Scientific endeavour

Question 1

Hypothesis

Answer 1

Statement of a prediction; written before a experiment

Question 2

Independent Variable

Answer 2

changed variable

Question 3

Dependent variable

Answer 3

Measured variable

Question 4

Controlled variable

Answer 4

Constant variable

Question 5

Bunsen Burner

Answer 5

Heat substances

Question 6

Tripod stand

Answer 6

A support for the substance places one top of the Bunsen burner flame

Question 7

Test tube (smaller than a boiling tube)

Answer 7

Small amount of substances for heating or mixing

Question 8

Measuring tube

Answer 8

Measures volumes of liquids; various capacities; precision of 0.5ml

Question 9

Boiling tube

Answer 9

(Bigger than test tube) simple reactions can be carried out involving heating

Question 10

Burette

Answer 10

For dispensing substances in PRECISE volumes

Question 11

Gas jar

Answer 11

Contains gases smallest division up to 0.10 m3 (measures up to hundredths)

Question 12

Pipette

Answer 12

Measures accurately fixed volumes of liquids; various capacities, to precision

Question 13

Precautions to be taken when doing measurements

Answer 13

1. Eye level should be positioned vertically (90 degrees), when reading measurement
2. To avoid parallax error which is the error in reading due to incorrect positioning of eyes

Question 14

Steps with using a vernier caliper

Answer 14

1. Place the object between the jaws firmly
2. Read the main scale + the zero mark one the vernier scale
3. Read the vernier scale
4. Add the main scale and the vernier scale (find diameter)

Question 15

Measuring volume: measuring cylinder

Answer 15

Precision of 0.5cm3 or 0.5m

Question 16

measuring volume: Beaker

Answer 16

Not precise for measuring volume

Question 17

Measuring volume: Syringe

Answer 17

Has a meniscus

Question 18

Measuring volume: Pipette

Answer 18

Draws liquid up: Measures up specific volumes
Let liquid flow out: measures amount dispersed (0.10ml)