TAKS REVIEWTAKS REVIEW

Hildebrandt IntermediateHildebrandt Intermediate

Lab Safety RulesLab Safety Rules If you have long hair, pull it away from your face or put in a If you have long hair, pull it away from your face or put in a

ponytail.ponytail. Do not put your face or hands over any boiling liquid. Never point a container at yourself or anyone else while it is being

heated. Always cut away from your body and others. Dispose of all chemicals and used materials in their designated

containers, do not assume that everything goes in the garbage or down the drain.

If you come in contact with a chemical or you are injured, notify the teacher immediately.

When in doubt, notify your teacher. Always add acids and bases to water NOT the other way around.

What’s wrong? Identify 6 different safety concerns shown in the picture below.

Image: http://morrisonlabs.com/lab_safety.htm

The answers are …

Image: http://morrisonlabs.com/lab_safety.htm

Don’t eat or drink while in the lab.

Don’t fool around during a lab.

Always wear safety goggles when doing

an experiment

Always point test tubes and other items away from yourself and

others when heating.

Keep hair and other flammable objects away from flames.

Don’t leave a flame unattended.

What’s wrong? Identify 9 different safety concerns shown in the picture below.

Image: http://morrisonlabs.com/lab_safety.htm

The answers are …

Image: http://morrisonlabs.com/lab_safety.htm

Always wear safety goggles during a lab.

Don’t leave materials laying

on the floor.

Clean up spills immediately

Don’t heat closed containers.

Keep your lab area neat and clean.

Unplug equipment when not in use.

Don’t place lab materials near the edge of the table.

Keep papers and other flammable objects away

from flames.

Don’t smell directly from a container - WAFT.

Scientific MethodScientific Method Question – “Will ________ affect __________”? Hypothesis – “If I do this, then this will happen.” Variables

Independent – What did I change? Dependent – What am I recording? Data Controlled – What did I keep the same? No Change

Materials – Items you used to conduct experiment. Procedure – What did you do? The steps of the experiment.

Like a recipe. Data – Collection of information in forms of charts and

graphs. Conclusion – Summation of whether or not your hypothesis

was proven (correct) or disproven (incorrect).

Read the information below and then answer the questions.

SpongeBob and Patrick love to go jellyfishing. They wondered if a new brand of jellyfish bait would help them catch more jellyfish. To test their idea, they bought a big container of bait for their next 3 trips to their top-secret fishing spot. SpongeBob fished without any bait, while Patrick used the new bait. Both of them kept track of how many jellyfish they caught in 30 minutes, which is shown in the chart.

1. Which person was the control?

2. What is the independent variable?

3. What is the dependent variable?

4. Based on the data, how would you rate the new bait?

SpongeBobSpongeBob PatrickPatrick

2525 2424

1818 2828

2626 1919

Read the information below and then answer the questions.

SpongeBob and Patrick love to go jellyfishing. They wondered if a new brand of jellyfish bait would help them catch more jellyfish. To test their idea, they bought a big container of bait for their next 3 trips to their top-secret fishing spot. SpongeBob fished without any bait, while Patrick used the new bait. Both of them kept track of how many jellyfish they caught in 30 minutes, which is shown in the chart.

1. Which person was the control?

2. What is the independent variable?

3. What is the dependent variable?

4. Based on the data, how would you rate the new bait?

SpongeBobSpongeBob PatrickPatrick

2525 2424

1818 2828

2626 1919

SpongeBob

Jellyfish Bait

Number of jellyfish caught

The bait appears to have helped a small amount, but shouldn’t be rated as a great deal. Overall Patrick caught 2 more jellyfish than SpongeBob.

Read the information below and then answer the questions.

SpongeBob loves to grow flowers for his pal Sandy, who loves big, colorful flowers. He found a new brand of seeds coated with a special “booster” fertilizer that said it would produce huge flowers. He planted 5 of the new seeds in one container and 5 of the old brand of seeds in another container. He placed both containers on a sunny windowsill and watered them every day. He measured the diameter of each flower, which is shown in the chart.

1. Which group was the control?

2. What is the independent variable?

3. What is the dependent variable?

4. What is the average diameter for each group?

Old SeedsOld Seeds 10 cm10 cm 12 cm12 cm 14 cm14 cm 6 cm6 cm 8 cm8 cm

New SeedsNew Seeds 8 cm8 cm 14 cm14 cm 10 cm10 cm 12 cm12 cm 16 cm16 cm

5. Which seeds are the best for big flowers?

Read the information below and then answer the questions.

SpongeBob loves to grow flowers for his pal Sandy, who loves big, colorful flowers. He found a new brand of seeds coated with a special “booster” fertilizer that said it would produce huge flowers. He planted 5 of the new seeds in one container and 5 of the old brand of seeds in another container. He placed both containers on a sunny windowsill and watered them every day. He measured the diameter of each flower, which is shown in the chart.

1. Which group was the control?

2. What is the independent variable?

3. What is the dependent variable?

4. What is the average diameter for each group?

Old SeedsOld Seeds 10 cm10 cm 12 cm12 cm 14 cm14 cm 6 cm6 cm 8 cm8 cm

New SeedsNew Seeds 8 cm8 cm 14 cm14 cm 10 cm10 cm 12 cm12 cm 16 cm16 cm

5. Which seeds are the best for big flowers?

The seeds without the booster fertilizer

Booster fertilizer on the new seeds

Size or diameter of the flower

Old = 10 cm, New = 12 cm

New seeds w/ the booster

InferencesInferences

An inference is an explanation based on An inference is an explanation based on prior knowledge and experience.prior knowledge and experience.

When you drop a ball, what does it do?When you drop a ball, what does it do? It bounces of course.It bounces of course.

Types of GraphsTypes of Graphs

Pie Charts

• Show parts over whole

• Show percentages

Line Graph

• Show change over time

Bar Graph

• Show comparison of multiple items

Which Graph?Which Graph?

Which graph is a good choice when you are Which graph is a good choice when you are talking about pieces that make a whole?talking about pieces that make a whole?

Pie chartPie chart Which graph is a good choice when you need to Which graph is a good choice when you need to

compare different items?compare different items? Bar graphBar graph Which graph is a good choice when different Which graph is a good choice when different

measurements of the same item are recorded measurements of the same item are recorded over time?over time?

Line graphLine graph

Graph MeasurementsGraph Measurements Percent – shows parts to a wholePercent – shows parts to a whole What percent is one half?What percent is one half? What percent is six eighths?What percent is six eighths? Average – 1. add up all the numbersAverage – 1. add up all the numbers 2. divide the sum by the number 2. divide the sum by the number

of addends of addends What is the average of 2.3, 2.78, and 3.44?What is the average of 2.3, 2.78, and 3.44? First add (line up all the decimals) = 8.22First add (line up all the decimals) = 8.22 Next divide 8.22 by 3 (you added three numbers Next divide 8.22 by 3 (you added three numbers

together) = 2. 74together) = 2. 74

Graph MeasurementsGraph Measurements

Range – difference between the largest Range – difference between the largest and smallest numbersand smallest numbers

Difference tells you to subtractDifference tells you to subtractWhat is the range of 4 through 10?What is the range of 4 through 10?10 – 4 = 610 – 4 = 6What is the range of 9.78 through 4.56?What is the range of 9.78 through 4.56?9.78 – 4.56 = 5.229.78 – 4.56 = 5.22

Graph MeasurementsGraph Measurements

Frequency – is how often something Frequency – is how often something occursoccurs

In 10 seconds, how many times can you In 10 seconds, how many times can you say this phrase?say this phrase?

Susie sells sea shells by the sea shore.Susie sells sea shells by the sea shore.

GraphsGraphs What kind of graph would you

use to show this information? line graph What variable goes on the X

axis? water depth (in meters) What variable goes on the Y

axis? temperature in degrees

Celsius DRY (dependent – y axis) MIX (independent – x axis)

GraphsGraphs

Based on this information, what happens to the water temperature as the ocean depth increases?

ModelsModels Have you ever built a model car?Have you ever built a model car? Is it actual size?Is it actual size? A model is a good representation of the actual A model is a good representation of the actual

object, but on a smaller scale.object, but on a smaller scale. Models have their limitations.Models have their limitations. Can we make a life size replica of our solar Can we make a life size replica of our solar

system?system? We can make a model of our solar system, but a We can make a model of our solar system, but a

life size replica would not be possible.life size replica would not be possible. What are some limitations of using an apple to What are some limitations of using an apple to

represent the Earth?represent the Earth?

EquipmentEquipment

Which instrument could be used to Which instrument could be used to determine the volume of an irregularly determine the volume of an irregularly shaped solid? shaped solid?

Graduated cylinderGraduated cylinder

EquipmentEquipment

Mrs. Koch needs to measure the density Mrs. Koch needs to measure the density of a regular shaped object. What of a regular shaped object. What equipment is needed to complete this lab?equipment is needed to complete this lab?

Triple beam balance (grams = mass)Triple beam balance (grams = mass)Ruler (cubic centimeters = cm3) orRuler (cubic centimeters = cm3) orGraduated cylinder (milliliters = mL)Graduated cylinder (milliliters = mL)

EquipmentEquipment

Mrs. Clark is a fast runner. Mrs. Meyer Mrs. Clark is a fast runner. Mrs. Meyer decides that the class should calculate her decides that the class should calculate her actual speed. What pieces of equipment actual speed. What pieces of equipment would be needed to complete this would be needed to complete this experiment?experiment?

Stop watch (calculate time)Stop watch (calculate time)Meter sticks (measure distance)Meter sticks (measure distance)

EquipmentEquipment

Mrs. Crannie’s classes need to study the Mrs. Crannie’s classes need to study the water in the local pond. What pieces of water in the local pond. What pieces of equipment would be needed to study what equipment would be needed to study what organisms actually live in the water?organisms actually live in the water?

Beaker – to collect pond water samplesBeaker – to collect pond water samplesDropper – to get a small sampleDropper – to get a small sampleMicroscope slide – to place sample onMicroscope slide – to place sample onMicroscope – to examine the sampleMicroscope – to examine the sample

EquipmentEquipment

Students were instructed to heat a small Students were instructed to heat a small sample of liquid in a container. What sample of liquid in a container. What pieces of equipment would be needed to pieces of equipment would be needed to conduct this experiment?conduct this experiment?

Test tubesTest tubesTest tube holderTest tube holderBunsen burnerBunsen burnerSafety gogglesSafety goggles

Safety EquipmentSafety Equipment

What piece of equipment is shown?What piece of equipment is shown?

Safety EquipmentSafety Equipment

What piece of safety equipment is shown?What piece of safety equipment is shown?

Safety EquipmentSafety Equipment

What piece of safety equipment is shown?What piece of safety equipment is shown?

Safety EquipmentSafety Equipment

What piece of safety equipment is shown?What piece of safety equipment is shown?

Unit of MeasurementUnit of Measurement

What unit do we use to measure mass?What unit do we use to measure mass?GramsGramsWhat unit do we use to measure liquid What unit do we use to measure liquid

volume?volume?LitersLitersWhat unit do we use to measure length?What unit do we use to measure length?metersmeters

What is the major landform shown on the topographicMap below?

What is the contour interval on this map?

The closed terrarium models a plant ecosystem. The plantCannot survive over a long period of time in this terrariumBecause it limits the growth of the plant. What factor will most limit the plants growth?

A.A decrease in carbon dioxide

B.Decrease in oxygen

C.Evaporation of water

D.Lack of sunlight

The student is digging to collect soil samples.What is the least important safety practice

for this activity?

A. Wearing goggles

B. Wearing close-toed shoes

C. Knowing where the shovel is

D.Removing jewelry

The two images are view of the same salt crystals undera microscope. Which action would most likely cause thedifference in size of the individual salt grains betweenthe two views?

A. Switching the objective lens

B. Adjusting the diaphragm

C. Turning the fine adjustment knob

D. Changing the angle of the light source

Match the pieces of equipment needed to do each job listed:

1. Heating a mixture of two liquids

2. Examining a sample of pond water under a microscope