# IPS Exam Experience

## Lab Safety

• nurse number: 2828
• use common sense
• always keep goggles on and hair up
• safety equipment: fire extinguisher, fire blanket, eye wash/shower
• NEVER waft solids/powders--ALWAYS waft liquids
• hot and cold glass look the same
• NEVER add water to acid--would cause an exothermic reaction (creates heat)
• acid MUST be added to water

## Scientific Method

1. Identify problem
2. Gather information
3. Form hypothesis/theory
4. Test theory--Experiment
5. Analyze data
6. Conclusion

## Reaction in a Bag

• an exothermic reaction occurred--created heat
• reaction produced a gas, which caused bag's pressure to increase

Scholar Reaction In The Bag Inquiry Demonstration and Lab Activity

## Chapter 1 Vocabulary

observation

inference

hypothesis

control group

experimental group

control factors

indicator

volume

volume displacement technique

mass

meniscus

## 1.1 Baking Soda Lab

• baking soda: sodium bicarbonate
• control group: unheated baking soda and tea
• experimental group: heated baking soda and tea
• indicator: tea
• condensation formed because hot air touches cooler surface and goes from gas back to liquid

Lab 1.1 Heating Baking Soda

## 1.2 Volume Notes

• cubic centimeter: cm3
• 1 centimeter=0.01 m
• use a graduated cylinder to measure volume
• 1 mL= 1 cm3
• 2.2 kg=1 lb

## Single Pan Balance Notes

• check that pan is clean and dry
• always "zero: balance before massing
• NEVER switch pans
• pick up balance by red bar only

## 1.4 Measuring Volume by Displacement of Water Lab

• lab groups were instructed to use different amounts of sand because it was to show that no matter what amount of sand there is, the air space and percentages will be really close
• experimental error: sand sticks to side of cylinder (v. of sand would decrease)
• experimental error: read sand level NOT H20 level (numbers would be weird)
• experimental error: water splashes out when sand is poured
Lab 1-4 Measuring Volume By Displacement

## 1.8 Sensitivity of a Balance Lab

• margin of error that your balance gives when you mass an object
Lab 1-8 TBB.m4v

## Chapter 2 Vocabulary

histogram

conservation of mass

laws of nature

## 2.1 Mass of Dissolved Salt Lab

• all errors lead to a decrease in mass
• everyone's change in masses are different bc of different balances and experimental errors
• experimental error: cleaning the pan between the Mi and the Mf
• experimental error: cap is not tight (H20 leaves)
• salt spilt when pouring salt from cap into the bottle
• outside of the bottle is wet
Lab 2-1 Mass of Dissolved Salt

## 2.4 Mass of Ice and Water Lab

• condensation forms when warm water vapor touches the cool bottle (changes from a gas to a liquid)
• experimental error-