a particular automobile is 45 mph (miles per hour). Use the following relationships to calculate the value in units of km/s (kilometers per second). 1 km = 0.62 mi 1 h = 60 min 60 s = 1 min %3D 14 Na me the following ooidle ond h0808 ond idontifu on i

EJIYZPROfspoHcK3uA&lv=HbAhnaEn7foZmyeo a hjkml,/t[plkojihug. N Nitro Type | Compe.. E 3:28 Now playing. e QBA2 2020-2021 DO 12 13 14 15 16 17 18 19 20 21 21 of 21 Raymond went to the grocery store with his mom. He started by pushing an empty grocery cart with 0 kg of mass. As the shopping trip progressed, the cart increased in mass from 0 kg to 10 kg. Which argument below supports Raymond's claim that it was more difficult to push the 10 kg cart as opposed to the empty cart. O As the cart decreased in mass, Raymond had to use more force to push the cart. O As the cart increased in mass, Raymond had to use more force to push the cart. O As Raymond continued to push the cart during the duration of the trip, he became tired which made it more difficult to push the cart. O As Raymond continued to push the cart during the duration of the trip, friction began to build up on the wheels causing the cart to be more difficult to push.

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

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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%

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

O Macmillan Learning One important test for kidney disease involves measuring the levels of bicarbonate (HCO,) in blood. Normal bicarbonate levels for a person ranging in age from 18 to 59 years old is 23-29 mmol/L. A lab purchased a new instrument to measure bicarbonate levels in blood and needs to certify it against their current instrument. The bicarbonate levels in the blood of a 38 year old woman was measured using the old and new instrument. The blood was tested 6 times using each instrument. The mean concentration of bicarbonate using the old instrument was found to be 24.4 mmol/L. with a standard deviation of 1.54 mmol/L. The new instrument yielded a mean concentration of 25.5 mmol/L with a standard deviation of 0.48 mmol/L... Determine if there is a significant difference in the standard deviations of the two sets of measurements made by the two instruments at the 95% confidence level. Determine the value of Fale Feale= 10.293 Determine the value of Fuble- Refer to the table…

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)

As viewed from Earth, most stars appear to move across the sky each night because A stars orbit around Earth   B Earth rotates on its axis   C stars revolve around the center of the galaxy   D Earth revolves around the sun

Run a simulation to determine if buying 23 boxes is unusual

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)