Lab Safety and Scientific Method Unit Test

Mae B Knott wanted to be a doctor someday. She heard that washing your hands more often reduces the number of colds a person might get. She decided to do an experiment to find out if what she heard was true.

Four classes participated in the experiment. The experiment was set up as follows:

Class 1: Did NOT wash hands at all.

Class 2: Washed hands once per day.

Class 3: Washed hands 4 times per day.

Class 4: Washed hands 8 times per day.

During the experiment, the number of colds were recorded.

The experimental group(s) for this experiment would include

• students that do NOT wash their hands

• students that wash their hands 1, 4 and 8 time(s) each day

• students with colds

• students without colds

Mae B Knott wanted to be a doctor someday. She heard that washing your hands more often reduces the number of colds a person might get. She decided to do an experiment to find out if what she heard was true.

Four classes participated in the experiment. The experiment was set up as follows:

Class 1: Did NOT wash hands at all.

Class 2: Washed hands once per day.

Class 3: Washed hands 4 times per day.

Class 4: Washed hands 8 times per day.

During the experiment, the number of colds were recorded.

What is the best question for Mae to investigate?

• Do the number of colds affect the amount of vitamins taken?

• Do students who wash their hands 8 times each day do better than students who don't wash their hands?

• Does the amount of hand washing affect the number of colds a student gets?

• Do the number of colds depend on the type of soap used?

Mae B Knott wanted to be a doctor someday. She heard that washing your hands more often reduces the number of colds a person might get. She decided to do an experiment to find out if what she heard was true.

Four classes participated in the experiment. The experiment was set up as follows:

Class 1: Did NOT wash hands at all.

Class 2: Washed hands once per day.

Class 3: Washed hands 4 times per day.

Class 4: Washed hands 8 times per day.

During the experiment, the number of colds were recorded.

What would be a testable hypothesis for Mae to investigate?

• Students get colds because they don't use the right brand of soap.

• Students will get fewer colds if they use bar soap instead of liquid soap.

• I think the amount of hand washing does affect the number of colds.

• Students who wash their hands will feel better than those that don't.

Mae B Knott wanted to be a doctor someday. She heard that washing your hands more often reduces the number of colds a person might get. She decided to do an experiment to find out if what she heard was true.

Four classes participated in the experiment. The experiment was set up as follows:

Class 1: Did NOT wash hands at all.

Class 2: Washed hands once per day.

Class 3: Washed hands 4 times per day.

Class 4: Washed hands 8 times per day.

During the experiment, the number of colds were recorded.

The most appropriate control group for the experiment would be

• students that do NOT wash their hands

• students that wash their hands 1, 4, and 8 time(s) each day

• students with colds

• students without colds

Mae B Knott wanted to be a doctor someday. She heard that washing your hands more often reduces the number of colds a person might get. She decided to do an experiment to find out if what she heard was true.

Four classes participated in the experiment. The experiment was set up as follows:

Class 1: Did NOT wash hands at all.

Class 2: Washed hands once per day.

Class 3: Washed hands 4 times per day.

Class 4: Washed hands 8 times per day.

During the experiment, the number of colds were recorded.

What is the dependent variable?

• type of soap

• number of colds

• hand washing method

• amount of hand washing

Mae B Knott wanted to be a doctor someday. She heard that washing your hands more often reduces the number of colds a person might get. She decided to do an experiment to find out if what she heard was true.

Four classes participated in the experiment. The experiment was set up as follows:

Class 1: Did NOT wash hands at all.

Class 2: Washed hands once per day.

Class 3: Washed hands 4 times per day.

Class 4: Washed hands 8 times per day.

During the experiment, the number of colds were recorded.

What is the independent variable?

• type of soap

• number of classes

• number of colds

• amount of hand washing

Kevin wasn’t paying attention as the teacher was explaining where safety equipment is found and how it is used. While he finished his cookie from lunch he thought to himself, “I’ll never need to know this stuff.”

Which rules were broken?

• No chemicals should leave the lab class AND goggles must be worn when working with chemicals.

• Students should point heated substances away from others AND students are responsible for knowing where safety equipment is located.

• Goggles must be worn when working with chemicals AND students should point heated substances away from others.

• Students are responsible for knowing where safety equipment is located AND food, drink and gum are not allowed in the lab.

If the bell rings at the end of the hour it is okay to leave your lab station without cleaning it so that you are not late for your next class.

• True

• False

Nathan was messing around during a lab instead of following the proper procedures and he broke some glassware. He tried to clean it up before the teacher could see what happened and he cut his finger.

Which rules were broken?

• Horse play, practical jokes, and pranks are not allowed in a lab and food, drink and gum are not allowed in the lab.

• Food, drink and gum are not allowed in the lab and students should dispose of chemicals according to teacher directions.

• Horse play, practical jokes, and pranks are not allowed in a lab and students should never handle broken glassware with bare hands.

• Students should dispose of chemicals according to teacher directions and never use or heat chipped or cracked glassware.

The symbol shown means that...

• wearing goggles is optional for this lab.

• people who wear glasses cannot do this lab.

• wearing goggles is required for this lab.

• you should wear your contacts for this lab.