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Ihave my work put down already! but my teacher have said that number 2 and 3 are messed ! ill give the highest amount of points for she said "great start on this activity! for full credit, resubmit and try again on whether mass is conserved for reactions #2 and #3, i know you got this! " conservation of mass activity worksheet instructions: observe and analyze the interactions between the substances pictured in the slide show. compare the properties of substances before and after each interaction. you will submit your completed worksheet for grading. data table on the table below, record your observations before and after the interactions and explain how mass was conserved. describe the changes in properties that prove a chemical reaction occurred. the first row is an example. 3 observations before interaction observations after interaction how was mass conserved? proof of a chemical reaction example: sugar + heat the sugar is in tiny white particles in a pile. heat is not seen but is implied by the heat source. the pile of sugar in the pot has a mass of 100 grams. there is a solid, light brown mass at the bottom of the pot. it has a mass of 100 grams. the mass of the sugar is the same in melted form as it is in solid crystal form. there was not a chemical reaction. sugar did not change composition. it only melted. melting point is a physical property, and this is a physical change. steel wool + oxygen (fire) steel wool is like a cloth but is electrical and has a mass of 6 grams, until heat is touched. when heat is applied to steel wool, heat such as batteries attract to steel wool, it starts to heat up until it is hot enough to make fire. well mass cannot be created or destroyed, it depends on the mass of a substance, i’m going to say that there is a chemical reaction because of how fire burns and reacts, if it was a stove of sugar like the example said, it only melted so its only physical change, so i consider steel wood and fire basically a chemical reaction and a change. egg + heat eggs are simple and are from chickens, some eggs can be white or brown but there is no difference, one egg is about 40 grams or more. one egg carries a substance that overweighs the egg. when the egg is cracked, the egg is weighed less than before it is weighing at at least 5 or 6. the mass of it is changed because it was originally from an egg shell that carried it, with that, the shell weighs less, and the egg is now being cooked and heated which should make the weight in general of the egg about 8 grams or 10. this would be called physical change and it would not be called a chemical change at all. water + heat water is a normal substance which can be drinkin’ or could be boiled and for all kinds of things, but lets say we have a cup of water, which is about 60 grams. if we take the water, and put it in the pot, it would still be the same amount grams because we only poured it out a cup that almost weighs the same as a pot. now lets say if we boil the water, when we boil water for too long it starts to heat up and soon evaporates into steam or smoke, so it has boiled down to about 20 – 30 grams. the water is now being heated so that means that it will boil and lessen the weight which is now 20 – 30. this would be called thermal change and it would be called a physical change because of the water evaporating. zinc is like a rock that weighs at ab out 10 grams. hydrogen chloride weighs at least 6 grams. hydrogen gets bubbly after interaction with zinc which should now weigh it at about 4 or 3 grams. they equal the same amount of mass, they are both mass products. it’s a chemical because for example, think of paint and vinegar, we all know it bubbles up and its like a volcano, so this would be called a chemical change. sodium hydroxide + copper sulfate sodium hydroxide is clear and copper sulfate is blue, they both have different weighs. blue is 57 grams and the clear one is 0 grams. the only thing that changes is that it is a different color. besides so, the sodium sulfate weighs now at 47 grams and the copper sits at 20, now that they have interacted. they equal the same after being together. i will say this is chemical change as well as chemical reactant.

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

1. spending nights at a 3 star hotel in paris, france or spending nights at a 5 star hotel in new york city. 2. cell phone plans, comparing monthly fee and price per text message. you must use basic phones for the purpose of this project. vacation situation: you have graduated from high school and you are planning to go on a vacation by yourself. you have always wanted to travel to paris, france, but you need to consider the price of the ticket as well as the cost of hotel per night. as an alternative, you want to look into spending the same number of nights in new york city at a luxurious 5 star hotel. now you need to determine whether you should go to paris which will cost you for flight and hotel or stay in nyc that will cost you only for the hotel. note: you are spending the same number of nights at each destination. assignment: gather information from travel agencies, such as american airline, orbitz, expedia, or kayak, through their website for cost of flight and cost of hotel. then write a system of linear equations for the two plans and create a graph. use the methods we have been studying to determine which plan is better based on the number of nights you decide to stay if you had $1500 to spend for this vacation. cell phone plans situation: you have graduated from high school and moved away to college. your parents have decided that it’s time for you to pay for your own cell phone. you have to stick to a strict budget. now you need to determine whether you should go with a plan that costs more per month but charges less per text message or a cheaper plan that charges more per message. assignment: you are to choose from a cellphone company that offers two talk and text plans. the company charges a monthly service fee of $20 for either plan the customer chooses: talk and text plan a charges five cents a minutes and twenty dollars for 250 texts. talk and text plan b charges ten cents a minute (first 100 minutes free) and fifteen dollars for 200 texts. note: assume you are purchasing a basic phone, which is $0 with 2-year contract. you cannot purchase unlimited text messaging for this exercise. use the methods we have been studying to determine which plan is better based on the number of text messages you send per month if you only have $75 to spend each month. project details you will decide which project you want to do. after you decide on a project, you will need to: 1) collect the data if necessary. 2) write the system of linear equations and a word problem once the data has been collected. 3) use the methods we have been studying (graphing and solving algebraically) to find the solution to the written system. 4) design the final display of the project on a poster board. be creative! project rubric 2 points = data for the scenarios. (only applicable to vacation plans) 1 points = data 1 points = sources documented 8 points = word problem and the system of equations 2 points = all variables are defined 6 points = both equations are accurate 8 points = graphic solution 4 points = each line is correctly graphed 2 points = labels and titles 2 points = point of intersection 8 points = algebraic solution and explanation 4 points = correct solving 2 points = explain your work and how you came up with the parameters 2 points = check 14 points = final project 4 points = creativity 4 points = contains the analysis of your equations 6 points = final product is organized and clear final project checklist – refer to the rubric above make sure you have the following items on your final project… • collected data (if necessary) • system of linear equations with variables defined • graphs of both equations (this can be done on desmos and printed or drawn by hand) • algebraic solution with work and units • analysis: o if you chose vacation plan: for how many nights are the prices going to be same? if you had $1500 to spend for your vacation, which plan would you choose and why? o if you chose talk and text plan: for how many minutes will both plans hare the same cost? if you had $75 to spend each month, which plan should you choose and why? vacation – data organizer 1) define the variables 2) complete the following chart to you come up with a systems of linear equations destination paris, france new york city hotel rating   name of hotel price of hotel (per night) compare same nights price of flight linear equation 3) write an equation for staying in paris, france. 4) write an equation for staying in new york, ny. talk and text plans – data organizer 1) define the variables. 2) express plan a as an equation. 3) express plan b as an equation. *make sure you take into consideration that first 100 minutes of talking on the phone is free!