SCIN131-Introduction to Chemistry-APUS-Lesson 1 Assignment

Part 1 of 4 - 8.0/ 8.0 Points Question 1 of 12 4.0/ 4.0 Points Which of the following would be considered a theory?  A.Hot air rises.  B.Gasoline has a very strong odor.  C.Glass is fragile.  D.Helium balloons float because helium is less dense than air. Answer Key: D Feedback: Good. A theory is a predictive model of nature, but it must be based on quantifiable measurements. It must involve objective measurements, not subjective evaluations like smell or personal opinions. Question 2 of 12 4.0/ 4.0 Points Who discovered the law of conservation of mass?  A.Nivaldo Tro  B.John Dalton and Antoine Lavoisier  C.Antoine Lavoisier  D.John Dalton  E.none of the above Answer Key: C Feedback: Good. It was Lavoisier.

Part 2 of 4 - 8.0/ 12.0 Points Question 3 of 12 4.0/ 4.0 Points How many significant digits should be reported in the answer to the following calculation? (4.3 - 3.7) × 12.3=  A.2  B.3  C.1  D.4  E.none of the above Answer Key: C Feedback: Good. This was covered in section 2.4 of the text. Question 4 of 12 4.0/ 4.0 Points How many liters are in 333 mL?  A.0.333  B.3.33  C.3.33 × 105  D.33.3  E.none of the above Answer Key: A Feedback: Good. This is a basic conversion problem. Question 5 of 12 0.0/ 4.0 Points The correct scientific notation for the number 0.00050210 is:  A.5.021 × 10-4  B.5.0210 × 10-4  C.5.0210 × 104  D.5.021 × 104  E.none of the above Answer Key: B Feedback: Scientific notation is discussed in section 2.2 of the text.

Part 3 of 4 - 20.0/ 20.0 Points Question 6 of 12 4.0/ 4.0 Points What is the value of 335 K on the Celsius temperature scale?  A.167  B.608  C.66.4  D.62  E.none of the above Answer Key: D Question 7 of 12 4.0/ 4.0 Points How would you classify salt water?  A.mixture-homogeneous  B.pure substance-compound  C.mixture-heterogeneous  D.pure substance-element  E.none of the above Answer Key: A Question 8 of 12 4.0/ 4.0 Points A solution is an example of a (an)  A.element.  B.heterogeneous mixture.  C.compound.  D.homogeneous mixture.  E.pure substance. Answer Key: D Question 9 of 12 4.0/ 4.0 Points When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 9 grams of water and 11 grams of carbon dioxide from 16 grams of oxygen, how many grams of methane were needed for the reaction?  A.40  B.4  C.31  D.20  E.none of the above Answer Key: B Question 10 of 12 4.0/ 4.0 Points If a solid piece of shiny sodium metal is exposed to chlorine gas, a large amount of heat is released and the white solid sodium chloride (table salt) forms. Based on this information, which of the following statements is TRUE?  A.Sodium chloride is an element.  B.This process was exothermic.  C.Mass is lost during this process.  D.This process represents a physical change.  E.none of the above Answer Key: B

Part 4 of 4 - 10.0/ 10.0 Points Question 11 of 12 5.0/ 5.0 Points A hybrid SUV consumes fuel at a rate of 12.8 km/L. how many miles can the car travel on 22.5 gallons of gasoline? Given rate of fuel consumption = 12.8 km/L 1 gallon = 3.785 litres 22.5 gallons = 22.5 * 3.785 = 85.1625 litres Number of kilometers travelled by SUV with Fcr 12.8 km/L = 1090.08 kms 1 km = 0.62137 miles 1090.08 kms = 1090.08 * 0.62137 = 677.34 miles Question 12 of 12 5.0/ 5.0 Points A 52.3 kg sample of ethanol is needed for a reaction. What volume in liters of ethanol should be used? The density of ethanol is 0.789 g/mL Density = Mass / Volume  Given density = 0.789 g/mL Volume = Mass / Density = 52300 / 0.789 = 66286 mL = 66.2 Liters

Part 1 of 4 - 8.0/ 8.0 Points Question 1 of 12 4.0/ 4.0 Points Which of the following would be considered a theory?  A.Hot air rises.  B.Gasoline has a very strong odor.  C.Glass is fragile.  D.Helium balloons float because helium is less dense than air. Answer Key: D Feedback: Good. A theory is a predictive model of nature, but it must be based on quantifiable measurements. It must involve objective measurements, not subjective evaluations like smell or personal opinions. Question 2 of 12 4.0/ 4.0 Points A sample of wood with a mass of 3.0 grams was burned in an open dish. The ashes weighed 1.2 grams. What happened to the rest of the wood?  A.Nothing, the burned wood simply has a mass of 1.2 grams.  B.The remaining mass was destroyed.  C.The remaining 1.8 grams was converted into heat.  D.The remaining 1.8 grams was converted into gaseous compounds.  E.none of the above Answer Key: D Feedback: Good! It's the law of conservation here. It had to go somewhere, so if it's not there, it must be in gaseous form.

Part 2 of 4 - 12.0/ 12.0 Points Question 3 of 12 4.0/ 4.0 Points The correct decimal representation of 1.201 × 10-7 is:  A.12010000  B.0.0000001201  C.1201.000  D.0.0001201  E.none of the above Answer Key: B Feedback: Good. Scientific notation is discussed in section 2.2 of the text. Question 4 of 12 4.0/ 4.0 Points The correct multiplier for the prefix pico is:  A.10-9  B.10-3  C.10-6  D.10-12  E.none of the above Answer Key: D Feedback: Good. Prefixes and their multipliers are discussed in section 2.5 of the text. Question 5 of 12 4.0/ 4.0 Points The correct multiplier for the prefix micro is:  A.10-6  B.106  C.10-9  D.103  E.none of the above Answer Key: A Feedback: Good. Prefixes and their multipliers are discussed in section 2.5 of the text.

Part 3 of 4 - 20.0/ 20.0 Points Question 6 of 12 4.0/ 4.0 Points . Which of the following items is a mixture?  A.helium  B.sugar  C.water  D.brass  E.none of the above Answer Key: D Question 7 of 12 4.0/ 4.0 Points Which of the following is a heterogenous mixture?  A.milk  B.sugar water  C.air  D.raisin bran  E.none of the above Answer Key: D Question 8 of 12 4.0/ 4.0 Points Which of the following items is a physical property?  A.the combustion of gasoline  B.the tarnishing of a copper statue  C.the odor of spearmint gum  D.the corrosive action of acid rain on granite  E.none of the above Answer Key: C Question 9 of 12 4.0/ 4.0 Points How many kilojoules are there in 95.0 Calories?  A.3.97 × 10-4  B.397  C.2.27 × 107  D.22.7  E.none of the above Answer Key: B Question 10 of 12 4.0/ 4.0 Points Which of the following statements is FALSE?  A.Mixtures may be composed of two or more elements, two or more compounds, or a combination of both.  B.A pure substance may either be an element or a compound.  C.A mixture may be either homogeneous or heterogeneous.  D.Matter may be a pure substance or it may be a mixture.  E.All of the above statements are true. Answer Key: E

Part 4 of 4 - 10.0/ 10.0 Points Question 11 of 12 5.0/ 5.0 Points A room contains 48 kg of air. How many KWh of energy are necessary to heat the air in the house from 7oC to 28oC? The heat capacity of air is 1.03 J/goC. Energy in joules = mass air x specific heat air x (Tfinal-Tinitial) = 48000*1.03*(28-7) = 1038240 J  1 J = 2.78*10-7 KWh.  Energy necessary = 1038240 * 2.78 * 10-7 = 0.2886 KWh. Question 12 of 12 5.0/ 5.0 Points State the steps in the Scientific Method. The scientific method to discover the answer to a scientific problem needs the following steps: Research Problem Hypothesis Project Experimentation Project Conclusion In simple words we can state something like below, Ask a Question Do Background Research Construct a Hypothesis Test Your Hypothesis by Doing an Experiment Analyze Your Data and Draw a Conclusion Communicate Your Results

Question 1 of 12 4.0/ 4.0 Points Which of the following is an example of a scientific law?  A.When a can of soda pop is opened, a fizzing sound is heard.  B.Flammable objects contain phlogiston.  C.In a chemical reaction, matter is neither created nor destroyed.  D.All matter is composed of small, indestructible particles called atoms.  E.none of the above Answer Key: C Feedback: Good. This is Lavoisier's Law of Conservation of Mass. Question 2 of 12 4.0/ 4.0 Points Which of the following would be considered a theory?  A.Hot air rises.  B.Gasoline has a very strong odor.  C.Glass is fragile.  D.Helium balloons float because helium is less dense than air. Answer Key: D Feedback: Good. A theory is a predictive model of nature, but it must be based on quantifiable measurements. It must involve objective measurements, not subjective evaluations like smell or personal opinions.

Part 2 of 4 - 12.0/ 12.0 Points Question 3 of 12 4.0/ 4.0 Points How many milliliters are in 17.5 L?  A.175  B.1.75 × 10^4  C.1.75 × 10^3  D.1.75 × 10^-2  E.none of the above Answer Key: B Question 4 of 12 4.0/ 4.0 Points Suppose a thermometer has marks at every one degree increment and the mercury level on the thermometer is exactly between the 25 and 26 degree Celsius marks. We should properly report the temperature measurement as  A.25.50°C  B.25.55°C  C.26°C  D.25.5°C  E.25°C Answer Key: D Feedback: Good. Always go one number past the most certain digit. This is covered in section 2.3 of the book. Question 5 of 12 4.0/ 4.0 Points The correct number of significant figures in the number 9.080 x 10-4 is  A.4  B.3  C.5  D.ambiguous  E.none of the above Answer Key: A Feedback: Good. This is discussed in section 2.3 of the text.

Part 3 of 4 - 20.0/ 20.0 Points Question 6 of 12 4.0/ 4.0 Points A 15.0 gram lead ball at 25.0°C was heated with 40.5 joules of heat. Given the specific heat of lead is 0.128 J/g∙°C, what is the final temperature of the lead?  A.46.1°C  B.77.8°C  C.0.844°C  D.21.1°C  E.none of the above Answer Key: A Question 7 of 12 4.0/ 4.0 Points Which of the following is a heterogenous mixture?  A.milk  B.sugar water  C.air  D.raisin bran  E.none of the above Answer Key: D Question 8 of 12 4.0/ 4.0 Points How would you classify salt water?  A.mixture-homogeneous  B.pure substance-compound  C.mixture-heterogeneous  D.pure substance-element  E.none of the above Answer Key: A Question 9 of 12 4.0/ 4.0 Points Which of the following is a homogeneous mixture?  A.trail mix  B.water  C.stainless steel  D.molten iron  E.none of the above Answer Key: C Question 10 of 12 4.0/ 4.0 Points What is the value of 27°C on the Kelvin temperature scale?  A.246  B.273  C.300  D.81  E.none of the above Answer Key: C

Part 4 of 4 - 10.0/ 10.0 Points Question 11 of 12 5.0/ 5.0 Points A log is either oak or pine. It displaces 2.7 gal of water and weighs 19.8 lb. Is the log oak or pine? (Density of oak = 0.9 g/cm3; Density of pine = 0.4 g/cm3) First converting our densities to g/cm^3  1 gal=.3785 cm^3  1lb=453.59grams  So:  19.8 lbs x 453.59 g/1lb = 8980g  2.7 gal x .3785 cm^3/1gal= 1.022 cm^3  This means that the density of the  wood is  8980g/1.022cm^3 = 8787  g/cm^3  So the wood is oak. Question 12 of 12 5.0/ 5.0 Points A room contains 48 kg of air. How many KWh of energy are necessary to heat the air in the house from 7oC to 28oC? The heat capacity of air is 1.03 J/goC. We need 1.03 kJ for 1 kg air and a temperature rise by 1°. The heat energy needed for 48 kg air and a temp. rise by 21° (28-7 = 21) is then  E = 1.03*48*21 kJ = 1038.24 kJ = 1038.240 kW*s (kWs). with 1 J = 1 Ws  To find this amount of energy expressed in kWh, we have to divide by the number of seconds in an hour, which is 60^2 = 3600:  1038.24 kWs = 1038.24/3600 kWh = 0.2884 kWh

Part 1 of 4 - 8.0/ 8.0 Points Question 1 of 12 4.0/ 4.0 Points According to the scientific method, what frequently leads to the development of a hypothesis?  A.reason  B.observation  C.experiments  D.none of the above  E.scientific law Answer Key: B Feedback: Good. This is the scientific method. Question 2 of 12 4.0/ 4.0 Points ca as saying "The most important idea in all of human knowledge is that all things are made of atoms"?  A.Antoine Lavoisier  B.Michael Faraday  C.Richard Feynman  D.John Dalton Answer Key: C

Part 2 of 4 - 4.0/ 12.0 Points Question 3 of 12 0.0/ 4.0 Points For the number 10405.630, which of the zeroes are considered significant?  A.Only the zero after the 1  B.Only the zero after the 4  C.Only the zero after the 3  D.Only the zeros after the 1 and 4.  E.All of the zeros are significant Answer Key: E Question 4 of 12 4.0/ 4.0 Points How many significant figures will be in the final answer of this calculation? 2.15 × 11.2 ÷ 0.8765 = ________  A.3  B.4  C.6  D.11  E.none of the above Answer Key: A Feedback: Good! Be sure to get these sig figs down at the beginning. Doing so will make it much easier for you later in the course. Question 5 of 12 0.0/ 4.0 Points My daughter loves yogurt covered raisins.  If I can buy a pound of yogurt covered raisins for $4.99, how much would it cost for me to purchase 1.25 kg of yogurt covered raisins?    A.$10.98  B.$6.24  C.$13.72  D.$2.84  E. $9.98 Answer Key: A Feedback: See section 2.6 in the text. This is a basic conversion problem.

Part 3 of 4 - 16.0/ 20.0 Points Question 6 of 12 0.0/ 4.0 Points How many calories are in 32 Calories?  A.3200  B.32  C.32000  D.320 Answer Key: C Question 7 of 12 4.0/ 4.0 Points `Which of the following is a homogeneous mixture?  A.brass  B.chicken noodle soup  C.liquid iron  D.trail mix  E.water Answer Key: A Question 8 of 12 4.0/ 4.0 Points `If I apply 0.108 kJ of energy in order to increase the temperature of a bar of gold from 30.0°C to 34.7°C, and the specific heat capacity of gold is 0.128 J/gC, what is the mass the bar of gold in grams?  A.1.28 × 10^2 g  B.1.08 × 10^2 g  C.1.8 × 10^2 g  D.6.5 × 10^1 g  E.none of the above Answer Key: C Question 9 of 12 4.0/ 4.0 Points `How should someone classify macaroni and cheese?  A.mixture-homogeneous  B.pure substance-element  C.mixture-heterogeneous  D.pure substance-compound  E.none of the above Answer Key: C Question 10 of 12 4.0/ 4.0 Points `How should someone classify grape juice?  A.mixture-homogeneous  B.pure substance-compound  C.mixture-heterogeneous  D.pure substance-element  E.none of the above Answer Key: A

Part 4 of 4 - 0.0/ 10.0 Points Question 11 of 12 0.0/ 5.0 Points `The density of my own home brew beer is around 1.050 grams per cubic centimeter. If I poured myself 3 ice cold foamy glasses that had a total mass of 1.220 kg, what is the volume of beer I would be consuming (in liters)? All work must be shown, labeled, and explained in detail to receive credit. Note that where applicable, superscripts (X2) can be written as X^2 and subscripts (X2) can be written as X_2 if it saves you time. Its given that, Density of home brew beer is 1.050 g/cm^3 Mass of the beer poured into glasses is 1.220 kg Volume of beer in Liters = ___ ? As we have the relation between mass, density and volume as  Density  = Mass / Volume 1.050 (g/cm^3) = 1.220 * 1000 g/Volume (Converted kg to g) So Volume  = (1220/1.050) cm^3  (g gets cancelled out) Volume = (1220/1.050)*0.001 L = 1.1619 L Feedback: See section 2.9 Question 12 of 12 0.0/ 5.0 Points It has been stated that numbers are "meaningless" without an associated unit. Do you agree or disagree with this statement? Provide at least 2 reasons why you agree or disagree. We need language as a means of communication to lead a stress less life in present day society. Language is the only means through which we can let others know what we feel and also we can get to know how he/she feels about the same incident. In the same way in scientific world, we need some means to communicate. Lets say there is a scientist in Japan who is working on my area of interest and I wanted to get some information from him, here to communicate properly (scientifically) we need to refer to same set of units so that we can correlate our findings and observations. Also lets say, if a stranger asks me how far certain place is and if I simply say 10 that doesnt make any sense to him/her, we should be mentioning units. Also we cannot say it as 10 L too, because L is used as a unit for expressing volume of a liquid, and here as he asked for distance, I should be telling him in meters or kilometers or miles like say 10 miles, so that it would make sense to him. I can only think of this example when I think about any other example. This happened few months back when I had been to a local departmental stores. There was a guy who was requesting the eggs in pounds rather than dozens or units. That was really hilarious but to my surprise only after few minutes we all got to know that he was filming a prank video. If we use inappropriate units for the numbers we can expect the same! Model Short Answer: Numbers need to have its associated unit to have significance. You also can't set up a solution map to convert the number from one unit to another unless you already know what the original unit is. For example, the number 52 doesn't necessarily mean anything unless you know if it is a temperature or a length or a mass.

Part 1 of 4 - 8.0/ 8.0 Points Question 1 of 12 4.0/ 4.0 Points The key to success in chemistry is:  A.commitment.  B.curiosity.  C.mathematical skills.  D.practice.  E.all of the above Answer Key: E Feedback: Good! All of these are needed to succeed. Question 2 of 12 4.0/ 4.0 Points Which of the following is an example of a scientific law?  A.When a can of soda pop is opened, a fizzing sound is heard.  B.Flammable objects contain phlogiston.  C.In a chemical reaction, matter is neither created nor destroyed.  D.All matter is composed of small, indestructible particles called atoms.  E.none of the above Answer Key: C Feedback: Good. This is Lavoisier's Law of Conservation of Mass.

Part 2 of 4 - 12.0/ 12.0 Points Question 3 of 12 4.0/ 4.0 Points There are exactly 2.54 centimeters in 1 inch. When using this conversion factor, how many significant figures are you limited to?  A.1  B.3  C.ambiguous  D.depends on if you are using it in multiplication/division or addition/subtraction  E.infinite number of significant figures Answer Key: E Feedback: Good. This is covered in section 2.3 in the text. Question 4 of 12 4.0/ 4.0 Points How many liters are in 333 mL?  A.0.333  B.3.33  C.3.33 × 105  D.33.3  E.none of the above Answer Key: A Feedback: Good. This is a basic conversion problem. Question 5 of 12 4.0/ 4.0 Points Given the density of Au is 19.3 g/cm3, determine the mass of gold in an ingot with the dimensions of 10.0 in × 4.00 in × 3.00 in.  A.3.80 × 104  B.2.32 × 103  C.0.161  D.102  E.none of the above Answer Key: A Feedback: Good. This is both a density and a conversion problem. You have to get your units the same.

Part 3 of 4 - 20.0/ 20.0 Points Question 6 of 12 4.0/ 4.0 Points Which of the following is a homogeneous mixture?  A.trail mix  B.water  C.stainless steel  D.molten iron  E.none of the above Answer Key: C Question 7 of 12 4.0/ 4.0 Points How would you classify raisin bran?  A.mixture-homogeneous  B.pure substance-element  C.mixture-heterogeneous  D.pure substance-compound  E.none of the above Answer Key: C Question 8 of 12 4.0/ 4.0 Points A 15.0 gram lead ball at 25.0°C was heated with 40.5 joules of heat. Given the specific heat of lead is 0.128 J/g∙°C, what is the final temperature of the lead?  A.46.1°C  B.77.8°C  C.0.844°C  D.21.1°C  E.none of the above Answer Key: A Question 9 of 12 4.0/ 4.0 Points When methane is burned with oxygen the products are carbon dioxide and water. If you produce 36 grams of water and 44 grams of carbon dioxide from 16 grams of methane, how many grams of oxygen were needed for the reaction?  A.32  B.96  C.80  D.64  E.none of the above Answer Key: D Question 10 of 12 4.0/ 4.0 Points How many kilojoules are there in 95.0 Calories?  A.3.97 × 10-4  B.397  C.2.27 × 107  D.22.7  E.none of the above Answer Key: B

Part 4 of 4 - 0.0/ 10.0 Points Question 11 of 12 0.0/ 5.0 Points A room contains 48 kg of air. How many KWh of energy are necessary to heat the air in the house from 7oC to 28oC? The heat capacity of air is 1.03 J/goC. As we need the temperature in C and the mass in grams, 48kg = 48000 g q=mc(dt),  q= amount of heat energy gained or lost by the substance m= mass of sample c= heat capacity dt = difference in temperatures  so by plugging the given values, we get, q = 48000(1.03)*(28-7) q = 1334880 J = 0.3708 kWh. Question 12 of 12 0.0/ 5.0 Points Give 2 examples of a Physical Property. Give 2 examples of a Chemical Property. Examples of Physical Properties A physical property is any property of matter or energy that can be measured. It is an attribute of matter that can be observed or perceived. Common Physical Properties  Absorption of electromagnetic - The way a photon’s energy is taken up by matter  Absorption (physical) - Absorption between two forms of matter Color - Hue of an object as perceived by humans Concentration - Amount of one substance in a mixture Chemical properties can only be established by changing a substance’s chemical identity, and are different from physical properties, which can be observed by viewing or touching a sample. The internal qualities of a substance must be altered to determine its chemical properties. For example: Flammability - How easily something will burn or ignite, is a chemical property because you can’t tell just by looking at something how easily it will burn. Fire testing is done to determine how difficult or easy it will be to get a certain material to burn. Information about flammability is used in building codes, fire codes, insurance requirements, and storing, handling, and transporting highly flammable materials.  Heat of Combustion - This chemical property is the amount of energy that is released as heat when a substance is burned with oxygen.

Question 1 of 12 0.0/ 4.0 Points What are chemists most interested in?  A.connections between properties and structures of substances  B.the study of life  C.the study of the human body and how it is affected  D.the science of matter and how it responds to the environment  E.all of the above are things that chemists are interested in Answer Key: A Feedback: See section 1.1 in the text. This is a basic inference based on the information given. Question 2 of 12 4.0/ 4.0 Points Who discovered the law of conservation of mass?  A.John Dalton  B.Antoine Lavoisier  C.John Dalton and Antoine Lavoisier  D.Albert Einstein  E.none of the above Answer Key: B Feedback: Good. It was Antoine Lavoisier.

Part 2 of 4 - 8.0/ 12.0 Points Question 3 of 12 4.0/ 4.0 Points 2.64 × 10-3 written as a decimal is:  A.0.00264  B.none of the above  C. 2.64  D.0.000264  E.0.264 Answer Key: A Feedback: Good. Scientific notation is discussed in section 2.2 of the text. Question 4 of 12 0.0/ 4.0 Points A room has dimensions of 10.0 ft × 12.0 ft × 14.0 ft. Given that there are three feet in a yard, what is the volume of the room in yd3?  A.1,680  B.62.3  C.5,040  D.560  E.none of the above Answer Key: B Feedback: See section 2.8 in the text. This is a basic conversion problem, but with using exponents. Question 5 of 12 4.0/ 4.0 Points In the number 35000.123, which of the zeroes are considered significant?  A.All the zeroes are significant.  B.The third zero after the 35  C.The second zero after the 35  D.The first zero after the 35 Answer Key: A

Part 3 of 4 - 20.0/ 20.0 Points Question 6 of 12 4.0/ 4.0 Points Which of these would be a chemical property?  A.the boiling point of water  B.oxidation of copper  C.the smell of apples  D.boiling point of acetone  E.none of the above Answer Key: B Question 7 of 12 4.0/ 4.0 Points `What is the value of 9.0°C on the Kelvin temperature scale?  A.282.15  B.48.2  C.-12.78  D.260.37  E.none of the above Answer Key: A Question 8 of 12 4.0/ 4.0 Points ____ energy is the energy of position.  A.electrical  B.kinetic  C.potential  D.chemical  E.mechanical Answer Key: C Question 9 of 12 4.0/ 4.0 Points `What symbol below is used to represent change in temperature?  A.ΔT  B.m  C.q  D.C  E.none of the above Answer Key: A Question 10 of 12 4.0/ 4.0 Points You are eating a bag of M&M's. Some of the M&M's start to melt in your hand. This represents a _______.  A.chemical change  B.physical property.  C.distillation  D.chemical property  E.physical change Answer Key: E

Part 4 of 4 - 10.0/ 10.0 Points Question 11 of 12 5.0/ 5.0 Points The scientific method provides a guideline for scientists to solve problems and answer questions. You may not be a scientist, but you certainly use the scientific method as part of your daily life. Summarize the scientific method IN YOUR OWN WORDS. Then, describe an example from your own life where you used each of the steps to solve a problem, even if wasn't in an official "scientific" capacity.  I feel like we always follow the scientific method to get to our solutions. I would like to discuss some science project which has been done by me as a kid. I just related that experiment to scientific method and observed that we actually followed it!! We were asked to study the importance of sunlight on the growth of the plant. Here, Question would be is the sun light important or not for the growth of the plant. Background Research says, yeah that is important for photosynthesis through which plant will make its own food called Starch. Hypothesis: Yeah it might be needed so lets check what it does if we keep it isolated with but exposed to sun light in one corner where it is placed. Experiment: Prepared a box in which plant is kept with a small opening in one cornet allowing sun light to pass through it.  Conclusion: Plant is growing towards that opening !!! and thus we can conclude that sunlight is needed.  As per the text book, the scientific method to discover the answer to a scientific problem needs the following steps: Research Problem Hypothesis Project Experimentation Project Conclusion In simple words we can state something like below, Ask a Question Do Background Research Construct a Hypothesis Test Your Hypothesis by Doing an Experiment Analyze Your Data and Draw a Conclusion Feedback: See section 1.4 Comment: good job! Question 12 of 12 5.0/ 5.0 Points I recently went to a museum and was able to measure a bar of solid gold.  The bar measured 7in x 3.625 in x 1.75 in.   a)  What is the mass, in grams, of the gold bar?  Density of gold = 19.6 g/cm3.   b)  If gold is currently selling for $36.74 per gram, how much is the gold bar I saw at the museum worth?   All work must be shown, labeled, and explained in detail to receive credit. Note that where applicable, superscripts (X2) can be written as X^2 and subscripts (X2) can be written as X_2 if it saves you time. Its given that, Density of gold is 19.6  g/cm^3 Dimensions of the gold bar are 7in x 3.625 in x 1.75 in a) Volume of bar is given by = 7x3.625x1.75 = 44.40625 in3 As we have the relation between mass, density and volume as  Density  = Mass / Volume 19.6 (g/cm^3) = Mass of gold bar in g/ 44.40625 in3 So Mass of gold bar  = 19.6 x 727.68806075 (Converted cubic inches to cubic cm) Mass of gold bar  =  14262.6859907 grams   b) Cost of 1 gram of gold  = $ 36.74 Cost of 14262.6859907 grams of gold  = 36.74*14262.6859907 =  $ 524,011.08 rounded to nearest cent.            Feedback: See section 2.9 Comment: good job