Scientific Inquiry
Which one is the BEST example of a good scientific question?
a. What is your favorite time of day?
b. Which is the fastest growing tree on Earth?
c. Do people need air to stay alive?
d. Which car is the most fuel efficient?
d. Which car is the most fuel efficient?
Identify 3 situations when safety goggles should be worn.
You should wear goggles when you are working with any type of chemical, using heat or fire, and when using sharp objects.
Describe 2 similarities and differences of a fire extinguisher and a fire blanket
A fire extinguisher contains chemicals under pressure and should never be sprayed on a person. A fire blanket is made of wool or fiberglass and can be wrapped around a person to smother a flame.
Which of the following statements best describe replication in an experiment
a. Doing many trials in your experiment
b. Other scientists doing your experiment using your procedure
c. Doing many different experiments about the same topic
d. Sharing your results with many different groups
b. Other scientists doing your experiment using your procedure
Accuracy - From the table below, which student's measurements are the most accurate?
Melting Point of Aspirin (ACCEPTED VALUE: 135°C) | ||||
| Student R | Student S | Student T | Student U |
Trial 1 | 133.7°C | 134.6°C | 134.8°C | 133.9°C |
Trial 2 | 133.4°C | 135.5°C | 134.5°C | 135.0°C |
Trial 3 | 133.9°C | 136.1°C | 135.3°C | 134.5°C |
Average | 133.7°C | 135.4°C | 134.9°C | 134.5°C |
Student T
Identify the independent, dependent, and controlled variables. Does fertilizer make a plant grow taller?
Controlled – soil type, pot size, water amount, plant type;
Dependent – growth of the plant measured by its height;
Independent – amount of fertilizer
List three reasons why it is important to follow the lab safety procedures?
The lab can be a hazardous area if the rules and procedures are ignored. Following the procedures correctly will ensure:
1. my safety
2. the safety of all others
3. safety of equipment
Identify a situation when a graduated cylinder would be used instead of a beaker
A graduated cylinder would be needed when you have to find a very accurate and precise volume of a certain liquid. A graduated cylinder allows you to be much more precise than a beaker
Which of the following statements best describe repetition in an experiment?
a. Doing many trials in your experiment
b. Doing many different experiments about the same topic
c. Sharing your results with many different people
d. Having other scientists do your experiment
a. Doing many trials in your experiment
Which student's measurements are the most precise?
Melting Point of Aspirin (ACCEPTED VALUE: 135°C) | ||||
| Student R | Student S | Student T | Student U |
Trial 1 | 133.7°C | 134.6°C | 134.8°C | 133.9°C |
Trial 2 | 133.4°C | 135.5°C | 134.5°C | 135.0°C |
Trial 3 | 133.9°C | 136.1°C | 135.3°C | 134.5°C |
Average | 133.7°C | 135.4°C | 134.9°C | 134.5°C |
Student R
The way scientists go about asking and answering their questions is called
a. data
b. observation
c. scientific inquiry
d. scientific knowledge
c. scientific inquiry
The name of a chamber in a chemist's lab that keeps fumes and dangerous and harmful chemicals from escaping into the lab
Fume Hood
Describe the use of the beaker, graduated cylinder and the triple beam balance
Beaker – it is needed to hold or heat liquids for lab investigations
Graduated Cylinder – it is needed to precisely measure the volume of liquids during a lab
Triple Beam Balance – it is needed to precisely measure mass during a lab
Which of the following two statements are true of a controlled experiment?
a. It tests only one variable at a time
b. Many variables can be changed as wanted
c. The dependent variable is the variable that is changed
d. The independent variable is the variable that is changed
a. It tests only one variable at a time
d. The independent variable is the variable that is changed
By what description do the following kinds of measurements go?
meter
mole
second
SI Base Units
How many experimental groups were included in the experiment shown in the table below?
Plant Group | Micrograms of Plant Hormones in Plant’s Water | Average Height (cm) |
1 | 0.0 | 20 |
2 | 0.05 | 40 |
3 | 0.1 | 60 |
4 | 0.25 | 70 |
5 | 0.5 | 75 |
6 | 1.0 | 80 |
7 | 2.0 | 80 |
6
When smelling any chemical or substance, ONLY when instructed to do so, you do so by ___________.
Wafting
Identify 3 pieces of lab equipment that are used for measuring and what they are used to measure
Meter stick – measures length
Triple beam balance – measures mass
Spring scale – measures force
Graduated cylinder - measures volume
Thermometer - measures temperature
You learned that a student in your class earned a perfect score on her test. Based on this information, you figure that your classmate took good notes and studied for a long time. This guess is an example of which of the following?
a. an inference
b. a fact
c. an observation
d. an opinion
a. an inference
An inference is a conclusion based on knowledge and evidence. They are not the same as actual observation and can be wrong and vary from person to person
The expression of error as a percentage of the accepted value is ___________
percent error
Which statement represents the way that scientists may make scientific inquiry?
a. A scientist makes a prediction, makes an observation, and then asks a scientific question
b. A scientist makes an observation, makes a prediction, and then asks a scientific question
c. A scientist asks a scientific question, makes a prediction, and then makes observations
d. A scientist makes an observation, asks a scientific question, and then makes a prediction
d. A scientist makes an observation, asks a scientific question, and then makes a prediction
This is how you hold the test tube during heating in the lab
Away from you and other people
Identify at least three lab tools and equipment needed in the scenario below.
During a lab, you must closely observe samples of rocks and minerals and then calculate the density of each sample.
Lab Tools and Equipment Needed:
1.Hand lens for observing the rocks and minerals
2.Graduated cylinder for finding the volume of each sample
3.Triple beam balance or electronic scale for finding the mass of each sample
You set up an experiment to see how sunlight affects plant growth. You give two similar plants the same amount of water everyday, but you put one plant in sunlight and the other plant in shade. Which of the following should be a controlled variable in this experiment?
a. age of the investigators
b. amount of water given to each plant
c. amount of sunlight
d. plant growth
c. amount of sunlight
A spoken or written summary of observations is a(n) ___________, while a(n) ____________ is an interpretation of observations
description, explanation