Experiments

Question 1

Reliable results come from…

Answer 1

experiments that give the same results

Question 2

Valid results are…

Answer 2

reliable and from a fair test

Question 3

What improves validity?

Answer 3

controlling variables

Question 4

What is a variable?

Answer 4

something that can be changed

Question 5

How can you make an experiment safer?

Answer 5

heat proof mat, tie hair up, gloves, goggles, sensible shoes, lab coat

Question 6

What are potential hazards?

Answer 6

microorganisms, chemicals, fire, electricity

Question 7

for accurate results…

Answer 7

measure the right thing, don’t miss anything, don’t include anything not needed

Question 8

what are precise results

Answer 8

all close to the mean or your repeated results

Question 9

how do you plan an experiment

Answer 9

1. say what youre measuring
2. say what youre changing and how
3. describe the method and apparatus
4. describe variables youre keeping constant and how
5. say repeat x10 for reliable results
6. say if youre using a control or not

Question 10

what is a hypotheses

Answer 10

a possible explanation for something observed

Question 11

what are some ethical issues

Answer 11

are organisms being treated safely
are animals being treated humanely
are they being returned to their natural habitat

Question 12

what is positive correlation

Answer 12

when one variable increases the other increases too

Question 13

what is negative correlation

Answer 13

when one variable increases the other decreases

Question 14

how to write a conclusion?

Answer 14

make sure it matches the data
use results to justify
refer back to hypotheses

Question 15

what is an evaluation?

Answer 15

analysis of investigation. describe how it can be improved

Question 16

what should you evaluate

Answer 16

what the method valid
did you control other variables to make it a fair test
was there enough evidence to reach a conclusion
any anomalous results? if so, why
any variables that could affect results?
what would you change to improve results

Question 17

what is an anomalous result?

Answer 17

a result that doesnt fit into the rest of the results, an off one out