Btec Applied Science Unit 3 Exam Questions with Verified Answers

Btec Applied Science Unit 3 Exam Questions with Verified Answers What is a hypothesis? - AnswersAn Idea that you can test using practical experiments What are the Key features of a good hypothesis? - AnswersA good Hypothesis must: Be able to be tested scientifically Relate one dependent variable to on independent variable What is a Null Hypothesis? - AnswersStates that there is no relationship or causality, for example, no relation between the temperature and the rate of reaction. What does qualitative data refer to? - AnswersIt refers to the appearance or value of something, such as the colour observed or whether the bubbles are produced. What does Quantitative data refer to? - AnswersIt refers to numerical measurements made, such as the volumes and times measured. What is SOP? - AnswersThe Standard Operating Procedure. This is an established procedure or method used to carry out a routine activity. It ensures consistent results every time. What are some examples of SOPs? - AnswersTitration, Handling of chemicals, disposal of waste, qualitative analytical tests, preparing solutions What are risk assessments? - AnswersIt identifies hazards, evaluates the risks associated with those hazards and it determines ways to eliminate or control those risks. What is a Hazard? - AnswersWhen the equipment or substance can cause harm, for example a hot plate or hydrochloric acid What is a risk? - AnswersThe harm that the hazard could cause and the chances of it happening, for example the risk of using a hot plate is getting burnt. What is the independent variable? - AnswersThe variables you change during an investigation. What is the Dependent variable? - AnswersThe variables you are investigating and measure during an investigation. What is the control variable? - AnswersThe variables you keep constant during an investigation. What should a method be? - AnswersA step-by-step set of instructions, Be logically ordered, allows you to take sensible measurements, and allows you to test your hypothesis. When planning your method what do you need to make sure? - AnswersThat it will procedure a range of results, reliable results, precise results, and accurate results. What are some types of data? - AnswersThe data can be continuous such as the age of plant ir number of plants. Some data can be a mixture of numbers and names such as the number of different types of plants found in a garden. What data is normally displayed on a bar chart? - AnswersContinuous data. You need to make sure its a smooth curve of best fit, and that the curve goes through or near most of the points. What are bar charts used for? - AnswersThey are used for discrete data but can be used to compare different sets of data. What is the Pattern on the graph? - AnswersThe shape of the graph. It is the line that goes up as time goes by but eventually levels off What is the trend on a graph? - AnswersThe relationship between factors on the graph or in the table. The full trend is that the volume increases as the time increases but then levels off after a certain amount of time. What is the sample size? - AnswersThe number of people sampled in the investigation. To be confident in your conclusions you need a large sample size to give strong evidence. What is Primary data? - AnswersThis is the data that you have gathered for yourself through the experiments or investigations . What is secondary data? - AnswersThe data that you get in books, scientific papers or the internet. You should compare your primary and secondary data to draw a conclusion How do you know if the data is anomalous? - AnswersIt doesn't fit into the pattern of the other results. It does not lie close to the line of best fit. What can cause the anomalous data? - AnswersNot following the method correctly. inaccurate measuring/recording and impurities. What is systemic error? - AnswersThe error that is built into the method or equipment which you are using. This can be corrected by calibrating the balance. These errors are quantitative. What is the random error? - AnswersThese are due to not following the method correctly and can be minimized by repeating results and taking averages. What can misreading the observations cause - AnswersThey can cause qualitative errors.