Chemistry Mid-Unit Review

Which of the following is a safety violation in the lab?

• Reading all lab directions

• Eating and drinking in the lab

• Keeping a clean lab station

• Notifying teacher of broken glassware

Which of the following is the safety equipment to use if you get something from a lab in your eyes?

• Fire extinguisher

• Fire blanket

• Apron

• Eye-wash

Which of the following is a safe practice in the lab?

• Wafting to smell a substance

• Horseplay

• Making up your own lab and doing it without asking the teacher

• Leaving the lab station without cleaning it because the bell rang

Which of the following is the safety equipment that you would use if someone's clothes caught on fire?

• Safety googles

• Eye-wash

• Fire blanket

• Apron

Which of the following is a qualitative observation?

• There are 5 mealworms.

• Mealworm #1 was 3.4 cm long.

• Mealworms have a head with antennae.

• Mealworms have 7 legs.

Which of the following is a quantitative observation?

• The fidget spinner is gold with red, blue and green on wings.

• The fidget spinner has removable wings.

• The fidget spinner has 6 wings.

• The fidget spinner has cylindrical wings.

What is the difference between an observation and an inference?

• An inference is a fact and an observation is an opinion.

• An observation is a fact and an inference is an opinion.

• An observation and an inference are the same thing, no difference.

• You never make observations in labs, only inferences.

Which of the following is an inference?

• The boys were playing football in the lab before dueling.

• There is a hamburger on the lab table.

• The girl is wearing goggles.

• There are 2 flasks with green and yellow liquids on the lab table.

Which step in the scientific method is the educated guess?

• Asking a question or defining the problem

• Research

• Writing the hypothesis that includes the independent and dependent variables

• Writing the conclusion

A student wanted to know if caffeine affects appetite. What would be the independent variable?

• Drinking fluids with no caffeine 30 minutes before a meal

• Drinking fluids with caffeine 30 minutes before a meal

• How hungry test subjects are when it is time for the meal

• Amount of caffeinated liquid