the scientific endeavour

Question 1

what is qualitative data?

Answer 1

using 5 senses to make observations

Question 2

what is quantitative data?

Answer 2

measuring using numerical quantities

Question 3

what is a hypothesis?

Answer 3

a proposed explanation for an observation

Question 4

what are the three types of variables?

Answer 4

the independent variable, dependent variable, and control

Question 5

what is an independent variable?

Answer 5

the variable changed in an experiment

Question 6

what is a dependent variable?

Answer 6

the variable observed or measured

Question 7

what is a control

Answer 7

the variable that is being kept constant

Question 8

the SI unit for volume?

Answer 8

m^3

Question 9

the SI unit for mass?

Answer 9

kg

Question 10

the SI unit for time?

Answer 10

s

Question 11

the SI unit for length?

Answer 11

m

Question 12

the SI unit for temperature?

Answer 12

K

Question 13

what is zero error?

Answer 13

an instrument gives a non-zero reading when the measured quantity should be zero

Question 14

how to remove zero-error?

Answer 14

some instruments have the “tare” function that can reset the scale

Question 15

what is parallax error?

Answer 15

when the marking on the instrument is viewed form the wrong angle

Question 16

how do you properly read a ruler?

Answer 16

line of sight it perpendicular to the marking on the ruler

Question 17

how do you properly read a measuring cylinder?

Answer 17

line of sight is level with the bottom of the meniscus (curved surface of the liquid)

Question 18

how do you properly read a spring balance?

Answer 18

line of sight is perpendicular to the marking on the scale

Question 19

how do you properly read a thermometer?

Answer 19

line of sight is level with the top of the meniscus

Question 20

describe the corrosive symbol

Answer 20

chemicals being poured onto a hand and another material

Question 21

what does corrosives do?

Answer 21

cause severe damage on contact with body parts

Question 22

describe the irritant symbol

Answer 22

an exclamation mark

Question 23

what does irritants do

Answer 23

lead to irritation, allergic reactions or inflammation of the skin, eyes, nose or respiratory system. may cause drowsiness and dizziness. has harmful health effects. can cause harm to ozone layer.

Question 24

describe the environmental toxicity symbol

Answer 24

dying tree and fish

Question 25

what does environmental toxicity do

Answer 25

cause harmful effects on the environment

Question 26

describe the oxidising substance symbol

Answer 26

ball on fire

Question 27

what does oxidising substance do

Answer 27

release oxygen easily which can cause fire and/or explosion

Question 28

describe the gasses under pressure symbol

Answer 28

a beer bottle

Question 29

what does gasses under pressure do

Answer 29

may explode when heated. may cause oxygen deficiency if gas is leaked in an enclosed space

Question 30

describe the acute toxicity symbol

Answer 30

skull

Question 31

what does acute toxicity do

Answer 31

cause toxic or harmful effects to body when breathed, swallowed, or on contact with skin. degree of exposure and toxicity can affect level of health implications. may be fatal