1 Practical skills in Chemistry

Question 1

What are the 2 types of research

Answer 1

The 2 types of research are primary research and secondary research

Question 2

Define primary research

Answer 2

Primary research is new data that is collected and conclusions are drawn from it

Question 3

Define secondary research

Answer 3

Secondary research is when data from other studies are used in different ways to draw conclusion

Question 4

What is an aim?

Answer 4

An aim is either a question that needs answering or a hypothesis that must be tested

Question 5

What is a hypothesis?

Answer 5

A hypothesis is a prediction using trusted info and their own scientific knowledge

Question 6

What is a valid experiment?

Answer 6

A valid experiment gives info to test the aim of the experiment.

Question 7

What are 2 types of primary research?

Answer 7

The 2 types of primary research are surveys and experiments

Question 8

What is a type of secondary research?

Answer 8

Meta study (which uses raw data from other studies to try answer a new aim) is a type of secondary research.

Question 9

What is quantitative data?

Answer 9

Quantitative data has a numerical value and must require a measuring instrument to be observed

Question 10

What is qualitative data?

Answer 10

Qualitative data is descriptions of what is being observed

Question 11

What is resolution?

Answer 11

Resolution is the smallest change in the quantity measured.

Question 12

What is accuracy?

Answer 12

Accuracy is how close a measurement is to the true value

Question 13

What is an experiment?

Answer 13

An experiment is ordered practical steps to test a hypothesis.

Question 14

Define variable

Answer 14

Variables are factors that affect the outcome of an experiment

Question 15

Define independent variable

Answer 15

An independent variable is the factor that you want to change to see the effect it has on another factor.

Question 16

Define dependent variable

Answer 16

A dependent variable is the factor you are measuring in an experiment

Question 17

Define control variable

Answer 17

A control variable is the factor you are keeping constant so results can be compared.

Question 18

Define extraneous variable

Answer 18

An extraneous variable is a factor that is not controlled or measured however it may produce error in the results.

Question 19

What is a plan?

Answer 19

A plan is a summary of the experiment

Question 20

What is a method?

Answer 20

A method is a detailed step-by-step explanation on how to do the experiment

Question 21

What does continuous variable mean?

Answer 21

Continuous variables are a measured value that could be any number (e.g. temperature)

Question 22

What does discrete variable mean?

Answer 22

Discrete variable are values that can only be a specific number (e.g. atomic number)

Question 23

What are categoric variables?

Answer 23

Categoric variables are a qualitative description (e.g. colour of a precipitate)

Question 24

Define concordant results

Answer 24

Concordant results are values that are close to each other so they show reliabe quantitative data.

Question 25

Define anomalous results

Answer 25

Anomalous results do not follow the general trend of the data

Question 26

Define repeatable results

Answer 26

Repeatable results are values that give similar or concordant results when repeating the experiment.

Question 27

Define reproducible results

Answer 27

Reproducible results are results that give similar values when other people do the same experiment

Question 28

Define reliable results

Answer 28

Reliable results are similar when repeated

Question 29

Define accurate results

Answer 29

Accurate results are close to the true value

Question 30

Define false positive

Answer 30

A false positive is when a positive result is produced but not due to the desired product being made.

Question 31

Define margin of error

Answer 31

Margin of error shows the range that a value lies within

Question 32

Define precision

Answer 32

Precision is the degree to which repeated values in an experiment, collected in the same conditions, show the same result

Question 33

Define weighing by difference

Answer 33

Weighing by difference is a method that is used to accurately weigh the amount of material transferred

Question 34

Define percentage error

Answer 34

Percentage error is a way of comparing the experimental value with the actual value

Question 35

Define parallax error

Answer 35

Parallax error is caused when the scale is read from a different angle, showing a different result than the accurate value

Question 36

What are the 2 factors that cause uncertainty?

Answer 36

Systematic error and random errors causes uncertainty in data