Lab Safety/Lab Equipment/Scientific Method

A triple beam balance is used for_______________.

• to find the volume of liquids

• to find the mass of small objects not exceeding 610 grams.

• to find the length of an object

• to find the temperature

1. A graduated cylinder is used to measure _________ in milliliters and is shaped like a narrow tube. It measures with more _______ than a beaker.

• mass, errors

• length, volume

• liquid volume, accurate

• liquid volume, and accurate

A petri dish is used for:

• culturing different types of cells, including bacteria. It grows on some kind of nutrient medium (broth, agarose gel).

• finding the mass of objects

• magnifying objects

• finding the volume of objects

Tags

NGSS.MS-LS1-1

A microscope is used for:

• finding the mass of objects in grams

• finding the liquid volume of objects in milliliters

• magnifying small or microscopic organisms, or objects, such as bacteria.

• finding the temperature

1. Which of the following is not a step in the scientific method?

• form a hypothesis

• form a theory

• make an observation

• collect and analyze data

1. In an experiment, the variable being deliberately changed or manipulated is called the

• dependent variable

• control variable

• none of these are variables

• independent variable

Tags

NGSS.MS-PS2-2

How many variables can there be in a controlled experiment (how many is tested at one time)?

• 5

• 3

• 1

• 2

Which of the following lab safety rules is Evan breaking?

• No goggles

• he is breaking all of these rules

• drinking from glassware

• no apron

Follow all ________ and _________ instructions and directions carefully.

• written , verbal

• written, interesting

• written, documented

• None of these are the correct answer

Which of the following is not a safe practice?

• Report minor accidents to your lab supervisor and/or teacher.

• Keep chemicals, glassware, and other equipment away from the edge of the lab table

• After removing glassware from a heat source, touch it right away to see if it is cool.

• Carefully heat chemicals in a flask with teacher supervision.