equations 😟

Question 1

ADD ALL EQUATIONS HERE 😘

Answer 1

Yass

Question 2

(Add more) 🟡🟡
What is m1 x v1 = m2 x v2
(Finding v1 usually)

Answer 2

Concentration of orig sol. x vol of orig sol.
=
Conc by end (TOTAL) x vol by end (TOTAL)

10 represents m1 (unless otherwise)
The (eg. 5ml) solution is v2
Final conc is on table

Question 3

How do we use a calibration curve

Answer 3

1. Make different known sugar concentrations
2. Use colorimeter to measure absorbance/transmission
   Of each conc and plot cal curve on graph
3. Find conc of sample from calibration curve

Question 4

How to find uncertainties

Answer 4

Amount of uncertainty is
+/- half the smallest division on the scale measuring with

Eg. Smallest division is 5ml
+/- 2.5 ml
80ml +/- 2.5

…

With 2 or more uncertainties
1. Find all uncertainties
2. Add measured volumes
3. Add to get combined uncertainty
4. Combine answers from last 2 steps to get the total volume and uncertainty
NEEDED SAME UNITS

Question 5

How to work out percentage error

Answer 5

(Uncertainty/ measured value) x100

Question 6

How to describe using a calibration curve to find unknowns

Answer 6

• make different known sugar concentrations
• use colorimeter to measure absorbance of each conc
• plot calibration curve on graph
• find conc of sample from using curve

Question 7

Mitotic index

Answer 7

( Cells in mitosis / total cell no. ) x 100
= percentage of cells undergoing mitosis

Question 8

Why do we use percentages

Answer 8

Allows comparisons between different starting values

Question 9

What to put for evaluating questions (studies)

Answer 9

+ tends to be data fitting pattern (quote)

• no control
• untruthful/subjective response
• some data not fitting pattern(quote)
• done in animals not humans
• small sample is unrepresentative
• one group (eg. Male)
• correlation not causation