Basics of Science Quiz 1 Review

I want to know if low strength bleach, medium strength bleach, or maximum strength bleach will get ketchup stains out of white T-shirts the best. What is the independent variable in this experiment?

• the type of stain

• the strength of the bleach

• how much of the stain was removed

• the brand of ketchup

I want to know if low strength bleach, medium strength bleach, or maximum strength bleach will get ketchup stains out of white T-shirts the best. Mark all answers that are correct.

• I should use the same brands of bleach and of ketchup and the same temperature of water for each test. These are called constants.

• The strength of the bleach is the dependent variable

• It's OK to use different washing machines or types of detergent for each test so I can gather data more quickly.

• If I washed some shirts with no bleach that would be a control group

How many independent variables should you have in an experiment?

• two

• as many as possible

• four

• one

The trees outside of the school have large, green leaves growing on them. Is this a Qualitative Observation, Quantitative Observation, or an Inference

• Qualitative Observation

• Quantitative Observation

• Inference

Mr. Wells is probably not in school today because his is sick. Is this a Qualitative Observation, Quantitative Observation, or an Inference

• Qualitative Observation

• Quantitative Observation

• Inference

The plastic bottle holds two liters of soda. Is this a Qualitative Observation, Quantitative Observation, or an Inference

• Qualitative Observation

• Quantitative Observation

• Inference

Which is true about the scientific method? Mark all that are correct.

• Experiments should be done several times on a large number of samples.

• It's OK if you can only do the experiment once. The data should be good enough if it was done carefully.

• The steps must be done in a certain order

• Sometimes the scientist has to go back and start over or change how they are doing things

• Scientists will communicate their results

Which of the following statements is an inference about the picture?

• The vase is broken.
• The girls' bow is blue and purple.
• The girl broke the vase.
• The girl has blonde hair.

Mark all statements that are an observation about this picture.

• The man is scared
• There is a large shark swimming in the water

• There is a man in a kayak
• The man is paddling fast

_{The sailboat belongs to the boy.}

• inference
• observation