Transcript Slide 1

Equipment and Safety
1. Bunsen Burner
2. Beaker
3. Tongs
4. Erlenmeyer Flask
5. Evaporating Dish
6. Graduated Cylinder
7. Iron Ring
8. Mortar and Pestle
9.Test Tube
10. Buret
11.Volumetric Flask
12. Watch Glass
Equipment and Safety
13. You should always first flush the effected area
with water.
14. Graduated cylinder
15. (theoretical-experimental) / theoretical x 100
experimental / theoretical x 100
16. Accuracy– how close to the actual answer
Precision – how close answers are to each
other
Tips for significant figures
All numbers (1-9) are significant
For zeros, remember the two questions:
1.
2.
1.
2.
•
•
3.
4.
Is there a decimal point?
Is there a number (besides zero) anywhere
in front of the zero?
If yes to both – significant
If no to either – not significant
When adding, look at the decimal place
When multiplying, look at the least
number of significant figures.
Equipment and Safety
a. 560.5
b. 700
c. 79032
d. 0.0004820
e. 0.005040300
4
1
5
4
7
a. 56.70 + 1.201
b. 12.3 x 4.5
c. 110/2.55
d. 771 – 1.5
e. 156.6/2.0
57.90 (to hundredths)
55 (to 2 sig figs)
43 (to 2 sig figs)
769 or 770. (to ones place)
78 (to 2 sig figs)
Equipment and Safety
19 a. 0.250 L
b. 0.013 km
c. 100 mm