Scenario 1A chef is trying to figure out if adding salt to the top of their lasagna will change how fast cheese melts.They put four lasagnas, with different amounts of salt, into the oven at 180ºC. They then timed how long the cheese took to melt on each lasagna.Question 8SavedIdentify the independent variable.Amount of saltOven temperatureTime to melt the cheeseType of cheeseI'm not sureQuestion 9SavedIdentify the dependent variable.Amount of saltOven temperatureTime to melt the cheeseType of cheeseI'm not sureQuestion 10SavedDetermine a testable hypothesis for this investigation.Scenario 2You are setting up an investigation to answer the following testable question:Does the water temperature affect the time it takes to boil an egg?Question 11Identify the independent and dependent variables. Independent variableDependent variableQuestion 12SavedDetermine a testable hypothesis for this investigation.Question 13Identify two controlled variables and explain why they need to remain the same.Controlled variableReason for control

The higher the temperature of the oven, the faster the food will cook.Identify the:Independent variable: Blank 1 Question 9Dependent variable: Blank 2 Question 9Controlled variable: Blank 3 Question 9Question 10Not yet answeredMarked out of 3.00Flag questionQuestion textAn investigation found that more potatoes were produced when more nitrogen was present in the fertilizer used.Identify the:Independent variable: Blank 1 Question 10Dependent variable: Blank 2 Question 10Controlled variable: Blank 3 Question 10Question 11Not yet answeredMarked out of 3.00Flag questionQuestion textThe amount of pollution produced by cars was measured based on the type of fuel it used.Identify the:Independent variable: Blank 1 Question 11Dependent variable: Blank 2 Question 11Controlled variable: Blank 3 Question 11Question 12Not yet answeredMarked out of 3.00Flag questionQuestion textA student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight.Identify the:Independent variable: Blank 1 Question 12Dependent variable: Blank 2 Question 12Controlled variable: Blank 3 Question 12Question 13Not yet answeredMarked out of 3.00Flag questionQuestion textStudents of different ages were given the same puzzle to assemble. The puzzle assembly time was measured.Identify the:Independent variable: Blank 1 Question 13Dependent variable: Blank 2 Question 13Controlled variable: Blank 3 Question 13

. A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make coats. (a) A scientist tested ‘Wellwarm’ to see how well it insulated a beaker of hot water. She tested ‘Wellwarm’ and three other materials as shown below. She wrapped each beaker in a different material. She recorded the temperature at the start and 20 minutes later. (i) What was the independent variable that the scientist changed? (ii) What was the dependent variable that the scientist measured during the investigation? (b) The results of the investigation are shown below. time (minutes) temperature of water (°C) wrapped in material A material B material C material D 0 60 60 60 60 20 34 40 38 36 material A material B material C material D thermometerlidPrimaryTools.co.ukPrimaryTools.co.uk KS3/09/Sc/Tier 3–6/P1 19 Total 8 9c 1 mark 9bii 1 mark 9c 1 mark 9d 1 mark 9e 1 mark (i) The scientist said that the ‘Wellwarm’ material is the best insulator. Which material was ‘Wellwarm’? Use the results to help you. Tick the correct box. (ii) Use the evidence in the results table to explain your choice. (c) The company made a coat from each of the four materials they tested. A person tested the different coats by wearing each one in a cold room. He measured the temperature inside each coat for 30 minutes. Write down two other variables that should be controlled to make this a fair test. 1. 2. (d) Write down one thing the scientists should do to make sure the person testing the coats is safe. (e) Suggest one advantage of using a temperature sensor and data logger instead of a thermometer in this experiment. maximum 8 marks 9bi 1 mark

Alysha wants to test the effect of different materials on the melting rate of ice. She finds the initial mass of four pieces of ice. She then covers three pieces with either tinfoil, plastic wrap, or paper. The fourth piece is left uncovered.After 30 minutes, Alysha calculates the final mass of each piece of ice to determine which melted the fastest.What are the independent and dependent variables in Alysha's experiment?

A student carries out an experiment to determine the volume of 2 M sodium hydroxide needed to neutralise a known volume of 2 M hydrochloric acid.As different volumes of sodium hydroxide are added, the student uses a thermometer to measure the initial and final temperature. The change in temperature is then calculated.Which of the following options correctly identifies the variables in this investigation?I DON'T KNOWSUBMIT ANSWER

Time Remaining: 18 minsYour time is halfway up.Next QuestionTamika is preheating her oven before using it to bake. Tamika wants to predict the final temperature after xx minutes. She wrote the equation y, equals, 45, x, plus, 67y=45x+67, where yy represents the final temperature in degrees Fahrenheit. What could the number 67 in Tamika's equation represent?AnswerMultiple Choice AnswersThe change in minutes for every change of one degree Fahrenheit.The temperature the oven starts at.The change in degrees Fahrenheit for every change of one minute.The time when the oven's temperature is 0, degrees0 ∘ .